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
  63 static inline bool kvaser_is_leaf(const struct usb_device_id *id)
  64 {
  65         return id->idProduct >= USB_LEAF_DEVEL_PRODUCT_ID &&
  66                id->idProduct <= USB_MINI_PCIE_HS_PRODUCT_ID;
  67 }
  68
  69 /* Kvaser USBCan-II devices */
  70 #define USB_USBCAN_REVB_PRODUCT_ID      2
  71 #define USB_VCI2_PRODUCT_ID             3
  72 #define USB_USBCAN2_PRODUCT_ID          4
  73 #define USB_MEMORATOR_PRODUCT_ID        5
  74
  75 static inline bool kvaser_is_usbcan(const struct usb_device_id *id)
  76 {
  77         return id->idProduct >= USB_USBCAN_REVB_PRODUCT_ID &&
  78                id->idProduct <= USB_MEMORATOR_PRODUCT_ID;
  79 }
  80
  81 /* USB devices features */
  82 #define KVASER_HAS_SILENT_MODE          BIT(0)
  83 #define KVASER_HAS_TXRX_ERRORS          BIT(1)
  84
  85 /* Message header size */
  86 #define MSG_HEADER_LEN                  2
  87
  88 /* Can message flags */
  89 #define MSG_FLAG_ERROR_FRAME            BIT(0)
  90 #define MSG_FLAG_OVERRUN                BIT(1)
  91 #define MSG_FLAG_NERR                   BIT(2)
  92 #define MSG_FLAG_WAKEUP                 BIT(3)
  93 #define MSG_FLAG_REMOTE_FRAME           BIT(4)
  94 #define MSG_FLAG_RESERVED               BIT(5)
  95 #define MSG_FLAG_TX_ACK                 BIT(6)
  96 #define MSG_FLAG_TX_REQUEST             BIT(7)
  97
  98 /* Can states (M16C CxSTRH register) */
  99 #define M16C_STATE_BUS_RESET            BIT(0)
 100 #define M16C_STATE_BUS_ERROR            BIT(4)
 101 #define M16C_STATE_BUS_PASSIVE          BIT(5)
 102 #define M16C_STATE_BUS_OFF              BIT(6)
 103
 104 /* Can msg ids */
 105 #define CMD_RX_STD_MESSAGE              12
 106 #define CMD_TX_STD_MESSAGE              13
 107 #define CMD_RX_EXT_MESSAGE              14
 108 #define CMD_TX_EXT_MESSAGE              15
 109 #define CMD_SET_BUS_PARAMS              16
 110 #define CMD_GET_BUS_PARAMS              17
 111 #define CMD_GET_BUS_PARAMS_REPLY        18
 112 #define CMD_GET_CHIP_STATE              19
 113 #define CMD_CHIP_STATE_EVENT            20
 114 #define CMD_SET_CTRL_MODE               21
 115 #define CMD_GET_CTRL_MODE               22
 116 #define CMD_GET_CTRL_MODE_REPLY         23
 117 #define CMD_RESET_CHIP                  24
 118 #define CMD_RESET_CARD                  25
 119 #define CMD_START_CHIP                  26
 120 #define CMD_START_CHIP_REPLY            27
 121 #define CMD_STOP_CHIP                   28
 122 #define CMD_STOP_CHIP_REPLY             29
 123
 124 #define CMD_LEAF_GET_CARD_INFO2         32
 125 #define CMD_USBCAN_RESET_CLOCK          32
 126 #define CMD_USBCAN_CLOCK_OVERFLOW_EVENT 33
 127
 128 #define CMD_GET_CARD_INFO               34
 129 #define CMD_GET_CARD_INFO_REPLY         35
 130 #define CMD_GET_SOFTWARE_INFO           38
 131 #define CMD_GET_SOFTWARE_INFO_REPLY     39
 132 #define CMD_ERROR_EVENT                 45
 133 #define CMD_FLUSH_QUEUE                 48
 134 #define CMD_RESET_ERROR_COUNTER         49
 135 #define CMD_TX_ACKNOWLEDGE              50
 136 #define CMD_CAN_ERROR_EVENT             51
 137 #define CMD_FLUSH_QUEUE_REPLY           68
 138
 139 #define CMD_LEAF_USB_THROTTLE           77
 140 #define CMD_LEAF_LOG_MESSAGE            106
 141
 142 /* error factors */
 143 #define M16C_EF_ACKE                    BIT(0)
 144 #define M16C_EF_CRCE                    BIT(1)
 145 #define M16C_EF_FORME                   BIT(2)
 146 #define M16C_EF_STFE                    BIT(3)
 147 #define M16C_EF_BITE0                   BIT(4)
 148 #define M16C_EF_BITE1                   BIT(5)
 149 #define M16C_EF_RCVE                    BIT(6)
 150 #define M16C_EF_TRE                     BIT(7)
 151
 152 /* Only Leaf-based devices can report M16C error factors,
 153  * thus define our own error status flags for USBCANII
 154  */
 155 #define USBCAN_ERROR_STATE_NONE         0
 156 #define USBCAN_ERROR_STATE_TX_ERROR     BIT(0)
 157 #define USBCAN_ERROR_STATE_RX_ERROR     BIT(1)
 158 #define USBCAN_ERROR_STATE_BUSERROR     BIT(2)
 159
 160 /* bittiming parameters */
 161 #define KVASER_USB_TSEG1_MIN            1
 162 #define KVASER_USB_TSEG1_MAX            16
 163 #define KVASER_USB_TSEG2_MIN            1
 164 #define KVASER_USB_TSEG2_MAX            8
 165 #define KVASER_USB_SJW_MAX              4
 166 #define KVASER_USB_BRP_MIN              1
 167 #define KVASER_USB_BRP_MAX              64
 168 #define KVASER_USB_BRP_INC              1
 169
 170 /* ctrl modes */
 171 #define KVASER_CTRL_MODE_NORMAL         1
 172 #define KVASER_CTRL_MODE_SILENT         2
 173 #define KVASER_CTRL_MODE_SELFRECEPTION  3
 174 #define KVASER_CTRL_MODE_OFF            4
 175
 176 /* Extended CAN identifier flag */
 177 #define KVASER_EXTENDED_FRAME           BIT(31)
 178
 179 /* Kvaser USB CAN dongles are divided into two major families:
 180  * - Leaf: Based on Renesas M32C, running firmware labeled as 'filo'
 181  * - UsbcanII: Based on Renesas M16C, running firmware labeled as 'helios'
 182  */
 183 enum kvaser_usb_family {
 184         KVASER_LEAF,
 185         KVASER_USBCAN,
 186 };
 187
 188 struct kvaser_msg_simple {
 189         u8 tid;
 190         u8 channel;
 191 } __packed;
 192
 193 struct kvaser_msg_cardinfo {
 194         u8 tid;
 195         u8 nchannels;
 196         union {
 197                 struct {
 198                         __le32 serial_number;
 199                         __le32 padding;
 200                 } __packed leaf0;
 201                 struct {
 202                         __le32 serial_number_low;
 203                         __le32 serial_number_high;
 204                 } __packed usbcan0;
 205         } __packed;
 206         __le32 clock_resolution;
 207         __le32 mfgdate;
 208         u8 ean[8];
 209         u8 hw_revision;
 210         union {
 211                 struct {
 212                         u8 usb_hs_mode;
 213                 } __packed leaf1;
 214                 struct {
 215                         u8 padding;
 216                 } __packed usbcan1;
 217         } __packed;
 218         __le16 padding;
 219 } __packed;
 220
 221 struct kvaser_msg_cardinfo2 {
 222         u8 tid;
 223         u8 reserved;
 224         u8 pcb_id[24];
 225         __le32 oem_unlock_code;
 226 } __packed;
 227
 228 struct leaf_msg_softinfo {
 229         u8 tid;
 230         u8 padding0;
 231         __le32 sw_options;
 232         __le32 fw_version;
 233         __le16 max_outstanding_tx;
 234         __le16 padding1[9];
 235 } __packed;
 236
 237 struct usbcan_msg_softinfo {
 238         u8 tid;
 239         u8 fw_name[5];
 240         __le16 max_outstanding_tx;
 241         u8 padding[6];
 242         __le32 fw_version;
 243         __le16 checksum;
 244         __le16 sw_options;
 245 } __packed;
 246
 247 struct kvaser_msg_busparams {
 248         u8 tid;
 249         u8 channel;
 250         __le32 bitrate;
 251         u8 tseg1;
 252         u8 tseg2;
 253         u8 sjw;
 254         u8 no_samp;
 255 } __packed;
 256
 257 struct kvaser_msg_tx_can {
 258         u8 channel;
 259         u8 tid;
 260         u8 msg[14];
 261         union {
 262                 struct {
 263                         u8 padding;
 264                         u8 flags;
 265                 } __packed leaf;
 266                 struct {
 267                         u8 flags;
 268                         u8 padding;
 269                 } __packed usbcan;
 270         } __packed;
 271 } __packed;
 272
 273 struct kvaser_msg_rx_can_header {
 274         u8 channel;
 275         u8 flag;
 276 } __packed;
 277
 278 struct leaf_msg_rx_can {
 279         u8 channel;
 280         u8 flag;
 281
 282         __le16 time[3];
 283         u8 msg[14];
 284 } __packed;
 285
 286 struct usbcan_msg_rx_can {
 287         u8 channel;
 288         u8 flag;
 289
 290         u8 msg[14];
 291         __le16 time;
 292 } __packed;
 293
 294 struct leaf_msg_chip_state_event {
 295         u8 tid;
 296         u8 channel;
 297
 298         __le16 time[3];
 299         u8 tx_errors_count;
 300         u8 rx_errors_count;
 301
 302         u8 status;
 303         u8 padding[3];
 304 } __packed;
 305
 306 struct usbcan_msg_chip_state_event {
 307         u8 tid;
 308         u8 channel;
 309
 310         u8 tx_errors_count;
 311         u8 rx_errors_count;
 312         __le16 time;
 313
 314         u8 status;
 315         u8 padding[3];
 316 } __packed;
 317
 318 struct kvaser_msg_tx_acknowledge_header {
 319         u8 channel;
 320         u8 tid;
 321 } __packed;
 322
 323 struct leaf_msg_tx_acknowledge {
 324         u8 channel;
 325         u8 tid;
 326
 327         __le16 time[3];
 328         u8 flags;
 329         u8 time_offset;
 330 } __packed;
 331
 332 struct usbcan_msg_tx_acknowledge {
 333         u8 channel;
 334         u8 tid;
 335
 336         __le16 time;
 337         __le16 padding;
 338 } __packed;
 339
 340 struct leaf_msg_error_event {
 341         u8 tid;
 342         u8 flags;
 343         __le16 time[3];
 344         u8 channel;
 345         u8 padding;
 346         u8 tx_errors_count;
 347         u8 rx_errors_count;
 348         u8 status;
 349         u8 error_factor;
 350 } __packed;
 351
 352 struct usbcan_msg_error_event {
 353         u8 tid;
 354         u8 padding;
 355         u8 tx_errors_count_ch0;
 356         u8 rx_errors_count_ch0;
 357         u8 tx_errors_count_ch1;
 358         u8 rx_errors_count_ch1;
 359         u8 status_ch0;
 360         u8 status_ch1;
 361         __le16 time;
 362 } __packed;
 363
 364 struct kvaser_msg_ctrl_mode {
 365         u8 tid;
 366         u8 channel;
 367         u8 ctrl_mode;
 368         u8 padding[3];
 369 } __packed;
 370
 371 struct kvaser_msg_flush_queue {
 372         u8 tid;
 373         u8 channel;
 374         u8 flags;
 375         u8 padding[3];
 376 } __packed;
 377
 378 struct leaf_msg_log_message {
 379         u8 channel;
 380         u8 flags;
 381         __le16 time[3];
 382         u8 dlc;
 383         u8 time_offset;
 384         __le32 id;
 385         u8 data[8];
 386 } __packed;
 387
 388 struct kvaser_msg {
 389         u8 len;
 390         u8 id;
 391         union   {
 392                 struct kvaser_msg_simple simple;
 393                 struct kvaser_msg_cardinfo cardinfo;
 394                 struct kvaser_msg_cardinfo2 cardinfo2;
 395                 struct kvaser_msg_busparams busparams;
 396
 397                 struct kvaser_msg_rx_can_header rx_can_header;
 398                 struct kvaser_msg_tx_acknowledge_header tx_acknowledge_header;
 399
 400                 union {
 401                         struct leaf_msg_softinfo softinfo;
 402                         struct leaf_msg_rx_can rx_can;
 403                         struct leaf_msg_chip_state_event chip_state_event;
 404                         struct leaf_msg_tx_acknowledge tx_acknowledge;
 405                         struct leaf_msg_error_event error_event;
 406                         struct leaf_msg_log_message log_message;
 407                 } __packed leaf;
 408
 409                 union {
 410                         struct usbcan_msg_softinfo softinfo;
 411                         struct usbcan_msg_rx_can rx_can;
 412                         struct usbcan_msg_chip_state_event chip_state_event;
 413                         struct usbcan_msg_tx_acknowledge tx_acknowledge;
 414                         struct usbcan_msg_error_event error_event;
 415                 } __packed usbcan;
 416
 417                 struct kvaser_msg_tx_can tx_can;
 418                 struct kvaser_msg_ctrl_mode ctrl_mode;
 419                 struct kvaser_msg_flush_queue flush_queue;
 420         } u;
 421 } __packed;
 422
 423 /* Summary of a kvaser error event, for a unified Leaf/Usbcan error
 424  * handling. Some discrepancies between the two families exist:
 425  *
 426  * - USBCAN firmware does not report M16C "error factors"
 427  * - USBCAN controllers has difficulties reporting if the raised error
 428  *   event is for ch0 or ch1. They leave such arbitration to the OS
 429  *   driver by letting it compare error counters with previous values
 430  *   and decide the error event's channel. Thus for USBCAN, the channel
 431  *   field is only advisory.
 432  */
 433 struct kvaser_usb_error_summary {
 434         u8 channel, status, txerr, rxerr;
 435         union {
 436                 struct {
 437                         u8 error_factor;
 438                 } leaf;
 439                 struct {
 440                         u8 other_ch_status;
 441                         u8 error_state;
 442                 } usbcan;
 443         };
 444 };
 445
 446 /* Context for an outstanding, not yet ACKed, transmission */
 447 struct kvaser_usb_tx_urb_context {
 448         struct kvaser_usb_net_priv *priv;
 449         u32 echo_index;
 450         int dlc;
 451 };
 452
 453 struct kvaser_usb {
 454         struct usb_device *udev;
 455         struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
 456
 457         struct usb_endpoint_descriptor *bulk_in, *bulk_out;
 458         struct usb_anchor rx_submitted;
 459
 460         /* @max_tx_urbs: Firmware-reported maximum number of oustanding,
 461          * not yet ACKed, transmissions on this device. This value is
 462          * also used as a sentinel for marking free tx contexts.
 463          */
 464         u32 fw_version;
 465         unsigned int nchannels;
 466         unsigned int max_tx_urbs;
 467         enum kvaser_usb_family family;
 468
 469         bool rxinitdone;
 470         void *rxbuf[MAX_RX_URBS];
 471         dma_addr_t rxbuf_dma[MAX_RX_URBS];
 472 };
 473
 474 struct kvaser_usb_net_priv {
 475         struct can_priv can;
 476         struct can_berr_counter bec;
 477
 478         struct kvaser_usb *dev;
 479         struct net_device *netdev;
 480         int channel;
 481
 482         struct completion start_comp, stop_comp;
 483         struct usb_anchor tx_submitted;
 484
 485         spinlock_t tx_contexts_lock;
 486         int active_tx_contexts;
 487         struct kvaser_usb_tx_urb_context tx_contexts[];
 488 };
 489
 490 static const struct usb_device_id kvaser_usb_table[] = {
 491         /* Leaf family IDs */
 492         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
 493         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
 494         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
 495                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 496                                KVASER_HAS_SILENT_MODE },
 497         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
 498                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 499                                KVASER_HAS_SILENT_MODE },
 500         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
 501                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 502                                KVASER_HAS_SILENT_MODE },
 503         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
 504                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 505                                KVASER_HAS_SILENT_MODE },
 506         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
 507                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 508                                KVASER_HAS_SILENT_MODE },
 509         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
 510                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 511                                KVASER_HAS_SILENT_MODE },
 512         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
 513                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 514                                KVASER_HAS_SILENT_MODE },
 515         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
 516                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 517                                KVASER_HAS_SILENT_MODE },
 518         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
 519                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 520                                KVASER_HAS_SILENT_MODE },
 521         { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
 522                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 523         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
 524         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
 525                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 526                                KVASER_HAS_SILENT_MODE },
 527         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
 528                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 529         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
 530                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 531         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
 532                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 533         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
 534                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 535         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
 536                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 537         { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
 538                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 539         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
 540         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
 541
 542         /* USBCANII family IDs */
 543         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
 544                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 545         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
 546                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 547         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
 548                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 549         { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
 550                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 551
 552         { }
 553 };
 554 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
 555
 556 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
 557                                       struct kvaser_msg *msg)
 558 {
 559         int actual_len;
 560
 561         return usb_bulk_msg(dev->udev,
 562                             usb_sndbulkpipe(dev->udev,
 563                                         dev->bulk_out->bEndpointAddress),
 564                             msg, msg->len, &actual_len,
 565                             USB_SEND_TIMEOUT);
 566 }
 567
 568 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
 569                                struct kvaser_msg *msg)
 570 {
 571         struct kvaser_msg *tmp;
 572         void *buf;
 573         int actual_len;
 574         int err;
 575         int pos;
 576         unsigned long to = jiffies + msecs_to_jiffies(USB_RECV_TIMEOUT);
 577
 578         buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
 579         if (!buf)
 580                 return -ENOMEM;
 581
 582         do {
 583                 err = usb_bulk_msg(dev->udev,
 584                                    usb_rcvbulkpipe(dev->udev,
 585                                         dev->bulk_in->bEndpointAddress),
 586                                    buf, RX_BUFFER_SIZE, &actual_len,
 587                                    USB_RECV_TIMEOUT);
 588                 if (err < 0)
 589                         goto end;
 590
 591                 pos = 0;
 592                 while (pos <= actual_len - MSG_HEADER_LEN) {
 593                         tmp = buf + pos;
 594
 595                         /* Handle messages crossing the USB endpoint max packet
 596                          * size boundary. Check kvaser_usb_read_bulk_callback()
 597                          * for further details.
 598                          */
 599                         if (tmp->len == 0) {
 600                                 pos = round_up(pos, le16_to_cpu(dev->bulk_in->
 601                                                                 wMaxPacketSize));
 602                                 continue;
 603                         }
 604
 605                         if (pos + tmp->len > actual_len) {
 606                                 dev_err_ratelimited(dev->udev->dev.parent,
 607                                                     "Format error\n");
 608                                 break;
 609                         }
 610
 611                         if (tmp->id == id) {
 612                                 memcpy(msg, tmp, tmp->len);
 613                                 goto end;
 614                         }
 615
 616                         pos += tmp->len;
 617                 }
 618         } while (time_before(jiffies, to));
 619
 620         err = -EINVAL;
 621
 622 end:
 623         kfree(buf);
 624
 625         return err;
 626 }
 627
 628 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
 629                                       u8 msg_id, int channel)
 630 {
 631         struct kvaser_msg *msg;
 632         int rc;
 633
 634         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 635         if (!msg)
 636                 return -ENOMEM;
 637
 638         msg->id = msg_id;
 639         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 640         msg->u.simple.channel = channel;
 641         msg->u.simple.tid = 0xff;
 642
 643         rc = kvaser_usb_send_msg(dev, msg);
 644
 645         kfree(msg);
 646         return rc;
 647 }
 648
 649 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
 650 {
 651         struct kvaser_msg msg;
 652         int err;
 653
 654         err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
 655         if (err)
 656                 return err;
 657
 658         err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
 659         if (err)
 660                 return err;
 661
 662         switch (dev->family) {
 663         case KVASER_LEAF:
 664                 dev->fw_version = le32_to_cpu(msg.u.leaf.softinfo.fw_version);
 665                 dev->max_tx_urbs =
 666                         le16_to_cpu(msg.u.leaf.softinfo.max_outstanding_tx);
 667                 break;
 668         case KVASER_USBCAN:
 669                 dev->fw_version = le32_to_cpu(msg.u.usbcan.softinfo.fw_version);
 670                 dev->max_tx_urbs =
 671                         le16_to_cpu(msg.u.usbcan.softinfo.max_outstanding_tx);
 672                 break;
 673         }
 674
 675         return 0;
 676 }
 677
 678 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
 679 {
 680         struct kvaser_msg msg;
 681         int err;
 682
 683         err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
 684         if (err)
 685                 return err;
 686
 687         err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
 688         if (err)
 689                 return err;
 690
 691         dev->nchannels = msg.u.cardinfo.nchannels;
 692         if ((dev->nchannels > MAX_NET_DEVICES) ||
 693             (dev->family == KVASER_USBCAN &&
 694              dev->nchannels > MAX_USBCAN_NET_DEVICES))
 695                 return -EINVAL;
 696
 697         return 0;
 698 }
 699
 700 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
 701                                       const struct kvaser_msg *msg)
 702 {
 703         struct net_device_stats *stats;
 704         struct kvaser_usb_tx_urb_context *context;
 705         struct kvaser_usb_net_priv *priv;
 706         struct sk_buff *skb;
 707         struct can_frame *cf;
 708         unsigned long flags;
 709         u8 channel, tid;
 710
 711         channel = msg->u.tx_acknowledge_header.channel;
 712         tid = msg->u.tx_acknowledge_header.tid;
 713
 714         if (channel >= dev->nchannels) {
 715                 dev_err(dev->udev->dev.parent,
 716                         "Invalid channel number (%d)\n", channel);
 717                 return;
 718         }
 719
 720         priv = dev->nets[channel];
 721
 722         if (!netif_device_present(priv->netdev))
 723                 return;
 724
 725         stats = &priv->netdev->stats;
 726
 727         context = &priv->tx_contexts[tid % dev->max_tx_urbs];
 728
 729         /* Sometimes the state change doesn't come after a bus-off event */
 730         if (priv->can.restart_ms &&
 731             (priv->can.state >= CAN_STATE_BUS_OFF)) {
 732                 skb = alloc_can_err_skb(priv->netdev, &cf);
 733                 if (skb) {
 734                         cf->can_id |= CAN_ERR_RESTARTED;
 735
 736                         stats->rx_packets++;
 737                         stats->rx_bytes += cf->can_dlc;
 738                         netif_rx(skb);
 739                 } else {
 740                         netdev_err(priv->netdev,
 741                                    "No memory left for err_skb\n");
 742                 }
 743
 744                 priv->can.can_stats.restarts++;
 745                 netif_carrier_on(priv->netdev);
 746
 747                 priv->can.state = CAN_STATE_ERROR_ACTIVE;
 748         }
 749
 750         stats->tx_packets++;
 751         stats->tx_bytes += context->dlc;
 752
 753         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 754
 755         can_get_echo_skb(priv->netdev, context->echo_index);
 756         context->echo_index = dev->max_tx_urbs;
 757         --priv->active_tx_contexts;
 758         netif_wake_queue(priv->netdev);
 759
 760         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 761 }
 762
 763 static void kvaser_usb_simple_msg_callback(struct urb *urb)
 764 {
 765         struct net_device *netdev = urb->context;
 766
 767         kfree(urb->transfer_buffer);
 768
 769         if (urb->status)
 770                 netdev_warn(netdev, "urb status received: %d\n",
 771                             urb->status);
 772 }
 773
 774 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
 775                                        u8 msg_id)
 776 {
 777         struct kvaser_usb *dev = priv->dev;
 778         struct net_device *netdev = priv->netdev;
 779         struct kvaser_msg *msg;
 780         struct urb *urb;
 781         void *buf;
 782         int err;
 783
 784         urb = usb_alloc_urb(0, GFP_ATOMIC);
 785         if (!urb) {
 786                 netdev_err(netdev, "No memory left for URBs\n");
 787                 return -ENOMEM;
 788         }
 789
 790         buf = kzalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
 791         if (!buf) {
 792                 usb_free_urb(urb);
 793                 return -ENOMEM;
 794         }
 795
 796         msg = (struct kvaser_msg *)buf;
 797         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 798         msg->id = msg_id;
 799         msg->u.simple.channel = priv->channel;
 800
 801         usb_fill_bulk_urb(urb, dev->udev,
 802                           usb_sndbulkpipe(dev->udev,
 803                                           dev->bulk_out->bEndpointAddress),
 804                           buf, msg->len,
 805                           kvaser_usb_simple_msg_callback, netdev);
 806         usb_anchor_urb(urb, &priv->tx_submitted);
 807
 808         err = usb_submit_urb(urb, GFP_ATOMIC);
 809         if (err) {
 810                 netdev_err(netdev, "Error transmitting URB\n");
 811                 usb_unanchor_urb(urb);
 812                 kfree(buf);
 813                 usb_free_urb(urb);
 814                 return err;
 815         }
 816
 817         usb_free_urb(urb);
 818
 819         return 0;
 820 }
 821
 822 static void kvaser_usb_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
 823                                                  const struct kvaser_usb_error_summary *es,
 824                                                  struct can_frame *cf)
 825 {
 826         struct kvaser_usb *dev = priv->dev;
 827         struct net_device_stats *stats = &priv->netdev->stats;
 828         enum can_state cur_state, new_state, tx_state, rx_state;
 829
 830         netdev_dbg(priv->netdev, "Error status: 0x%02x\n", es->status);
 831
 832         new_state = cur_state = priv->can.state;
 833
 834         if (es->status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET))
 835                 new_state = CAN_STATE_BUS_OFF;
 836         else if (es->status & M16C_STATE_BUS_PASSIVE)
 837                 new_state = CAN_STATE_ERROR_PASSIVE;
 838         else if (es->status & M16C_STATE_BUS_ERROR) {
 839                 /* Guard against spurious error events after a busoff */
 840                 if (cur_state < CAN_STATE_BUS_OFF) {
 841                         if ((es->txerr >= 128) || (es->rxerr >= 128))
 842                                 new_state = CAN_STATE_ERROR_PASSIVE;
 843                         else if ((es->txerr >= 96) || (es->rxerr >= 96))
 844                                 new_state = CAN_STATE_ERROR_WARNING;
 845                         else if (cur_state > CAN_STATE_ERROR_ACTIVE)
 846                                 new_state = CAN_STATE_ERROR_ACTIVE;
 847                 }
 848         }
 849
 850         if (!es->status)
 851                 new_state = CAN_STATE_ERROR_ACTIVE;
 852
 853         if (new_state != cur_state) {
 854                 tx_state = (es->txerr >= es->rxerr) ? new_state : 0;
 855                 rx_state = (es->txerr <= es->rxerr) ? new_state : 0;
 856
 857                 can_change_state(priv->netdev, cf, tx_state, rx_state);
 858         }
 859
 860         if (priv->can.restart_ms &&
 861             (cur_state >= CAN_STATE_BUS_OFF) &&
 862             (new_state < CAN_STATE_BUS_OFF)) {
 863                 priv->can.can_stats.restarts++;
 864         }
 865
 866         switch (dev->family) {
 867         case KVASER_LEAF:
 868                 if (es->leaf.error_factor) {
 869                         priv->can.can_stats.bus_error++;
 870                         stats->rx_errors++;
 871                 }
 872                 break;
 873         case KVASER_USBCAN:
 874                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_TX_ERROR)
 875                         stats->tx_errors++;
 876                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_RX_ERROR)
 877                         stats->rx_errors++;
 878                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
 879                         priv->can.can_stats.bus_error++;
 880                 }
 881                 break;
 882         }
 883
 884         priv->bec.txerr = es->txerr;
 885         priv->bec.rxerr = es->rxerr;
 886 }
 887
 888 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
 889                                 const struct kvaser_usb_error_summary *es)
 890 {
 891         struct can_frame *cf, tmp_cf = { .can_id = CAN_ERR_FLAG, .can_dlc = CAN_ERR_DLC };
 892         struct sk_buff *skb;
 893         struct net_device_stats *stats;
 894         struct kvaser_usb_net_priv *priv;
 895         enum can_state old_state, new_state;
 896
 897         if (es->channel >= dev->nchannels) {
 898                 dev_err(dev->udev->dev.parent,
 899                         "Invalid channel number (%d)\n", es->channel);
 900                 return;
 901         }
 902
 903         priv = dev->nets[es->channel];
 904         stats = &priv->netdev->stats;
 905
 906         /* Update all of the can interface's state and error counters before
 907          * trying any memory allocation that can actually fail with -ENOMEM.
 908          *
 909          * We send a temporary stack-allocated error can frame to
 910          * can_change_state() for the very same reason.
 911          *
 912          * TODO: Split can_change_state() responsibility between updating the
 913          * can interface's state and counters, and the setting up of can error
 914          * frame ID and data to userspace. Remove stack allocation afterwards.
 915          */
 916         old_state = priv->can.state;
 917         kvaser_usb_rx_error_update_can_state(priv, es, &tmp_cf);
 918         new_state = priv->can.state;
 919
 920         skb = alloc_can_err_skb(priv->netdev, &cf);
 921         if (!skb) {
 922                 stats->rx_dropped++;
 923                 return;
 924         }
 925         memcpy(cf, &tmp_cf, sizeof(*cf));
 926
 927         if (new_state != old_state) {
 928                 if (es->status &
 929                     (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
 930                         if (!priv->can.restart_ms)
 931                                 kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
 932                         netif_carrier_off(priv->netdev);
 933                 }
 934
 935                 if (priv->can.restart_ms &&
 936                     (old_state >= CAN_STATE_BUS_OFF) &&
 937                     (new_state < CAN_STATE_BUS_OFF)) {
 938                         cf->can_id |= CAN_ERR_RESTARTED;
 939                         netif_carrier_on(priv->netdev);
 940                 }
 941         }
 942
 943         switch (dev->family) {
 944         case KVASER_LEAF:
 945                 if (es->leaf.error_factor) {
 946                         cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
 947
 948                         if (es->leaf.error_factor & M16C_EF_ACKE)
 949                                 cf->data[3] = CAN_ERR_PROT_LOC_ACK;
 950                         if (es->leaf.error_factor & M16C_EF_CRCE)
 951                                 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 952                         if (es->leaf.error_factor & M16C_EF_FORME)
 953                                 cf->data[2] |= CAN_ERR_PROT_FORM;
 954                         if (es->leaf.error_factor & M16C_EF_STFE)
 955                                 cf->data[2] |= CAN_ERR_PROT_STUFF;
 956                         if (es->leaf.error_factor & M16C_EF_BITE0)
 957                                 cf->data[2] |= CAN_ERR_PROT_BIT0;
 958                         if (es->leaf.error_factor & M16C_EF_BITE1)
 959                                 cf->data[2] |= CAN_ERR_PROT_BIT1;
 960                         if (es->leaf.error_factor & M16C_EF_TRE)
 961                                 cf->data[2] |= CAN_ERR_PROT_TX;
 962                 }
 963                 break;
 964         case KVASER_USBCAN:
 965                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
 966                         cf->can_id |= CAN_ERR_BUSERROR;
 967                 }
 968                 break;
 969         }
 970
 971         cf->data[6] = es->txerr;
 972         cf->data[7] = es->rxerr;
 973
 974         stats->rx_packets++;
 975         stats->rx_bytes += cf->can_dlc;
 976         netif_rx(skb);
 977 }
 978
 979 /* For USBCAN, report error to userspace iff the channels's errors counter
 980  * has changed, or we're the only channel seeing a bus error state.
 981  */
 982 static void kvaser_usbcan_conditionally_rx_error(const struct kvaser_usb *dev,
 983                                                  struct kvaser_usb_error_summary *es)
 984 {
 985         struct kvaser_usb_net_priv *priv;
 986         int channel;
 987         bool report_error;
 988
 989         channel = es->channel;
 990         if (channel >= dev->nchannels) {
 991                 dev_err(dev->udev->dev.parent,
 992                         "Invalid channel number (%d)\n", channel);
 993                 return;
 994         }
 995
 996         priv = dev->nets[channel];
 997         report_error = false;
 998
 999         if (es->txerr != priv->bec.txerr) {
1000                 es->usbcan.error_state |= USBCAN_ERROR_STATE_TX_ERROR;
1001                 report_error = true;
1002         }
1003         if (es->rxerr != priv->bec.rxerr) {
1004                 es->usbcan.error_state |= USBCAN_ERROR_STATE_RX_ERROR;
1005                 report_error = true;
1006         }
1007         if ((es->status & M16C_STATE_BUS_ERROR) &&
1008             !(es->usbcan.other_ch_status & M16C_STATE_BUS_ERROR)) {
1009                 es->usbcan.error_state |= USBCAN_ERROR_STATE_BUSERROR;
1010                 report_error = true;
1011         }
1012
1013         if (report_error)
1014                 kvaser_usb_rx_error(dev, es);
1015 }
1016
1017 static void kvaser_usbcan_rx_error(const struct kvaser_usb *dev,
1018                                    const struct kvaser_msg *msg)
1019 {
1020         struct kvaser_usb_error_summary es = { };
1021
1022         switch (msg->id) {
1023         /* Sometimes errors are sent as unsolicited chip state events */
1024         case CMD_CHIP_STATE_EVENT:
1025                 es.channel = msg->u.usbcan.chip_state_event.channel;
1026                 es.status =  msg->u.usbcan.chip_state_event.status;
1027                 es.txerr = msg->u.usbcan.chip_state_event.tx_errors_count;
1028                 es.rxerr = msg->u.usbcan.chip_state_event.rx_errors_count;
1029                 kvaser_usbcan_conditionally_rx_error(dev, &es);
1030                 break;
1031
1032         case CMD_CAN_ERROR_EVENT:
1033                 es.channel = 0;
1034                 es.status = msg->u.usbcan.error_event.status_ch0;
1035                 es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch0;
1036                 es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch0;
1037                 es.usbcan.other_ch_status =
1038                         msg->u.usbcan.error_event.status_ch1;
1039                 kvaser_usbcan_conditionally_rx_error(dev, &es);
1040
1041                 /* The USBCAN firmware supports up to 2 channels.
1042                  * Now that ch0 was checked, check if ch1 has any errors.
1043                  */
1044                 if (dev->nchannels == MAX_USBCAN_NET_DEVICES) {
1045                         es.channel = 1;
1046                         es.status = msg->u.usbcan.error_event.status_ch1;
1047                         es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch1;
1048                         es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch1;
1049                         es.usbcan.other_ch_status =
1050                                 msg->u.usbcan.error_event.status_ch0;
1051                         kvaser_usbcan_conditionally_rx_error(dev, &es);
1052                 }
1053                 break;
1054
1055         default:
1056                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1057                         msg->id);
1058         }
1059 }
1060
1061 static void kvaser_leaf_rx_error(const struct kvaser_usb *dev,
1062                                  const struct kvaser_msg *msg)
1063 {
1064         struct kvaser_usb_error_summary es = { };
1065
1066         switch (msg->id) {
1067         case CMD_CAN_ERROR_EVENT:
1068                 es.channel = msg->u.leaf.error_event.channel;
1069                 es.status =  msg->u.leaf.error_event.status;
1070                 es.txerr = msg->u.leaf.error_event.tx_errors_count;
1071                 es.rxerr = msg->u.leaf.error_event.rx_errors_count;
1072                 es.leaf.error_factor = msg->u.leaf.error_event.error_factor;
1073                 break;
1074         case CMD_LEAF_LOG_MESSAGE:
1075                 es.channel = msg->u.leaf.log_message.channel;
1076                 es.status = msg->u.leaf.log_message.data[0];
1077                 es.txerr = msg->u.leaf.log_message.data[2];
1078                 es.rxerr = msg->u.leaf.log_message.data[3];
1079                 es.leaf.error_factor = msg->u.leaf.log_message.data[1];
1080                 break;
1081         case CMD_CHIP_STATE_EVENT:
1082                 es.channel = msg->u.leaf.chip_state_event.channel;
1083                 es.status =  msg->u.leaf.chip_state_event.status;
1084                 es.txerr = msg->u.leaf.chip_state_event.tx_errors_count;
1085                 es.rxerr = msg->u.leaf.chip_state_event.rx_errors_count;
1086                 es.leaf.error_factor = 0;
1087                 break;
1088         default:
1089                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1090                         msg->id);
1091                 return;
1092         }
1093
1094         kvaser_usb_rx_error(dev, &es);
1095 }
1096
1097 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
1098                                   const struct kvaser_msg *msg)
1099 {
1100         struct can_frame *cf;
1101         struct sk_buff *skb;
1102         struct net_device_stats *stats = &priv->netdev->stats;
1103
1104         if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1105                                          MSG_FLAG_NERR)) {
1106                 netdev_err(priv->netdev, "Unknown error (flags: 0x%02x)\n",
1107                            msg->u.rx_can_header.flag);
1108
1109                 stats->rx_errors++;
1110                 return;
1111         }
1112
1113         if (msg->u.rx_can_header.flag & MSG_FLAG_OVERRUN) {
1114                 stats->rx_over_errors++;
1115                 stats->rx_errors++;
1116
1117                 skb = alloc_can_err_skb(priv->netdev, &cf);
1118                 if (!skb) {
1119                         stats->rx_dropped++;
1120                         return;
1121                 }
1122
1123                 cf->can_id |= CAN_ERR_CRTL;
1124                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
1125
1126                 stats->rx_packets++;
1127                 stats->rx_bytes += cf->can_dlc;
1128                 netif_rx(skb);
1129         }
1130 }
1131
1132 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
1133                                   const struct kvaser_msg *msg)
1134 {
1135         struct kvaser_usb_net_priv *priv;
1136         struct can_frame *cf;
1137         struct sk_buff *skb;
1138         struct net_device_stats *stats;
1139         u8 channel = msg->u.rx_can_header.channel;
1140         const u8 *rx_msg = NULL;        /* GCC */
1141
1142         if (channel >= dev->nchannels) {
1143                 dev_err(dev->udev->dev.parent,
1144                         "Invalid channel number (%d)\n", channel);
1145                 return;
1146         }
1147
1148         priv = dev->nets[channel];
1149         stats = &priv->netdev->stats;
1150
1151         if ((msg->u.rx_can_header.flag & MSG_FLAG_ERROR_FRAME) &&
1152             (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE)) {
1153                 kvaser_leaf_rx_error(dev, msg);
1154                 return;
1155         } else if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1156                                                 MSG_FLAG_NERR |
1157                                                 MSG_FLAG_OVERRUN)) {
1158                 kvaser_usb_rx_can_err(priv, msg);
1159                 return;
1160         } else if (msg->u.rx_can_header.flag & ~MSG_FLAG_REMOTE_FRAME) {
1161                 netdev_warn(priv->netdev,
1162                             "Unhandled frame (flags: 0x%02x)",
1163                             msg->u.rx_can_header.flag);
1164                 return;
1165         }
1166
1167         switch (dev->family) {
1168         case KVASER_LEAF:
1169                 rx_msg = msg->u.leaf.rx_can.msg;
1170                 break;
1171         case KVASER_USBCAN:
1172                 rx_msg = msg->u.usbcan.rx_can.msg;
1173                 break;
1174         }
1175
1176         skb = alloc_can_skb(priv->netdev, &cf);
1177         if (!skb) {
1178                 stats->rx_dropped++;
1179                 return;
1180         }
1181
1182         if (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE) {
1183                 cf->can_id = le32_to_cpu(msg->u.leaf.log_message.id);
1184                 if (cf->can_id & KVASER_EXTENDED_FRAME)
1185                         cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
1186                 else
1187                         cf->can_id &= CAN_SFF_MASK;
1188
1189                 cf->can_dlc = get_can_dlc(msg->u.leaf.log_message.dlc);
1190
1191                 if (msg->u.leaf.log_message.flags & MSG_FLAG_REMOTE_FRAME)
1192                         cf->can_id |= CAN_RTR_FLAG;
1193                 else
1194                         memcpy(cf->data, &msg->u.leaf.log_message.data,
1195                                cf->can_dlc);
1196         } else {
1197                 cf->can_id = ((rx_msg[0] & 0x1f) << 6) | (rx_msg[1] & 0x3f);
1198
1199                 if (msg->id == CMD_RX_EXT_MESSAGE) {
1200                         cf->can_id <<= 18;
1201                         cf->can_id |= ((rx_msg[2] & 0x0f) << 14) |
1202                                       ((rx_msg[3] & 0xff) << 6) |
1203                                       (rx_msg[4] & 0x3f);
1204                         cf->can_id |= CAN_EFF_FLAG;
1205                 }
1206
1207                 cf->can_dlc = get_can_dlc(rx_msg[5]);
1208
1209                 if (msg->u.rx_can_header.flag & MSG_FLAG_REMOTE_FRAME)
1210                         cf->can_id |= CAN_RTR_FLAG;
1211                 else
1212                         memcpy(cf->data, &rx_msg[6],
1213                                cf->can_dlc);
1214         }
1215
1216         stats->rx_packets++;
1217         stats->rx_bytes += cf->can_dlc;
1218         netif_rx(skb);
1219 }
1220
1221 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
1222                                         const struct kvaser_msg *msg)
1223 {
1224         struct kvaser_usb_net_priv *priv;
1225         u8 channel = msg->u.simple.channel;
1226
1227         if (channel >= dev->nchannels) {
1228                 dev_err(dev->udev->dev.parent,
1229                         "Invalid channel number (%d)\n", channel);
1230                 return;
1231         }
1232
1233         priv = dev->nets[channel];
1234
1235         if (completion_done(&priv->start_comp) &&
1236             netif_queue_stopped(priv->netdev)) {
1237                 netif_wake_queue(priv->netdev);
1238         } else {
1239                 netif_start_queue(priv->netdev);
1240                 complete(&priv->start_comp);
1241         }
1242 }
1243
1244 static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
1245                                        const struct kvaser_msg *msg)
1246 {
1247         struct kvaser_usb_net_priv *priv;
1248         u8 channel = msg->u.simple.channel;
1249
1250         if (channel >= dev->nchannels) {
1251                 dev_err(dev->udev->dev.parent,
1252                         "Invalid channel number (%d)\n", channel);
1253                 return;
1254         }
1255
1256         priv = dev->nets[channel];
1257
1258         complete(&priv->stop_comp);
1259 }
1260
1261 static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
1262                                       const struct kvaser_msg *msg)
1263 {
1264         switch (msg->id) {
1265         case CMD_START_CHIP_REPLY:
1266                 kvaser_usb_start_chip_reply(dev, msg);
1267                 break;
1268
1269         case CMD_STOP_CHIP_REPLY:
1270                 kvaser_usb_stop_chip_reply(dev, msg);
1271                 break;
1272
1273         case CMD_RX_STD_MESSAGE:
1274         case CMD_RX_EXT_MESSAGE:
1275                 kvaser_usb_rx_can_msg(dev, msg);
1276                 break;
1277
1278         case CMD_LEAF_LOG_MESSAGE:
1279                 if (dev->family != KVASER_LEAF)
1280                         goto warn;
1281                 kvaser_usb_rx_can_msg(dev, msg);
1282                 break;
1283
1284         case CMD_CHIP_STATE_EVENT:
1285         case CMD_CAN_ERROR_EVENT:
1286                 if (dev->family == KVASER_LEAF)
1287                         kvaser_leaf_rx_error(dev, msg);
1288                 else
1289                         kvaser_usbcan_rx_error(dev, msg);
1290                 break;
1291
1292         case CMD_TX_ACKNOWLEDGE:
1293                 kvaser_usb_tx_acknowledge(dev, msg);
1294                 break;
1295
1296         /* Ignored messages */
1297         case CMD_USBCAN_CLOCK_OVERFLOW_EVENT:
1298                 if (dev->family != KVASER_USBCAN)
1299                         goto warn;
1300                 break;
1301
1302         case CMD_FLUSH_QUEUE_REPLY:
1303                 if (dev->family != KVASER_LEAF)
1304                         goto warn;
1305                 break;
1306
1307         default:
1308 warn:           dev_warn(dev->udev->dev.parent,
1309                          "Unhandled message (%d)\n", msg->id);
1310                 break;
1311         }
1312 }
1313
1314 static void kvaser_usb_read_bulk_callback(struct urb *urb)
1315 {
1316         struct kvaser_usb *dev = urb->context;
1317         struct kvaser_msg *msg;
1318         int pos = 0;
1319         int err, i;
1320
1321         switch (urb->status) {
1322         case 0:
1323                 break;
1324         case -ENOENT:
1325         case -EPIPE:
1326         case -EPROTO:
1327         case -ESHUTDOWN:
1328                 return;
1329         default:
1330                 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
1331                          urb->status);
1332                 goto resubmit_urb;
1333         }
1334
1335         while (pos <= (int)(urb->actual_length - MSG_HEADER_LEN)) {
1336                 msg = urb->transfer_buffer + pos;
1337
1338                 /* The Kvaser firmware can only read and write messages that
1339                  * does not cross the USB's endpoint wMaxPacketSize boundary.
1340                  * If a follow-up command crosses such boundary, firmware puts
1341                  * a placeholder zero-length command in its place then aligns
1342                  * the real command to the next max packet size.
1343                  *
1344                  * Handle such cases or we're going to miss a significant
1345                  * number of events in case of a heavy rx load on the bus.
1346                  */
1347                 if (msg->len == 0) {
1348                         pos = round_up(pos, le16_to_cpu(dev->bulk_in->
1349                                                         wMaxPacketSize));
1350                         continue;
1351                 }
1352
1353                 if (pos + msg->len > urb->actual_length) {
1354                         dev_err_ratelimited(dev->udev->dev.parent,
1355                                             "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                         dev_warn(dev->udev->dev.parent,
1401                                  "No memory left for URBs\n");
1402                         err = -ENOMEM;
1403                         break;
1404                 }
1405
1406                 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1407                                          GFP_KERNEL, &buf_dma);
1408                 if (!buf) {
1409                         dev_warn(dev->udev->dev.parent,
1410                                  "No memory left for USB buffer\n");
1411                         usb_free_urb(urb);
1412                         err = -ENOMEM;
1413                         break;
1414                 }
1415
1416                 usb_fill_bulk_urb(urb, dev->udev,
1417                                   usb_rcvbulkpipe(dev->udev,
1418                                           dev->bulk_in->bEndpointAddress),
1419                                   buf, RX_BUFFER_SIZE,
1420                                   kvaser_usb_read_bulk_callback,
1421                                   dev);
1422                 urb->transfer_dma = buf_dma;
1423                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1424                 usb_anchor_urb(urb, &dev->rx_submitted);
1425
1426                 err = usb_submit_urb(urb, GFP_KERNEL);
1427                 if (err) {
1428                         usb_unanchor_urb(urb);
1429                         usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1430                                           buf_dma);
1431                         usb_free_urb(urb);
1432                         break;
1433                 }
1434
1435                 dev->rxbuf[i] = buf;
1436                 dev->rxbuf_dma[i] = buf_dma;
1437
1438                 usb_free_urb(urb);
1439         }
1440
1441         if (i == 0) {
1442                 dev_warn(dev->udev->dev.parent,
1443                          "Cannot setup read URBs, error %d\n", err);
1444                 return err;
1445         } else if (i < MAX_RX_URBS) {
1446                 dev_warn(dev->udev->dev.parent,
1447                          "RX performances may be slow\n");
1448         }
1449
1450         dev->rxinitdone = true;
1451
1452         return 0;
1453 }
1454
1455 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1456 {
1457         struct kvaser_msg *msg;
1458         int rc;
1459
1460         msg = kzalloc(sizeof(*msg), GFP_KERNEL);
1461         if (!msg)
1462                 return -ENOMEM;
1463
1464         msg->id = CMD_SET_CTRL_MODE;
1465         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1466         msg->u.ctrl_mode.tid = 0xff;
1467         msg->u.ctrl_mode.channel = priv->channel;
1468
1469         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1470                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1471         else
1472                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1473
1474         rc = kvaser_usb_send_msg(priv->dev, msg);
1475
1476         kfree(msg);
1477         return rc;
1478 }
1479
1480 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1481 {
1482         int err;
1483
1484         init_completion(&priv->start_comp);
1485
1486         err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1487                                          priv->channel);
1488         if (err)
1489                 return err;
1490
1491         if (!wait_for_completion_timeout(&priv->start_comp,
1492                                          msecs_to_jiffies(START_TIMEOUT)))
1493                 return -ETIMEDOUT;
1494
1495         return 0;
1496 }
1497
1498 static int kvaser_usb_open(struct net_device *netdev)
1499 {
1500         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1501         struct kvaser_usb *dev = priv->dev;
1502         int err;
1503
1504         err = open_candev(netdev);
1505         if (err)
1506                 return err;
1507
1508         err = kvaser_usb_setup_rx_urbs(dev);
1509         if (err)
1510                 goto error;
1511
1512         err = kvaser_usb_set_opt_mode(priv);
1513         if (err)
1514                 goto error;
1515
1516         err = kvaser_usb_start_chip(priv);
1517         if (err) {
1518                 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1519                 goto error;
1520         }
1521
1522         priv->can.state = CAN_STATE_ERROR_ACTIVE;
1523
1524         return 0;
1525
1526 error:
1527         close_candev(netdev);
1528         return err;
1529 }
1530
1531 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
1532 {
1533         int i, max_tx_urbs;
1534
1535         max_tx_urbs = priv->dev->max_tx_urbs;
1536
1537         priv->active_tx_contexts = 0;
1538         for (i = 0; i < max_tx_urbs; i++)
1539                 priv->tx_contexts[i].echo_index = max_tx_urbs;
1540 }
1541
1542 /* This method might sleep. Do not call it in the atomic context
1543  * of URB completions.
1544  */
1545 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
1546 {
1547         usb_kill_anchored_urbs(&priv->tx_submitted);
1548         kvaser_usb_reset_tx_urb_contexts(priv);
1549 }
1550
1551 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1552 {
1553         int i;
1554
1555         usb_kill_anchored_urbs(&dev->rx_submitted);
1556
1557         for (i = 0; i < MAX_RX_URBS; i++)
1558                 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1559                                   dev->rxbuf[i],
1560                                   dev->rxbuf_dma[i]);
1561
1562         for (i = 0; i < dev->nchannels; i++) {
1563                 struct kvaser_usb_net_priv *priv = dev->nets[i];
1564
1565                 if (priv)
1566                         kvaser_usb_unlink_tx_urbs(priv);
1567         }
1568 }
1569
1570 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1571 {
1572         int err;
1573
1574         init_completion(&priv->stop_comp);
1575
1576         err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1577                                          priv->channel);
1578         if (err)
1579                 return err;
1580
1581         if (!wait_for_completion_timeout(&priv->stop_comp,
1582                                          msecs_to_jiffies(STOP_TIMEOUT)))
1583                 return -ETIMEDOUT;
1584
1585         return 0;
1586 }
1587
1588 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1589 {
1590         struct kvaser_msg *msg;
1591         int rc;
1592
1593         msg = kzalloc(sizeof(*msg), GFP_KERNEL);
1594         if (!msg)
1595                 return -ENOMEM;
1596
1597         msg->id = CMD_FLUSH_QUEUE;
1598         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1599         msg->u.flush_queue.channel = priv->channel;
1600         msg->u.flush_queue.flags = 0x00;
1601
1602         rc = kvaser_usb_send_msg(priv->dev, msg);
1603
1604         kfree(msg);
1605         return rc;
1606 }
1607
1608 static int kvaser_usb_close(struct net_device *netdev)
1609 {
1610         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1611         struct kvaser_usb *dev = priv->dev;
1612         int err;
1613
1614         netif_stop_queue(netdev);
1615
1616         err = kvaser_usb_flush_queue(priv);
1617         if (err)
1618                 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1619
1620         err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel);
1621         if (err)
1622                 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1623
1624         err = kvaser_usb_stop_chip(priv);
1625         if (err)
1626                 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1627
1628         /* reset tx contexts */
1629         kvaser_usb_unlink_tx_urbs(priv);
1630
1631         priv->can.state = CAN_STATE_STOPPED;
1632         close_candev(priv->netdev);
1633
1634         return 0;
1635 }
1636
1637 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1638 {
1639         struct kvaser_usb_tx_urb_context *context = urb->context;
1640         struct kvaser_usb_net_priv *priv;
1641         struct net_device *netdev;
1642
1643         if (WARN_ON(!context))
1644                 return;
1645
1646         priv = context->priv;
1647         netdev = priv->netdev;
1648
1649         kfree(urb->transfer_buffer);
1650
1651         if (!netif_device_present(netdev))
1652                 return;
1653
1654         if (urb->status)
1655                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1656 }
1657
1658 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1659                                          struct net_device *netdev)
1660 {
1661         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1662         struct kvaser_usb *dev = priv->dev;
1663         struct net_device_stats *stats = &netdev->stats;
1664         struct can_frame *cf = (struct can_frame *)skb->data;
1665         struct kvaser_usb_tx_urb_context *context = NULL;
1666         struct urb *urb;
1667         void *buf;
1668         struct kvaser_msg *msg;
1669         int i, err, ret = NETDEV_TX_OK;
1670         u8 *msg_tx_can_flags = NULL;            /* GCC */
1671         unsigned long flags;
1672
1673         if (can_dropped_invalid_skb(netdev, skb))
1674                 return NETDEV_TX_OK;
1675
1676         urb = usb_alloc_urb(0, GFP_ATOMIC);
1677         if (!urb) {
1678                 netdev_err(netdev, "No memory left for URBs\n");
1679                 stats->tx_dropped++;
1680                 dev_kfree_skb(skb);
1681                 return NETDEV_TX_OK;
1682         }
1683
1684         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1685         if (!buf) {
1686                 stats->tx_dropped++;
1687                 dev_kfree_skb(skb);
1688                 goto freeurb;
1689         }
1690
1691         msg = buf;
1692         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1693         msg->u.tx_can.channel = priv->channel;
1694
1695         switch (dev->family) {
1696         case KVASER_LEAF:
1697                 msg_tx_can_flags = &msg->u.tx_can.leaf.flags;
1698                 break;
1699         case KVASER_USBCAN:
1700                 msg_tx_can_flags = &msg->u.tx_can.usbcan.flags;
1701                 break;
1702         }
1703
1704         *msg_tx_can_flags = 0;
1705
1706         if (cf->can_id & CAN_EFF_FLAG) {
1707                 msg->id = CMD_TX_EXT_MESSAGE;
1708                 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1709                 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1710                 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1711                 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1712                 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1713         } else {
1714                 msg->id = CMD_TX_STD_MESSAGE;
1715                 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1716                 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1717         }
1718
1719         msg->u.tx_can.msg[5] = cf->can_dlc;
1720         memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1721
1722         if (cf->can_id & CAN_RTR_FLAG)
1723                 *msg_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
1724
1725         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1726         for (i = 0; i < dev->max_tx_urbs; i++) {
1727                 if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
1728                         context = &priv->tx_contexts[i];
1729
1730                         context->echo_index = i;
1731                         can_put_echo_skb(skb, netdev, context->echo_index);
1732                         ++priv->active_tx_contexts;
1733                         if (priv->active_tx_contexts >= dev->max_tx_urbs)
1734                                 netif_stop_queue(netdev);
1735
1736                         break;
1737                 }
1738         }
1739         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1740
1741         /* This should never happen; it implies a flow control bug */
1742         if (!context) {
1743                 netdev_warn(netdev, "cannot find free context\n");
1744
1745                 kfree(buf);
1746                 ret =  NETDEV_TX_BUSY;
1747                 goto freeurb;
1748         }
1749
1750         context->priv = priv;
1751         context->dlc = cf->can_dlc;
1752
1753         msg->u.tx_can.tid = context->echo_index;
1754
1755         usb_fill_bulk_urb(urb, dev->udev,
1756                           usb_sndbulkpipe(dev->udev,
1757                                           dev->bulk_out->bEndpointAddress),
1758                           buf, msg->len,
1759                           kvaser_usb_write_bulk_callback, context);
1760         usb_anchor_urb(urb, &priv->tx_submitted);
1761
1762         err = usb_submit_urb(urb, GFP_ATOMIC);
1763         if (unlikely(err)) {
1764                 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1765
1766                 can_free_echo_skb(netdev, context->echo_index);
1767                 context->echo_index = dev->max_tx_urbs;
1768                 --priv->active_tx_contexts;
1769                 netif_wake_queue(netdev);
1770
1771                 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1772
1773                 usb_unanchor_urb(urb);
1774                 kfree(buf);
1775
1776                 stats->tx_dropped++;
1777
1778                 if (err == -ENODEV)
1779                         netif_device_detach(netdev);
1780                 else
1781                         netdev_warn(netdev, "Failed tx_urb %d\n", err);
1782
1783                 goto freeurb;
1784         }
1785
1786         ret = NETDEV_TX_OK;
1787
1788 freeurb:
1789         usb_free_urb(urb);
1790         return ret;
1791 }
1792
1793 static const struct net_device_ops kvaser_usb_netdev_ops = {
1794         .ndo_open = kvaser_usb_open,
1795         .ndo_stop = kvaser_usb_close,
1796         .ndo_start_xmit = kvaser_usb_start_xmit,
1797         .ndo_change_mtu = can_change_mtu,
1798 };
1799
1800 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1801         .name = "kvaser_usb",
1802         .tseg1_min = KVASER_USB_TSEG1_MIN,
1803         .tseg1_max = KVASER_USB_TSEG1_MAX,
1804         .tseg2_min = KVASER_USB_TSEG2_MIN,
1805         .tseg2_max = KVASER_USB_TSEG2_MAX,
1806         .sjw_max = KVASER_USB_SJW_MAX,
1807         .brp_min = KVASER_USB_BRP_MIN,
1808         .brp_max = KVASER_USB_BRP_MAX,
1809         .brp_inc = KVASER_USB_BRP_INC,
1810 };
1811
1812 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1813 {
1814         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1815         struct can_bittiming *bt = &priv->can.bittiming;
1816         struct kvaser_usb *dev = priv->dev;
1817         struct kvaser_msg *msg;
1818         int rc;
1819
1820         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1821         if (!msg)
1822                 return -ENOMEM;
1823
1824         msg->id = CMD_SET_BUS_PARAMS;
1825         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1826         msg->u.busparams.channel = priv->channel;
1827         msg->u.busparams.tid = 0xff;
1828         msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1829         msg->u.busparams.sjw = bt->sjw;
1830         msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1831         msg->u.busparams.tseg2 = bt->phase_seg2;
1832
1833         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1834                 msg->u.busparams.no_samp = 3;
1835         else
1836                 msg->u.busparams.no_samp = 1;
1837
1838         rc = kvaser_usb_send_msg(dev, msg);
1839
1840         kfree(msg);
1841         return rc;
1842 }
1843
1844 static int kvaser_usb_set_mode(struct net_device *netdev,
1845                                enum can_mode mode)
1846 {
1847         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1848         int err;
1849
1850         switch (mode) {
1851         case CAN_MODE_START:
1852                 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1853                 if (err)
1854                         return err;
1855                 break;
1856         default:
1857                 return -EOPNOTSUPP;
1858         }
1859
1860         return 0;
1861 }
1862
1863 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1864                                        struct can_berr_counter *bec)
1865 {
1866         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1867
1868         *bec = priv->bec;
1869
1870         return 0;
1871 }
1872
1873 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1874 {
1875         int i;
1876
1877         for (i = 0; i < dev->nchannels; i++) {
1878                 if (!dev->nets[i])
1879                         continue;
1880
1881                 unregister_candev(dev->nets[i]->netdev);
1882         }
1883
1884         kvaser_usb_unlink_all_urbs(dev);
1885
1886         for (i = 0; i < dev->nchannels; i++) {
1887                 if (!dev->nets[i])
1888                         continue;
1889
1890                 free_candev(dev->nets[i]->netdev);
1891         }
1892 }
1893
1894 static int kvaser_usb_init_one(struct usb_interface *intf,
1895                                const struct usb_device_id *id, int channel)
1896 {
1897         struct kvaser_usb *dev = usb_get_intfdata(intf);
1898         struct net_device *netdev;
1899         struct kvaser_usb_net_priv *priv;
1900         int err;
1901
1902         err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
1903         if (err)
1904                 return err;
1905
1906         netdev = alloc_candev(sizeof(*priv) +
1907                               dev->max_tx_urbs * sizeof(*priv->tx_contexts),
1908                               dev->max_tx_urbs);
1909         if (!netdev) {
1910                 dev_err(&intf->dev, "Cannot alloc candev\n");
1911                 return -ENOMEM;
1912         }
1913
1914         priv = netdev_priv(netdev);
1915
1916         init_usb_anchor(&priv->tx_submitted);
1917         init_completion(&priv->start_comp);
1918         init_completion(&priv->stop_comp);
1919
1920         priv->dev = dev;
1921         priv->netdev = netdev;
1922         priv->channel = channel;
1923
1924         spin_lock_init(&priv->tx_contexts_lock);
1925         kvaser_usb_reset_tx_urb_contexts(priv);
1926
1927         priv->can.state = CAN_STATE_STOPPED;
1928         priv->can.clock.freq = CAN_USB_CLOCK;
1929         priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1930         priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1931         priv->can.do_set_mode = kvaser_usb_set_mode;
1932         if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1933                 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1934         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1935         if (id->driver_info & KVASER_HAS_SILENT_MODE)
1936                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1937
1938         netdev->flags |= IFF_ECHO;
1939
1940         netdev->netdev_ops = &kvaser_usb_netdev_ops;
1941
1942         SET_NETDEV_DEV(netdev, &intf->dev);
1943         netdev->dev_id = channel;
1944
1945         dev->nets[channel] = priv;
1946
1947         err = register_candev(netdev);
1948         if (err) {
1949                 dev_err(&intf->dev, "Failed to register can device\n");
1950                 free_candev(netdev);
1951                 dev->nets[channel] = NULL;
1952                 return err;
1953         }
1954
1955         netdev_dbg(netdev, "device registered\n");
1956
1957         return 0;
1958 }
1959
1960 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1961                                     struct usb_endpoint_descriptor **in,
1962                                     struct usb_endpoint_descriptor **out)
1963 {
1964         const struct usb_host_interface *iface_desc;
1965         struct usb_endpoint_descriptor *endpoint;
1966         int i;
1967
1968         iface_desc = &intf->altsetting[0];
1969
1970         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1971                 endpoint = &iface_desc->endpoint[i].desc;
1972
1973                 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1974                         *in = endpoint;
1975
1976                 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1977                         *out = endpoint;
1978
1979                 /* use first bulk endpoint for in and out */
1980                 if (*in && *out)
1981                         return 0;
1982         }
1983
1984         return -ENODEV;
1985 }
1986
1987 static int kvaser_usb_probe(struct usb_interface *intf,
1988                             const struct usb_device_id *id)
1989 {
1990         struct kvaser_usb *dev;
1991         int err = -ENOMEM;
1992         int i, retry = 3;
1993
1994         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1995         if (!dev)
1996                 return -ENOMEM;
1997
1998         if (kvaser_is_leaf(id)) {
1999                 dev->family = KVASER_LEAF;
2000         } else if (kvaser_is_usbcan(id)) {
2001                 dev->family = KVASER_USBCAN;
2002         } else {
2003                 dev_err(&intf->dev,
2004                         "Product ID (%d) does not belong to any known Kvaser USB family",
2005                         id->idProduct);
2006                 return -ENODEV;
2007         }
2008
2009         err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
2010         if (err) {
2011                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
2012                 return err;
2013         }
2014
2015         dev->udev = interface_to_usbdev(intf);
2016
2017         init_usb_anchor(&dev->rx_submitted);
2018
2019         usb_set_intfdata(intf, dev);
2020
2021         /* On some x86 laptops, plugging a Kvaser device again after
2022          * an unplug makes the firmware always ignore the very first
2023          * command. For such a case, provide some room for retries
2024          * instead of completely exiting the driver.
2025          */
2026         do {
2027                 err = kvaser_usb_get_software_info(dev);
2028         } while (--retry && err == -ETIMEDOUT);
2029
2030         if (err) {
2031                 dev_err(&intf->dev,
2032                         "Cannot get software infos, error %d\n", err);
2033                 return err;
2034         }
2035
2036         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
2037                 ((dev->fw_version >> 24) & 0xff),
2038                 ((dev->fw_version >> 16) & 0xff),
2039                 (dev->fw_version & 0xffff));
2040
2041         dev_dbg(&intf->dev, "Max oustanding tx = %d URBs\n", dev->max_tx_urbs);
2042
2043         err = kvaser_usb_get_card_info(dev);
2044         if (err) {
2045                 dev_err(&intf->dev,
2046                         "Cannot get card infos, error %d\n", err);
2047                 return err;
2048         }
2049
2050         for (i = 0; i < dev->nchannels; i++) {
2051                 err = kvaser_usb_init_one(intf, id, i);
2052                 if (err) {
2053                         kvaser_usb_remove_interfaces(dev);
2054                         return err;
2055                 }
2056         }
2057
2058         return 0;
2059 }
2060
2061 static void kvaser_usb_disconnect(struct usb_interface *intf)
2062 {
2063         struct kvaser_usb *dev = usb_get_intfdata(intf);
2064
2065         usb_set_intfdata(intf, NULL);
2066
2067         if (!dev)
2068                 return;
2069
2070         kvaser_usb_remove_interfaces(dev);
2071 }
2072
2073 static struct usb_driver kvaser_usb_driver = {
2074         .name = "kvaser_usb",
2075         .probe = kvaser_usb_probe,
2076         .disconnect = kvaser_usb_disconnect,
2077         .id_table = kvaser_usb_table,
2078 };
2079
2080 module_usb_driver(kvaser_usb_driver);
2081
2082 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
2083 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
2084 MODULE_LICENSE("GPL v2");