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