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 KVASER_USB_CAN_CLOCK_8MHZ       8000000
  35 #define KVASER_USB_CAN_CLOCK_16MHZ      16000000
  36 #define KVASER_USB_CAN_CLOCK_24MHZ      24000000
  37 #define KVASER_USB_CAN_CLOCK_32MHZ      32000000
  38 #define MAX_NET_DEVICES                 3
  39 #define MAX_USBCAN_NET_DEVICES          2
  40
  41 /* Kvaser Leaf USB devices */
  42 #define KVASER_VENDOR_ID                0x0bfd
  43 #define USB_LEAF_DEVEL_PRODUCT_ID       10
  44 #define USB_LEAF_LITE_PRODUCT_ID        11
  45 #define USB_LEAF_PRO_PRODUCT_ID         12
  46 #define USB_LEAF_SPRO_PRODUCT_ID        14
  47 #define USB_LEAF_PRO_LS_PRODUCT_ID      15
  48 #define USB_LEAF_PRO_SWC_PRODUCT_ID     16
  49 #define USB_LEAF_PRO_LIN_PRODUCT_ID     17
  50 #define USB_LEAF_SPRO_LS_PRODUCT_ID     18
  51 #define USB_LEAF_SPRO_SWC_PRODUCT_ID    19
  52 #define USB_MEMO2_DEVEL_PRODUCT_ID      22
  53 #define USB_MEMO2_HSHS_PRODUCT_ID       23
  54 #define USB_UPRO_HSHS_PRODUCT_ID        24
  55 #define USB_LEAF_LITE_GI_PRODUCT_ID     25
  56 #define USB_LEAF_PRO_OBDII_PRODUCT_ID   26
  57 #define USB_MEMO2_HSLS_PRODUCT_ID       27
  58 #define USB_LEAF_LITE_CH_PRODUCT_ID     28
  59 #define USB_BLACKBIRD_SPRO_PRODUCT_ID   29
  60 #define USB_OEM_MERCURY_PRODUCT_ID      34
  61 #define USB_OEM_LEAF_PRODUCT_ID         35
  62 #define USB_CAN_R_PRODUCT_ID            39
  63 #define USB_LEAF_LITE_V2_PRODUCT_ID     288
  64 #define USB_MINI_PCIE_HS_PRODUCT_ID     289
  65 #define USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID 290
  66 #define USB_USBCAN_LIGHT_2HS_PRODUCT_ID 291
  67 #define USB_MINI_PCIE_2HS_PRODUCT_ID    292
  68
  69 static inline bool kvaser_is_leaf(const struct usb_device_id *id)
  70 {
  71         return id->idProduct >= USB_LEAF_DEVEL_PRODUCT_ID &&
  72                id->idProduct <= USB_MINI_PCIE_2HS_PRODUCT_ID;
  73 }
  74
  75 /* Kvaser USBCan-II devices */
  76 #define USB_USBCAN_REVB_PRODUCT_ID      2
  77 #define USB_VCI2_PRODUCT_ID             3
  78 #define USB_USBCAN2_PRODUCT_ID          4
  79 #define USB_MEMORATOR_PRODUCT_ID        5
  80
  81 static inline bool kvaser_is_usbcan(const struct usb_device_id *id)
  82 {
  83         return id->idProduct >= USB_USBCAN_REVB_PRODUCT_ID &&
  84                id->idProduct <= USB_MEMORATOR_PRODUCT_ID;
  85 }
  86
  87 /* USB devices features */
  88 #define KVASER_HAS_SILENT_MODE          BIT(0)
  89 #define KVASER_HAS_TXRX_ERRORS          BIT(1)
  90
  91 /* Message header size */
  92 #define MSG_HEADER_LEN                  2
  93
  94 /* Can message flags */
  95 #define MSG_FLAG_ERROR_FRAME            BIT(0)
  96 #define MSG_FLAG_OVERRUN                BIT(1)
  97 #define MSG_FLAG_NERR                   BIT(2)
  98 #define MSG_FLAG_WAKEUP                 BIT(3)
  99 #define MSG_FLAG_REMOTE_FRAME           BIT(4)
 100 #define MSG_FLAG_RESERVED               BIT(5)
 101 #define MSG_FLAG_TX_ACK                 BIT(6)
 102 #define MSG_FLAG_TX_REQUEST             BIT(7)
 103
 104 /* Can states (M16C CxSTRH register) */
 105 #define M16C_STATE_BUS_RESET            BIT(0)
 106 #define M16C_STATE_BUS_ERROR            BIT(4)
 107 #define M16C_STATE_BUS_PASSIVE          BIT(5)
 108 #define M16C_STATE_BUS_OFF              BIT(6)
 109
 110 /* Can msg ids */
 111 #define CMD_RX_STD_MESSAGE              12
 112 #define CMD_TX_STD_MESSAGE              13
 113 #define CMD_RX_EXT_MESSAGE              14
 114 #define CMD_TX_EXT_MESSAGE              15
 115 #define CMD_SET_BUS_PARAMS              16
 116 #define CMD_GET_BUS_PARAMS              17
 117 #define CMD_GET_BUS_PARAMS_REPLY        18
 118 #define CMD_GET_CHIP_STATE              19
 119 #define CMD_CHIP_STATE_EVENT            20
 120 #define CMD_SET_CTRL_MODE               21
 121 #define CMD_GET_CTRL_MODE               22
 122 #define CMD_GET_CTRL_MODE_REPLY         23
 123 #define CMD_RESET_CHIP                  24
 124 #define CMD_RESET_CARD                  25
 125 #define CMD_START_CHIP                  26
 126 #define CMD_START_CHIP_REPLY            27
 127 #define CMD_STOP_CHIP                   28
 128 #define CMD_STOP_CHIP_REPLY             29
 129
 130 #define CMD_LEAF_GET_CARD_INFO2         32
 131 #define CMD_USBCAN_RESET_CLOCK          32
 132 #define CMD_USBCAN_CLOCK_OVERFLOW_EVENT 33
 133
 134 #define CMD_GET_CARD_INFO               34
 135 #define CMD_GET_CARD_INFO_REPLY         35
 136 #define CMD_GET_SOFTWARE_INFO           38
 137 #define CMD_GET_SOFTWARE_INFO_REPLY     39
 138 #define CMD_ERROR_EVENT                 45
 139 #define CMD_FLUSH_QUEUE                 48
 140 #define CMD_RESET_ERROR_COUNTER         49
 141 #define CMD_TX_ACKNOWLEDGE              50
 142 #define CMD_CAN_ERROR_EVENT             51
 143 #define CMD_FLUSH_QUEUE_REPLY           68
 144
 145 #define CMD_LEAF_USB_THROTTLE           77
 146 #define CMD_LEAF_LOG_MESSAGE            106
 147
 148 /* Leaf frequency options */
 149 #define KVASER_USB_LEAF_SWOPTION_FREQ_MASK 0x60
 150 #define KVASER_USB_LEAF_SWOPTION_FREQ_16_MHZ_CLK 0
 151 #define KVASER_USB_LEAF_SWOPTION_FREQ_32_MHZ_CLK BIT(5)
 152 #define KVASER_USB_LEAF_SWOPTION_FREQ_24_MHZ_CLK BIT(6)
 153
 154 /* error factors */
 155 #define M16C_EF_ACKE                    BIT(0)
 156 #define M16C_EF_CRCE                    BIT(1)
 157 #define M16C_EF_FORME                   BIT(2)
 158 #define M16C_EF_STFE                    BIT(3)
 159 #define M16C_EF_BITE0                   BIT(4)
 160 #define M16C_EF_BITE1                   BIT(5)
 161 #define M16C_EF_RCVE                    BIT(6)
 162 #define M16C_EF_TRE                     BIT(7)
 163
 164 /* Only Leaf-based devices can report M16C error factors,
 165  * thus define our own error status flags for USBCANII
 166  */
 167 #define USBCAN_ERROR_STATE_NONE         0
 168 #define USBCAN_ERROR_STATE_TX_ERROR     BIT(0)
 169 #define USBCAN_ERROR_STATE_RX_ERROR     BIT(1)
 170 #define USBCAN_ERROR_STATE_BUSERROR     BIT(2)
 171
 172 /* bittiming parameters */
 173 #define KVASER_USB_TSEG1_MIN            1
 174 #define KVASER_USB_TSEG1_MAX            16
 175 #define KVASER_USB_TSEG2_MIN            1
 176 #define KVASER_USB_TSEG2_MAX            8
 177 #define KVASER_USB_SJW_MAX              4
 178 #define KVASER_USB_BRP_MIN              1
 179 #define KVASER_USB_BRP_MAX              64
 180 #define KVASER_USB_BRP_INC              1
 181
 182 /* ctrl modes */
 183 #define KVASER_CTRL_MODE_NORMAL         1
 184 #define KVASER_CTRL_MODE_SILENT         2
 185 #define KVASER_CTRL_MODE_SELFRECEPTION  3
 186 #define KVASER_CTRL_MODE_OFF            4
 187
 188 /* Extended CAN identifier flag */
 189 #define KVASER_EXTENDED_FRAME           BIT(31)
 190
 191 /* Kvaser USB CAN dongles are divided into two major families:
 192  * - Leaf: Based on Renesas M32C, running firmware labeled as 'filo'
 193  * - UsbcanII: Based on Renesas M16C, running firmware labeled as 'helios'
 194  */
 195 enum kvaser_usb_family {
 196         KVASER_LEAF,
 197         KVASER_USBCAN,
 198 };
 199
 200 struct kvaser_msg_simple {
 201         u8 tid;
 202         u8 channel;
 203 } __packed;
 204
 205 struct kvaser_msg_cardinfo {
 206         u8 tid;
 207         u8 nchannels;
 208         union {
 209                 struct {
 210                         __le32 serial_number;
 211                         __le32 padding;
 212                 } __packed leaf0;
 213                 struct {
 214                         __le32 serial_number_low;
 215                         __le32 serial_number_high;
 216                 } __packed usbcan0;
 217         } __packed;
 218         __le32 clock_resolution;
 219         __le32 mfgdate;
 220         u8 ean[8];
 221         u8 hw_revision;
 222         union {
 223                 struct {
 224                         u8 usb_hs_mode;
 225                 } __packed leaf1;
 226                 struct {
 227                         u8 padding;
 228                 } __packed usbcan1;
 229         } __packed;
 230         __le16 padding;
 231 } __packed;
 232
 233 struct kvaser_msg_cardinfo2 {
 234         u8 tid;
 235         u8 reserved;
 236         u8 pcb_id[24];
 237         __le32 oem_unlock_code;
 238 } __packed;
 239
 240 struct leaf_msg_softinfo {
 241         u8 tid;
 242         u8 padding0;
 243         __le32 sw_options;
 244         __le32 fw_version;
 245         __le16 max_outstanding_tx;
 246         __le16 padding1[9];
 247 } __packed;
 248
 249 struct usbcan_msg_softinfo {
 250         u8 tid;
 251         u8 fw_name[5];
 252         __le16 max_outstanding_tx;
 253         u8 padding[6];
 254         __le32 fw_version;
 255         __le16 checksum;
 256         __le16 sw_options;
 257 } __packed;
 258
 259 struct kvaser_msg_busparams {
 260         u8 tid;
 261         u8 channel;
 262         __le32 bitrate;
 263         u8 tseg1;
 264         u8 tseg2;
 265         u8 sjw;
 266         u8 no_samp;
 267 } __packed;
 268
 269 struct kvaser_msg_tx_can {
 270         u8 channel;
 271         u8 tid;
 272         u8 msg[14];
 273         union {
 274                 struct {
 275                         u8 padding;
 276                         u8 flags;
 277                 } __packed leaf;
 278                 struct {
 279                         u8 flags;
 280                         u8 padding;
 281                 } __packed usbcan;
 282         } __packed;
 283 } __packed;
 284
 285 struct kvaser_msg_rx_can_header {
 286         u8 channel;
 287         u8 flag;
 288 } __packed;
 289
 290 struct leaf_msg_rx_can {
 291         u8 channel;
 292         u8 flag;
 293
 294         __le16 time[3];
 295         u8 msg[14];
 296 } __packed;
 297
 298 struct usbcan_msg_rx_can {
 299         u8 channel;
 300         u8 flag;
 301
 302         u8 msg[14];
 303         __le16 time;
 304 } __packed;
 305
 306 struct leaf_msg_chip_state_event {
 307         u8 tid;
 308         u8 channel;
 309
 310         __le16 time[3];
 311         u8 tx_errors_count;
 312         u8 rx_errors_count;
 313
 314         u8 status;
 315         u8 padding[3];
 316 } __packed;
 317
 318 struct usbcan_msg_chip_state_event {
 319         u8 tid;
 320         u8 channel;
 321
 322         u8 tx_errors_count;
 323         u8 rx_errors_count;
 324         __le16 time;
 325
 326         u8 status;
 327         u8 padding[3];
 328 } __packed;
 329
 330 struct kvaser_msg_tx_acknowledge_header {
 331         u8 channel;
 332         u8 tid;
 333 } __packed;
 334
 335 struct leaf_msg_tx_acknowledge {
 336         u8 channel;
 337         u8 tid;
 338
 339         __le16 time[3];
 340         u8 flags;
 341         u8 time_offset;
 342 } __packed;
 343
 344 struct usbcan_msg_tx_acknowledge {
 345         u8 channel;
 346         u8 tid;
 347
 348         __le16 time;
 349         __le16 padding;
 350 } __packed;
 351
 352 struct leaf_msg_error_event {
 353         u8 tid;
 354         u8 flags;
 355         __le16 time[3];
 356         u8 channel;
 357         u8 padding;
 358         u8 tx_errors_count;
 359         u8 rx_errors_count;
 360         u8 status;
 361         u8 error_factor;
 362 } __packed;
 363
 364 struct usbcan_msg_error_event {
 365         u8 tid;
 366         u8 padding;
 367         u8 tx_errors_count_ch0;
 368         u8 rx_errors_count_ch0;
 369         u8 tx_errors_count_ch1;
 370         u8 rx_errors_count_ch1;
 371         u8 status_ch0;
 372         u8 status_ch1;
 373         __le16 time;
 374 } __packed;
 375
 376 struct kvaser_msg_ctrl_mode {
 377         u8 tid;
 378         u8 channel;
 379         u8 ctrl_mode;
 380         u8 padding[3];
 381 } __packed;
 382
 383 struct kvaser_msg_flush_queue {
 384         u8 tid;
 385         u8 channel;
 386         u8 flags;
 387         u8 padding[3];
 388 } __packed;
 389
 390 struct leaf_msg_log_message {
 391         u8 channel;
 392         u8 flags;
 393         __le16 time[3];
 394         u8 dlc;
 395         u8 time_offset;
 396         __le32 id;
 397         u8 data[8];
 398 } __packed;
 399
 400 struct kvaser_msg {
 401         u8 len;
 402         u8 id;
 403         union   {
 404                 struct kvaser_msg_simple simple;
 405                 struct kvaser_msg_cardinfo cardinfo;
 406                 struct kvaser_msg_cardinfo2 cardinfo2;
 407                 struct kvaser_msg_busparams busparams;
 408
 409                 struct kvaser_msg_rx_can_header rx_can_header;
 410                 struct kvaser_msg_tx_acknowledge_header tx_acknowledge_header;
 411
 412                 union {
 413                         struct leaf_msg_softinfo softinfo;
 414                         struct leaf_msg_rx_can rx_can;
 415                         struct leaf_msg_chip_state_event chip_state_event;
 416                         struct leaf_msg_tx_acknowledge tx_acknowledge;
 417                         struct leaf_msg_error_event error_event;
 418                         struct leaf_msg_log_message log_message;
 419                 } __packed leaf;
 420
 421                 union {
 422                         struct usbcan_msg_softinfo softinfo;
 423                         struct usbcan_msg_rx_can rx_can;
 424                         struct usbcan_msg_chip_state_event chip_state_event;
 425                         struct usbcan_msg_tx_acknowledge tx_acknowledge;
 426                         struct usbcan_msg_error_event error_event;
 427                 } __packed usbcan;
 428
 429                 struct kvaser_msg_tx_can tx_can;
 430                 struct kvaser_msg_ctrl_mode ctrl_mode;
 431                 struct kvaser_msg_flush_queue flush_queue;
 432         } u;
 433 } __packed;
 434
 435 /* Summary of a kvaser error event, for a unified Leaf/Usbcan error
 436  * handling. Some discrepancies between the two families exist:
 437  *
 438  * - USBCAN firmware does not report M16C "error factors"
 439  * - USBCAN controllers has difficulties reporting if the raised error
 440  *   event is for ch0 or ch1. They leave such arbitration to the OS
 441  *   driver by letting it compare error counters with previous values
 442  *   and decide the error event's channel. Thus for USBCAN, the channel
 443  *   field is only advisory.
 444  */
 445 struct kvaser_usb_error_summary {
 446         u8 channel, status, txerr, rxerr;
 447         union {
 448                 struct {
 449                         u8 error_factor;
 450                 } leaf;
 451                 struct {
 452                         u8 other_ch_status;
 453                         u8 error_state;
 454                 } usbcan;
 455         };
 456 };
 457
 458 /* Context for an outstanding, not yet ACKed, transmission */
 459 struct kvaser_usb_tx_urb_context {
 460         struct kvaser_usb_net_priv *priv;
 461         u32 echo_index;
 462         int dlc;
 463 };
 464
 465 struct kvaser_usb {
 466         struct usb_device *udev;
 467         struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
 468
 469         struct usb_endpoint_descriptor *bulk_in, *bulk_out;
 470         struct usb_anchor rx_submitted;
 471
 472         /* @max_tx_urbs: Firmware-reported maximum number of outstanding,
 473          * not yet ACKed, transmissions on this device. This value is
 474          * also used as a sentinel for marking free tx contexts.
 475          */
 476         u32 fw_version;
 477         unsigned int nchannels;
 478         unsigned int max_tx_urbs;
 479         enum kvaser_usb_family family;
 480
 481         bool rxinitdone;
 482         void *rxbuf[MAX_RX_URBS];
 483         dma_addr_t rxbuf_dma[MAX_RX_URBS];
 484
 485         struct can_clock clock;
 486 };
 487
 488 struct kvaser_usb_net_priv {
 489         struct can_priv can;
 490         struct can_berr_counter bec;
 491
 492         struct kvaser_usb *dev;
 493         struct net_device *netdev;
 494         int channel;
 495
 496         struct completion start_comp, stop_comp;
 497         struct usb_anchor tx_submitted;
 498
 499         spinlock_t tx_contexts_lock;
 500         int active_tx_contexts;
 501         struct kvaser_usb_tx_urb_context tx_contexts[];
 502 };
 503
 504 static const struct usb_device_id kvaser_usb_table[] = {
 505         /* Leaf family IDs */
 506         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
 507         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
 508         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
 509                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 510                                KVASER_HAS_SILENT_MODE },
 511         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
 512                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 513                                KVASER_HAS_SILENT_MODE },
 514         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
 515                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 516                                KVASER_HAS_SILENT_MODE },
 517         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
 518                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 519                                KVASER_HAS_SILENT_MODE },
 520         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
 521                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 522                                KVASER_HAS_SILENT_MODE },
 523         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
 524                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 525                                KVASER_HAS_SILENT_MODE },
 526         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
 527                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 528                                KVASER_HAS_SILENT_MODE },
 529         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
 530                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 531                                KVASER_HAS_SILENT_MODE },
 532         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
 533                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 534                                KVASER_HAS_SILENT_MODE },
 535         { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
 536                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 537         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
 538         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
 539                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 540                                KVASER_HAS_SILENT_MODE },
 541         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
 542                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 543         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
 544                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 545         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
 546                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 547         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
 548                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 549         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
 550                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 551         { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
 552                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 553         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
 554         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
 555         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID) },
 556         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_2HS_PRODUCT_ID) },
 557         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_2HS_PRODUCT_ID) },
 558
 559         /* USBCANII family IDs */
 560         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
 561                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 562         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
 563                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 564         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
 565                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 566         { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
 567                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 568
 569         { }
 570 };
 571 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
 572
 573 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
 574                                       struct kvaser_msg *msg)
 575 {
 576         int actual_len;
 577
 578         return usb_bulk_msg(dev->udev,
 579                             usb_sndbulkpipe(dev->udev,
 580                                         dev->bulk_out->bEndpointAddress),
 581                             msg, msg->len, &actual_len,
 582                             USB_SEND_TIMEOUT);
 583 }
 584
 585 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
 586                                struct kvaser_msg *msg)
 587 {
 588         struct kvaser_msg *tmp;
 589         void *buf;
 590         int actual_len;
 591         int err;
 592         int pos;
 593         unsigned long to = jiffies + msecs_to_jiffies(USB_RECV_TIMEOUT);
 594
 595         buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
 596         if (!buf)
 597                 return -ENOMEM;
 598
 599         do {
 600                 err = usb_bulk_msg(dev->udev,
 601                                    usb_rcvbulkpipe(dev->udev,
 602                                         dev->bulk_in->bEndpointAddress),
 603                                    buf, RX_BUFFER_SIZE, &actual_len,
 604                                    USB_RECV_TIMEOUT);
 605                 if (err < 0)
 606                         goto end;
 607
 608                 pos = 0;
 609                 while (pos <= actual_len - MSG_HEADER_LEN) {
 610                         tmp = buf + pos;
 611
 612                         /* Handle messages crossing the USB endpoint max packet
 613                          * size boundary. Check kvaser_usb_read_bulk_callback()
 614                          * for further details.
 615                          */
 616                         if (tmp->len == 0) {
 617                                 pos = round_up(pos, le16_to_cpu(dev->bulk_in->
 618                                                                 wMaxPacketSize));
 619                                 continue;
 620                         }
 621
 622                         if (pos + tmp->len > actual_len) {
 623                                 dev_err_ratelimited(dev->udev->dev.parent,
 624                                                     "Format error\n");
 625                                 break;
 626                         }
 627
 628                         if (tmp->id == id) {
 629                                 memcpy(msg, tmp, tmp->len);
 630                                 goto end;
 631                         }
 632
 633                         pos += tmp->len;
 634                 }
 635         } while (time_before(jiffies, to));
 636
 637         err = -EINVAL;
 638
 639 end:
 640         kfree(buf);
 641
 642         return err;
 643 }
 644
 645 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
 646                                       u8 msg_id, int channel)
 647 {
 648         struct kvaser_msg *msg;
 649         int rc;
 650
 651         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 652         if (!msg)
 653                 return -ENOMEM;
 654
 655         msg->id = msg_id;
 656         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 657         msg->u.simple.channel = channel;
 658         msg->u.simple.tid = 0xff;
 659
 660         rc = kvaser_usb_send_msg(dev, msg);
 661
 662         kfree(msg);
 663         return rc;
 664 }
 665
 666 static void kvaser_usb_get_software_info_leaf(struct kvaser_usb *dev,
 667                                               const struct leaf_msg_softinfo *softinfo)
 668 {
 669         u32 sw_options = le32_to_cpu(softinfo->sw_options);
 670
 671         dev->fw_version = le32_to_cpu(softinfo->fw_version);
 672         dev->max_tx_urbs = le16_to_cpu(softinfo->max_outstanding_tx);
 673
 674         switch (sw_options & KVASER_USB_LEAF_SWOPTION_FREQ_MASK) {
 675         case KVASER_USB_LEAF_SWOPTION_FREQ_16_MHZ_CLK:
 676                 dev->clock.freq = KVASER_USB_CAN_CLOCK_16MHZ;
 677                 break;
 678         case KVASER_USB_LEAF_SWOPTION_FREQ_24_MHZ_CLK:
 679                 dev->clock.freq = KVASER_USB_CAN_CLOCK_24MHZ;
 680                 break;
 681         case KVASER_USB_LEAF_SWOPTION_FREQ_32_MHZ_CLK:
 682                 dev->clock.freq = KVASER_USB_CAN_CLOCK_32MHZ;
 683                 break;
 684         }
 685 }
 686
 687 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
 688 {
 689         struct kvaser_msg msg;
 690         int err;
 691
 692         err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
 693         if (err)
 694                 return err;
 695
 696         err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
 697         if (err)
 698                 return err;
 699
 700         switch (dev->family) {
 701         case KVASER_LEAF:
 702                 kvaser_usb_get_software_info_leaf(dev, &msg.u.leaf.softinfo);
 703                 break;
 704         case KVASER_USBCAN:
 705                 dev->fw_version = le32_to_cpu(msg.u.usbcan.softinfo.fw_version);
 706                 dev->max_tx_urbs =
 707                         le16_to_cpu(msg.u.usbcan.softinfo.max_outstanding_tx);
 708                 dev->clock.freq = KVASER_USB_CAN_CLOCK_8MHZ;
 709                 break;
 710         }
 711
 712         return 0;
 713 }
 714
 715 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
 716 {
 717         struct kvaser_msg msg;
 718         int err;
 719
 720         err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
 721         if (err)
 722                 return err;
 723
 724         err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
 725         if (err)
 726                 return err;
 727
 728         dev->nchannels = msg.u.cardinfo.nchannels;
 729         if ((dev->nchannels > MAX_NET_DEVICES) ||
 730             (dev->family == KVASER_USBCAN &&
 731              dev->nchannels > MAX_USBCAN_NET_DEVICES))
 732                 return -EINVAL;
 733
 734         return 0;
 735 }
 736
 737 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
 738                                       const struct kvaser_msg *msg)
 739 {
 740         struct net_device_stats *stats;
 741         struct kvaser_usb_tx_urb_context *context;
 742         struct kvaser_usb_net_priv *priv;
 743         struct sk_buff *skb;
 744         struct can_frame *cf;
 745         unsigned long flags;
 746         u8 channel, tid;
 747
 748         channel = msg->u.tx_acknowledge_header.channel;
 749         tid = msg->u.tx_acknowledge_header.tid;
 750
 751         if (channel >= dev->nchannels) {
 752                 dev_err(dev->udev->dev.parent,
 753                         "Invalid channel number (%d)\n", channel);
 754                 return;
 755         }
 756
 757         priv = dev->nets[channel];
 758
 759         if (!netif_device_present(priv->netdev))
 760                 return;
 761
 762         stats = &priv->netdev->stats;
 763
 764         context = &priv->tx_contexts[tid % dev->max_tx_urbs];
 765
 766         /* Sometimes the state change doesn't come after a bus-off event */
 767         if (priv->can.restart_ms &&
 768             (priv->can.state >= CAN_STATE_BUS_OFF)) {
 769                 skb = alloc_can_err_skb(priv->netdev, &cf);
 770                 if (skb) {
 771                         cf->can_id |= CAN_ERR_RESTARTED;
 772
 773                         stats->rx_packets++;
 774                         stats->rx_bytes += cf->can_dlc;
 775                         netif_rx(skb);
 776                 } else {
 777                         netdev_err(priv->netdev,
 778                                    "No memory left for err_skb\n");
 779                 }
 780
 781                 priv->can.can_stats.restarts++;
 782                 netif_carrier_on(priv->netdev);
 783
 784                 priv->can.state = CAN_STATE_ERROR_ACTIVE;
 785         }
 786
 787         stats->tx_packets++;
 788         stats->tx_bytes += context->dlc;
 789
 790         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 791
 792         can_get_echo_skb(priv->netdev, context->echo_index);
 793         context->echo_index = dev->max_tx_urbs;
 794         --priv->active_tx_contexts;
 795         netif_wake_queue(priv->netdev);
 796
 797         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 798 }
 799
 800 static void kvaser_usb_simple_msg_callback(struct urb *urb)
 801 {
 802         struct net_device *netdev = urb->context;
 803
 804         kfree(urb->transfer_buffer);
 805
 806         if (urb->status)
 807                 netdev_warn(netdev, "urb status received: %d\n",
 808                             urb->status);
 809 }
 810
 811 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
 812                                        u8 msg_id)
 813 {
 814         struct kvaser_usb *dev = priv->dev;
 815         struct net_device *netdev = priv->netdev;
 816         struct kvaser_msg *msg;
 817         struct urb *urb;
 818         void *buf;
 819         int err;
 820
 821         urb = usb_alloc_urb(0, GFP_ATOMIC);
 822         if (!urb)
 823                 return -ENOMEM;
 824
 825         buf = kzalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
 826         if (!buf) {
 827                 usb_free_urb(urb);
 828                 return -ENOMEM;
 829         }
 830
 831         msg = (struct kvaser_msg *)buf;
 832         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 833         msg->id = msg_id;
 834         msg->u.simple.channel = priv->channel;
 835
 836         usb_fill_bulk_urb(urb, dev->udev,
 837                           usb_sndbulkpipe(dev->udev,
 838                                           dev->bulk_out->bEndpointAddress),
 839                           buf, msg->len,
 840                           kvaser_usb_simple_msg_callback, netdev);
 841         usb_anchor_urb(urb, &priv->tx_submitted);
 842
 843         err = usb_submit_urb(urb, GFP_ATOMIC);
 844         if (err) {
 845                 netdev_err(netdev, "Error transmitting URB\n");
 846                 usb_unanchor_urb(urb);
 847                 kfree(buf);
 848                 usb_free_urb(urb);
 849                 return err;
 850         }
 851
 852         usb_free_urb(urb);
 853
 854         return 0;
 855 }
 856
 857 static void kvaser_usb_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
 858                                                  const struct kvaser_usb_error_summary *es,
 859                                                  struct can_frame *cf)
 860 {
 861         struct kvaser_usb *dev = priv->dev;
 862         struct net_device_stats *stats = &priv->netdev->stats;
 863         enum can_state cur_state, new_state, tx_state, rx_state;
 864
 865         netdev_dbg(priv->netdev, "Error status: 0x%02x\n", es->status);
 866
 867         new_state = cur_state = priv->can.state;
 868
 869         if (es->status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET))
 870                 new_state = CAN_STATE_BUS_OFF;
 871         else if (es->status & M16C_STATE_BUS_PASSIVE)
 872                 new_state = CAN_STATE_ERROR_PASSIVE;
 873         else if (es->status & M16C_STATE_BUS_ERROR) {
 874                 /* Guard against spurious error events after a busoff */
 875                 if (cur_state < CAN_STATE_BUS_OFF) {
 876                         if ((es->txerr >= 128) || (es->rxerr >= 128))
 877                                 new_state = CAN_STATE_ERROR_PASSIVE;
 878                         else if ((es->txerr >= 96) || (es->rxerr >= 96))
 879                                 new_state = CAN_STATE_ERROR_WARNING;
 880                         else if (cur_state > CAN_STATE_ERROR_ACTIVE)
 881                                 new_state = CAN_STATE_ERROR_ACTIVE;
 882                 }
 883         }
 884
 885         if (!es->status)
 886                 new_state = CAN_STATE_ERROR_ACTIVE;
 887
 888         if (new_state != cur_state) {
 889                 tx_state = (es->txerr >= es->rxerr) ? new_state : 0;
 890                 rx_state = (es->txerr <= es->rxerr) ? new_state : 0;
 891
 892                 can_change_state(priv->netdev, cf, tx_state, rx_state);
 893         }
 894
 895         if (priv->can.restart_ms &&
 896             (cur_state >= CAN_STATE_BUS_OFF) &&
 897             (new_state < CAN_STATE_BUS_OFF)) {
 898                 priv->can.can_stats.restarts++;
 899         }
 900
 901         switch (dev->family) {
 902         case KVASER_LEAF:
 903                 if (es->leaf.error_factor) {
 904                         priv->can.can_stats.bus_error++;
 905                         stats->rx_errors++;
 906                 }
 907                 break;
 908         case KVASER_USBCAN:
 909                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_TX_ERROR)
 910                         stats->tx_errors++;
 911                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_RX_ERROR)
 912                         stats->rx_errors++;
 913                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
 914                         priv->can.can_stats.bus_error++;
 915                 }
 916                 break;
 917         }
 918
 919         priv->bec.txerr = es->txerr;
 920         priv->bec.rxerr = es->rxerr;
 921 }
 922
 923 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
 924                                 const struct kvaser_usb_error_summary *es)
 925 {
 926         struct can_frame *cf, tmp_cf = { .can_id = CAN_ERR_FLAG, .can_dlc = CAN_ERR_DLC };
 927         struct sk_buff *skb;
 928         struct net_device_stats *stats;
 929         struct kvaser_usb_net_priv *priv;
 930         enum can_state old_state, new_state;
 931
 932         if (es->channel >= dev->nchannels) {
 933                 dev_err(dev->udev->dev.parent,
 934                         "Invalid channel number (%d)\n", es->channel);
 935                 return;
 936         }
 937
 938         priv = dev->nets[es->channel];
 939         stats = &priv->netdev->stats;
 940
 941         /* Update all of the can interface's state and error counters before
 942          * trying any memory allocation that can actually fail with -ENOMEM.
 943          *
 944          * We send a temporary stack-allocated error can frame to
 945          * can_change_state() for the very same reason.
 946          *
 947          * TODO: Split can_change_state() responsibility between updating the
 948          * can interface's state and counters, and the setting up of can error
 949          * frame ID and data to userspace. Remove stack allocation afterwards.
 950          */
 951         old_state = priv->can.state;
 952         kvaser_usb_rx_error_update_can_state(priv, es, &tmp_cf);
 953         new_state = priv->can.state;
 954
 955         skb = alloc_can_err_skb(priv->netdev, &cf);
 956         if (!skb) {
 957                 stats->rx_dropped++;
 958                 return;
 959         }
 960         memcpy(cf, &tmp_cf, sizeof(*cf));
 961
 962         if (new_state != old_state) {
 963                 if (es->status &
 964                     (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
 965                         if (!priv->can.restart_ms)
 966                                 kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
 967                         netif_carrier_off(priv->netdev);
 968                 }
 969
 970                 if (priv->can.restart_ms &&
 971                     (old_state >= CAN_STATE_BUS_OFF) &&
 972                     (new_state < CAN_STATE_BUS_OFF)) {
 973                         cf->can_id |= CAN_ERR_RESTARTED;
 974                         netif_carrier_on(priv->netdev);
 975                 }
 976         }
 977
 978         switch (dev->family) {
 979         case KVASER_LEAF:
 980                 if (es->leaf.error_factor) {
 981                         cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
 982
 983                         if (es->leaf.error_factor & M16C_EF_ACKE)
 984                                 cf->data[3] = CAN_ERR_PROT_LOC_ACK;
 985                         if (es->leaf.error_factor & M16C_EF_CRCE)
 986                                 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 987                         if (es->leaf.error_factor & M16C_EF_FORME)
 988                                 cf->data[2] |= CAN_ERR_PROT_FORM;
 989                         if (es->leaf.error_factor & M16C_EF_STFE)
 990                                 cf->data[2] |= CAN_ERR_PROT_STUFF;
 991                         if (es->leaf.error_factor & M16C_EF_BITE0)
 992                                 cf->data[2] |= CAN_ERR_PROT_BIT0;
 993                         if (es->leaf.error_factor & M16C_EF_BITE1)
 994                                 cf->data[2] |= CAN_ERR_PROT_BIT1;
 995                         if (es->leaf.error_factor & M16C_EF_TRE)
 996                                 cf->data[2] |= CAN_ERR_PROT_TX;
 997                 }
 998                 break;
 999         case KVASER_USBCAN:
1000                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
1001                         cf->can_id |= CAN_ERR_BUSERROR;
1002                 }
1003                 break;
1004         }
1005
1006         cf->data[6] = es->txerr;
1007         cf->data[7] = es->rxerr;
1008
1009         stats->rx_packets++;
1010         stats->rx_bytes += cf->can_dlc;
1011         netif_rx(skb);
1012 }
1013
1014 /* For USBCAN, report error to userspace iff the channels's errors counter
1015  * has changed, or we're the only channel seeing a bus error state.
1016  */
1017 static void kvaser_usbcan_conditionally_rx_error(const struct kvaser_usb *dev,
1018                                                  struct kvaser_usb_error_summary *es)
1019 {
1020         struct kvaser_usb_net_priv *priv;
1021         int channel;
1022         bool report_error;
1023
1024         channel = es->channel;
1025         if (channel >= dev->nchannels) {
1026                 dev_err(dev->udev->dev.parent,
1027                         "Invalid channel number (%d)\n", channel);
1028                 return;
1029         }
1030
1031         priv = dev->nets[channel];
1032         report_error = false;
1033
1034         if (es->txerr != priv->bec.txerr) {
1035                 es->usbcan.error_state |= USBCAN_ERROR_STATE_TX_ERROR;
1036                 report_error = true;
1037         }
1038         if (es->rxerr != priv->bec.rxerr) {
1039                 es->usbcan.error_state |= USBCAN_ERROR_STATE_RX_ERROR;
1040                 report_error = true;
1041         }
1042         if ((es->status & M16C_STATE_BUS_ERROR) &&
1043             !(es->usbcan.other_ch_status & M16C_STATE_BUS_ERROR)) {
1044                 es->usbcan.error_state |= USBCAN_ERROR_STATE_BUSERROR;
1045                 report_error = true;
1046         }
1047
1048         if (report_error)
1049                 kvaser_usb_rx_error(dev, es);
1050 }
1051
1052 static void kvaser_usbcan_rx_error(const struct kvaser_usb *dev,
1053                                    const struct kvaser_msg *msg)
1054 {
1055         struct kvaser_usb_error_summary es = { };
1056
1057         switch (msg->id) {
1058         /* Sometimes errors are sent as unsolicited chip state events */
1059         case CMD_CHIP_STATE_EVENT:
1060                 es.channel = msg->u.usbcan.chip_state_event.channel;
1061                 es.status =  msg->u.usbcan.chip_state_event.status;
1062                 es.txerr = msg->u.usbcan.chip_state_event.tx_errors_count;
1063                 es.rxerr = msg->u.usbcan.chip_state_event.rx_errors_count;
1064                 kvaser_usbcan_conditionally_rx_error(dev, &es);
1065                 break;
1066
1067         case CMD_CAN_ERROR_EVENT:
1068                 es.channel = 0;
1069                 es.status = msg->u.usbcan.error_event.status_ch0;
1070                 es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch0;
1071                 es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch0;
1072                 es.usbcan.other_ch_status =
1073                         msg->u.usbcan.error_event.status_ch1;
1074                 kvaser_usbcan_conditionally_rx_error(dev, &es);
1075
1076                 /* The USBCAN firmware supports up to 2 channels.
1077                  * Now that ch0 was checked, check if ch1 has any errors.
1078                  */
1079                 if (dev->nchannels == MAX_USBCAN_NET_DEVICES) {
1080                         es.channel = 1;
1081                         es.status = msg->u.usbcan.error_event.status_ch1;
1082                         es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch1;
1083                         es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch1;
1084                         es.usbcan.other_ch_status =
1085                                 msg->u.usbcan.error_event.status_ch0;
1086                         kvaser_usbcan_conditionally_rx_error(dev, &es);
1087                 }
1088                 break;
1089
1090         default:
1091                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1092                         msg->id);
1093         }
1094 }
1095
1096 static void kvaser_leaf_rx_error(const struct kvaser_usb *dev,
1097                                  const struct kvaser_msg *msg)
1098 {
1099         struct kvaser_usb_error_summary es = { };
1100
1101         switch (msg->id) {
1102         case CMD_CAN_ERROR_EVENT:
1103                 es.channel = msg->u.leaf.error_event.channel;
1104                 es.status =  msg->u.leaf.error_event.status;
1105                 es.txerr = msg->u.leaf.error_event.tx_errors_count;
1106                 es.rxerr = msg->u.leaf.error_event.rx_errors_count;
1107                 es.leaf.error_factor = msg->u.leaf.error_event.error_factor;
1108                 break;
1109         case CMD_LEAF_LOG_MESSAGE:
1110                 es.channel = msg->u.leaf.log_message.channel;
1111                 es.status = msg->u.leaf.log_message.data[0];
1112                 es.txerr = msg->u.leaf.log_message.data[2];
1113                 es.rxerr = msg->u.leaf.log_message.data[3];
1114                 es.leaf.error_factor = msg->u.leaf.log_message.data[1];
1115                 break;
1116         case CMD_CHIP_STATE_EVENT:
1117                 es.channel = msg->u.leaf.chip_state_event.channel;
1118                 es.status =  msg->u.leaf.chip_state_event.status;
1119                 es.txerr = msg->u.leaf.chip_state_event.tx_errors_count;
1120                 es.rxerr = msg->u.leaf.chip_state_event.rx_errors_count;
1121                 es.leaf.error_factor = 0;
1122                 break;
1123         default:
1124                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1125                         msg->id);
1126                 return;
1127         }
1128
1129         kvaser_usb_rx_error(dev, &es);
1130 }
1131
1132 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
1133                                   const struct kvaser_msg *msg)
1134 {
1135         struct can_frame *cf;
1136         struct sk_buff *skb;
1137         struct net_device_stats *stats = &priv->netdev->stats;
1138
1139         if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1140                                          MSG_FLAG_NERR)) {
1141                 netdev_err(priv->netdev, "Unknown error (flags: 0x%02x)\n",
1142                            msg->u.rx_can_header.flag);
1143
1144                 stats->rx_errors++;
1145                 return;
1146         }
1147
1148         if (msg->u.rx_can_header.flag & MSG_FLAG_OVERRUN) {
1149                 stats->rx_over_errors++;
1150                 stats->rx_errors++;
1151
1152                 skb = alloc_can_err_skb(priv->netdev, &cf);
1153                 if (!skb) {
1154                         stats->rx_dropped++;
1155                         return;
1156                 }
1157
1158                 cf->can_id |= CAN_ERR_CRTL;
1159                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
1160
1161                 stats->rx_packets++;
1162                 stats->rx_bytes += cf->can_dlc;
1163                 netif_rx(skb);
1164         }
1165 }
1166
1167 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
1168                                   const struct kvaser_msg *msg)
1169 {
1170         struct kvaser_usb_net_priv *priv;
1171         struct can_frame *cf;
1172         struct sk_buff *skb;
1173         struct net_device_stats *stats;
1174         u8 channel = msg->u.rx_can_header.channel;
1175         const u8 *rx_msg = NULL;        /* GCC */
1176
1177         if (channel >= dev->nchannels) {
1178                 dev_err(dev->udev->dev.parent,
1179                         "Invalid channel number (%d)\n", channel);
1180                 return;
1181         }
1182
1183         priv = dev->nets[channel];
1184         stats = &priv->netdev->stats;
1185
1186         if ((msg->u.rx_can_header.flag & MSG_FLAG_ERROR_FRAME) &&
1187             (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE)) {
1188                 kvaser_leaf_rx_error(dev, msg);
1189                 return;
1190         } else if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1191                                                 MSG_FLAG_NERR |
1192                                                 MSG_FLAG_OVERRUN)) {
1193                 kvaser_usb_rx_can_err(priv, msg);
1194                 return;
1195         } else if (msg->u.rx_can_header.flag & ~MSG_FLAG_REMOTE_FRAME) {
1196                 netdev_warn(priv->netdev,
1197                             "Unhandled frame (flags: 0x%02x)",
1198                             msg->u.rx_can_header.flag);
1199                 return;
1200         }
1201
1202         switch (dev->family) {
1203         case KVASER_LEAF:
1204                 rx_msg = msg->u.leaf.rx_can.msg;
1205                 break;
1206         case KVASER_USBCAN:
1207                 rx_msg = msg->u.usbcan.rx_can.msg;
1208                 break;
1209         }
1210
1211         skb = alloc_can_skb(priv->netdev, &cf);
1212         if (!skb) {
1213                 stats->rx_dropped++;
1214                 return;
1215         }
1216
1217         if (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE) {
1218                 cf->can_id = le32_to_cpu(msg->u.leaf.log_message.id);
1219                 if (cf->can_id & KVASER_EXTENDED_FRAME)
1220                         cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
1221                 else
1222                         cf->can_id &= CAN_SFF_MASK;
1223
1224                 cf->can_dlc = get_can_dlc(msg->u.leaf.log_message.dlc);
1225
1226                 if (msg->u.leaf.log_message.flags & MSG_FLAG_REMOTE_FRAME)
1227                         cf->can_id |= CAN_RTR_FLAG;
1228                 else
1229                         memcpy(cf->data, &msg->u.leaf.log_message.data,
1230                                cf->can_dlc);
1231         } else {
1232                 cf->can_id = ((rx_msg[0] & 0x1f) << 6) | (rx_msg[1] & 0x3f);
1233
1234                 if (msg->id == CMD_RX_EXT_MESSAGE) {
1235                         cf->can_id <<= 18;
1236                         cf->can_id |= ((rx_msg[2] & 0x0f) << 14) |
1237                                       ((rx_msg[3] & 0xff) << 6) |
1238                                       (rx_msg[4] & 0x3f);
1239                         cf->can_id |= CAN_EFF_FLAG;
1240                 }
1241
1242                 cf->can_dlc = get_can_dlc(rx_msg[5]);
1243
1244                 if (msg->u.rx_can_header.flag & MSG_FLAG_REMOTE_FRAME)
1245                         cf->can_id |= CAN_RTR_FLAG;
1246                 else
1247                         memcpy(cf->data, &rx_msg[6],
1248                                cf->can_dlc);
1249         }
1250
1251         stats->rx_packets++;
1252         stats->rx_bytes += cf->can_dlc;
1253         netif_rx(skb);
1254 }
1255
1256 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
1257                                         const struct kvaser_msg *msg)
1258 {
1259         struct kvaser_usb_net_priv *priv;
1260         u8 channel = msg->u.simple.channel;
1261
1262         if (channel >= dev->nchannels) {
1263                 dev_err(dev->udev->dev.parent,
1264                         "Invalid channel number (%d)\n", channel);
1265                 return;
1266         }
1267
1268         priv = dev->nets[channel];
1269
1270         if (completion_done(&priv->start_comp) &&
1271             netif_queue_stopped(priv->netdev)) {
1272                 netif_wake_queue(priv->netdev);
1273         } else {
1274                 netif_start_queue(priv->netdev);
1275                 complete(&priv->start_comp);
1276         }
1277 }
1278
1279 static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
1280                                        const struct kvaser_msg *msg)
1281 {
1282         struct kvaser_usb_net_priv *priv;
1283         u8 channel = msg->u.simple.channel;
1284
1285         if (channel >= dev->nchannels) {
1286                 dev_err(dev->udev->dev.parent,
1287                         "Invalid channel number (%d)\n", channel);
1288                 return;
1289         }
1290
1291         priv = dev->nets[channel];
1292
1293         complete(&priv->stop_comp);
1294 }
1295
1296 static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
1297                                       const struct kvaser_msg *msg)
1298 {
1299         switch (msg->id) {
1300         case CMD_START_CHIP_REPLY:
1301                 kvaser_usb_start_chip_reply(dev, msg);
1302                 break;
1303
1304         case CMD_STOP_CHIP_REPLY:
1305                 kvaser_usb_stop_chip_reply(dev, msg);
1306                 break;
1307
1308         case CMD_RX_STD_MESSAGE:
1309         case CMD_RX_EXT_MESSAGE:
1310                 kvaser_usb_rx_can_msg(dev, msg);
1311                 break;
1312
1313         case CMD_LEAF_LOG_MESSAGE:
1314                 if (dev->family != KVASER_LEAF)
1315                         goto warn;
1316                 kvaser_usb_rx_can_msg(dev, msg);
1317                 break;
1318
1319         case CMD_CHIP_STATE_EVENT:
1320         case CMD_CAN_ERROR_EVENT:
1321                 if (dev->family == KVASER_LEAF)
1322                         kvaser_leaf_rx_error(dev, msg);
1323                 else
1324                         kvaser_usbcan_rx_error(dev, msg);
1325                 break;
1326
1327         case CMD_TX_ACKNOWLEDGE:
1328                 kvaser_usb_tx_acknowledge(dev, msg);
1329                 break;
1330
1331         /* Ignored messages */
1332         case CMD_USBCAN_CLOCK_OVERFLOW_EVENT:
1333                 if (dev->family != KVASER_USBCAN)
1334                         goto warn;
1335                 break;
1336
1337         case CMD_FLUSH_QUEUE_REPLY:
1338                 if (dev->family != KVASER_LEAF)
1339                         goto warn;
1340                 break;
1341
1342         default:
1343 warn:           dev_warn(dev->udev->dev.parent,
1344                          "Unhandled message (%d)\n", msg->id);
1345                 break;
1346         }
1347 }
1348
1349 static void kvaser_usb_read_bulk_callback(struct urb *urb)
1350 {
1351         struct kvaser_usb *dev = urb->context;
1352         struct kvaser_msg *msg;
1353         int pos = 0;
1354         int err, i;
1355
1356         switch (urb->status) {
1357         case 0:
1358                 break;
1359         case -ENOENT:
1360         case -EPIPE:
1361         case -EPROTO:
1362         case -ESHUTDOWN:
1363                 return;
1364         default:
1365                 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
1366                          urb->status);
1367                 goto resubmit_urb;
1368         }
1369
1370         while (pos <= (int)(urb->actual_length - MSG_HEADER_LEN)) {
1371                 msg = urb->transfer_buffer + pos;
1372
1373                 /* The Kvaser firmware can only read and write messages that
1374                  * does not cross the USB's endpoint wMaxPacketSize boundary.
1375                  * If a follow-up command crosses such boundary, firmware puts
1376                  * a placeholder zero-length command in its place then aligns
1377                  * the real command to the next max packet size.
1378                  *
1379                  * Handle such cases or we're going to miss a significant
1380                  * number of events in case of a heavy rx load on the bus.
1381                  */
1382                 if (msg->len == 0) {
1383                         pos = round_up(pos, le16_to_cpu(dev->bulk_in->
1384                                                         wMaxPacketSize));
1385                         continue;
1386                 }
1387
1388                 if (pos + msg->len > urb->actual_length) {
1389                         dev_err_ratelimited(dev->udev->dev.parent,
1390                                             "Format error\n");
1391                         break;
1392                 }
1393
1394                 kvaser_usb_handle_message(dev, msg);
1395                 pos += msg->len;
1396         }
1397
1398 resubmit_urb:
1399         usb_fill_bulk_urb(urb, dev->udev,
1400                           usb_rcvbulkpipe(dev->udev,
1401                                           dev->bulk_in->bEndpointAddress),
1402                           urb->transfer_buffer, RX_BUFFER_SIZE,
1403                           kvaser_usb_read_bulk_callback, dev);
1404
1405         err = usb_submit_urb(urb, GFP_ATOMIC);
1406         if (err == -ENODEV) {
1407                 for (i = 0; i < dev->nchannels; i++) {
1408                         if (!dev->nets[i])
1409                                 continue;
1410
1411                         netif_device_detach(dev->nets[i]->netdev);
1412                 }
1413         } else if (err) {
1414                 dev_err(dev->udev->dev.parent,
1415                         "Failed resubmitting read bulk urb: %d\n", err);
1416         }
1417
1418         return;
1419 }
1420
1421 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1422 {
1423         int i, err = 0;
1424
1425         if (dev->rxinitdone)
1426                 return 0;
1427
1428         for (i = 0; i < MAX_RX_URBS; i++) {
1429                 struct urb *urb = NULL;
1430                 u8 *buf = NULL;
1431                 dma_addr_t buf_dma;
1432
1433                 urb = usb_alloc_urb(0, GFP_KERNEL);
1434                 if (!urb) {
1435                         err = -ENOMEM;
1436                         break;
1437                 }
1438
1439                 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1440                                          GFP_KERNEL, &buf_dma);
1441                 if (!buf) {
1442                         dev_warn(dev->udev->dev.parent,
1443                                  "No memory left for USB buffer\n");
1444                         usb_free_urb(urb);
1445                         err = -ENOMEM;
1446                         break;
1447                 }
1448
1449                 usb_fill_bulk_urb(urb, dev->udev,
1450                                   usb_rcvbulkpipe(dev->udev,
1451                                           dev->bulk_in->bEndpointAddress),
1452                                   buf, RX_BUFFER_SIZE,
1453                                   kvaser_usb_read_bulk_callback,
1454                                   dev);
1455                 urb->transfer_dma = buf_dma;
1456                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1457                 usb_anchor_urb(urb, &dev->rx_submitted);
1458
1459                 err = usb_submit_urb(urb, GFP_KERNEL);
1460                 if (err) {
1461                         usb_unanchor_urb(urb);
1462                         usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1463                                           buf_dma);
1464                         usb_free_urb(urb);
1465                         break;
1466                 }
1467
1468                 dev->rxbuf[i] = buf;
1469                 dev->rxbuf_dma[i] = buf_dma;
1470
1471                 usb_free_urb(urb);
1472         }
1473
1474         if (i == 0) {
1475                 dev_warn(dev->udev->dev.parent,
1476                          "Cannot setup read URBs, error %d\n", err);
1477                 return err;
1478         } else if (i < MAX_RX_URBS) {
1479                 dev_warn(dev->udev->dev.parent,
1480                          "RX performances may be slow\n");
1481         }
1482
1483         dev->rxinitdone = true;
1484
1485         return 0;
1486 }
1487
1488 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1489 {
1490         struct kvaser_msg *msg;
1491         int rc;
1492
1493         msg = kzalloc(sizeof(*msg), GFP_KERNEL);
1494         if (!msg)
1495                 return -ENOMEM;
1496
1497         msg->id = CMD_SET_CTRL_MODE;
1498         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1499         msg->u.ctrl_mode.tid = 0xff;
1500         msg->u.ctrl_mode.channel = priv->channel;
1501
1502         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1503                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1504         else
1505                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1506
1507         rc = kvaser_usb_send_msg(priv->dev, msg);
1508
1509         kfree(msg);
1510         return rc;
1511 }
1512
1513 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1514 {
1515         int err;
1516
1517         init_completion(&priv->start_comp);
1518
1519         err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1520                                          priv->channel);
1521         if (err)
1522                 return err;
1523
1524         if (!wait_for_completion_timeout(&priv->start_comp,
1525                                          msecs_to_jiffies(START_TIMEOUT)))
1526                 return -ETIMEDOUT;
1527
1528         return 0;
1529 }
1530
1531 static int kvaser_usb_open(struct net_device *netdev)
1532 {
1533         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1534         struct kvaser_usb *dev = priv->dev;
1535         int err;
1536
1537         err = open_candev(netdev);
1538         if (err)
1539                 return err;
1540
1541         err = kvaser_usb_setup_rx_urbs(dev);
1542         if (err)
1543                 goto error;
1544
1545         err = kvaser_usb_set_opt_mode(priv);
1546         if (err)
1547                 goto error;
1548
1549         err = kvaser_usb_start_chip(priv);
1550         if (err) {
1551                 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1552                 goto error;
1553         }
1554
1555         priv->can.state = CAN_STATE_ERROR_ACTIVE;
1556
1557         return 0;
1558
1559 error:
1560         close_candev(netdev);
1561         return err;
1562 }
1563
1564 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
1565 {
1566         int i, max_tx_urbs;
1567
1568         max_tx_urbs = priv->dev->max_tx_urbs;
1569
1570         priv->active_tx_contexts = 0;
1571         for (i = 0; i < max_tx_urbs; i++)
1572                 priv->tx_contexts[i].echo_index = max_tx_urbs;
1573 }
1574
1575 /* This method might sleep. Do not call it in the atomic context
1576  * of URB completions.
1577  */
1578 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
1579 {
1580         usb_kill_anchored_urbs(&priv->tx_submitted);
1581         kvaser_usb_reset_tx_urb_contexts(priv);
1582 }
1583
1584 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1585 {
1586         int i;
1587
1588         usb_kill_anchored_urbs(&dev->rx_submitted);
1589
1590         for (i = 0; i < MAX_RX_URBS; i++)
1591                 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1592                                   dev->rxbuf[i],
1593                                   dev->rxbuf_dma[i]);
1594
1595         for (i = 0; i < dev->nchannels; i++) {
1596                 struct kvaser_usb_net_priv *priv = dev->nets[i];
1597
1598                 if (priv)
1599                         kvaser_usb_unlink_tx_urbs(priv);
1600         }
1601 }
1602
1603 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1604 {
1605         int err;
1606
1607         init_completion(&priv->stop_comp);
1608
1609         err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1610                                          priv->channel);
1611         if (err)
1612                 return err;
1613
1614         if (!wait_for_completion_timeout(&priv->stop_comp,
1615                                          msecs_to_jiffies(STOP_TIMEOUT)))
1616                 return -ETIMEDOUT;
1617
1618         return 0;
1619 }
1620
1621 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1622 {
1623         struct kvaser_msg *msg;
1624         int rc;
1625
1626         msg = kzalloc(sizeof(*msg), GFP_KERNEL);
1627         if (!msg)
1628                 return -ENOMEM;
1629
1630         msg->id = CMD_FLUSH_QUEUE;
1631         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1632         msg->u.flush_queue.channel = priv->channel;
1633         msg->u.flush_queue.flags = 0x00;
1634
1635         rc = kvaser_usb_send_msg(priv->dev, msg);
1636
1637         kfree(msg);
1638         return rc;
1639 }
1640
1641 static int kvaser_usb_close(struct net_device *netdev)
1642 {
1643         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1644         struct kvaser_usb *dev = priv->dev;
1645         int err;
1646
1647         netif_stop_queue(netdev);
1648
1649         err = kvaser_usb_flush_queue(priv);
1650         if (err)
1651                 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1652
1653         err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel);
1654         if (err)
1655                 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1656
1657         err = kvaser_usb_stop_chip(priv);
1658         if (err)
1659                 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1660
1661         /* reset tx contexts */
1662         kvaser_usb_unlink_tx_urbs(priv);
1663
1664         priv->can.state = CAN_STATE_STOPPED;
1665         close_candev(priv->netdev);
1666
1667         return 0;
1668 }
1669
1670 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1671 {
1672         struct kvaser_usb_tx_urb_context *context = urb->context;
1673         struct kvaser_usb_net_priv *priv;
1674         struct net_device *netdev;
1675
1676         if (WARN_ON(!context))
1677                 return;
1678
1679         priv = context->priv;
1680         netdev = priv->netdev;
1681
1682         kfree(urb->transfer_buffer);
1683
1684         if (!netif_device_present(netdev))
1685                 return;
1686
1687         if (urb->status)
1688                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1689 }
1690
1691 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1692                                          struct net_device *netdev)
1693 {
1694         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1695         struct kvaser_usb *dev = priv->dev;
1696         struct net_device_stats *stats = &netdev->stats;
1697         struct can_frame *cf = (struct can_frame *)skb->data;
1698         struct kvaser_usb_tx_urb_context *context = NULL;
1699         struct urb *urb;
1700         void *buf;
1701         struct kvaser_msg *msg;
1702         int i, err, ret = NETDEV_TX_OK;
1703         u8 *msg_tx_can_flags = NULL;            /* GCC */
1704         unsigned long flags;
1705
1706         if (can_dropped_invalid_skb(netdev, skb))
1707                 return NETDEV_TX_OK;
1708
1709         urb = usb_alloc_urb(0, GFP_ATOMIC);
1710         if (!urb) {
1711                 stats->tx_dropped++;
1712                 dev_kfree_skb(skb);
1713                 return NETDEV_TX_OK;
1714         }
1715
1716         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1717         if (!buf) {
1718                 stats->tx_dropped++;
1719                 dev_kfree_skb(skb);
1720                 goto freeurb;
1721         }
1722
1723         msg = buf;
1724         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1725         msg->u.tx_can.channel = priv->channel;
1726
1727         switch (dev->family) {
1728         case KVASER_LEAF:
1729                 msg_tx_can_flags = &msg->u.tx_can.leaf.flags;
1730                 break;
1731         case KVASER_USBCAN:
1732                 msg_tx_can_flags = &msg->u.tx_can.usbcan.flags;
1733                 break;
1734         }
1735
1736         *msg_tx_can_flags = 0;
1737
1738         if (cf->can_id & CAN_EFF_FLAG) {
1739                 msg->id = CMD_TX_EXT_MESSAGE;
1740                 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1741                 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1742                 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1743                 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1744                 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1745         } else {
1746                 msg->id = CMD_TX_STD_MESSAGE;
1747                 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1748                 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1749         }
1750
1751         msg->u.tx_can.msg[5] = cf->can_dlc;
1752         memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1753
1754         if (cf->can_id & CAN_RTR_FLAG)
1755                 *msg_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
1756
1757         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1758         for (i = 0; i < dev->max_tx_urbs; i++) {
1759                 if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
1760                         context = &priv->tx_contexts[i];
1761
1762                         context->echo_index = i;
1763                         can_put_echo_skb(skb, netdev, context->echo_index);
1764                         ++priv->active_tx_contexts;
1765                         if (priv->active_tx_contexts >= dev->max_tx_urbs)
1766                                 netif_stop_queue(netdev);
1767
1768                         break;
1769                 }
1770         }
1771         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1772
1773         /* This should never happen; it implies a flow control bug */
1774         if (!context) {
1775                 netdev_warn(netdev, "cannot find free context\n");
1776
1777                 kfree(buf);
1778                 ret =  NETDEV_TX_BUSY;
1779                 goto freeurb;
1780         }
1781
1782         context->priv = priv;
1783         context->dlc = cf->can_dlc;
1784
1785         msg->u.tx_can.tid = context->echo_index;
1786
1787         usb_fill_bulk_urb(urb, dev->udev,
1788                           usb_sndbulkpipe(dev->udev,
1789                                           dev->bulk_out->bEndpointAddress),
1790                           buf, msg->len,
1791                           kvaser_usb_write_bulk_callback, context);
1792         usb_anchor_urb(urb, &priv->tx_submitted);
1793
1794         err = usb_submit_urb(urb, GFP_ATOMIC);
1795         if (unlikely(err)) {
1796                 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1797
1798                 can_free_echo_skb(netdev, context->echo_index);
1799                 context->echo_index = dev->max_tx_urbs;
1800                 --priv->active_tx_contexts;
1801                 netif_wake_queue(netdev);
1802
1803                 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1804
1805                 usb_unanchor_urb(urb);
1806                 kfree(buf);
1807
1808                 stats->tx_dropped++;
1809
1810                 if (err == -ENODEV)
1811                         netif_device_detach(netdev);
1812                 else
1813                         netdev_warn(netdev, "Failed tx_urb %d\n", err);
1814
1815                 goto freeurb;
1816         }
1817
1818         ret = NETDEV_TX_OK;
1819
1820 freeurb:
1821         usb_free_urb(urb);
1822         return ret;
1823 }
1824
1825 static const struct net_device_ops kvaser_usb_netdev_ops = {
1826         .ndo_open = kvaser_usb_open,
1827         .ndo_stop = kvaser_usb_close,
1828         .ndo_start_xmit = kvaser_usb_start_xmit,
1829         .ndo_change_mtu = can_change_mtu,
1830 };
1831
1832 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1833         .name = "kvaser_usb",
1834         .tseg1_min = KVASER_USB_TSEG1_MIN,
1835         .tseg1_max = KVASER_USB_TSEG1_MAX,
1836         .tseg2_min = KVASER_USB_TSEG2_MIN,
1837         .tseg2_max = KVASER_USB_TSEG2_MAX,
1838         .sjw_max = KVASER_USB_SJW_MAX,
1839         .brp_min = KVASER_USB_BRP_MIN,
1840         .brp_max = KVASER_USB_BRP_MAX,
1841         .brp_inc = KVASER_USB_BRP_INC,
1842 };
1843
1844 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1845 {
1846         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1847         struct can_bittiming *bt = &priv->can.bittiming;
1848         struct kvaser_usb *dev = priv->dev;
1849         struct kvaser_msg *msg;
1850         int rc;
1851
1852         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1853         if (!msg)
1854                 return -ENOMEM;
1855
1856         msg->id = CMD_SET_BUS_PARAMS;
1857         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1858         msg->u.busparams.channel = priv->channel;
1859         msg->u.busparams.tid = 0xff;
1860         msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1861         msg->u.busparams.sjw = bt->sjw;
1862         msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1863         msg->u.busparams.tseg2 = bt->phase_seg2;
1864
1865         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1866                 msg->u.busparams.no_samp = 3;
1867         else
1868                 msg->u.busparams.no_samp = 1;
1869
1870         rc = kvaser_usb_send_msg(dev, msg);
1871
1872         kfree(msg);
1873         return rc;
1874 }
1875
1876 static int kvaser_usb_set_mode(struct net_device *netdev,
1877                                enum can_mode mode)
1878 {
1879         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1880         int err;
1881
1882         switch (mode) {
1883         case CAN_MODE_START:
1884                 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1885                 if (err)
1886                         return err;
1887                 break;
1888         default:
1889                 return -EOPNOTSUPP;
1890         }
1891
1892         return 0;
1893 }
1894
1895 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1896                                        struct can_berr_counter *bec)
1897 {
1898         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1899
1900         *bec = priv->bec;
1901
1902         return 0;
1903 }
1904
1905 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1906 {
1907         int i;
1908
1909         for (i = 0; i < dev->nchannels; i++) {
1910                 if (!dev->nets[i])
1911                         continue;
1912
1913                 unregister_candev(dev->nets[i]->netdev);
1914         }
1915
1916         kvaser_usb_unlink_all_urbs(dev);
1917
1918         for (i = 0; i < dev->nchannels; i++) {
1919                 if (!dev->nets[i])
1920                         continue;
1921
1922                 free_candev(dev->nets[i]->netdev);
1923         }
1924 }
1925
1926 static int kvaser_usb_init_one(struct usb_interface *intf,
1927                                const struct usb_device_id *id, int channel)
1928 {
1929         struct kvaser_usb *dev = usb_get_intfdata(intf);
1930         struct net_device *netdev;
1931         struct kvaser_usb_net_priv *priv;
1932         int err;
1933
1934         err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
1935         if (err)
1936                 return err;
1937
1938         netdev = alloc_candev(sizeof(*priv) +
1939                               dev->max_tx_urbs * sizeof(*priv->tx_contexts),
1940                               dev->max_tx_urbs);
1941         if (!netdev) {
1942                 dev_err(&intf->dev, "Cannot alloc candev\n");
1943                 return -ENOMEM;
1944         }
1945
1946         priv = netdev_priv(netdev);
1947
1948         init_usb_anchor(&priv->tx_submitted);
1949         init_completion(&priv->start_comp);
1950         init_completion(&priv->stop_comp);
1951
1952         priv->dev = dev;
1953         priv->netdev = netdev;
1954         priv->channel = channel;
1955
1956         spin_lock_init(&priv->tx_contexts_lock);
1957         kvaser_usb_reset_tx_urb_contexts(priv);
1958
1959         priv->can.state = CAN_STATE_STOPPED;
1960         priv->can.clock.freq = dev->clock.freq;
1961         priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1962         priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1963         priv->can.do_set_mode = kvaser_usb_set_mode;
1964         if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1965                 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1966         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1967         if (id->driver_info & KVASER_HAS_SILENT_MODE)
1968                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1969
1970         netdev->flags |= IFF_ECHO;
1971
1972         netdev->netdev_ops = &kvaser_usb_netdev_ops;
1973
1974         SET_NETDEV_DEV(netdev, &intf->dev);
1975         netdev->dev_id = channel;
1976
1977         dev->nets[channel] = priv;
1978
1979         err = register_candev(netdev);
1980         if (err) {
1981                 dev_err(&intf->dev, "Failed to register can device\n");
1982                 free_candev(netdev);
1983                 dev->nets[channel] = NULL;
1984                 return err;
1985         }
1986
1987         netdev_dbg(netdev, "device registered\n");
1988
1989         return 0;
1990 }
1991
1992 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1993                                     struct usb_endpoint_descriptor **in,
1994                                     struct usb_endpoint_descriptor **out)
1995 {
1996         const struct usb_host_interface *iface_desc;
1997         struct usb_endpoint_descriptor *endpoint;
1998         int i;
1999
2000         iface_desc = &intf->altsetting[0];
2001
2002         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
2003                 endpoint = &iface_desc->endpoint[i].desc;
2004
2005                 if (!*in && usb_endpoint_is_bulk_in(endpoint))
2006                         *in = endpoint;
2007
2008                 if (!*out && usb_endpoint_is_bulk_out(endpoint))
2009                         *out = endpoint;
2010
2011                 /* use first bulk endpoint for in and out */
2012                 if (*in && *out)
2013                         return 0;
2014         }
2015
2016         return -ENODEV;
2017 }
2018
2019 static int kvaser_usb_probe(struct usb_interface *intf,
2020                             const struct usb_device_id *id)
2021 {
2022         struct kvaser_usb *dev;
2023         int err = -ENOMEM;
2024         int i, retry = 3;
2025
2026         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
2027         if (!dev)
2028                 return -ENOMEM;
2029
2030         if (kvaser_is_leaf(id)) {
2031                 dev->family = KVASER_LEAF;
2032         } else if (kvaser_is_usbcan(id)) {
2033                 dev->family = KVASER_USBCAN;
2034         } else {
2035                 dev_err(&intf->dev,
2036                         "Product ID (%d) does not belong to any known Kvaser USB family",
2037                         id->idProduct);
2038                 return -ENODEV;
2039         }
2040
2041         err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
2042         if (err) {
2043                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
2044                 return err;
2045         }
2046
2047         dev->udev = interface_to_usbdev(intf);
2048
2049         init_usb_anchor(&dev->rx_submitted);
2050
2051         usb_set_intfdata(intf, dev);
2052
2053         /* On some x86 laptops, plugging a Kvaser device again after
2054          * an unplug makes the firmware always ignore the very first
2055          * command. For such a case, provide some room for retries
2056          * instead of completely exiting the driver.
2057          */
2058         do {
2059                 err = kvaser_usb_get_software_info(dev);
2060         } while (--retry && err == -ETIMEDOUT);
2061
2062         if (err) {
2063                 dev_err(&intf->dev,
2064                         "Cannot get software infos, error %d\n", err);
2065                 return err;
2066         }
2067
2068         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
2069                 ((dev->fw_version >> 24) & 0xff),
2070                 ((dev->fw_version >> 16) & 0xff),
2071                 (dev->fw_version & 0xffff));
2072
2073         dev_dbg(&intf->dev, "Max outstanding tx = %d URBs\n", dev->max_tx_urbs);
2074
2075         err = kvaser_usb_get_card_info(dev);
2076         if (err) {
2077                 dev_err(&intf->dev,
2078                         "Cannot get card infos, error %d\n", err);
2079                 return err;
2080         }
2081
2082         for (i = 0; i < dev->nchannels; i++) {
2083                 err = kvaser_usb_init_one(intf, id, i);
2084                 if (err) {
2085                         kvaser_usb_remove_interfaces(dev);
2086                         return err;
2087                 }
2088         }
2089
2090         return 0;
2091 }
2092
2093 static void kvaser_usb_disconnect(struct usb_interface *intf)
2094 {
2095         struct kvaser_usb *dev = usb_get_intfdata(intf);
2096
2097         usb_set_intfdata(intf, NULL);
2098
2099         if (!dev)
2100                 return;
2101
2102         kvaser_usb_remove_interfaces(dev);
2103 }
2104
2105 static struct usb_driver kvaser_usb_driver = {
2106         .name = "kvaser_usb",
2107         .probe = kvaser_usb_probe,
2108         .disconnect = kvaser_usb_disconnect,
2109         .id_table = kvaser_usb_table,
2110 };
2111
2112 module_usb_driver(kvaser_usb_driver);
2113
2114 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
2115 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
2116 MODULE_LICENSE("GPL v2");