drivers/net/can/usb/kvaser_usb.c

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public License as
   4  * published by the Free Software Foundation version 2.
   5  *
   6  * Parts of this driver are based on the following:
   7  *  - Kvaser linux leaf driver (version 4.78)
   8  *  - CAN driver for esd CAN-USB/2
   9  *  - Kvaser linux usbcanII driver (version 5.3)
  10  *
  11  * Copyright (C) 2002-2006 KVASER AB, Sweden. All rights reserved.
  12  * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
  13  * Copyright (C) 2012 Olivier Sobrie <olivier@sobrie.be>
  14  * Copyright (C) 2015 Valeo S.A.
  15  */
  16
  17 #include <linux/spinlock.h>
  18 #include <linux/kernel.h>
  19 #include <linux/completion.h>
  20 #include <linux/module.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/usb.h>
  23
  24 #include <linux/can.h>
  25 #include <linux/can/dev.h>
  26 #include <linux/can/error.h>
  27
  28 #define MAX_RX_URBS                     4
  29 #define START_TIMEOUT                   1000 /* msecs */
  30 #define STOP_TIMEOUT                    1000 /* msecs */
  31 #define USB_SEND_TIMEOUT                1000 /* msecs */
  32 #define USB_RECV_TIMEOUT                1000 /* msecs */
  33 #define RX_BUFFER_SIZE                  3072
  34 #define CAN_USB_CLOCK                   8000000
  35 #define MAX_NET_DEVICES                 3
  36 #define MAX_USBCAN_NET_DEVICES          2
  37
  38 /* Kvaser Leaf USB devices */
  39 #define KVASER_VENDOR_ID                0x0bfd
  40 #define USB_LEAF_DEVEL_PRODUCT_ID       10
  41 #define USB_LEAF_LITE_PRODUCT_ID        11
  42 #define USB_LEAF_PRO_PRODUCT_ID         12
  43 #define USB_LEAF_SPRO_PRODUCT_ID        14
  44 #define USB_LEAF_PRO_LS_PRODUCT_ID      15
  45 #define USB_LEAF_PRO_SWC_PRODUCT_ID     16
  46 #define USB_LEAF_PRO_LIN_PRODUCT_ID     17
  47 #define USB_LEAF_SPRO_LS_PRODUCT_ID     18
  48 #define USB_LEAF_SPRO_SWC_PRODUCT_ID    19
  49 #define USB_MEMO2_DEVEL_PRODUCT_ID      22
  50 #define USB_MEMO2_HSHS_PRODUCT_ID       23
  51 #define USB_UPRO_HSHS_PRODUCT_ID        24
  52 #define USB_LEAF_LITE_GI_PRODUCT_ID     25
  53 #define USB_LEAF_PRO_OBDII_PRODUCT_ID   26
  54 #define USB_MEMO2_HSLS_PRODUCT_ID       27
  55 #define USB_LEAF_LITE_CH_PRODUCT_ID     28
  56 #define USB_BLACKBIRD_SPRO_PRODUCT_ID   29
  57 #define USB_OEM_MERCURY_PRODUCT_ID      34
  58 #define USB_OEM_LEAF_PRODUCT_ID         35
  59 #define USB_CAN_R_PRODUCT_ID            39
  60 #define USB_LEAF_LITE_V2_PRODUCT_ID     288
  61 #define USB_MINI_PCIE_HS_PRODUCT_ID     289
  62 #define USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID 290
  63 #define USB_USBCAN_LIGHT_2HS_PRODUCT_ID 291
  64 #define USB_MINI_PCIE_2HS_PRODUCT_ID    292
  65
  66 static inline bool kvaser_is_leaf(const struct usb_device_id *id)
  67 {
  68         return id->idProduct >= USB_LEAF_DEVEL_PRODUCT_ID &&
  69                id->idProduct <= USB_MINI_PCIE_2HS_PRODUCT_ID;
  70 }
  71
  72 /* Kvaser USBCan-II devices */
  73 #define USB_USBCAN_REVB_PRODUCT_ID      2
  74 #define USB_VCI2_PRODUCT_ID             3
  75 #define USB_USBCAN2_PRODUCT_ID          4
  76 #define USB_MEMORATOR_PRODUCT_ID        5
  77
  78 static inline bool kvaser_is_usbcan(const struct usb_device_id *id)
  79 {
  80         return id->idProduct >= USB_USBCAN_REVB_PRODUCT_ID &&
  81                id->idProduct <= USB_MEMORATOR_PRODUCT_ID;
  82 }
  83
  84 /* USB devices features */
  85 #define KVASER_HAS_SILENT_MODE          BIT(0)
  86 #define KVASER_HAS_TXRX_ERRORS          BIT(1)
  87
  88 /* Message header size */
  89 #define MSG_HEADER_LEN                  2
  90
  91 /* Can message flags */
  92 #define MSG_FLAG_ERROR_FRAME            BIT(0)
  93 #define MSG_FLAG_OVERRUN                BIT(1)
  94 #define MSG_FLAG_NERR                   BIT(2)
  95 #define MSG_FLAG_WAKEUP                 BIT(3)
  96 #define MSG_FLAG_REMOTE_FRAME           BIT(4)
  97 #define MSG_FLAG_RESERVED               BIT(5)
  98 #define MSG_FLAG_TX_ACK                 BIT(6)
  99 #define MSG_FLAG_TX_REQUEST             BIT(7)
 100
 101 /* Can states (M16C CxSTRH register) */
 102 #define M16C_STATE_BUS_RESET            BIT(0)
 103 #define M16C_STATE_BUS_ERROR            BIT(4)
 104 #define M16C_STATE_BUS_PASSIVE          BIT(5)
 105 #define M16C_STATE_BUS_OFF              BIT(6)
 106
 107 /* Can msg ids */
 108 #define CMD_RX_STD_MESSAGE              12
 109 #define CMD_TX_STD_MESSAGE              13
 110 #define CMD_RX_EXT_MESSAGE              14
 111 #define CMD_TX_EXT_MESSAGE              15
 112 #define CMD_SET_BUS_PARAMS              16
 113 #define CMD_GET_BUS_PARAMS              17
 114 #define CMD_GET_BUS_PARAMS_REPLY        18
 115 #define CMD_GET_CHIP_STATE              19
 116 #define CMD_CHIP_STATE_EVENT            20
 117 #define CMD_SET_CTRL_MODE               21
 118 #define CMD_GET_CTRL_MODE               22
 119 #define CMD_GET_CTRL_MODE_REPLY         23
 120 #define CMD_RESET_CHIP                  24
 121 #define CMD_RESET_CARD                  25
 122 #define CMD_START_CHIP                  26
 123 #define CMD_START_CHIP_REPLY            27
 124 #define CMD_STOP_CHIP                   28
 125 #define CMD_STOP_CHIP_REPLY             29
 126
 127 #define CMD_LEAF_GET_CARD_INFO2         32
 128 #define CMD_USBCAN_RESET_CLOCK          32
 129 #define CMD_USBCAN_CLOCK_OVERFLOW_EVENT 33
 130
 131 #define CMD_GET_CARD_INFO               34
 132 #define CMD_GET_CARD_INFO_REPLY         35
 133 #define CMD_GET_SOFTWARE_INFO           38
 134 #define CMD_GET_SOFTWARE_INFO_REPLY     39
 135 #define CMD_ERROR_EVENT                 45
 136 #define CMD_FLUSH_QUEUE                 48
 137 #define CMD_RESET_ERROR_COUNTER         49
 138 #define CMD_TX_ACKNOWLEDGE              50
 139 #define CMD_CAN_ERROR_EVENT             51
 140
 141 #define CMD_LEAF_USB_THROTTLE           77
 142 #define CMD_LEAF_LOG_MESSAGE            106
 143
 144 /* error factors */
 145 #define M16C_EF_ACKE                    BIT(0)
 146 #define M16C_EF_CRCE                    BIT(1)
 147 #define M16C_EF_FORME                   BIT(2)
 148 #define M16C_EF_STFE                    BIT(3)
 149 #define M16C_EF_BITE0                   BIT(4)
 150 #define M16C_EF_BITE1                   BIT(5)
 151 #define M16C_EF_RCVE                    BIT(6)
 152 #define M16C_EF_TRE                     BIT(7)
 153
 154 /* Only Leaf-based devices can report M16C error factors,
 155  * thus define our own error status flags for USBCANII
 156  */
 157 #define USBCAN_ERROR_STATE_NONE         0
 158 #define USBCAN_ERROR_STATE_TX_ERROR     BIT(0)
 159 #define USBCAN_ERROR_STATE_RX_ERROR     BIT(1)
 160 #define USBCAN_ERROR_STATE_BUSERROR     BIT(2)
 161
 162 /* bittiming parameters */
 163 #define KVASER_USB_TSEG1_MIN            1
 164 #define KVASER_USB_TSEG1_MAX            16
 165 #define KVASER_USB_TSEG2_MIN            1
 166 #define KVASER_USB_TSEG2_MAX            8
 167 #define KVASER_USB_SJW_MAX              4
 168 #define KVASER_USB_BRP_MIN              1
 169 #define KVASER_USB_BRP_MAX              64
 170 #define KVASER_USB_BRP_INC              1
 171
 172 /* ctrl modes */
 173 #define KVASER_CTRL_MODE_NORMAL         1
 174 #define KVASER_CTRL_MODE_SILENT         2
 175 #define KVASER_CTRL_MODE_SELFRECEPTION  3
 176 #define KVASER_CTRL_MODE_OFF            4
 177
 178 /* Extended CAN identifier flag */
 179 #define KVASER_EXTENDED_FRAME           BIT(31)
 180
 181 /* Kvaser USB CAN dongles are divided into two major families:
 182  * - Leaf: Based on Renesas M32C, running firmware labeled as 'filo'
 183  * - UsbcanII: Based on Renesas M16C, running firmware labeled as 'helios'
 184  */
 185 enum kvaser_usb_family {
 186         KVASER_LEAF,
 187         KVASER_USBCAN,
 188 };
 189
 190 struct kvaser_msg_simple {
 191         u8 tid;
 192         u8 channel;
 193 } __packed;
 194
 195 struct kvaser_msg_cardinfo {
 196         u8 tid;
 197         u8 nchannels;
 198         union {
 199                 struct {
 200                         __le32 serial_number;
 201                         __le32 padding;
 202                 } __packed leaf0;
 203                 struct {
 204                         __le32 serial_number_low;
 205                         __le32 serial_number_high;
 206                 } __packed usbcan0;
 207         } __packed;
 208         __le32 clock_resolution;
 209         __le32 mfgdate;
 210         u8 ean[8];
 211         u8 hw_revision;
 212         union {
 213                 struct {
 214                         u8 usb_hs_mode;
 215                 } __packed leaf1;
 216                 struct {
 217                         u8 padding;
 218                 } __packed usbcan1;
 219         } __packed;
 220         __le16 padding;
 221 } __packed;
 222
 223 struct kvaser_msg_cardinfo2 {
 224         u8 tid;
 225         u8 reserved;
 226         u8 pcb_id[24];
 227         __le32 oem_unlock_code;
 228 } __packed;
 229
 230 struct leaf_msg_softinfo {
 231         u8 tid;
 232         u8 padding0;
 233         __le32 sw_options;
 234         __le32 fw_version;
 235         __le16 max_outstanding_tx;
 236         __le16 padding1[9];
 237 } __packed;
 238
 239 struct usbcan_msg_softinfo {
 240         u8 tid;
 241         u8 fw_name[5];
 242         __le16 max_outstanding_tx;
 243         u8 padding[6];
 244         __le32 fw_version;
 245         __le16 checksum;
 246         __le16 sw_options;
 247 } __packed;
 248
 249 struct kvaser_msg_busparams {
 250         u8 tid;
 251         u8 channel;
 252         __le32 bitrate;
 253         u8 tseg1;
 254         u8 tseg2;
 255         u8 sjw;
 256         u8 no_samp;
 257 } __packed;
 258
 259 struct kvaser_msg_tx_can {
 260         u8 channel;
 261         u8 tid;
 262         u8 msg[14];
 263         union {
 264                 struct {
 265                         u8 padding;
 266                         u8 flags;
 267                 } __packed leaf;
 268                 struct {
 269                         u8 flags;
 270                         u8 padding;
 271                 } __packed usbcan;
 272         } __packed;
 273 } __packed;
 274
 275 struct kvaser_msg_rx_can_header {
 276         u8 channel;
 277         u8 flag;
 278 } __packed;
 279
 280 struct leaf_msg_rx_can {
 281         u8 channel;
 282         u8 flag;
 283
 284         __le16 time[3];
 285         u8 msg[14];
 286 } __packed;
 287
 288 struct usbcan_msg_rx_can {
 289         u8 channel;
 290         u8 flag;
 291
 292         u8 msg[14];
 293         __le16 time;
 294 } __packed;
 295
 296 struct leaf_msg_chip_state_event {
 297         u8 tid;
 298         u8 channel;
 299
 300         __le16 time[3];
 301         u8 tx_errors_count;
 302         u8 rx_errors_count;
 303
 304         u8 status;
 305         u8 padding[3];
 306 } __packed;
 307
 308 struct usbcan_msg_chip_state_event {
 309         u8 tid;
 310         u8 channel;
 311
 312         u8 tx_errors_count;
 313         u8 rx_errors_count;
 314         __le16 time;
 315
 316         u8 status;
 317         u8 padding[3];
 318 } __packed;
 319
 320 struct kvaser_msg_tx_acknowledge_header {
 321         u8 channel;
 322         u8 tid;
 323 } __packed;
 324
 325 struct leaf_msg_tx_acknowledge {
 326         u8 channel;
 327         u8 tid;
 328
 329         __le16 time[3];
 330         u8 flags;
 331         u8 time_offset;
 332 } __packed;
 333
 334 struct usbcan_msg_tx_acknowledge {
 335         u8 channel;
 336         u8 tid;
 337
 338         __le16 time;
 339         __le16 padding;
 340 } __packed;
 341
 342 struct leaf_msg_error_event {
 343         u8 tid;
 344         u8 flags;
 345         __le16 time[3];
 346         u8 channel;
 347         u8 padding;
 348         u8 tx_errors_count;
 349         u8 rx_errors_count;
 350         u8 status;
 351         u8 error_factor;
 352 } __packed;
 353
 354 struct usbcan_msg_error_event {
 355         u8 tid;
 356         u8 padding;
 357         u8 tx_errors_count_ch0;
 358         u8 rx_errors_count_ch0;
 359         u8 tx_errors_count_ch1;
 360         u8 rx_errors_count_ch1;
 361         u8 status_ch0;
 362         u8 status_ch1;
 363         __le16 time;
 364 } __packed;
 365
 366 struct kvaser_msg_ctrl_mode {
 367         u8 tid;
 368         u8 channel;
 369         u8 ctrl_mode;
 370         u8 padding[3];
 371 } __packed;
 372
 373 struct kvaser_msg_flush_queue {
 374         u8 tid;
 375         u8 channel;
 376         u8 flags;
 377         u8 padding[3];
 378 } __packed;
 379
 380 struct leaf_msg_log_message {
 381         u8 channel;
 382         u8 flags;
 383         __le16 time[3];
 384         u8 dlc;
 385         u8 time_offset;
 386         __le32 id;
 387         u8 data[8];
 388 } __packed;
 389
 390 struct kvaser_msg {
 391         u8 len;
 392         u8 id;
 393         union   {
 394                 struct kvaser_msg_simple simple;
 395                 struct kvaser_msg_cardinfo cardinfo;
 396                 struct kvaser_msg_cardinfo2 cardinfo2;
 397                 struct kvaser_msg_busparams busparams;
 398
 399                 struct kvaser_msg_rx_can_header rx_can_header;
 400                 struct kvaser_msg_tx_acknowledge_header tx_acknowledge_header;
 401
 402                 union {
 403                         struct leaf_msg_softinfo softinfo;
 404                         struct leaf_msg_rx_can rx_can;
 405                         struct leaf_msg_chip_state_event chip_state_event;
 406                         struct leaf_msg_tx_acknowledge tx_acknowledge;
 407                         struct leaf_msg_error_event error_event;
 408                         struct leaf_msg_log_message log_message;
 409                 } __packed leaf;
 410
 411                 union {
 412                         struct usbcan_msg_softinfo softinfo;
 413                         struct usbcan_msg_rx_can rx_can;
 414                         struct usbcan_msg_chip_state_event chip_state_event;
 415                         struct usbcan_msg_tx_acknowledge tx_acknowledge;
 416                         struct usbcan_msg_error_event error_event;
 417                 } __packed usbcan;
 418
 419                 struct kvaser_msg_tx_can tx_can;
 420                 struct kvaser_msg_ctrl_mode ctrl_mode;
 421                 struct kvaser_msg_flush_queue flush_queue;
 422         } u;
 423 } __packed;
 424
 425 /* Summary of a kvaser error event, for a unified Leaf/Usbcan error
 426  * handling. Some discrepancies between the two families exist:
 427  *
 428  * - USBCAN firmware does not report M16C "error factors"
 429  * - USBCAN controllers has difficulties reporting if the raised error
 430  *   event is for ch0 or ch1. They leave such arbitration to the OS
 431  *   driver by letting it compare error counters with previous values
 432  *   and decide the error event's channel. Thus for USBCAN, the channel
 433  *   field is only advisory.
 434  */
 435 struct kvaser_usb_error_summary {
 436         u8 channel, status, txerr, rxerr;
 437         union {
 438                 struct {
 439                         u8 error_factor;
 440                 } leaf;
 441                 struct {
 442                         u8 other_ch_status;
 443                         u8 error_state;
 444                 } usbcan;
 445         };
 446 };
 447
 448 /* Context for an outstanding, not yet ACKed, transmission */
 449 struct kvaser_usb_tx_urb_context {
 450         struct kvaser_usb_net_priv *priv;
 451         u32 echo_index;
 452         int dlc;
 453 };
 454
 455 struct kvaser_usb {
 456         struct usb_device *udev;
 457         struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
 458
 459         struct usb_endpoint_descriptor *bulk_in, *bulk_out;
 460         struct usb_anchor rx_submitted;
 461
 462         /* @max_tx_urbs: Firmware-reported maximum number of oustanding,
 463          * not yet ACKed, transmissions on this device. This value is
 464          * also used as a sentinel for marking free tx contexts.
 465          */
 466         u32 fw_version;
 467         unsigned int nchannels;
 468         unsigned int max_tx_urbs;
 469         enum kvaser_usb_family family;
 470
 471         bool rxinitdone;
 472         void *rxbuf[MAX_RX_URBS];
 473         dma_addr_t rxbuf_dma[MAX_RX_URBS];
 474 };
 475
 476 struct kvaser_usb_net_priv {
 477         struct can_priv can;
 478         struct can_berr_counter bec;
 479
 480         struct kvaser_usb *dev;
 481         struct net_device *netdev;
 482         int channel;
 483
 484         struct completion start_comp, stop_comp;
 485         struct usb_anchor tx_submitted;
 486
 487         spinlock_t tx_contexts_lock;
 488         int active_tx_contexts;
 489         struct kvaser_usb_tx_urb_context tx_contexts[];
 490 };
 491
 492 static const struct usb_device_id kvaser_usb_table[] = {
 493         /* Leaf family IDs */
 494         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
 495         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
 496         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
 497                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 498                                KVASER_HAS_SILENT_MODE },
 499         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
 500                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 501                                KVASER_HAS_SILENT_MODE },
 502         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
 503                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 504                                KVASER_HAS_SILENT_MODE },
 505         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
 506                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 507                                KVASER_HAS_SILENT_MODE },
 508         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
 509                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 510                                KVASER_HAS_SILENT_MODE },
 511         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
 512                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 513                                KVASER_HAS_SILENT_MODE },
 514         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
 515                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 516                                KVASER_HAS_SILENT_MODE },
 517         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
 518                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 519                                KVASER_HAS_SILENT_MODE },
 520         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
 521                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 522                                KVASER_HAS_SILENT_MODE },
 523         { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
 524                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 525         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
 526         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
 527                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 528                                KVASER_HAS_SILENT_MODE },
 529         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
 530                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 531         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
 532                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 533         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
 534                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 535         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
 536                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 537         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
 538                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 539         { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
 540                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 541         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
 542         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
 543         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID) },
 544         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_2HS_PRODUCT_ID) },
 545         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_2HS_PRODUCT_ID) },
 546
 547         /* USBCANII family IDs */
 548         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
 549                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 550         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
 551                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 552         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
 553                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 554         { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
 555                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 556
 557         { }
 558 };
 559 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
 560
 561 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
 562                                       struct kvaser_msg *msg)
 563 {
 564         int actual_len;
 565
 566         return usb_bulk_msg(dev->udev,
 567                             usb_sndbulkpipe(dev->udev,
 568                                         dev->bulk_out->bEndpointAddress),
 569                             msg, msg->len, &actual_len,
 570                             USB_SEND_TIMEOUT);
 571 }
 572
 573 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
 574                                struct kvaser_msg *msg)
 575 {
 576         struct kvaser_msg *tmp;
 577         void *buf;
 578         int actual_len;
 579         int err;
 580         int pos;
 581         unsigned long to = jiffies + msecs_to_jiffies(USB_RECV_TIMEOUT);
 582
 583         buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
 584         if (!buf)
 585                 return -ENOMEM;
 586
 587         do {
 588                 err = usb_bulk_msg(dev->udev,
 589                                    usb_rcvbulkpipe(dev->udev,
 590                                         dev->bulk_in->bEndpointAddress),
 591                                    buf, RX_BUFFER_SIZE, &actual_len,
 592                                    USB_RECV_TIMEOUT);
 593                 if (err < 0)
 594                         goto end;
 595
 596                 pos = 0;
 597                 while (pos <= actual_len - MSG_HEADER_LEN) {
 598                         tmp = buf + pos;
 599
 600                         /* Handle messages crossing the USB endpoint max packet
 601                          * size boundary. Check kvaser_usb_read_bulk_callback()
 602                          * for further details.
 603                          */
 604                         if (tmp->len == 0) {
 605                                 pos = round_up(pos, le16_to_cpu(dev->bulk_in->
 606                                                                 wMaxPacketSize));
 607                                 continue;
 608                         }
 609
 610                         if (pos + tmp->len > actual_len) {
 611                                 dev_err(dev->udev->dev.parent,
 612                                         "Format error\n");
 613                                 break;
 614                         }
 615
 616                         if (tmp->id == id) {
 617                                 memcpy(msg, tmp, tmp->len);
 618                                 goto end;
 619                         }
 620
 621                         pos += tmp->len;
 622                 }
 623         } while (time_before(jiffies, to));
 624
 625         err = -EINVAL;
 626
 627 end:
 628         kfree(buf);
 629
 630         return err;
 631 }
 632
 633 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
 634                                       u8 msg_id, int channel)
 635 {
 636         struct kvaser_msg *msg;
 637         int rc;
 638
 639         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 640         if (!msg)
 641                 return -ENOMEM;
 642
 643         msg->id = msg_id;
 644         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 645         msg->u.simple.channel = channel;
 646         msg->u.simple.tid = 0xff;
 647
 648         rc = kvaser_usb_send_msg(dev, msg);
 649
 650         kfree(msg);
 651         return rc;
 652 }
 653
 654 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
 655 {
 656         struct kvaser_msg msg;
 657         int err;
 658
 659         err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
 660         if (err)
 661                 return err;
 662
 663         err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
 664         if (err)
 665                 return err;
 666
 667         switch (dev->family) {
 668         case KVASER_LEAF:
 669                 dev->fw_version = le32_to_cpu(msg.u.leaf.softinfo.fw_version);
 670                 dev->max_tx_urbs =
 671                         le16_to_cpu(msg.u.leaf.softinfo.max_outstanding_tx);
 672                 break;
 673         case KVASER_USBCAN:
 674                 dev->fw_version = le32_to_cpu(msg.u.usbcan.softinfo.fw_version);
 675                 dev->max_tx_urbs =
 676                         le16_to_cpu(msg.u.usbcan.softinfo.max_outstanding_tx);
 677                 break;
 678         }
 679
 680         return 0;
 681 }
 682
 683 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
 684 {
 685         struct kvaser_msg msg;
 686         int err;
 687
 688         err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
 689         if (err)
 690                 return err;
 691
 692         err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
 693         if (err)
 694                 return err;
 695
 696         dev->nchannels = msg.u.cardinfo.nchannels;
 697         if ((dev->nchannels > MAX_NET_DEVICES) ||
 698             (dev->family == KVASER_USBCAN &&
 699              dev->nchannels > MAX_USBCAN_NET_DEVICES))
 700                 return -EINVAL;
 701
 702         return 0;
 703 }
 704
 705 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
 706                                       const struct kvaser_msg *msg)
 707 {
 708         struct net_device_stats *stats;
 709         struct kvaser_usb_tx_urb_context *context;
 710         struct kvaser_usb_net_priv *priv;
 711         struct sk_buff *skb;
 712         struct can_frame *cf;
 713         unsigned long flags;
 714         u8 channel, tid;
 715
 716         channel = msg->u.tx_acknowledge_header.channel;
 717         tid = msg->u.tx_acknowledge_header.tid;
 718
 719         if (channel >= dev->nchannels) {
 720                 dev_err(dev->udev->dev.parent,
 721                         "Invalid channel number (%d)\n", channel);
 722                 return;
 723         }
 724
 725         priv = dev->nets[channel];
 726
 727         if (!netif_device_present(priv->netdev))
 728                 return;
 729
 730         stats = &priv->netdev->stats;
 731
 732         context = &priv->tx_contexts[tid % dev->max_tx_urbs];
 733
 734         /* Sometimes the state change doesn't come after a bus-off event */
 735         if (priv->can.restart_ms &&
 736             (priv->can.state >= CAN_STATE_BUS_OFF)) {
 737                 skb = alloc_can_err_skb(priv->netdev, &cf);
 738                 if (skb) {
 739                         cf->can_id |= CAN_ERR_RESTARTED;
 740
 741                         stats->rx_packets++;
 742                         stats->rx_bytes += cf->can_dlc;
 743                         netif_rx(skb);
 744                 } else {
 745                         netdev_err(priv->netdev,
 746                                    "No memory left for err_skb\n");
 747                 }
 748
 749                 priv->can.can_stats.restarts++;
 750                 netif_carrier_on(priv->netdev);
 751
 752                 priv->can.state = CAN_STATE_ERROR_ACTIVE;
 753         }
 754
 755         stats->tx_packets++;
 756         stats->tx_bytes += context->dlc;
 757
 758         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 759
 760         can_get_echo_skb(priv->netdev, context->echo_index);
 761         context->echo_index = dev->max_tx_urbs;
 762         --priv->active_tx_contexts;
 763         netif_wake_queue(priv->netdev);
 764
 765         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 766 }
 767
 768 static void kvaser_usb_simple_msg_callback(struct urb *urb)
 769 {
 770         struct net_device *netdev = urb->context;
 771
 772         kfree(urb->transfer_buffer);
 773
 774         if (urb->status)
 775                 netdev_warn(netdev, "urb status received: %d\n",
 776                             urb->status);
 777 }
 778
 779 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
 780                                        u8 msg_id)
 781 {
 782         struct kvaser_usb *dev = priv->dev;
 783         struct net_device *netdev = priv->netdev;
 784         struct kvaser_msg *msg;
 785         struct urb *urb;
 786         void *buf;
 787         int err;
 788
 789         urb = usb_alloc_urb(0, GFP_ATOMIC);
 790         if (!urb)
 791                 return -ENOMEM;
 792
 793         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
 794         if (!buf) {
 795                 usb_free_urb(urb);
 796                 return -ENOMEM;
 797         }
 798
 799         msg = (struct kvaser_msg *)buf;
 800         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 801         msg->id = msg_id;
 802         msg->u.simple.channel = priv->channel;
 803
 804         usb_fill_bulk_urb(urb, dev->udev,
 805                           usb_sndbulkpipe(dev->udev,
 806                                           dev->bulk_out->bEndpointAddress),
 807                           buf, msg->len,
 808                           kvaser_usb_simple_msg_callback, netdev);
 809         usb_anchor_urb(urb, &priv->tx_submitted);
 810
 811         err = usb_submit_urb(urb, GFP_ATOMIC);
 812         if (err) {
 813                 netdev_err(netdev, "Error transmitting URB\n");
 814                 usb_unanchor_urb(urb);
 815                 usb_free_urb(urb);
 816                 return err;
 817         }
 818
 819         usb_free_urb(urb);
 820
 821         return 0;
 822 }
 823
 824 static void kvaser_usb_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
 825                                                  const struct kvaser_usb_error_summary *es,
 826                                                  struct can_frame *cf)
 827 {
 828         struct kvaser_usb *dev = priv->dev;
 829         struct net_device_stats *stats = &priv->netdev->stats;
 830         enum can_state cur_state, new_state, tx_state, rx_state;
 831
 832         netdev_dbg(priv->netdev, "Error status: 0x%02x\n", es->status);
 833
 834         new_state = cur_state = priv->can.state;
 835
 836         if (es->status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET))
 837                 new_state = CAN_STATE_BUS_OFF;
 838         else if (es->status & M16C_STATE_BUS_PASSIVE)
 839                 new_state = CAN_STATE_ERROR_PASSIVE;
 840         else if (es->status & M16C_STATE_BUS_ERROR) {
 841                 /* Guard against spurious error events after a busoff */
 842                 if (cur_state < CAN_STATE_BUS_OFF) {
 843                         if ((es->txerr >= 128) || (es->rxerr >= 128))
 844                                 new_state = CAN_STATE_ERROR_PASSIVE;
 845                         else if ((es->txerr >= 96) || (es->rxerr >= 96))
 846                                 new_state = CAN_STATE_ERROR_WARNING;
 847                         else if (cur_state > CAN_STATE_ERROR_ACTIVE)
 848                                 new_state = CAN_STATE_ERROR_ACTIVE;
 849                 }
 850         }
 851
 852         if (!es->status)
 853                 new_state = CAN_STATE_ERROR_ACTIVE;
 854
 855         if (new_state != cur_state) {
 856                 tx_state = (es->txerr >= es->rxerr) ? new_state : 0;
 857                 rx_state = (es->txerr <= es->rxerr) ? new_state : 0;
 858
 859                 can_change_state(priv->netdev, cf, tx_state, rx_state);
 860         }
 861
 862         if (priv->can.restart_ms &&
 863             (cur_state >= CAN_STATE_BUS_OFF) &&
 864             (new_state < CAN_STATE_BUS_OFF)) {
 865                 priv->can.can_stats.restarts++;
 866         }
 867
 868         switch (dev->family) {
 869         case KVASER_LEAF:
 870                 if (es->leaf.error_factor) {
 871                         priv->can.can_stats.bus_error++;
 872                         stats->rx_errors++;
 873                 }
 874                 break;
 875         case KVASER_USBCAN:
 876                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_TX_ERROR)
 877                         stats->tx_errors++;
 878                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_RX_ERROR)
 879                         stats->rx_errors++;
 880                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
 881                         priv->can.can_stats.bus_error++;
 882                 }
 883                 break;
 884         }
 885
 886         priv->bec.txerr = es->txerr;
 887         priv->bec.rxerr = es->rxerr;
 888 }
 889
 890 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
 891                                 const struct kvaser_usb_error_summary *es)
 892 {
 893         struct can_frame *cf, tmp_cf = { .can_id = CAN_ERR_FLAG, .can_dlc = CAN_ERR_DLC };
 894         struct sk_buff *skb;
 895         struct net_device_stats *stats;
 896         struct kvaser_usb_net_priv *priv;
 897         enum can_state old_state, new_state;
 898
 899         if (es->channel >= dev->nchannels) {
 900                 dev_err(dev->udev->dev.parent,
 901                         "Invalid channel number (%d)\n", es->channel);
 902                 return;
 903         }
 904
 905         priv = dev->nets[es->channel];
 906         stats = &priv->netdev->stats;
 907
 908         /* Update all of the can interface's state and error counters before
 909          * trying any memory allocation that can actually fail with -ENOMEM.
 910          *
 911          * We send a temporary stack-allocated error can frame to
 912          * can_change_state() for the very same reason.
 913          *
 914          * TODO: Split can_change_state() responsibility between updating the
 915          * can interface's state and counters, and the setting up of can error
 916          * frame ID and data to userspace. Remove stack allocation afterwards.
 917          */
 918         old_state = priv->can.state;
 919         kvaser_usb_rx_error_update_can_state(priv, es, &tmp_cf);
 920         new_state = priv->can.state;
 921
 922         skb = alloc_can_err_skb(priv->netdev, &cf);
 923         if (!skb) {
 924                 stats->rx_dropped++;
 925                 return;
 926         }
 927         memcpy(cf, &tmp_cf, sizeof(*cf));
 928
 929         if (new_state != old_state) {
 930                 if (es->status &
 931                     (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
 932                         if (!priv->can.restart_ms)
 933                                 kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
 934                         netif_carrier_off(priv->netdev);
 935                 }
 936
 937                 if (priv->can.restart_ms &&
 938                     (old_state >= CAN_STATE_BUS_OFF) &&
 939                     (new_state < CAN_STATE_BUS_OFF)) {
 940                         cf->can_id |= CAN_ERR_RESTARTED;
 941                         netif_carrier_on(priv->netdev);
 942                 }
 943         }
 944
 945         switch (dev->family) {
 946         case KVASER_LEAF:
 947                 if (es->leaf.error_factor) {
 948                         cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
 949
 950                         if (es->leaf.error_factor & M16C_EF_ACKE)
 951                                 cf->data[3] = CAN_ERR_PROT_LOC_ACK;
 952                         if (es->leaf.error_factor & M16C_EF_CRCE)
 953                                 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 954                         if (es->leaf.error_factor & M16C_EF_FORME)
 955                                 cf->data[2] |= CAN_ERR_PROT_FORM;
 956                         if (es->leaf.error_factor & M16C_EF_STFE)
 957                                 cf->data[2] |= CAN_ERR_PROT_STUFF;
 958                         if (es->leaf.error_factor & M16C_EF_BITE0)
 959                                 cf->data[2] |= CAN_ERR_PROT_BIT0;
 960                         if (es->leaf.error_factor & M16C_EF_BITE1)
 961                                 cf->data[2] |= CAN_ERR_PROT_BIT1;
 962                         if (es->leaf.error_factor & M16C_EF_TRE)
 963                                 cf->data[2] |= CAN_ERR_PROT_TX;
 964                 }
 965                 break;
 966         case KVASER_USBCAN:
 967                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
 968                         cf->can_id |= CAN_ERR_BUSERROR;
 969                 }
 970                 break;
 971         }
 972
 973         cf->data[6] = es->txerr;
 974         cf->data[7] = es->rxerr;
 975
 976         stats->rx_packets++;
 977         stats->rx_bytes += cf->can_dlc;
 978         netif_rx(skb);
 979 }
 980
 981 /* For USBCAN, report error to userspace iff the channels's errors counter
 982  * has changed, or we're the only channel seeing a bus error state.
 983  */
 984 static void kvaser_usbcan_conditionally_rx_error(const struct kvaser_usb *dev,
 985                                                  struct kvaser_usb_error_summary *es)
 986 {
 987         struct kvaser_usb_net_priv *priv;
 988         int channel;
 989         bool report_error;
 990
 991         channel = es->channel;
 992         if (channel >= dev->nchannels) {
 993                 dev_err(dev->udev->dev.parent,
 994                         "Invalid channel number (%d)\n", channel);
 995                 return;
 996         }
 997
 998         priv = dev->nets[channel];
 999         report_error = false;
1000
1001         if (es->txerr != priv->bec.txerr) {
1002                 es->usbcan.error_state |= USBCAN_ERROR_STATE_TX_ERROR;
1003                 report_error = true;
1004         }
1005         if (es->rxerr != priv->bec.rxerr) {
1006                 es->usbcan.error_state |= USBCAN_ERROR_STATE_RX_ERROR;
1007                 report_error = true;
1008         }
1009         if ((es->status & M16C_STATE_BUS_ERROR) &&
1010             !(es->usbcan.other_ch_status & M16C_STATE_BUS_ERROR)) {
1011                 es->usbcan.error_state |= USBCAN_ERROR_STATE_BUSERROR;
1012                 report_error = true;
1013         }
1014
1015         if (report_error)
1016                 kvaser_usb_rx_error(dev, es);
1017 }
1018
1019 static void kvaser_usbcan_rx_error(const struct kvaser_usb *dev,
1020                                    const struct kvaser_msg *msg)
1021 {
1022         struct kvaser_usb_error_summary es = { };
1023
1024         switch (msg->id) {
1025         /* Sometimes errors are sent as unsolicited chip state events */
1026         case CMD_CHIP_STATE_EVENT:
1027                 es.channel = msg->u.usbcan.chip_state_event.channel;
1028                 es.status =  msg->u.usbcan.chip_state_event.status;
1029                 es.txerr = msg->u.usbcan.chip_state_event.tx_errors_count;
1030                 es.rxerr = msg->u.usbcan.chip_state_event.rx_errors_count;
1031                 kvaser_usbcan_conditionally_rx_error(dev, &es);
1032                 break;
1033
1034         case CMD_CAN_ERROR_EVENT:
1035                 es.channel = 0;
1036                 es.status = msg->u.usbcan.error_event.status_ch0;
1037                 es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch0;
1038                 es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch0;
1039                 es.usbcan.other_ch_status =
1040                         msg->u.usbcan.error_event.status_ch1;
1041                 kvaser_usbcan_conditionally_rx_error(dev, &es);
1042
1043                 /* The USBCAN firmware supports up to 2 channels.
1044                  * Now that ch0 was checked, check if ch1 has any errors.
1045                  */
1046                 if (dev->nchannels == MAX_USBCAN_NET_DEVICES) {
1047                         es.channel = 1;
1048                         es.status = msg->u.usbcan.error_event.status_ch1;
1049                         es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch1;
1050                         es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch1;
1051                         es.usbcan.other_ch_status =
1052                                 msg->u.usbcan.error_event.status_ch0;
1053                         kvaser_usbcan_conditionally_rx_error(dev, &es);
1054                 }
1055                 break;
1056
1057         default:
1058                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1059                         msg->id);
1060         }
1061 }
1062
1063 static void kvaser_leaf_rx_error(const struct kvaser_usb *dev,
1064                                  const struct kvaser_msg *msg)
1065 {
1066         struct kvaser_usb_error_summary es = { };
1067
1068         switch (msg->id) {
1069         case CMD_CAN_ERROR_EVENT:
1070                 es.channel = msg->u.leaf.error_event.channel;
1071                 es.status =  msg->u.leaf.error_event.status;
1072                 es.txerr = msg->u.leaf.error_event.tx_errors_count;
1073                 es.rxerr = msg->u.leaf.error_event.rx_errors_count;
1074                 es.leaf.error_factor = msg->u.leaf.error_event.error_factor;
1075                 break;
1076         case CMD_LEAF_LOG_MESSAGE:
1077                 es.channel = msg->u.leaf.log_message.channel;
1078                 es.status = msg->u.leaf.log_message.data[0];
1079                 es.txerr = msg->u.leaf.log_message.data[2];
1080                 es.rxerr = msg->u.leaf.log_message.data[3];
1081                 es.leaf.error_factor = msg->u.leaf.log_message.data[1];
1082                 break;
1083         case CMD_CHIP_STATE_EVENT:
1084                 es.channel = msg->u.leaf.chip_state_event.channel;
1085                 es.status =  msg->u.leaf.chip_state_event.status;
1086                 es.txerr = msg->u.leaf.chip_state_event.tx_errors_count;
1087                 es.rxerr = msg->u.leaf.chip_state_event.rx_errors_count;
1088                 es.leaf.error_factor = 0;
1089                 break;
1090         default:
1091                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1092                         msg->id);
1093                 return;
1094         }
1095
1096         kvaser_usb_rx_error(dev, &es);
1097 }
1098
1099 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
1100                                   const struct kvaser_msg *msg)
1101 {
1102         struct can_frame *cf;
1103         struct sk_buff *skb;
1104         struct net_device_stats *stats = &priv->netdev->stats;
1105
1106         if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1107                                          MSG_FLAG_NERR)) {
1108                 netdev_err(priv->netdev, "Unknown error (flags: 0x%02x)\n",
1109                            msg->u.rx_can_header.flag);
1110
1111                 stats->rx_errors++;
1112                 return;
1113         }
1114
1115         if (msg->u.rx_can_header.flag & MSG_FLAG_OVERRUN) {
1116                 stats->rx_over_errors++;
1117                 stats->rx_errors++;
1118
1119                 skb = alloc_can_err_skb(priv->netdev, &cf);
1120                 if (!skb) {
1121                         stats->rx_dropped++;
1122                         return;
1123                 }
1124
1125                 cf->can_id |= CAN_ERR_CRTL;
1126                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
1127
1128                 stats->rx_packets++;
1129                 stats->rx_bytes += cf->can_dlc;
1130                 netif_rx(skb);
1131         }
1132 }
1133
1134 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
1135                                   const struct kvaser_msg *msg)
1136 {
1137         struct kvaser_usb_net_priv *priv;
1138         struct can_frame *cf;
1139         struct sk_buff *skb;
1140         struct net_device_stats *stats;
1141         u8 channel = msg->u.rx_can_header.channel;
1142         const u8 *rx_msg = NULL;        /* GCC */
1143
1144         if (channel >= dev->nchannels) {
1145                 dev_err(dev->udev->dev.parent,
1146                         "Invalid channel number (%d)\n", channel);
1147                 return;
1148         }
1149
1150         priv = dev->nets[channel];
1151         stats = &priv->netdev->stats;
1152
1153         if ((msg->u.rx_can_header.flag & MSG_FLAG_ERROR_FRAME) &&
1154             (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE)) {
1155                 kvaser_leaf_rx_error(dev, msg);
1156                 return;
1157         } else if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1158                                                 MSG_FLAG_NERR |
1159                                                 MSG_FLAG_OVERRUN)) {
1160                 kvaser_usb_rx_can_err(priv, msg);
1161                 return;
1162         } else if (msg->u.rx_can_header.flag & ~MSG_FLAG_REMOTE_FRAME) {
1163                 netdev_warn(priv->netdev,
1164                             "Unhandled frame (flags: 0x%02x)",
1165                             msg->u.rx_can_header.flag);
1166                 return;
1167         }
1168
1169         switch (dev->family) {
1170         case KVASER_LEAF:
1171                 rx_msg = msg->u.leaf.rx_can.msg;
1172                 break;
1173         case KVASER_USBCAN:
1174                 rx_msg = msg->u.usbcan.rx_can.msg;
1175                 break;
1176         }
1177
1178         skb = alloc_can_skb(priv->netdev, &cf);
1179         if (!skb) {
1180                 stats->tx_dropped++;
1181                 return;
1182         }
1183
1184         if (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE) {
1185                 cf->can_id = le32_to_cpu(msg->u.leaf.log_message.id);
1186                 if (cf->can_id & KVASER_EXTENDED_FRAME)
1187                         cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
1188                 else
1189                         cf->can_id &= CAN_SFF_MASK;
1190
1191                 cf->can_dlc = get_can_dlc(msg->u.leaf.log_message.dlc);
1192
1193                 if (msg->u.leaf.log_message.flags & MSG_FLAG_REMOTE_FRAME)
1194                         cf->can_id |= CAN_RTR_FLAG;
1195                 else
1196                         memcpy(cf->data, &msg->u.leaf.log_message.data,
1197                                cf->can_dlc);
1198         } else {
1199                 cf->can_id = ((rx_msg[0] & 0x1f) << 6) | (rx_msg[1] & 0x3f);
1200
1201                 if (msg->id == CMD_RX_EXT_MESSAGE) {
1202                         cf->can_id <<= 18;
1203                         cf->can_id |= ((rx_msg[2] & 0x0f) << 14) |
1204                                       ((rx_msg[3] & 0xff) << 6) |
1205                                       (rx_msg[4] & 0x3f);
1206                         cf->can_id |= CAN_EFF_FLAG;
1207                 }
1208
1209                 cf->can_dlc = get_can_dlc(rx_msg[5]);
1210
1211                 if (msg->u.rx_can_header.flag & MSG_FLAG_REMOTE_FRAME)
1212                         cf->can_id |= CAN_RTR_FLAG;
1213                 else
1214                         memcpy(cf->data, &rx_msg[6],
1215                                cf->can_dlc);
1216         }
1217
1218         stats->rx_packets++;
1219         stats->rx_bytes += cf->can_dlc;
1220         netif_rx(skb);
1221 }
1222
1223 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
1224                                         const struct kvaser_msg *msg)
1225 {
1226         struct kvaser_usb_net_priv *priv;
1227         u8 channel = msg->u.simple.channel;
1228
1229         if (channel >= dev->nchannels) {
1230                 dev_err(dev->udev->dev.parent,
1231                         "Invalid channel number (%d)\n", channel);
1232                 return;
1233         }
1234
1235         priv = dev->nets[channel];
1236
1237         if (completion_done(&priv->start_comp) &&
1238             netif_queue_stopped(priv->netdev)) {
1239                 netif_wake_queue(priv->netdev);
1240         } else {
1241                 netif_start_queue(priv->netdev);
1242                 complete(&priv->start_comp);
1243         }
1244 }
1245
1246 static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
1247                                        const struct kvaser_msg *msg)
1248 {
1249         struct kvaser_usb_net_priv *priv;
1250         u8 channel = msg->u.simple.channel;
1251
1252         if (channel >= dev->nchannels) {
1253                 dev_err(dev->udev->dev.parent,
1254                         "Invalid channel number (%d)\n", channel);
1255                 return;
1256         }
1257
1258         priv = dev->nets[channel];
1259
1260         complete(&priv->stop_comp);
1261 }
1262
1263 static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
1264                                       const struct kvaser_msg *msg)
1265 {
1266         switch (msg->id) {
1267         case CMD_START_CHIP_REPLY:
1268                 kvaser_usb_start_chip_reply(dev, msg);
1269                 break;
1270
1271         case CMD_STOP_CHIP_REPLY:
1272                 kvaser_usb_stop_chip_reply(dev, msg);
1273                 break;
1274
1275         case CMD_RX_STD_MESSAGE:
1276         case CMD_RX_EXT_MESSAGE:
1277                 kvaser_usb_rx_can_msg(dev, msg);
1278                 break;
1279
1280         case CMD_LEAF_LOG_MESSAGE:
1281                 if (dev->family != KVASER_LEAF)
1282                         goto warn;
1283                 kvaser_usb_rx_can_msg(dev, msg);
1284                 break;
1285
1286         case CMD_CHIP_STATE_EVENT:
1287         case CMD_CAN_ERROR_EVENT:
1288                 if (dev->family == KVASER_LEAF)
1289                         kvaser_leaf_rx_error(dev, msg);
1290                 else
1291                         kvaser_usbcan_rx_error(dev, msg);
1292                 break;
1293
1294         case CMD_TX_ACKNOWLEDGE:
1295                 kvaser_usb_tx_acknowledge(dev, msg);
1296                 break;
1297
1298         /* Ignored messages */
1299         case CMD_USBCAN_CLOCK_OVERFLOW_EVENT:
1300                 if (dev->family != KVASER_USBCAN)
1301                         goto warn;
1302                 break;
1303
1304         default:
1305 warn:           dev_warn(dev->udev->dev.parent,
1306                          "Unhandled message (%d)\n", msg->id);
1307                 break;
1308         }
1309 }
1310
1311 static void kvaser_usb_read_bulk_callback(struct urb *urb)
1312 {
1313         struct kvaser_usb *dev = urb->context;
1314         struct kvaser_msg *msg;
1315         int pos = 0;
1316         int err, i;
1317
1318         switch (urb->status) {
1319         case 0:
1320                 break;
1321         case -ENOENT:
1322         case -ESHUTDOWN:
1323                 return;
1324         default:
1325                 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
1326                          urb->status);
1327                 goto resubmit_urb;
1328         }
1329
1330         while (pos <= urb->actual_length - MSG_HEADER_LEN) {
1331                 msg = urb->transfer_buffer + pos;
1332
1333                 /* The Kvaser firmware can only read and write messages that
1334                  * does not cross the USB's endpoint wMaxPacketSize boundary.
1335                  * If a follow-up command crosses such boundary, firmware puts
1336                  * a placeholder zero-length command in its place then aligns
1337                  * the real command to the next max packet size.
1338                  *
1339                  * Handle such cases or we're going to miss a significant
1340                  * number of events in case of a heavy rx load on the bus.
1341                  */
1342                 if (msg->len == 0) {
1343                         pos = round_up(pos, le16_to_cpu(dev->bulk_in->
1344                                                         wMaxPacketSize));
1345                         continue;
1346                 }
1347
1348                 if (pos + msg->len > urb->actual_length) {
1349                         dev_err(dev->udev->dev.parent, "Format error\n");
1350                         break;
1351                 }
1352
1353                 kvaser_usb_handle_message(dev, msg);
1354                 pos += msg->len;
1355         }
1356
1357 resubmit_urb:
1358         usb_fill_bulk_urb(urb, dev->udev,
1359                           usb_rcvbulkpipe(dev->udev,
1360                                           dev->bulk_in->bEndpointAddress),
1361                           urb->transfer_buffer, RX_BUFFER_SIZE,
1362                           kvaser_usb_read_bulk_callback, dev);
1363
1364         err = usb_submit_urb(urb, GFP_ATOMIC);
1365         if (err == -ENODEV) {
1366                 for (i = 0; i < dev->nchannels; i++) {
1367                         if (!dev->nets[i])
1368                                 continue;
1369
1370                         netif_device_detach(dev->nets[i]->netdev);
1371                 }
1372         } else if (err) {
1373                 dev_err(dev->udev->dev.parent,
1374                         "Failed resubmitting read bulk urb: %d\n", err);
1375         }
1376
1377         return;
1378 }
1379
1380 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1381 {
1382         int i, err = 0;
1383
1384         if (dev->rxinitdone)
1385                 return 0;
1386
1387         for (i = 0; i < MAX_RX_URBS; i++) {
1388                 struct urb *urb = NULL;
1389                 u8 *buf = NULL;
1390                 dma_addr_t buf_dma;
1391
1392                 urb = usb_alloc_urb(0, GFP_KERNEL);
1393                 if (!urb) {
1394                         err = -ENOMEM;
1395                         break;
1396                 }
1397
1398                 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1399                                          GFP_KERNEL, &buf_dma);
1400                 if (!buf) {
1401                         dev_warn(dev->udev->dev.parent,
1402                                  "No memory left for USB buffer\n");
1403                         usb_free_urb(urb);
1404                         err = -ENOMEM;
1405                         break;
1406                 }
1407
1408                 usb_fill_bulk_urb(urb, dev->udev,
1409                                   usb_rcvbulkpipe(dev->udev,
1410                                           dev->bulk_in->bEndpointAddress),
1411                                   buf, RX_BUFFER_SIZE,
1412                                   kvaser_usb_read_bulk_callback,
1413                                   dev);
1414                 urb->transfer_dma = buf_dma;
1415                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1416                 usb_anchor_urb(urb, &dev->rx_submitted);
1417
1418                 err = usb_submit_urb(urb, GFP_KERNEL);
1419                 if (err) {
1420                         usb_unanchor_urb(urb);
1421                         usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1422                                           buf_dma);
1423                         usb_free_urb(urb);
1424                         break;
1425                 }
1426
1427                 dev->rxbuf[i] = buf;
1428                 dev->rxbuf_dma[i] = buf_dma;
1429
1430                 usb_free_urb(urb);
1431         }
1432
1433         if (i == 0) {
1434                 dev_warn(dev->udev->dev.parent,
1435                          "Cannot setup read URBs, error %d\n", err);
1436                 return err;
1437         } else if (i < MAX_RX_URBS) {
1438                 dev_warn(dev->udev->dev.parent,
1439                          "RX performances may be slow\n");
1440         }
1441
1442         dev->rxinitdone = true;
1443
1444         return 0;
1445 }
1446
1447 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1448 {
1449         struct kvaser_msg *msg;
1450         int rc;
1451
1452         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1453         if (!msg)
1454                 return -ENOMEM;
1455
1456         msg->id = CMD_SET_CTRL_MODE;
1457         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1458         msg->u.ctrl_mode.tid = 0xff;
1459         msg->u.ctrl_mode.channel = priv->channel;
1460
1461         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1462                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1463         else
1464                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1465
1466         rc = kvaser_usb_send_msg(priv->dev, msg);
1467
1468         kfree(msg);
1469         return rc;
1470 }
1471
1472 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1473 {
1474         int err;
1475
1476         init_completion(&priv->start_comp);
1477
1478         err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1479                                          priv->channel);
1480         if (err)
1481                 return err;
1482
1483         if (!wait_for_completion_timeout(&priv->start_comp,
1484                                          msecs_to_jiffies(START_TIMEOUT)))
1485                 return -ETIMEDOUT;
1486
1487         return 0;
1488 }
1489
1490 static int kvaser_usb_open(struct net_device *netdev)
1491 {
1492         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1493         struct kvaser_usb *dev = priv->dev;
1494         int err;
1495
1496         err = open_candev(netdev);
1497         if (err)
1498                 return err;
1499
1500         err = kvaser_usb_setup_rx_urbs(dev);
1501         if (err)
1502                 goto error;
1503
1504         err = kvaser_usb_set_opt_mode(priv);
1505         if (err)
1506                 goto error;
1507
1508         err = kvaser_usb_start_chip(priv);
1509         if (err) {
1510                 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1511                 goto error;
1512         }
1513
1514         priv->can.state = CAN_STATE_ERROR_ACTIVE;
1515
1516         return 0;
1517
1518 error:
1519         close_candev(netdev);
1520         return err;
1521 }
1522
1523 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
1524 {
1525         int i, max_tx_urbs;
1526
1527         max_tx_urbs = priv->dev->max_tx_urbs;
1528
1529         priv->active_tx_contexts = 0;
1530         for (i = 0; i < max_tx_urbs; i++)
1531                 priv->tx_contexts[i].echo_index = max_tx_urbs;
1532 }
1533
1534 /* This method might sleep. Do not call it in the atomic context
1535  * of URB completions.
1536  */
1537 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
1538 {
1539         usb_kill_anchored_urbs(&priv->tx_submitted);
1540         kvaser_usb_reset_tx_urb_contexts(priv);
1541 }
1542
1543 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1544 {
1545         int i;
1546
1547         usb_kill_anchored_urbs(&dev->rx_submitted);
1548
1549         for (i = 0; i < MAX_RX_URBS; i++)
1550                 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1551                                   dev->rxbuf[i],
1552                                   dev->rxbuf_dma[i]);
1553
1554         for (i = 0; i < dev->nchannels; i++) {
1555                 struct kvaser_usb_net_priv *priv = dev->nets[i];
1556
1557                 if (priv)
1558                         kvaser_usb_unlink_tx_urbs(priv);
1559         }
1560 }
1561
1562 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1563 {
1564         int err;
1565
1566         init_completion(&priv->stop_comp);
1567
1568         err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1569                                          priv->channel);
1570         if (err)
1571                 return err;
1572
1573         if (!wait_for_completion_timeout(&priv->stop_comp,
1574                                          msecs_to_jiffies(STOP_TIMEOUT)))
1575                 return -ETIMEDOUT;
1576
1577         return 0;
1578 }
1579
1580 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1581 {
1582         struct kvaser_msg *msg;
1583         int rc;
1584
1585         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1586         if (!msg)
1587                 return -ENOMEM;
1588
1589         msg->id = CMD_FLUSH_QUEUE;
1590         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1591         msg->u.flush_queue.channel = priv->channel;
1592         msg->u.flush_queue.flags = 0x00;
1593
1594         rc = kvaser_usb_send_msg(priv->dev, msg);
1595
1596         kfree(msg);
1597         return rc;
1598 }
1599
1600 static int kvaser_usb_close(struct net_device *netdev)
1601 {
1602         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1603         struct kvaser_usb *dev = priv->dev;
1604         int err;
1605
1606         netif_stop_queue(netdev);
1607
1608         err = kvaser_usb_flush_queue(priv);
1609         if (err)
1610                 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1611
1612         if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel))
1613                 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1614
1615         err = kvaser_usb_stop_chip(priv);
1616         if (err)
1617                 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1618
1619         /* reset tx contexts */
1620         kvaser_usb_unlink_tx_urbs(priv);
1621
1622         priv->can.state = CAN_STATE_STOPPED;
1623         close_candev(priv->netdev);
1624
1625         return 0;
1626 }
1627
1628 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1629 {
1630         struct kvaser_usb_tx_urb_context *context = urb->context;
1631         struct kvaser_usb_net_priv *priv;
1632         struct net_device *netdev;
1633
1634         if (WARN_ON(!context))
1635                 return;
1636
1637         priv = context->priv;
1638         netdev = priv->netdev;
1639
1640         kfree(urb->transfer_buffer);
1641
1642         if (!netif_device_present(netdev))
1643                 return;
1644
1645         if (urb->status)
1646                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1647 }
1648
1649 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1650                                          struct net_device *netdev)
1651 {
1652         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1653         struct kvaser_usb *dev = priv->dev;
1654         struct net_device_stats *stats = &netdev->stats;
1655         struct can_frame *cf = (struct can_frame *)skb->data;
1656         struct kvaser_usb_tx_urb_context *context = NULL;
1657         struct urb *urb;
1658         void *buf;
1659         struct kvaser_msg *msg;
1660         int i, err, ret = NETDEV_TX_OK;
1661         u8 *msg_tx_can_flags = NULL;            /* GCC */
1662         unsigned long flags;
1663
1664         if (can_dropped_invalid_skb(netdev, skb))
1665                 return NETDEV_TX_OK;
1666
1667         urb = usb_alloc_urb(0, GFP_ATOMIC);
1668         if (!urb) {
1669                 stats->tx_dropped++;
1670                 dev_kfree_skb(skb);
1671                 return NETDEV_TX_OK;
1672         }
1673
1674         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1675         if (!buf) {
1676                 stats->tx_dropped++;
1677                 dev_kfree_skb(skb);
1678                 goto freeurb;
1679         }
1680
1681         msg = buf;
1682         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1683         msg->u.tx_can.channel = priv->channel;
1684
1685         switch (dev->family) {
1686         case KVASER_LEAF:
1687                 msg_tx_can_flags = &msg->u.tx_can.leaf.flags;
1688                 break;
1689         case KVASER_USBCAN:
1690                 msg_tx_can_flags = &msg->u.tx_can.usbcan.flags;
1691                 break;
1692         }
1693
1694         *msg_tx_can_flags = 0;
1695
1696         if (cf->can_id & CAN_EFF_FLAG) {
1697                 msg->id = CMD_TX_EXT_MESSAGE;
1698                 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1699                 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1700                 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1701                 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1702                 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1703         } else {
1704                 msg->id = CMD_TX_STD_MESSAGE;
1705                 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1706                 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1707         }
1708
1709         msg->u.tx_can.msg[5] = cf->can_dlc;
1710         memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1711
1712         if (cf->can_id & CAN_RTR_FLAG)
1713                 *msg_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
1714
1715         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1716         for (i = 0; i < dev->max_tx_urbs; i++) {
1717                 if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
1718                         context = &priv->tx_contexts[i];
1719
1720                         context->echo_index = i;
1721                         can_put_echo_skb(skb, netdev, context->echo_index);
1722                         ++priv->active_tx_contexts;
1723                         if (priv->active_tx_contexts >= dev->max_tx_urbs)
1724                                 netif_stop_queue(netdev);
1725
1726                         break;
1727                 }
1728         }
1729         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1730
1731         /* This should never happen; it implies a flow control bug */
1732         if (!context) {
1733                 netdev_warn(netdev, "cannot find free context\n");
1734
1735                 kfree(buf);
1736                 ret =  NETDEV_TX_BUSY;
1737                 goto freeurb;
1738         }
1739
1740         context->priv = priv;
1741         context->dlc = cf->can_dlc;
1742
1743         msg->u.tx_can.tid = context->echo_index;
1744
1745         usb_fill_bulk_urb(urb, dev->udev,
1746                           usb_sndbulkpipe(dev->udev,
1747                                           dev->bulk_out->bEndpointAddress),
1748                           buf, msg->len,
1749                           kvaser_usb_write_bulk_callback, context);
1750         usb_anchor_urb(urb, &priv->tx_submitted);
1751
1752         err = usb_submit_urb(urb, GFP_ATOMIC);
1753         if (unlikely(err)) {
1754                 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1755
1756                 can_free_echo_skb(netdev, context->echo_index);
1757                 context->echo_index = dev->max_tx_urbs;
1758                 --priv->active_tx_contexts;
1759                 netif_wake_queue(netdev);
1760
1761                 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1762
1763                 usb_unanchor_urb(urb);
1764
1765                 stats->tx_dropped++;
1766
1767                 if (err == -ENODEV)
1768                         netif_device_detach(netdev);
1769                 else
1770                         netdev_warn(netdev, "Failed tx_urb %d\n", err);
1771
1772                 goto freeurb;
1773         }
1774
1775         ret = NETDEV_TX_OK;
1776
1777 freeurb:
1778         usb_free_urb(urb);
1779         return ret;
1780 }
1781
1782 static const struct net_device_ops kvaser_usb_netdev_ops = {
1783         .ndo_open = kvaser_usb_open,
1784         .ndo_stop = kvaser_usb_close,
1785         .ndo_start_xmit = kvaser_usb_start_xmit,
1786         .ndo_change_mtu = can_change_mtu,
1787 };
1788
1789 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1790         .name = "kvaser_usb",
1791         .tseg1_min = KVASER_USB_TSEG1_MIN,
1792         .tseg1_max = KVASER_USB_TSEG1_MAX,
1793         .tseg2_min = KVASER_USB_TSEG2_MIN,
1794         .tseg2_max = KVASER_USB_TSEG2_MAX,
1795         .sjw_max = KVASER_USB_SJW_MAX,
1796         .brp_min = KVASER_USB_BRP_MIN,
1797         .brp_max = KVASER_USB_BRP_MAX,
1798         .brp_inc = KVASER_USB_BRP_INC,
1799 };
1800
1801 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1802 {
1803         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1804         struct can_bittiming *bt = &priv->can.bittiming;
1805         struct kvaser_usb *dev = priv->dev;
1806         struct kvaser_msg *msg;
1807         int rc;
1808
1809         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1810         if (!msg)
1811                 return -ENOMEM;
1812
1813         msg->id = CMD_SET_BUS_PARAMS;
1814         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1815         msg->u.busparams.channel = priv->channel;
1816         msg->u.busparams.tid = 0xff;
1817         msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1818         msg->u.busparams.sjw = bt->sjw;
1819         msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1820         msg->u.busparams.tseg2 = bt->phase_seg2;
1821
1822         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1823                 msg->u.busparams.no_samp = 3;
1824         else
1825                 msg->u.busparams.no_samp = 1;
1826
1827         rc = kvaser_usb_send_msg(dev, msg);
1828
1829         kfree(msg);
1830         return rc;
1831 }
1832
1833 static int kvaser_usb_set_mode(struct net_device *netdev,
1834                                enum can_mode mode)
1835 {
1836         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1837         int err;
1838
1839         switch (mode) {
1840         case CAN_MODE_START:
1841                 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1842                 if (err)
1843                         return err;
1844                 break;
1845         default:
1846                 return -EOPNOTSUPP;
1847         }
1848
1849         return 0;
1850 }
1851
1852 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1853                                        struct can_berr_counter *bec)
1854 {
1855         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1856
1857         *bec = priv->bec;
1858
1859         return 0;
1860 }
1861
1862 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1863 {
1864         int i;
1865
1866         for (i = 0; i < dev->nchannels; i++) {
1867                 if (!dev->nets[i])
1868                         continue;
1869
1870                 unregister_candev(dev->nets[i]->netdev);
1871         }
1872
1873         kvaser_usb_unlink_all_urbs(dev);
1874
1875         for (i = 0; i < dev->nchannels; i++) {
1876                 if (!dev->nets[i])
1877                         continue;
1878
1879                 free_candev(dev->nets[i]->netdev);
1880         }
1881 }
1882
1883 static int kvaser_usb_init_one(struct usb_interface *intf,
1884                                const struct usb_device_id *id, int channel)
1885 {
1886         struct kvaser_usb *dev = usb_get_intfdata(intf);
1887         struct net_device *netdev;
1888         struct kvaser_usb_net_priv *priv;
1889         int err;
1890
1891         err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
1892         if (err)
1893                 return err;
1894
1895         netdev = alloc_candev(sizeof(*priv) +
1896                               dev->max_tx_urbs * sizeof(*priv->tx_contexts),
1897                               dev->max_tx_urbs);
1898         if (!netdev) {
1899                 dev_err(&intf->dev, "Cannot alloc candev\n");
1900                 return -ENOMEM;
1901         }
1902
1903         priv = netdev_priv(netdev);
1904
1905         init_usb_anchor(&priv->tx_submitted);
1906         init_completion(&priv->start_comp);
1907         init_completion(&priv->stop_comp);
1908
1909         priv->dev = dev;
1910         priv->netdev = netdev;
1911         priv->channel = channel;
1912
1913         spin_lock_init(&priv->tx_contexts_lock);
1914         kvaser_usb_reset_tx_urb_contexts(priv);
1915
1916         priv->can.state = CAN_STATE_STOPPED;
1917         priv->can.clock.freq = CAN_USB_CLOCK;
1918         priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1919         priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1920         priv->can.do_set_mode = kvaser_usb_set_mode;
1921         if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1922                 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1923         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1924         if (id->driver_info & KVASER_HAS_SILENT_MODE)
1925                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1926
1927         netdev->flags |= IFF_ECHO;
1928
1929         netdev->netdev_ops = &kvaser_usb_netdev_ops;
1930
1931         SET_NETDEV_DEV(netdev, &intf->dev);
1932         netdev->dev_id = channel;
1933
1934         dev->nets[channel] = priv;
1935
1936         err = register_candev(netdev);
1937         if (err) {
1938                 dev_err(&intf->dev, "Failed to register can device\n");
1939                 free_candev(netdev);
1940                 dev->nets[channel] = NULL;
1941                 return err;
1942         }
1943
1944         netdev_dbg(netdev, "device registered\n");
1945
1946         return 0;
1947 }
1948
1949 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1950                                     struct usb_endpoint_descriptor **in,
1951                                     struct usb_endpoint_descriptor **out)
1952 {
1953         const struct usb_host_interface *iface_desc;
1954         struct usb_endpoint_descriptor *endpoint;
1955         int i;
1956
1957         iface_desc = &intf->altsetting[0];
1958
1959         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1960                 endpoint = &iface_desc->endpoint[i].desc;
1961
1962                 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1963                         *in = endpoint;
1964
1965                 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1966                         *out = endpoint;
1967
1968                 /* use first bulk endpoint for in and out */
1969                 if (*in && *out)
1970                         return 0;
1971         }
1972
1973         return -ENODEV;
1974 }
1975
1976 static int kvaser_usb_probe(struct usb_interface *intf,
1977                             const struct usb_device_id *id)
1978 {
1979         struct kvaser_usb *dev;
1980         int err = -ENOMEM;
1981         int i, retry = 3;
1982
1983         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1984         if (!dev)
1985                 return -ENOMEM;
1986
1987         if (kvaser_is_leaf(id)) {
1988                 dev->family = KVASER_LEAF;
1989         } else if (kvaser_is_usbcan(id)) {
1990                 dev->family = KVASER_USBCAN;
1991         } else {
1992                 dev_err(&intf->dev,
1993                         "Product ID (%d) does not belong to any known Kvaser USB family",
1994                         id->idProduct);
1995                 return -ENODEV;
1996         }
1997
1998         err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
1999         if (err) {
2000                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
2001                 return err;
2002         }
2003
2004         dev->udev = interface_to_usbdev(intf);
2005
2006         init_usb_anchor(&dev->rx_submitted);
2007
2008         usb_set_intfdata(intf, dev);
2009
2010         /* On some x86 laptops, plugging a Kvaser device again after
2011          * an unplug makes the firmware always ignore the very first
2012          * command. For such a case, provide some room for retries
2013          * instead of completely exiting the driver.
2014          */
2015         do {
2016                 err = kvaser_usb_get_software_info(dev);
2017         } while (--retry && err == -ETIMEDOUT);
2018
2019         if (err) {
2020                 dev_err(&intf->dev,
2021                         "Cannot get software infos, error %d\n", err);
2022                 return err;
2023         }
2024
2025         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
2026                 ((dev->fw_version >> 24) & 0xff),
2027                 ((dev->fw_version >> 16) & 0xff),
2028                 (dev->fw_version & 0xffff));
2029
2030         dev_dbg(&intf->dev, "Max oustanding tx = %d URBs\n", dev->max_tx_urbs);
2031
2032         err = kvaser_usb_get_card_info(dev);
2033         if (err) {
2034                 dev_err(&intf->dev,
2035                         "Cannot get card infos, error %d\n", err);
2036                 return err;
2037         }
2038
2039         for (i = 0; i < dev->nchannels; i++) {
2040                 err = kvaser_usb_init_one(intf, id, i);
2041                 if (err) {
2042                         kvaser_usb_remove_interfaces(dev);
2043                         return err;
2044                 }
2045         }
2046
2047         return 0;
2048 }
2049
2050 static void kvaser_usb_disconnect(struct usb_interface *intf)
2051 {
2052         struct kvaser_usb *dev = usb_get_intfdata(intf);
2053
2054         usb_set_intfdata(intf, NULL);
2055
2056         if (!dev)
2057                 return;
2058
2059         kvaser_usb_remove_interfaces(dev);
2060 }
2061
2062 static struct usb_driver kvaser_usb_driver = {
2063         .name = "kvaser_usb",
2064         .probe = kvaser_usb_probe,
2065         .disconnect = kvaser_usb_disconnect,
2066         .id_table = kvaser_usb_table,
2067 };
2068
2069 module_usb_driver(kvaser_usb_driver);
2070
2071 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
2072 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
2073 MODULE_LICENSE("GPL v2");