kernel/drivers/net/can/usb/kvaser_usb.c

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