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  *
  10  * Copyright (C) 2002-2006 KVASER AB, Sweden. All rights reserved.
  11  * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
  12  * Copyright (C) 2012 Olivier Sobrie <olivier@sobrie.be>
  13  */
  14
  15 #include <linux/completion.h>
  16 #include <linux/module.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/usb.h>
  19
  20 #include <linux/can.h>
  21 #include <linux/can/dev.h>
  22 #include <linux/can/error.h>
  23
  24 #define MAX_TX_URBS                     16
  25 #define MAX_RX_URBS                     4
  26 #define START_TIMEOUT                   1000 /* msecs */
  27 #define STOP_TIMEOUT                    1000 /* msecs */
  28 #define USB_SEND_TIMEOUT                1000 /* msecs */
  29 #define USB_RECV_TIMEOUT                1000 /* msecs */
  30 #define RX_BUFFER_SIZE                  3072
  31 #define CAN_USB_CLOCK                   8000000
  32 #define MAX_NET_DEVICES                 3
  33
  34 /* Kvaser USB devices */
  35 #define KVASER_VENDOR_ID                0x0bfd
  36 #define USB_LEAF_DEVEL_PRODUCT_ID       10
  37 #define USB_LEAF_LITE_PRODUCT_ID        11
  38 #define USB_LEAF_PRO_PRODUCT_ID         12
  39 #define USB_LEAF_SPRO_PRODUCT_ID        14
  40 #define USB_LEAF_PRO_LS_PRODUCT_ID      15
  41 #define USB_LEAF_PRO_SWC_PRODUCT_ID     16
  42 #define USB_LEAF_PRO_LIN_PRODUCT_ID     17
  43 #define USB_LEAF_SPRO_LS_PRODUCT_ID     18
  44 #define USB_LEAF_SPRO_SWC_PRODUCT_ID    19
  45 #define USB_MEMO2_DEVEL_PRODUCT_ID      22
  46 #define USB_MEMO2_HSHS_PRODUCT_ID       23
  47 #define USB_UPRO_HSHS_PRODUCT_ID        24
  48 #define USB_LEAF_LITE_GI_PRODUCT_ID     25
  49 #define USB_LEAF_PRO_OBDII_PRODUCT_ID   26
  50 #define USB_MEMO2_HSLS_PRODUCT_ID       27
  51 #define USB_LEAF_LITE_CH_PRODUCT_ID     28
  52 #define USB_BLACKBIRD_SPRO_PRODUCT_ID   29
  53 #define USB_OEM_MERCURY_PRODUCT_ID      34
  54 #define USB_OEM_LEAF_PRODUCT_ID         35
  55 #define USB_CAN_R_PRODUCT_ID            39
  56 #define USB_LEAF_LITE_V2_PRODUCT_ID     288
  57 #define USB_MINI_PCIE_HS_PRODUCT_ID     289
  58
  59 /* USB devices features */
  60 #define KVASER_HAS_SILENT_MODE          BIT(0)
  61 #define KVASER_HAS_TXRX_ERRORS          BIT(1)
  62
  63 /* Message header size */
  64 #define MSG_HEADER_LEN                  2
  65
  66 /* Can message flags */
  67 #define MSG_FLAG_ERROR_FRAME            BIT(0)
  68 #define MSG_FLAG_OVERRUN                BIT(1)
  69 #define MSG_FLAG_NERR                   BIT(2)
  70 #define MSG_FLAG_WAKEUP                 BIT(3)
  71 #define MSG_FLAG_REMOTE_FRAME           BIT(4)
  72 #define MSG_FLAG_RESERVED               BIT(5)
  73 #define MSG_FLAG_TX_ACK                 BIT(6)
  74 #define MSG_FLAG_TX_REQUEST             BIT(7)
  75
  76 /* Can states */
  77 #define M16C_STATE_BUS_RESET            BIT(0)
  78 #define M16C_STATE_BUS_ERROR            BIT(4)
  79 #define M16C_STATE_BUS_PASSIVE          BIT(5)
  80 #define M16C_STATE_BUS_OFF              BIT(6)
  81
  82 /* Can msg ids */
  83 #define CMD_RX_STD_MESSAGE              12
  84 #define CMD_TX_STD_MESSAGE              13
  85 #define CMD_RX_EXT_MESSAGE              14
  86 #define CMD_TX_EXT_MESSAGE              15
  87 #define CMD_SET_BUS_PARAMS              16
  88 #define CMD_GET_BUS_PARAMS              17
  89 #define CMD_GET_BUS_PARAMS_REPLY        18
  90 #define CMD_GET_CHIP_STATE              19
  91 #define CMD_CHIP_STATE_EVENT            20
  92 #define CMD_SET_CTRL_MODE               21
  93 #define CMD_GET_CTRL_MODE               22
  94 #define CMD_GET_CTRL_MODE_REPLY         23
  95 #define CMD_RESET_CHIP                  24
  96 #define CMD_RESET_CARD                  25
  97 #define CMD_START_CHIP                  26
  98 #define CMD_START_CHIP_REPLY            27
  99 #define CMD_STOP_CHIP                   28
 100 #define CMD_STOP_CHIP_REPLY             29
 101 #define CMD_GET_CARD_INFO2              32
 102 #define CMD_GET_CARD_INFO               34
 103 #define CMD_GET_CARD_INFO_REPLY         35
 104 #define CMD_GET_SOFTWARE_INFO           38
 105 #define CMD_GET_SOFTWARE_INFO_REPLY     39
 106 #define CMD_ERROR_EVENT                 45
 107 #define CMD_FLUSH_QUEUE                 48
 108 #define CMD_RESET_ERROR_COUNTER         49
 109 #define CMD_TX_ACKNOWLEDGE              50
 110 #define CMD_CAN_ERROR_EVENT             51
 111 #define CMD_USB_THROTTLE                77
 112 #define CMD_LOG_MESSAGE                 106
 113
 114 /* error factors */
 115 #define M16C_EF_ACKE                    BIT(0)
 116 #define M16C_EF_CRCE                    BIT(1)
 117 #define M16C_EF_FORME                   BIT(2)
 118 #define M16C_EF_STFE                    BIT(3)
 119 #define M16C_EF_BITE0                   BIT(4)
 120 #define M16C_EF_BITE1                   BIT(5)
 121 #define M16C_EF_RCVE                    BIT(6)
 122 #define M16C_EF_TRE                     BIT(7)
 123
 124 /* bittiming parameters */
 125 #define KVASER_USB_TSEG1_MIN            1
 126 #define KVASER_USB_TSEG1_MAX            16
 127 #define KVASER_USB_TSEG2_MIN            1
 128 #define KVASER_USB_TSEG2_MAX            8
 129 #define KVASER_USB_SJW_MAX              4
 130 #define KVASER_USB_BRP_MIN              1
 131 #define KVASER_USB_BRP_MAX              64
 132 #define KVASER_USB_BRP_INC              1
 133
 134 /* ctrl modes */
 135 #define KVASER_CTRL_MODE_NORMAL         1
 136 #define KVASER_CTRL_MODE_SILENT         2
 137 #define KVASER_CTRL_MODE_SELFRECEPTION  3
 138 #define KVASER_CTRL_MODE_OFF            4
 139
 140 /* log message */
 141 #define KVASER_EXTENDED_FRAME           BIT(31)
 142
 143 struct kvaser_msg_simple {
 144         u8 tid;
 145         u8 channel;
 146 } __packed;
 147
 148 struct kvaser_msg_cardinfo {
 149         u8 tid;
 150         u8 nchannels;
 151         __le32 serial_number;
 152         __le32 padding;
 153         __le32 clock_resolution;
 154         __le32 mfgdate;
 155         u8 ean[8];
 156         u8 hw_revision;
 157         u8 usb_hs_mode;
 158         __le16 padding2;
 159 } __packed;
 160
 161 struct kvaser_msg_cardinfo2 {
 162         u8 tid;
 163         u8 channel;
 164         u8 pcb_id[24];
 165         __le32 oem_unlock_code;
 166 } __packed;
 167
 168 struct kvaser_msg_softinfo {
 169         u8 tid;
 170         u8 channel;
 171         __le32 sw_options;
 172         __le32 fw_version;
 173         __le16 max_outstanding_tx;
 174         __le16 padding[9];
 175 } __packed;
 176
 177 struct kvaser_msg_busparams {
 178         u8 tid;
 179         u8 channel;
 180         __le32 bitrate;
 181         u8 tseg1;
 182         u8 tseg2;
 183         u8 sjw;
 184         u8 no_samp;
 185 } __packed;
 186
 187 struct kvaser_msg_tx_can {
 188         u8 channel;
 189         u8 tid;
 190         u8 msg[14];
 191         u8 padding;
 192         u8 flags;
 193 } __packed;
 194
 195 struct kvaser_msg_rx_can {
 196         u8 channel;
 197         u8 flag;
 198         __le16 time[3];
 199         u8 msg[14];
 200 } __packed;
 201
 202 struct kvaser_msg_chip_state_event {
 203         u8 tid;
 204         u8 channel;
 205         __le16 time[3];
 206         u8 tx_errors_count;
 207         u8 rx_errors_count;
 208         u8 status;
 209         u8 padding[3];
 210 } __packed;
 211
 212 struct kvaser_msg_tx_acknowledge {
 213         u8 channel;
 214         u8 tid;
 215         __le16 time[3];
 216         u8 flags;
 217         u8 time_offset;
 218 } __packed;
 219
 220 struct kvaser_msg_error_event {
 221         u8 tid;
 222         u8 flags;
 223         __le16 time[3];
 224         u8 channel;
 225         u8 padding;
 226         u8 tx_errors_count;
 227         u8 rx_errors_count;
 228         u8 status;
 229         u8 error_factor;
 230 } __packed;
 231
 232 struct kvaser_msg_ctrl_mode {
 233         u8 tid;
 234         u8 channel;
 235         u8 ctrl_mode;
 236         u8 padding[3];
 237 } __packed;
 238
 239 struct kvaser_msg_flush_queue {
 240         u8 tid;
 241         u8 channel;
 242         u8 flags;
 243         u8 padding[3];
 244 } __packed;
 245
 246 struct kvaser_msg_log_message {
 247         u8 channel;
 248         u8 flags;
 249         __le16 time[3];
 250         u8 dlc;
 251         u8 time_offset;
 252         __le32 id;
 253         u8 data[8];
 254 } __packed;
 255
 256 struct kvaser_msg {
 257         u8 len;
 258         u8 id;
 259         union   {
 260                 struct kvaser_msg_simple simple;
 261                 struct kvaser_msg_cardinfo cardinfo;
 262                 struct kvaser_msg_cardinfo2 cardinfo2;
 263                 struct kvaser_msg_softinfo softinfo;
 264                 struct kvaser_msg_busparams busparams;
 265                 struct kvaser_msg_tx_can tx_can;
 266                 struct kvaser_msg_rx_can rx_can;
 267                 struct kvaser_msg_chip_state_event chip_state_event;
 268                 struct kvaser_msg_tx_acknowledge tx_acknowledge;
 269                 struct kvaser_msg_error_event error_event;
 270                 struct kvaser_msg_ctrl_mode ctrl_mode;
 271                 struct kvaser_msg_flush_queue flush_queue;
 272                 struct kvaser_msg_log_message log_message;
 273         } u;
 274 } __packed;
 275
 276 struct kvaser_usb_tx_urb_context {
 277         struct kvaser_usb_net_priv *priv;
 278         u32 echo_index;
 279         int dlc;
 280 };
 281
 282 struct kvaser_usb {
 283         struct usb_device *udev;
 284         struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
 285
 286         struct usb_endpoint_descriptor *bulk_in, *bulk_out;
 287         struct usb_anchor rx_submitted;
 288
 289         u32 fw_version;
 290         unsigned int nchannels;
 291
 292         bool rxinitdone;
 293         void *rxbuf[MAX_RX_URBS];
 294         dma_addr_t rxbuf_dma[MAX_RX_URBS];
 295 };
 296
 297 struct kvaser_usb_net_priv {
 298         struct can_priv can;
 299
 300         atomic_t active_tx_urbs;
 301         struct usb_anchor tx_submitted;
 302         struct kvaser_usb_tx_urb_context tx_contexts[MAX_TX_URBS];
 303
 304         struct completion start_comp, stop_comp;
 305
 306         struct kvaser_usb *dev;
 307         struct net_device *netdev;
 308         int channel;
 309
 310         struct can_berr_counter bec;
 311 };
 312
 313 static const struct usb_device_id kvaser_usb_table[] = {
 314         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
 315         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
 316         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
 317                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 318                                KVASER_HAS_SILENT_MODE },
 319         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
 320                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 321                                KVASER_HAS_SILENT_MODE },
 322         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
 323                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 324                                KVASER_HAS_SILENT_MODE },
 325         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
 326                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 327                                KVASER_HAS_SILENT_MODE },
 328         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
 329                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 330                                KVASER_HAS_SILENT_MODE },
 331         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
 332                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 333                                KVASER_HAS_SILENT_MODE },
 334         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
 335                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 336                                KVASER_HAS_SILENT_MODE },
 337         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
 338                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 339                                KVASER_HAS_SILENT_MODE },
 340         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
 341                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 342                                KVASER_HAS_SILENT_MODE },
 343         { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
 344                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 345         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
 346         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
 347                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 348                                KVASER_HAS_SILENT_MODE },
 349         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
 350                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 351         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
 352                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 353         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
 354                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 355         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
 356                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 357         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
 358                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 359         { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
 360                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 361         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
 362         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
 363         { }
 364 };
 365 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
 366
 367 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
 368                                       struct kvaser_msg *msg)
 369 {
 370         int actual_len;
 371
 372         return usb_bulk_msg(dev->udev,
 373                             usb_sndbulkpipe(dev->udev,
 374                                         dev->bulk_out->bEndpointAddress),
 375                             msg, msg->len, &actual_len,
 376                             USB_SEND_TIMEOUT);
 377 }
 378
 379 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
 380                                struct kvaser_msg *msg)
 381 {
 382         struct kvaser_msg *tmp;
 383         void *buf;
 384         int actual_len;
 385         int err;
 386         int pos;
 387         unsigned long to = jiffies + msecs_to_jiffies(USB_RECV_TIMEOUT);
 388
 389         buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
 390         if (!buf)
 391                 return -ENOMEM;
 392
 393         do {
 394                 err = usb_bulk_msg(dev->udev,
 395                                    usb_rcvbulkpipe(dev->udev,
 396                                         dev->bulk_in->bEndpointAddress),
 397                                    buf, RX_BUFFER_SIZE, &actual_len,
 398                                    USB_RECV_TIMEOUT);
 399                 if (err < 0)
 400                         goto end;
 401
 402                 pos = 0;
 403                 while (pos <= actual_len - MSG_HEADER_LEN) {
 404                         tmp = buf + pos;
 405
 406                         if (!tmp->len)
 407                                 break;
 408
 409                         if (pos + tmp->len > actual_len) {
 410                                 dev_err(dev->udev->dev.parent,
 411                                         "Format error\n");
 412                                 break;
 413                         }
 414
 415                         if (tmp->id == id) {
 416                                 memcpy(msg, tmp, tmp->len);
 417                                 goto end;
 418                         }
 419
 420                         pos += tmp->len;
 421                 }
 422         } while (time_before(jiffies, to));
 423
 424         err = -EINVAL;
 425
 426 end:
 427         kfree(buf);
 428
 429         return err;
 430 }
 431
 432 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
 433                                       u8 msg_id, int channel)
 434 {
 435         struct kvaser_msg *msg;
 436         int rc;
 437
 438         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 439         if (!msg)
 440                 return -ENOMEM;
 441
 442         msg->id = msg_id;
 443         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 444         msg->u.simple.channel = channel;
 445         msg->u.simple.tid = 0xff;
 446
 447         rc = kvaser_usb_send_msg(dev, msg);
 448
 449         kfree(msg);
 450         return rc;
 451 }
 452
 453 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
 454 {
 455         struct kvaser_msg msg;
 456         int err;
 457
 458         err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
 459         if (err)
 460                 return err;
 461
 462         err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
 463         if (err)
 464                 return err;
 465
 466         dev->fw_version = le32_to_cpu(msg.u.softinfo.fw_version);
 467
 468         return 0;
 469 }
 470
 471 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
 472 {
 473         struct kvaser_msg msg;
 474         int err;
 475
 476         err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
 477         if (err)
 478                 return err;
 479
 480         err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
 481         if (err)
 482                 return err;
 483
 484         dev->nchannels = msg.u.cardinfo.nchannels;
 485         if (dev->nchannels > MAX_NET_DEVICES)
 486                 return -EINVAL;
 487
 488         return 0;
 489 }
 490
 491 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
 492                                       const struct kvaser_msg *msg)
 493 {
 494         struct net_device_stats *stats;
 495         struct kvaser_usb_tx_urb_context *context;
 496         struct kvaser_usb_net_priv *priv;
 497         struct sk_buff *skb;
 498         struct can_frame *cf;
 499         u8 channel = msg->u.tx_acknowledge.channel;
 500         u8 tid = msg->u.tx_acknowledge.tid;
 501
 502         if (channel >= dev->nchannels) {
 503                 dev_err(dev->udev->dev.parent,
 504                         "Invalid channel number (%d)\n", channel);
 505                 return;
 506         }
 507
 508         priv = dev->nets[channel];
 509
 510         if (!netif_device_present(priv->netdev))
 511                 return;
 512
 513         stats = &priv->netdev->stats;
 514
 515         context = &priv->tx_contexts[tid % MAX_TX_URBS];
 516
 517         /* Sometimes the state change doesn't come after a bus-off event */
 518         if (priv->can.restart_ms &&
 519             (priv->can.state >= CAN_STATE_BUS_OFF)) {
 520                 skb = alloc_can_err_skb(priv->netdev, &cf);
 521                 if (skb) {
 522                         cf->can_id |= CAN_ERR_RESTARTED;
 523
 524                         stats->rx_packets++;
 525                         stats->rx_bytes += cf->can_dlc;
 526                         netif_rx(skb);
 527                 } else {
 528                         netdev_err(priv->netdev,
 529                                    "No memory left for err_skb\n");
 530                 }
 531
 532                 priv->can.can_stats.restarts++;
 533                 netif_carrier_on(priv->netdev);
 534
 535                 priv->can.state = CAN_STATE_ERROR_ACTIVE;
 536         }
 537
 538         stats->tx_packets++;
 539         stats->tx_bytes += context->dlc;
 540         can_get_echo_skb(priv->netdev, context->echo_index);
 541
 542         context->echo_index = MAX_TX_URBS;
 543         atomic_dec(&priv->active_tx_urbs);
 544
 545         netif_wake_queue(priv->netdev);
 546 }
 547
 548 static void kvaser_usb_simple_msg_callback(struct urb *urb)
 549 {
 550         struct net_device *netdev = urb->context;
 551
 552         kfree(urb->transfer_buffer);
 553
 554         if (urb->status)
 555                 netdev_warn(netdev, "urb status received: %d\n",
 556                             urb->status);
 557 }
 558
 559 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
 560                                        u8 msg_id)
 561 {
 562         struct kvaser_usb *dev = priv->dev;
 563         struct net_device *netdev = priv->netdev;
 564         struct kvaser_msg *msg;
 565         struct urb *urb;
 566         void *buf;
 567         int err;
 568
 569         urb = usb_alloc_urb(0, GFP_ATOMIC);
 570         if (!urb) {
 571                 netdev_err(netdev, "No memory left for URBs\n");
 572                 return -ENOMEM;
 573         }
 574
 575         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
 576         if (!buf) {
 577                 usb_free_urb(urb);
 578                 return -ENOMEM;
 579         }
 580
 581         msg = (struct kvaser_msg *)buf;
 582         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 583         msg->id = msg_id;
 584         msg->u.simple.channel = priv->channel;
 585
 586         usb_fill_bulk_urb(urb, dev->udev,
 587                           usb_sndbulkpipe(dev->udev,
 588                                           dev->bulk_out->bEndpointAddress),
 589                           buf, msg->len,
 590                           kvaser_usb_simple_msg_callback, netdev);
 591         usb_anchor_urb(urb, &priv->tx_submitted);
 592
 593         err = usb_submit_urb(urb, GFP_ATOMIC);
 594         if (err) {
 595                 netdev_err(netdev, "Error transmitting URB\n");
 596                 usb_unanchor_urb(urb);
 597                 usb_free_urb(urb);
 598                 kfree(buf);
 599                 return err;
 600         }
 601
 602         usb_free_urb(urb);
 603
 604         return 0;
 605 }
 606
 607 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
 608 {
 609         int i;
 610
 611         usb_kill_anchored_urbs(&priv->tx_submitted);
 612         atomic_set(&priv->active_tx_urbs, 0);
 613
 614         for (i = 0; i < MAX_TX_URBS; i++)
 615                 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
 616 }
 617
 618 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
 619                                 const struct kvaser_msg *msg)
 620 {
 621         struct can_frame *cf;
 622         struct sk_buff *skb;
 623         struct net_device_stats *stats;
 624         struct kvaser_usb_net_priv *priv;
 625         unsigned int new_state;
 626         u8 channel, status, txerr, rxerr, error_factor;
 627
 628         switch (msg->id) {
 629         case CMD_CAN_ERROR_EVENT:
 630                 channel = msg->u.error_event.channel;
 631                 status =  msg->u.error_event.status;
 632                 txerr = msg->u.error_event.tx_errors_count;
 633                 rxerr = msg->u.error_event.rx_errors_count;
 634                 error_factor = msg->u.error_event.error_factor;
 635                 break;
 636         case CMD_LOG_MESSAGE:
 637                 channel = msg->u.log_message.channel;
 638                 status = msg->u.log_message.data[0];
 639                 txerr = msg->u.log_message.data[2];
 640                 rxerr = msg->u.log_message.data[3];
 641                 error_factor = msg->u.log_message.data[1];
 642                 break;
 643         case CMD_CHIP_STATE_EVENT:
 644                 channel = msg->u.chip_state_event.channel;
 645                 status =  msg->u.chip_state_event.status;
 646                 txerr = msg->u.chip_state_event.tx_errors_count;
 647                 rxerr = msg->u.chip_state_event.rx_errors_count;
 648                 error_factor = 0;
 649                 break;
 650         default:
 651                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
 652                         msg->id);
 653                 return;
 654         }
 655
 656         if (channel >= dev->nchannels) {
 657                 dev_err(dev->udev->dev.parent,
 658                         "Invalid channel number (%d)\n", channel);
 659                 return;
 660         }
 661
 662         priv = dev->nets[channel];
 663         stats = &priv->netdev->stats;
 664
 665         skb = alloc_can_err_skb(priv->netdev, &cf);
 666         if (!skb) {
 667                 stats->rx_dropped++;
 668                 return;
 669         }
 670
 671         new_state = priv->can.state;
 672
 673         netdev_dbg(priv->netdev, "Error status: 0x%02x\n", status);
 674
 675         if (status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
 676                 cf->can_id |= CAN_ERR_BUSOFF;
 677
 678                 priv->can.can_stats.bus_off++;
 679                 if (!priv->can.restart_ms)
 680                         kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
 681
 682                 netif_carrier_off(priv->netdev);
 683
 684                 new_state = CAN_STATE_BUS_OFF;
 685         } else if (status & M16C_STATE_BUS_PASSIVE) {
 686                 if (priv->can.state != CAN_STATE_ERROR_PASSIVE) {
 687                         cf->can_id |= CAN_ERR_CRTL;
 688
 689                         if (txerr || rxerr)
 690                                 cf->data[1] = (txerr > rxerr)
 691                                                 ? CAN_ERR_CRTL_TX_PASSIVE
 692                                                 : CAN_ERR_CRTL_RX_PASSIVE;
 693                         else
 694                                 cf->data[1] = CAN_ERR_CRTL_TX_PASSIVE |
 695                                               CAN_ERR_CRTL_RX_PASSIVE;
 696
 697                         priv->can.can_stats.error_passive++;
 698                 }
 699
 700                 new_state = CAN_STATE_ERROR_PASSIVE;
 701         } else if (status & M16C_STATE_BUS_ERROR) {
 702                 if ((priv->can.state < CAN_STATE_ERROR_WARNING) &&
 703                     ((txerr >= 96) || (rxerr >= 96))) {
 704                         cf->can_id |= CAN_ERR_CRTL;
 705                         cf->data[1] = (txerr > rxerr)
 706                                         ? CAN_ERR_CRTL_TX_WARNING
 707                                         : CAN_ERR_CRTL_RX_WARNING;
 708
 709                         priv->can.can_stats.error_warning++;
 710                         new_state = CAN_STATE_ERROR_WARNING;
 711                 } else if ((priv->can.state > CAN_STATE_ERROR_ACTIVE) &&
 712                            ((txerr < 96) && (rxerr < 96))) {
 713                         cf->can_id |= CAN_ERR_PROT;
 714                         cf->data[2] = CAN_ERR_PROT_ACTIVE;
 715
 716                         new_state = CAN_STATE_ERROR_ACTIVE;
 717                 }
 718         }
 719
 720         if (!status) {
 721                 cf->can_id |= CAN_ERR_PROT;
 722                 cf->data[2] = CAN_ERR_PROT_ACTIVE;
 723
 724                 new_state = CAN_STATE_ERROR_ACTIVE;
 725         }
 726
 727         if (priv->can.restart_ms &&
 728             (priv->can.state >= CAN_STATE_BUS_OFF) &&
 729             (new_state < CAN_STATE_BUS_OFF)) {
 730                 cf->can_id |= CAN_ERR_RESTARTED;
 731                 netif_carrier_on(priv->netdev);
 732
 733                 priv->can.can_stats.restarts++;
 734         }
 735
 736         if (error_factor) {
 737                 priv->can.can_stats.bus_error++;
 738                 stats->rx_errors++;
 739
 740                 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
 741
 742                 if (error_factor & M16C_EF_ACKE)
 743                         cf->data[3] |= (CAN_ERR_PROT_LOC_ACK);
 744                 if (error_factor & M16C_EF_CRCE)
 745                         cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
 746                                         CAN_ERR_PROT_LOC_CRC_DEL);
 747                 if (error_factor & M16C_EF_FORME)
 748                         cf->data[2] |= CAN_ERR_PROT_FORM;
 749                 if (error_factor & M16C_EF_STFE)
 750                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 751                 if (error_factor & M16C_EF_BITE0)
 752                         cf->data[2] |= CAN_ERR_PROT_BIT0;
 753                 if (error_factor & M16C_EF_BITE1)
 754                         cf->data[2] |= CAN_ERR_PROT_BIT1;
 755                 if (error_factor & M16C_EF_TRE)
 756                         cf->data[2] |= CAN_ERR_PROT_TX;
 757         }
 758
 759         cf->data[6] = txerr;
 760         cf->data[7] = rxerr;
 761
 762         priv->bec.txerr = txerr;
 763         priv->bec.rxerr = rxerr;
 764
 765         priv->can.state = new_state;
 766
 767         stats->rx_packets++;
 768         stats->rx_bytes += cf->can_dlc;
 769         netif_rx(skb);
 770 }
 771
 772 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
 773                                   const struct kvaser_msg *msg)
 774 {
 775         struct can_frame *cf;
 776         struct sk_buff *skb;
 777         struct net_device_stats *stats = &priv->netdev->stats;
 778
 779         if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
 780                                          MSG_FLAG_NERR)) {
 781                 netdev_err(priv->netdev, "Unknow error (flags: 0x%02x)\n",
 782                            msg->u.rx_can.flag);
 783
 784                 stats->rx_errors++;
 785                 return;
 786         }
 787
 788         if (msg->u.rx_can.flag & MSG_FLAG_OVERRUN) {
 789                 skb = alloc_can_err_skb(priv->netdev, &cf);
 790                 if (!skb) {
 791                         stats->rx_dropped++;
 792                         return;
 793                 }
 794
 795                 cf->can_id |= CAN_ERR_CRTL;
 796                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 797
 798                 stats->rx_over_errors++;
 799                 stats->rx_errors++;
 800
 801                 stats->rx_packets++;
 802                 stats->rx_bytes += cf->can_dlc;
 803                 netif_rx(skb);
 804         }
 805 }
 806
 807 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
 808                                   const struct kvaser_msg *msg)
 809 {
 810         struct kvaser_usb_net_priv *priv;
 811         struct can_frame *cf;
 812         struct sk_buff *skb;
 813         struct net_device_stats *stats;
 814         u8 channel = msg->u.rx_can.channel;
 815
 816         if (channel >= dev->nchannels) {
 817                 dev_err(dev->udev->dev.parent,
 818                         "Invalid channel number (%d)\n", channel);
 819                 return;
 820         }
 821
 822         priv = dev->nets[channel];
 823         stats = &priv->netdev->stats;
 824
 825         if ((msg->u.rx_can.flag & MSG_FLAG_ERROR_FRAME) &&
 826             (msg->id == CMD_LOG_MESSAGE)) {
 827                 kvaser_usb_rx_error(dev, msg);
 828                 return;
 829         } else if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
 830                                          MSG_FLAG_NERR |
 831                                          MSG_FLAG_OVERRUN)) {
 832                 kvaser_usb_rx_can_err(priv, msg);
 833                 return;
 834         } else if (msg->u.rx_can.flag & ~MSG_FLAG_REMOTE_FRAME) {
 835                 netdev_warn(priv->netdev,
 836                             "Unhandled frame (flags: 0x%02x)",
 837                             msg->u.rx_can.flag);
 838                 return;
 839         }
 840
 841         skb = alloc_can_skb(priv->netdev, &cf);
 842         if (!skb) {
 843                 stats->tx_dropped++;
 844                 return;
 845         }
 846
 847         if (msg->id == CMD_LOG_MESSAGE) {
 848                 cf->can_id = le32_to_cpu(msg->u.log_message.id);
 849                 if (cf->can_id & KVASER_EXTENDED_FRAME)
 850                         cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
 851                 else
 852                         cf->can_id &= CAN_SFF_MASK;
 853
 854                 cf->can_dlc = get_can_dlc(msg->u.log_message.dlc);
 855
 856                 if (msg->u.log_message.flags & MSG_FLAG_REMOTE_FRAME)
 857                         cf->can_id |= CAN_RTR_FLAG;
 858                 else
 859                         memcpy(cf->data, &msg->u.log_message.data,
 860                                cf->can_dlc);
 861         } else {
 862                 cf->can_id = ((msg->u.rx_can.msg[0] & 0x1f) << 6) |
 863                              (msg->u.rx_can.msg[1] & 0x3f);
 864
 865                 if (msg->id == CMD_RX_EXT_MESSAGE) {
 866                         cf->can_id <<= 18;
 867                         cf->can_id |= ((msg->u.rx_can.msg[2] & 0x0f) << 14) |
 868                                       ((msg->u.rx_can.msg[3] & 0xff) << 6) |
 869                                       (msg->u.rx_can.msg[4] & 0x3f);
 870                         cf->can_id |= CAN_EFF_FLAG;
 871                 }
 872
 873                 cf->can_dlc = get_can_dlc(msg->u.rx_can.msg[5]);
 874
 875                 if (msg->u.rx_can.flag & MSG_FLAG_REMOTE_FRAME)
 876                         cf->can_id |= CAN_RTR_FLAG;
 877                 else
 878                         memcpy(cf->data, &msg->u.rx_can.msg[6],
 879                                cf->can_dlc);
 880         }
 881
 882         stats->rx_packets++;
 883         stats->rx_bytes += cf->can_dlc;
 884         netif_rx(skb);
 885 }
 886
 887 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
 888                                         const struct kvaser_msg *msg)
 889 {
 890         struct kvaser_usb_net_priv *priv;
 891         u8 channel = msg->u.simple.channel;
 892
 893         if (channel >= dev->nchannels) {
 894                 dev_err(dev->udev->dev.parent,
 895                         "Invalid channel number (%d)\n", channel);
 896                 return;
 897         }
 898
 899         priv = dev->nets[channel];
 900
 901         if (completion_done(&priv->start_comp) &&
 902             netif_queue_stopped(priv->netdev)) {
 903                 netif_wake_queue(priv->netdev);
 904         } else {
 905                 netif_start_queue(priv->netdev);
 906                 complete(&priv->start_comp);
 907         }
 908 }
 909
 910 static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
 911                                        const struct kvaser_msg *msg)
 912 {
 913         struct kvaser_usb_net_priv *priv;
 914         u8 channel = msg->u.simple.channel;
 915
 916         if (channel >= dev->nchannels) {
 917                 dev_err(dev->udev->dev.parent,
 918                         "Invalid channel number (%d)\n", channel);
 919                 return;
 920         }
 921
 922         priv = dev->nets[channel];
 923
 924         complete(&priv->stop_comp);
 925 }
 926
 927 static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
 928                                       const struct kvaser_msg *msg)
 929 {
 930         switch (msg->id) {
 931         case CMD_START_CHIP_REPLY:
 932                 kvaser_usb_start_chip_reply(dev, msg);
 933                 break;
 934
 935         case CMD_STOP_CHIP_REPLY:
 936                 kvaser_usb_stop_chip_reply(dev, msg);
 937                 break;
 938
 939         case CMD_RX_STD_MESSAGE:
 940         case CMD_RX_EXT_MESSAGE:
 941         case CMD_LOG_MESSAGE:
 942                 kvaser_usb_rx_can_msg(dev, msg);
 943                 break;
 944
 945         case CMD_CHIP_STATE_EVENT:
 946         case CMD_CAN_ERROR_EVENT:
 947                 kvaser_usb_rx_error(dev, msg);
 948                 break;
 949
 950         case CMD_TX_ACKNOWLEDGE:
 951                 kvaser_usb_tx_acknowledge(dev, msg);
 952                 break;
 953
 954         default:
 955                 dev_warn(dev->udev->dev.parent,
 956                          "Unhandled message (%d)\n", msg->id);
 957                 break;
 958         }
 959 }
 960
 961 static void kvaser_usb_read_bulk_callback(struct urb *urb)
 962 {
 963         struct kvaser_usb *dev = urb->context;
 964         struct kvaser_msg *msg;
 965         int pos = 0;
 966         int err, i;
 967
 968         switch (urb->status) {
 969         case 0:
 970                 break;
 971         case -ENOENT:
 972         case -ESHUTDOWN:
 973                 return;
 974         default:
 975                 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
 976                          urb->status);
 977                 goto resubmit_urb;
 978         }
 979
 980         while (pos <= urb->actual_length - MSG_HEADER_LEN) {
 981                 msg = urb->transfer_buffer + pos;
 982
 983                 if (!msg->len)
 984                         break;
 985
 986                 if (pos + msg->len > urb->actual_length) {
 987                         dev_err(dev->udev->dev.parent, "Format error\n");
 988                         break;
 989                 }
 990
 991                 kvaser_usb_handle_message(dev, msg);
 992
 993                 pos += msg->len;
 994         }
 995
 996 resubmit_urb:
 997         usb_fill_bulk_urb(urb, dev->udev,
 998                           usb_rcvbulkpipe(dev->udev,
 999                                           dev->bulk_in->bEndpointAddress),
1000                           urb->transfer_buffer, RX_BUFFER_SIZE,
1001                           kvaser_usb_read_bulk_callback, dev);
1002
1003         err = usb_submit_urb(urb, GFP_ATOMIC);
1004         if (err == -ENODEV) {
1005                 for (i = 0; i < dev->nchannels; i++) {
1006                         if (!dev->nets[i])
1007                                 continue;
1008
1009                         netif_device_detach(dev->nets[i]->netdev);
1010                 }
1011         } else if (err) {
1012                 dev_err(dev->udev->dev.parent,
1013                         "Failed resubmitting read bulk urb: %d\n", err);
1014         }
1015
1016         return;
1017 }
1018
1019 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1020 {
1021         int i, err = 0;
1022
1023         if (dev->rxinitdone)
1024                 return 0;
1025
1026         for (i = 0; i < MAX_RX_URBS; i++) {
1027                 struct urb *urb = NULL;
1028                 u8 *buf = NULL;
1029                 dma_addr_t buf_dma;
1030
1031                 urb = usb_alloc_urb(0, GFP_KERNEL);
1032                 if (!urb) {
1033                         dev_warn(dev->udev->dev.parent,
1034                                  "No memory left for URBs\n");
1035                         err = -ENOMEM;
1036                         break;
1037                 }
1038
1039                 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1040                                          GFP_KERNEL, &buf_dma);
1041                 if (!buf) {
1042                         dev_warn(dev->udev->dev.parent,
1043                                  "No memory left for USB buffer\n");
1044                         usb_free_urb(urb);
1045                         err = -ENOMEM;
1046                         break;
1047                 }
1048
1049                 usb_fill_bulk_urb(urb, dev->udev,
1050                                   usb_rcvbulkpipe(dev->udev,
1051                                           dev->bulk_in->bEndpointAddress),
1052                                   buf, RX_BUFFER_SIZE,
1053                                   kvaser_usb_read_bulk_callback,
1054                                   dev);
1055                 urb->transfer_dma = buf_dma;
1056                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1057                 usb_anchor_urb(urb, &dev->rx_submitted);
1058
1059                 err = usb_submit_urb(urb, GFP_KERNEL);
1060                 if (err) {
1061                         usb_unanchor_urb(urb);
1062                         usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1063                                           buf_dma);
1064                         usb_free_urb(urb);
1065                         break;
1066                 }
1067
1068                 dev->rxbuf[i] = buf;
1069                 dev->rxbuf_dma[i] = buf_dma;
1070
1071                 usb_free_urb(urb);
1072         }
1073
1074         if (i == 0) {
1075                 dev_warn(dev->udev->dev.parent,
1076                          "Cannot setup read URBs, error %d\n", err);
1077                 return err;
1078         } else if (i < MAX_RX_URBS) {
1079                 dev_warn(dev->udev->dev.parent,
1080                          "RX performances may be slow\n");
1081         }
1082
1083         dev->rxinitdone = true;
1084
1085         return 0;
1086 }
1087
1088 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1089 {
1090         struct kvaser_msg *msg;
1091         int rc;
1092
1093         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1094         if (!msg)
1095                 return -ENOMEM;
1096
1097         msg->id = CMD_SET_CTRL_MODE;
1098         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1099         msg->u.ctrl_mode.tid = 0xff;
1100         msg->u.ctrl_mode.channel = priv->channel;
1101
1102         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1103                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1104         else
1105                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1106
1107         rc = kvaser_usb_send_msg(priv->dev, msg);
1108
1109         kfree(msg);
1110         return rc;
1111 }
1112
1113 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1114 {
1115         int err;
1116
1117         init_completion(&priv->start_comp);
1118
1119         err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1120                                          priv->channel);
1121         if (err)
1122                 return err;
1123
1124         if (!wait_for_completion_timeout(&priv->start_comp,
1125                                          msecs_to_jiffies(START_TIMEOUT)))
1126                 return -ETIMEDOUT;
1127
1128         return 0;
1129 }
1130
1131 static int kvaser_usb_open(struct net_device *netdev)
1132 {
1133         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1134         struct kvaser_usb *dev = priv->dev;
1135         int err;
1136
1137         err = open_candev(netdev);
1138         if (err)
1139                 return err;
1140
1141         err = kvaser_usb_setup_rx_urbs(dev);
1142         if (err)
1143                 goto error;
1144
1145         err = kvaser_usb_set_opt_mode(priv);
1146         if (err)
1147                 goto error;
1148
1149         err = kvaser_usb_start_chip(priv);
1150         if (err) {
1151                 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1152                 goto error;
1153         }
1154
1155         priv->can.state = CAN_STATE_ERROR_ACTIVE;
1156
1157         return 0;
1158
1159 error:
1160         close_candev(netdev);
1161         return err;
1162 }
1163
1164 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1165 {
1166         int i;
1167
1168         usb_kill_anchored_urbs(&dev->rx_submitted);
1169
1170         for (i = 0; i < MAX_RX_URBS; i++)
1171                 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1172                                   dev->rxbuf[i],
1173                                   dev->rxbuf_dma[i]);
1174
1175         for (i = 0; i < MAX_NET_DEVICES; i++) {
1176                 struct kvaser_usb_net_priv *priv = dev->nets[i];
1177
1178                 if (priv)
1179                         kvaser_usb_unlink_tx_urbs(priv);
1180         }
1181 }
1182
1183 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1184 {
1185         int err;
1186
1187         init_completion(&priv->stop_comp);
1188
1189         err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1190                                          priv->channel);
1191         if (err)
1192                 return err;
1193
1194         if (!wait_for_completion_timeout(&priv->stop_comp,
1195                                          msecs_to_jiffies(STOP_TIMEOUT)))
1196                 return -ETIMEDOUT;
1197
1198         return 0;
1199 }
1200
1201 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1202 {
1203         struct kvaser_msg *msg;
1204         int rc;
1205
1206         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1207         if (!msg)
1208                 return -ENOMEM;
1209
1210         msg->id = CMD_FLUSH_QUEUE;
1211         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1212         msg->u.flush_queue.channel = priv->channel;
1213         msg->u.flush_queue.flags = 0x00;
1214
1215         rc = kvaser_usb_send_msg(priv->dev, msg);
1216
1217         kfree(msg);
1218         return rc;
1219 }
1220
1221 static int kvaser_usb_close(struct net_device *netdev)
1222 {
1223         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1224         struct kvaser_usb *dev = priv->dev;
1225         int err;
1226
1227         netif_stop_queue(netdev);
1228
1229         err = kvaser_usb_flush_queue(priv);
1230         if (err)
1231                 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1232
1233         if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel))
1234                 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1235
1236         err = kvaser_usb_stop_chip(priv);
1237         if (err)
1238                 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1239
1240         /* reset tx contexts */
1241         kvaser_usb_unlink_tx_urbs(priv);
1242
1243         priv->can.state = CAN_STATE_STOPPED;
1244         close_candev(priv->netdev);
1245
1246         return 0;
1247 }
1248
1249 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1250 {
1251         struct kvaser_usb_tx_urb_context *context = urb->context;
1252         struct kvaser_usb_net_priv *priv;
1253         struct net_device *netdev;
1254
1255         if (WARN_ON(!context))
1256                 return;
1257
1258         priv = context->priv;
1259         netdev = priv->netdev;
1260
1261         kfree(urb->transfer_buffer);
1262
1263         if (!netif_device_present(netdev))
1264                 return;
1265
1266         if (urb->status)
1267                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1268 }
1269
1270 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1271                                          struct net_device *netdev)
1272 {
1273         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1274         struct kvaser_usb *dev = priv->dev;
1275         struct net_device_stats *stats = &netdev->stats;
1276         struct can_frame *cf = (struct can_frame *)skb->data;
1277         struct kvaser_usb_tx_urb_context *context = NULL;
1278         struct urb *urb;
1279         void *buf;
1280         struct kvaser_msg *msg;
1281         int i, err;
1282         int ret = NETDEV_TX_OK;
1283
1284         if (can_dropped_invalid_skb(netdev, skb))
1285                 return NETDEV_TX_OK;
1286
1287         urb = usb_alloc_urb(0, GFP_ATOMIC);
1288         if (!urb) {
1289                 netdev_err(netdev, "No memory left for URBs\n");
1290                 stats->tx_dropped++;
1291                 dev_kfree_skb(skb);
1292                 return NETDEV_TX_OK;
1293         }
1294
1295         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1296         if (!buf) {
1297                 stats->tx_dropped++;
1298                 dev_kfree_skb(skb);
1299                 goto nobufmem;
1300         }
1301
1302         msg = buf;
1303         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1304         msg->u.tx_can.flags = 0;
1305         msg->u.tx_can.channel = priv->channel;
1306
1307         if (cf->can_id & CAN_EFF_FLAG) {
1308                 msg->id = CMD_TX_EXT_MESSAGE;
1309                 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1310                 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1311                 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1312                 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1313                 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1314         } else {
1315                 msg->id = CMD_TX_STD_MESSAGE;
1316                 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1317                 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1318         }
1319
1320         msg->u.tx_can.msg[5] = cf->can_dlc;
1321         memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1322
1323         if (cf->can_id & CAN_RTR_FLAG)
1324                 msg->u.tx_can.flags |= MSG_FLAG_REMOTE_FRAME;
1325
1326         for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++) {
1327                 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
1328                         context = &priv->tx_contexts[i];
1329                         break;
1330                 }
1331         }
1332
1333         /* This should never happen; it implies a flow control bug */
1334         if (!context) {
1335                 netdev_warn(netdev, "cannot find free context\n");
1336                 ret =  NETDEV_TX_BUSY;
1337                 goto releasebuf;
1338         }
1339
1340         context->priv = priv;
1341         context->echo_index = i;
1342         context->dlc = cf->can_dlc;
1343
1344         msg->u.tx_can.tid = context->echo_index;
1345
1346         usb_fill_bulk_urb(urb, dev->udev,
1347                           usb_sndbulkpipe(dev->udev,
1348                                           dev->bulk_out->bEndpointAddress),
1349                           buf, msg->len,
1350                           kvaser_usb_write_bulk_callback, context);
1351         usb_anchor_urb(urb, &priv->tx_submitted);
1352
1353         can_put_echo_skb(skb, netdev, context->echo_index);
1354
1355         atomic_inc(&priv->active_tx_urbs);
1356
1357         if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
1358                 netif_stop_queue(netdev);
1359
1360         err = usb_submit_urb(urb, GFP_ATOMIC);
1361         if (unlikely(err)) {
1362                 can_free_echo_skb(netdev, context->echo_index);
1363
1364                 atomic_dec(&priv->active_tx_urbs);
1365                 usb_unanchor_urb(urb);
1366
1367                 stats->tx_dropped++;
1368
1369                 if (err == -ENODEV)
1370                         netif_device_detach(netdev);
1371                 else
1372                         netdev_warn(netdev, "Failed tx_urb %d\n", err);
1373
1374                 goto releasebuf;
1375         }
1376
1377         usb_free_urb(urb);
1378
1379         return NETDEV_TX_OK;
1380
1381 releasebuf:
1382         kfree(buf);
1383 nobufmem:
1384         usb_free_urb(urb);
1385         return ret;
1386 }
1387
1388 static const struct net_device_ops kvaser_usb_netdev_ops = {
1389         .ndo_open = kvaser_usb_open,
1390         .ndo_stop = kvaser_usb_close,
1391         .ndo_start_xmit = kvaser_usb_start_xmit,
1392         .ndo_change_mtu = can_change_mtu,
1393 };
1394
1395 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1396         .name = "kvaser_usb",
1397         .tseg1_min = KVASER_USB_TSEG1_MIN,
1398         .tseg1_max = KVASER_USB_TSEG1_MAX,
1399         .tseg2_min = KVASER_USB_TSEG2_MIN,
1400         .tseg2_max = KVASER_USB_TSEG2_MAX,
1401         .sjw_max = KVASER_USB_SJW_MAX,
1402         .brp_min = KVASER_USB_BRP_MIN,
1403         .brp_max = KVASER_USB_BRP_MAX,
1404         .brp_inc = KVASER_USB_BRP_INC,
1405 };
1406
1407 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1408 {
1409         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1410         struct can_bittiming *bt = &priv->can.bittiming;
1411         struct kvaser_usb *dev = priv->dev;
1412         struct kvaser_msg *msg;
1413         int rc;
1414
1415         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1416         if (!msg)
1417                 return -ENOMEM;
1418
1419         msg->id = CMD_SET_BUS_PARAMS;
1420         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1421         msg->u.busparams.channel = priv->channel;
1422         msg->u.busparams.tid = 0xff;
1423         msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1424         msg->u.busparams.sjw = bt->sjw;
1425         msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1426         msg->u.busparams.tseg2 = bt->phase_seg2;
1427
1428         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1429                 msg->u.busparams.no_samp = 3;
1430         else
1431                 msg->u.busparams.no_samp = 1;
1432
1433         rc = kvaser_usb_send_msg(dev, msg);
1434
1435         kfree(msg);
1436         return rc;
1437 }
1438
1439 static int kvaser_usb_set_mode(struct net_device *netdev,
1440                                enum can_mode mode)
1441 {
1442         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1443         int err;
1444
1445         switch (mode) {
1446         case CAN_MODE_START:
1447                 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1448                 if (err)
1449                         return err;
1450                 break;
1451         default:
1452                 return -EOPNOTSUPP;
1453         }
1454
1455         return 0;
1456 }
1457
1458 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1459                                        struct can_berr_counter *bec)
1460 {
1461         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1462
1463         *bec = priv->bec;
1464
1465         return 0;
1466 }
1467
1468 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1469 {
1470         int i;
1471
1472         for (i = 0; i < dev->nchannels; i++) {
1473                 if (!dev->nets[i])
1474                         continue;
1475
1476                 unregister_netdev(dev->nets[i]->netdev);
1477         }
1478
1479         kvaser_usb_unlink_all_urbs(dev);
1480
1481         for (i = 0; i < dev->nchannels; i++) {
1482                 if (!dev->nets[i])
1483                         continue;
1484
1485                 free_candev(dev->nets[i]->netdev);
1486         }
1487 }
1488
1489 static int kvaser_usb_init_one(struct usb_interface *intf,
1490                                const struct usb_device_id *id, int channel)
1491 {
1492         struct kvaser_usb *dev = usb_get_intfdata(intf);
1493         struct net_device *netdev;
1494         struct kvaser_usb_net_priv *priv;
1495         int i, err;
1496
1497         err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
1498         if (err)
1499                 return err;
1500
1501         netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
1502         if (!netdev) {
1503                 dev_err(&intf->dev, "Cannot alloc candev\n");
1504                 return -ENOMEM;
1505         }
1506
1507         priv = netdev_priv(netdev);
1508
1509         init_completion(&priv->start_comp);
1510         init_completion(&priv->stop_comp);
1511
1512         init_usb_anchor(&priv->tx_submitted);
1513         atomic_set(&priv->active_tx_urbs, 0);
1514
1515         for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++)
1516                 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
1517
1518         priv->dev = dev;
1519         priv->netdev = netdev;
1520         priv->channel = channel;
1521
1522         priv->can.state = CAN_STATE_STOPPED;
1523         priv->can.clock.freq = CAN_USB_CLOCK;
1524         priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1525         priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1526         priv->can.do_set_mode = kvaser_usb_set_mode;
1527         if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1528                 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1529         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1530         if (id->driver_info & KVASER_HAS_SILENT_MODE)
1531                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1532
1533         netdev->flags |= IFF_ECHO;
1534
1535         netdev->netdev_ops = &kvaser_usb_netdev_ops;
1536
1537         SET_NETDEV_DEV(netdev, &intf->dev);
1538         netdev->dev_id = channel;
1539
1540         dev->nets[channel] = priv;
1541
1542         err = register_candev(netdev);
1543         if (err) {
1544                 dev_err(&intf->dev, "Failed to register can device\n");
1545                 free_candev(netdev);
1546                 dev->nets[channel] = NULL;
1547                 return err;
1548         }
1549
1550         netdev_dbg(netdev, "device registered\n");
1551
1552         return 0;
1553 }
1554
1555 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1556                                     struct usb_endpoint_descriptor **in,
1557                                     struct usb_endpoint_descriptor **out)
1558 {
1559         const struct usb_host_interface *iface_desc;
1560         struct usb_endpoint_descriptor *endpoint;
1561         int i;
1562
1563         iface_desc = &intf->altsetting[0];
1564
1565         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1566                 endpoint = &iface_desc->endpoint[i].desc;
1567
1568                 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1569                         *in = endpoint;
1570
1571                 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1572                         *out = endpoint;
1573
1574                 /* use first bulk endpoint for in and out */
1575                 if (*in && *out)
1576                         return 0;
1577         }
1578
1579         return -ENODEV;
1580 }
1581
1582 static int kvaser_usb_probe(struct usb_interface *intf,
1583                             const struct usb_device_id *id)
1584 {
1585         struct kvaser_usb *dev;
1586         int err = -ENOMEM;
1587         int i, retry = 3;
1588
1589         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1590         if (!dev)
1591                 return -ENOMEM;
1592
1593         err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
1594         if (err) {
1595                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
1596                 return err;
1597         }
1598
1599         dev->udev = interface_to_usbdev(intf);
1600
1601         init_usb_anchor(&dev->rx_submitted);
1602
1603         usb_set_intfdata(intf, dev);
1604
1605         /* On some x86 laptops, plugging a Kvaser device again after
1606          * an unplug makes the firmware always ignore the very first
1607          * command. For such a case, provide some room for retries
1608          * instead of completely exiting the driver.
1609          */
1610         do {
1611                 err = kvaser_usb_get_software_info(dev);
1612         } while (--retry && err == -ETIMEDOUT);
1613
1614         if (err) {
1615                 dev_err(&intf->dev,
1616                         "Cannot get software infos, error %d\n", err);
1617                 return err;
1618         }
1619
1620         err = kvaser_usb_get_card_info(dev);
1621         if (err) {
1622                 dev_err(&intf->dev,
1623                         "Cannot get card infos, error %d\n", err);
1624                 return err;
1625         }
1626
1627         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
1628                 ((dev->fw_version >> 24) & 0xff),
1629                 ((dev->fw_version >> 16) & 0xff),
1630                 (dev->fw_version & 0xffff));
1631
1632         for (i = 0; i < dev->nchannels; i++) {
1633                 err = kvaser_usb_init_one(intf, id, i);
1634                 if (err) {
1635                         kvaser_usb_remove_interfaces(dev);
1636                         return err;
1637                 }
1638         }
1639
1640         return 0;
1641 }
1642
1643 static void kvaser_usb_disconnect(struct usb_interface *intf)
1644 {
1645         struct kvaser_usb *dev = usb_get_intfdata(intf);
1646
1647         usb_set_intfdata(intf, NULL);
1648
1649         if (!dev)
1650                 return;
1651
1652         kvaser_usb_remove_interfaces(dev);
1653 }
1654
1655 static struct usb_driver kvaser_usb_driver = {
1656         .name = "kvaser_usb",
1657         .probe = kvaser_usb_probe,
1658         .disconnect = kvaser_usb_disconnect,
1659         .id_table = kvaser_usb_table,
1660 };
1661
1662 module_usb_driver(kvaser_usb_driver);
1663
1664 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
1665 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
1666 MODULE_LICENSE("GPL v2");