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