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
  57 /* USB devices features */
  58 #define KVASER_HAS_SILENT_MODE          BIT(0)
  59 #define KVASER_HAS_TXRX_ERRORS          BIT(1)
  60
  61 /* Message header size */
  62 #define MSG_HEADER_LEN                  2
  63
  64 /* Can message flags */
  65 #define MSG_FLAG_ERROR_FRAME            BIT(0)
  66 #define MSG_FLAG_OVERRUN                BIT(1)
  67 #define MSG_FLAG_NERR                   BIT(2)
  68 #define MSG_FLAG_WAKEUP                 BIT(3)
  69 #define MSG_FLAG_REMOTE_FRAME           BIT(4)
  70 #define MSG_FLAG_RESERVED               BIT(5)
  71 #define MSG_FLAG_TX_ACK                 BIT(6)
  72 #define MSG_FLAG_TX_REQUEST             BIT(7)
  73
  74 /* Can states */
  75 #define M16C_STATE_BUS_RESET            BIT(0)
  76 #define M16C_STATE_BUS_ERROR            BIT(4)
  77 #define M16C_STATE_BUS_PASSIVE          BIT(5)
  78 #define M16C_STATE_BUS_OFF              BIT(6)
  79
  80 /* Can msg ids */
  81 #define CMD_RX_STD_MESSAGE              12
  82 #define CMD_TX_STD_MESSAGE              13
  83 #define CMD_RX_EXT_MESSAGE              14
  84 #define CMD_TX_EXT_MESSAGE              15
  85 #define CMD_SET_BUS_PARAMS              16
  86 #define CMD_GET_BUS_PARAMS              17
  87 #define CMD_GET_BUS_PARAMS_REPLY        18
  88 #define CMD_GET_CHIP_STATE              19
  89 #define CMD_CHIP_STATE_EVENT            20
  90 #define CMD_SET_CTRL_MODE               21
  91 #define CMD_GET_CTRL_MODE               22
  92 #define CMD_GET_CTRL_MODE_REPLY         23
  93 #define CMD_RESET_CHIP                  24
  94 #define CMD_RESET_CARD                  25
  95 #define CMD_START_CHIP                  26
  96 #define CMD_START_CHIP_REPLY            27
  97 #define CMD_STOP_CHIP                   28
  98 #define CMD_STOP_CHIP_REPLY             29
  99 #define CMD_GET_CARD_INFO2              32
 100 #define CMD_GET_CARD_INFO               34
 101 #define CMD_GET_CARD_INFO_REPLY         35
 102 #define CMD_GET_SOFTWARE_INFO           38
 103 #define CMD_GET_SOFTWARE_INFO_REPLY     39
 104 #define CMD_ERROR_EVENT                 45
 105 #define CMD_FLUSH_QUEUE                 48
 106 #define CMD_RESET_ERROR_COUNTER         49
 107 #define CMD_TX_ACKNOWLEDGE              50
 108 #define CMD_CAN_ERROR_EVENT             51
 109 #define CMD_USB_THROTTLE                77
 110 #define CMD_LOG_MESSAGE                 106
 111
 112 /* error factors */
 113 #define M16C_EF_ACKE                    BIT(0)
 114 #define M16C_EF_CRCE                    BIT(1)
 115 #define M16C_EF_FORME                   BIT(2)
 116 #define M16C_EF_STFE                    BIT(3)
 117 #define M16C_EF_BITE0                   BIT(4)
 118 #define M16C_EF_BITE1                   BIT(5)
 119 #define M16C_EF_RCVE                    BIT(6)
 120 #define M16C_EF_TRE                     BIT(7)
 121
 122 /* bittiming parameters */
 123 #define KVASER_USB_TSEG1_MIN            1
 124 #define KVASER_USB_TSEG1_MAX            16
 125 #define KVASER_USB_TSEG2_MIN            1
 126 #define KVASER_USB_TSEG2_MAX            8
 127 #define KVASER_USB_SJW_MAX              4
 128 #define KVASER_USB_BRP_MIN              1
 129 #define KVASER_USB_BRP_MAX              64
 130 #define KVASER_USB_BRP_INC              1
 131
 132 /* ctrl modes */
 133 #define KVASER_CTRL_MODE_NORMAL         1
 134 #define KVASER_CTRL_MODE_SILENT         2
 135 #define KVASER_CTRL_MODE_SELFRECEPTION  3
 136 #define KVASER_CTRL_MODE_OFF            4
 137
 138 /* log message */
 139 #define KVASER_EXTENDED_FRAME           BIT(31)
 140
 141 struct kvaser_msg_simple {
 142         u8 tid;
 143         u8 channel;
 144 } __packed;
 145
 146 struct kvaser_msg_cardinfo {
 147         u8 tid;
 148         u8 nchannels;
 149         __le32 serial_number;
 150         __le32 padding;
 151         __le32 clock_resolution;
 152         __le32 mfgdate;
 153         u8 ean[8];
 154         u8 hw_revision;
 155         u8 usb_hs_mode;
 156         __le16 padding2;
 157 } __packed;
 158
 159 struct kvaser_msg_cardinfo2 {
 160         u8 tid;
 161         u8 channel;
 162         u8 pcb_id[24];
 163         __le32 oem_unlock_code;
 164 } __packed;
 165
 166 struct kvaser_msg_softinfo {
 167         u8 tid;
 168         u8 channel;
 169         __le32 sw_options;
 170         __le32 fw_version;
 171         __le16 max_outstanding_tx;
 172         __le16 padding[9];
 173 } __packed;
 174
 175 struct kvaser_msg_busparams {
 176         u8 tid;
 177         u8 channel;
 178         __le32 bitrate;
 179         u8 tseg1;
 180         u8 tseg2;
 181         u8 sjw;
 182         u8 no_samp;
 183 } __packed;
 184
 185 struct kvaser_msg_tx_can {
 186         u8 channel;
 187         u8 tid;
 188         u8 msg[14];
 189         u8 padding;
 190         u8 flags;
 191 } __packed;
 192
 193 struct kvaser_msg_rx_can {
 194         u8 channel;
 195         u8 flag;
 196         __le16 time[3];
 197         u8 msg[14];
 198 } __packed;
 199
 200 struct kvaser_msg_chip_state_event {
 201         u8 tid;
 202         u8 channel;
 203         __le16 time[3];
 204         u8 tx_errors_count;
 205         u8 rx_errors_count;
 206         u8 status;
 207         u8 padding[3];
 208 } __packed;
 209
 210 struct kvaser_msg_tx_acknowledge {
 211         u8 channel;
 212         u8 tid;
 213         __le16 time[3];
 214         u8 flags;
 215         u8 time_offset;
 216 } __packed;
 217
 218 struct kvaser_msg_error_event {
 219         u8 tid;
 220         u8 flags;
 221         __le16 time[3];
 222         u8 channel;
 223         u8 padding;
 224         u8 tx_errors_count;
 225         u8 rx_errors_count;
 226         u8 status;
 227         u8 error_factor;
 228 } __packed;
 229
 230 struct kvaser_msg_ctrl_mode {
 231         u8 tid;
 232         u8 channel;
 233         u8 ctrl_mode;
 234         u8 padding[3];
 235 } __packed;
 236
 237 struct kvaser_msg_flush_queue {
 238         u8 tid;
 239         u8 channel;
 240         u8 flags;
 241         u8 padding[3];
 242 } __packed;
 243
 244 struct kvaser_msg_log_message {
 245         u8 channel;
 246         u8 flags;
 247         __le16 time[3];
 248         u8 dlc;
 249         u8 time_offset;
 250         __le32 id;
 251         u8 data[8];
 252 } __packed;
 253
 254 struct kvaser_msg {
 255         u8 len;
 256         u8 id;
 257         union   {
 258                 struct kvaser_msg_simple simple;
 259                 struct kvaser_msg_cardinfo cardinfo;
 260                 struct kvaser_msg_cardinfo2 cardinfo2;
 261                 struct kvaser_msg_softinfo softinfo;
 262                 struct kvaser_msg_busparams busparams;
 263                 struct kvaser_msg_tx_can tx_can;
 264                 struct kvaser_msg_rx_can rx_can;
 265                 struct kvaser_msg_chip_state_event chip_state_event;
 266                 struct kvaser_msg_tx_acknowledge tx_acknowledge;
 267                 struct kvaser_msg_error_event error_event;
 268                 struct kvaser_msg_ctrl_mode ctrl_mode;
 269                 struct kvaser_msg_flush_queue flush_queue;
 270                 struct kvaser_msg_log_message log_message;
 271         } u;
 272 } __packed;
 273
 274 struct kvaser_usb_tx_urb_context {
 275         struct kvaser_usb_net_priv *priv;
 276         u32 echo_index;
 277         int dlc;
 278 };
 279
 280 struct kvaser_usb {
 281         struct usb_device *udev;
 282         struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
 283
 284         struct usb_endpoint_descriptor *bulk_in, *bulk_out;
 285         struct usb_anchor rx_submitted;
 286
 287         u32 fw_version;
 288         unsigned int nchannels;
 289
 290         bool rxinitdone;
 291         void *rxbuf[MAX_RX_URBS];
 292         dma_addr_t rxbuf_dma[MAX_RX_URBS];
 293 };
 294
 295 struct kvaser_usb_net_priv {
 296         struct can_priv can;
 297
 298         atomic_t active_tx_urbs;
 299         struct usb_anchor tx_submitted;
 300         struct kvaser_usb_tx_urb_context tx_contexts[MAX_TX_URBS];
 301
 302         struct completion start_comp, stop_comp;
 303
 304         struct kvaser_usb *dev;
 305         struct net_device *netdev;
 306         int channel;
 307
 308         struct can_berr_counter bec;
 309 };
 310
 311 static const struct usb_device_id kvaser_usb_table[] = {
 312         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
 313         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
 314         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
 315                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 316                                KVASER_HAS_SILENT_MODE },
 317         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
 318                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 319                                KVASER_HAS_SILENT_MODE },
 320         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
 321                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 322                                KVASER_HAS_SILENT_MODE },
 323         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
 324                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 325                                KVASER_HAS_SILENT_MODE },
 326         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
 327                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 328                                KVASER_HAS_SILENT_MODE },
 329         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
 330                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 331                                KVASER_HAS_SILENT_MODE },
 332         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
 333                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 334                                KVASER_HAS_SILENT_MODE },
 335         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
 336                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 337                                KVASER_HAS_SILENT_MODE },
 338         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
 339                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 340                                KVASER_HAS_SILENT_MODE },
 341         { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
 342                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 343         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
 344         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
 345                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 346                                KVASER_HAS_SILENT_MODE },
 347         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
 348                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 349         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
 350                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 351         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
 352                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 353         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
 354                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 355         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
 356                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 357         { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
 358                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 359         { }
 360 };
 361 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
 362
 363 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
 364                                       struct kvaser_msg *msg)
 365 {
 366         int actual_len;
 367
 368         return usb_bulk_msg(dev->udev,
 369                             usb_sndbulkpipe(dev->udev,
 370                                         dev->bulk_out->bEndpointAddress),
 371                             msg, msg->len, &actual_len,
 372                             USB_SEND_TIMEOUT);
 373 }
 374
 375 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
 376                                struct kvaser_msg *msg)
 377 {
 378         struct kvaser_msg *tmp;
 379         void *buf;
 380         int actual_len;
 381         int err;
 382         int pos = 0;
 383
 384         buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
 385         if (!buf)
 386                 return -ENOMEM;
 387
 388         err = usb_bulk_msg(dev->udev,
 389                            usb_rcvbulkpipe(dev->udev,
 390                                            dev->bulk_in->bEndpointAddress),
 391                            buf, RX_BUFFER_SIZE, &actual_len,
 392                            USB_RECV_TIMEOUT);
 393         if (err < 0)
 394                 goto end;
 395
 396         while (pos <= actual_len - MSG_HEADER_LEN) {
 397                 tmp = buf + pos;
 398
 399                 if (!tmp->len)
 400                         break;
 401
 402                 if (pos + tmp->len > actual_len) {
 403                         dev_err(dev->udev->dev.parent, "Format error\n");
 404                         break;
 405                 }
 406
 407                 if (tmp->id == id) {
 408                         memcpy(msg, tmp, tmp->len);
 409                         goto end;
 410                 }
 411
 412                 pos += tmp->len;
 413         }
 414
 415         err = -EINVAL;
 416
 417 end:
 418         kfree(buf);
 419
 420         return err;
 421 }
 422
 423 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
 424                                       u8 msg_id, int channel)
 425 {
 426         struct kvaser_msg *msg;
 427         int rc;
 428
 429         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 430         if (!msg)
 431                 return -ENOMEM;
 432
 433         msg->id = msg_id;
 434         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 435         msg->u.simple.channel = channel;
 436         msg->u.simple.tid = 0xff;
 437
 438         rc = kvaser_usb_send_msg(dev, msg);
 439
 440         kfree(msg);
 441         return rc;
 442 }
 443
 444 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
 445 {
 446         struct kvaser_msg msg;
 447         int err;
 448
 449         err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
 450         if (err)
 451                 return err;
 452
 453         err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
 454         if (err)
 455                 return err;
 456
 457         dev->fw_version = le32_to_cpu(msg.u.softinfo.fw_version);
 458
 459         return 0;
 460 }
 461
 462 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
 463 {
 464         struct kvaser_msg msg;
 465         int err;
 466
 467         err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
 468         if (err)
 469                 return err;
 470
 471         err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
 472         if (err)
 473                 return err;
 474
 475         dev->nchannels = msg.u.cardinfo.nchannels;
 476         if (dev->nchannels > MAX_NET_DEVICES)
 477                 return -EINVAL;
 478
 479         return 0;
 480 }
 481
 482 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
 483                                       const struct kvaser_msg *msg)
 484 {
 485         struct net_device_stats *stats;
 486         struct kvaser_usb_tx_urb_context *context;
 487         struct kvaser_usb_net_priv *priv;
 488         struct sk_buff *skb;
 489         struct can_frame *cf;
 490         u8 channel = msg->u.tx_acknowledge.channel;
 491         u8 tid = msg->u.tx_acknowledge.tid;
 492
 493         if (channel >= dev->nchannels) {
 494                 dev_err(dev->udev->dev.parent,
 495                         "Invalid channel number (%d)\n", channel);
 496                 return;
 497         }
 498
 499         priv = dev->nets[channel];
 500
 501         if (!netif_device_present(priv->netdev))
 502                 return;
 503
 504         stats = &priv->netdev->stats;
 505
 506         context = &priv->tx_contexts[tid % MAX_TX_URBS];
 507
 508         /* Sometimes the state change doesn't come after a bus-off event */
 509         if (priv->can.restart_ms &&
 510             (priv->can.state >= CAN_STATE_BUS_OFF)) {
 511                 skb = alloc_can_err_skb(priv->netdev, &cf);
 512                 if (skb) {
 513                         cf->can_id |= CAN_ERR_RESTARTED;
 514                         netif_rx(skb);
 515
 516                         stats->rx_packets++;
 517                         stats->rx_bytes += cf->can_dlc;
 518                 } else {
 519                         netdev_err(priv->netdev,
 520                                    "No memory left for err_skb\n");
 521                 }
 522
 523                 priv->can.can_stats.restarts++;
 524                 netif_carrier_on(priv->netdev);
 525
 526                 priv->can.state = CAN_STATE_ERROR_ACTIVE;
 527         }
 528
 529         stats->tx_packets++;
 530         stats->tx_bytes += context->dlc;
 531         can_get_echo_skb(priv->netdev, context->echo_index);
 532
 533         context->echo_index = MAX_TX_URBS;
 534         atomic_dec(&priv->active_tx_urbs);
 535
 536         netif_wake_queue(priv->netdev);
 537 }
 538
 539 static void kvaser_usb_simple_msg_callback(struct urb *urb)
 540 {
 541         struct net_device *netdev = urb->context;
 542
 543         kfree(urb->transfer_buffer);
 544
 545         if (urb->status)
 546                 netdev_warn(netdev, "urb status received: %d\n",
 547                             urb->status);
 548 }
 549
 550 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
 551                                        u8 msg_id)
 552 {
 553         struct kvaser_usb *dev = priv->dev;
 554         struct net_device *netdev = priv->netdev;
 555         struct kvaser_msg *msg;
 556         struct urb *urb;
 557         void *buf;
 558         int err;
 559
 560         urb = usb_alloc_urb(0, GFP_ATOMIC);
 561         if (!urb) {
 562                 netdev_err(netdev, "No memory left for URBs\n");
 563                 return -ENOMEM;
 564         }
 565
 566         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
 567         if (!buf) {
 568                 usb_free_urb(urb);
 569                 return -ENOMEM;
 570         }
 571
 572         msg = (struct kvaser_msg *)buf;
 573         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 574         msg->id = msg_id;
 575         msg->u.simple.channel = priv->channel;
 576
 577         usb_fill_bulk_urb(urb, dev->udev,
 578                           usb_sndbulkpipe(dev->udev,
 579                                           dev->bulk_out->bEndpointAddress),
 580                           buf, msg->len,
 581                           kvaser_usb_simple_msg_callback, priv);
 582         usb_anchor_urb(urb, &priv->tx_submitted);
 583
 584         err = usb_submit_urb(urb, GFP_ATOMIC);
 585         if (err) {
 586                 netdev_err(netdev, "Error transmitting URB\n");
 587                 usb_unanchor_urb(urb);
 588                 usb_free_urb(urb);
 589                 kfree(buf);
 590                 return err;
 591         }
 592
 593         usb_free_urb(urb);
 594
 595         return 0;
 596 }
 597
 598 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
 599 {
 600         int i;
 601
 602         usb_kill_anchored_urbs(&priv->tx_submitted);
 603         atomic_set(&priv->active_tx_urbs, 0);
 604
 605         for (i = 0; i < MAX_TX_URBS; i++)
 606                 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
 607 }
 608
 609 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
 610                                 const struct kvaser_msg *msg)
 611 {
 612         struct can_frame *cf;
 613         struct sk_buff *skb;
 614         struct net_device_stats *stats;
 615         struct kvaser_usb_net_priv *priv;
 616         unsigned int new_state;
 617         u8 channel, status, txerr, rxerr, error_factor;
 618
 619         switch (msg->id) {
 620         case CMD_CAN_ERROR_EVENT:
 621                 channel = msg->u.error_event.channel;
 622                 status =  msg->u.error_event.status;
 623                 txerr = msg->u.error_event.tx_errors_count;
 624                 rxerr = msg->u.error_event.rx_errors_count;
 625                 error_factor = msg->u.error_event.error_factor;
 626                 break;
 627         case CMD_LOG_MESSAGE:
 628                 channel = msg->u.log_message.channel;
 629                 status = msg->u.log_message.data[0];
 630                 txerr = msg->u.log_message.data[2];
 631                 rxerr = msg->u.log_message.data[3];
 632                 error_factor = msg->u.log_message.data[1];
 633                 break;
 634         case CMD_CHIP_STATE_EVENT:
 635                 channel = msg->u.chip_state_event.channel;
 636                 status =  msg->u.chip_state_event.status;
 637                 txerr = msg->u.chip_state_event.tx_errors_count;
 638                 rxerr = msg->u.chip_state_event.rx_errors_count;
 639                 error_factor = 0;
 640                 break;
 641         default:
 642                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
 643                         msg->id);
 644                 return;
 645         }
 646
 647         if (channel >= dev->nchannels) {
 648                 dev_err(dev->udev->dev.parent,
 649                         "Invalid channel number (%d)\n", channel);
 650                 return;
 651         }
 652
 653         priv = dev->nets[channel];
 654         stats = &priv->netdev->stats;
 655
 656         if (status & M16C_STATE_BUS_RESET) {
 657                 kvaser_usb_unlink_tx_urbs(priv);
 658                 return;
 659         }
 660
 661         skb = alloc_can_err_skb(priv->netdev, &cf);
 662         if (!skb) {
 663                 stats->rx_dropped++;
 664                 return;
 665         }
 666
 667         new_state = priv->can.state;
 668
 669         netdev_dbg(priv->netdev, "Error status: 0x%02x\n", status);
 670
 671         if (status & M16C_STATE_BUS_OFF) {
 672                 cf->can_id |= CAN_ERR_BUSOFF;
 673
 674                 priv->can.can_stats.bus_off++;
 675                 if (!priv->can.restart_ms)
 676                         kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
 677
 678                 netif_carrier_off(priv->netdev);
 679
 680                 new_state = CAN_STATE_BUS_OFF;
 681         } else if (status & M16C_STATE_BUS_PASSIVE) {
 682                 if (priv->can.state != CAN_STATE_ERROR_PASSIVE) {
 683                         cf->can_id |= CAN_ERR_CRTL;
 684
 685                         if (txerr || rxerr)
 686                                 cf->data[1] = (txerr > rxerr)
 687                                                 ? CAN_ERR_CRTL_TX_PASSIVE
 688                                                 : CAN_ERR_CRTL_RX_PASSIVE;
 689                         else
 690                                 cf->data[1] = CAN_ERR_CRTL_TX_PASSIVE |
 691                                               CAN_ERR_CRTL_RX_PASSIVE;
 692
 693                         priv->can.can_stats.error_passive++;
 694                 }
 695
 696                 new_state = CAN_STATE_ERROR_PASSIVE;
 697         }
 698
 699         if (status == M16C_STATE_BUS_ERROR) {
 700                 if ((priv->can.state < CAN_STATE_ERROR_WARNING) &&
 701                     ((txerr >= 96) || (rxerr >= 96))) {
 702                         cf->can_id |= CAN_ERR_CRTL;
 703                         cf->data[1] = (txerr > rxerr)
 704                                         ? CAN_ERR_CRTL_TX_WARNING
 705                                         : CAN_ERR_CRTL_RX_WARNING;
 706
 707                         priv->can.can_stats.error_warning++;
 708                         new_state = CAN_STATE_ERROR_WARNING;
 709                 } else if (priv->can.state > CAN_STATE_ERROR_ACTIVE) {
 710                         cf->can_id |= CAN_ERR_PROT;
 711                         cf->data[2] = CAN_ERR_PROT_ACTIVE;
 712
 713                         new_state = CAN_STATE_ERROR_ACTIVE;
 714                 }
 715         }
 716
 717         if (!status) {
 718                 cf->can_id |= CAN_ERR_PROT;
 719                 cf->data[2] = CAN_ERR_PROT_ACTIVE;
 720
 721                 new_state = CAN_STATE_ERROR_ACTIVE;
 722         }
 723
 724         if (priv->can.restart_ms &&
 725             (priv->can.state >= CAN_STATE_BUS_OFF) &&
 726             (new_state < CAN_STATE_BUS_OFF)) {
 727                 cf->can_id |= CAN_ERR_RESTARTED;
 728                 netif_carrier_on(priv->netdev);
 729
 730                 priv->can.can_stats.restarts++;
 731         }
 732
 733         if (error_factor) {
 734                 priv->can.can_stats.bus_error++;
 735                 stats->rx_errors++;
 736
 737                 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
 738
 739                 if (error_factor & M16C_EF_ACKE)
 740                         cf->data[3] |= (CAN_ERR_PROT_LOC_ACK);
 741                 if (error_factor & M16C_EF_CRCE)
 742                         cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
 743                                         CAN_ERR_PROT_LOC_CRC_DEL);
 744                 if (error_factor & M16C_EF_FORME)
 745                         cf->data[2] |= CAN_ERR_PROT_FORM;
 746                 if (error_factor & M16C_EF_STFE)
 747                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 748                 if (error_factor & M16C_EF_BITE0)
 749                         cf->data[2] |= CAN_ERR_PROT_BIT0;
 750                 if (error_factor & M16C_EF_BITE1)
 751                         cf->data[2] |= CAN_ERR_PROT_BIT1;
 752                 if (error_factor & M16C_EF_TRE)
 753                         cf->data[2] |= CAN_ERR_PROT_TX;
 754         }
 755
 756         cf->data[6] = txerr;
 757         cf->data[7] = rxerr;
 758
 759         priv->bec.txerr = txerr;
 760         priv->bec.rxerr = rxerr;
 761
 762         priv->can.state = new_state;
 763
 764         netif_rx(skb);
 765
 766         stats->rx_packets++;
 767         stats->rx_bytes += cf->can_dlc;
 768 }
 769
 770 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
 771                                   const struct kvaser_msg *msg)
 772 {
 773         struct can_frame *cf;
 774         struct sk_buff *skb;
 775         struct net_device_stats *stats = &priv->netdev->stats;
 776
 777         if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
 778                                          MSG_FLAG_NERR)) {
 779                 netdev_err(priv->netdev, "Unknow error (flags: 0x%02x)\n",
 780                            msg->u.rx_can.flag);
 781
 782                 stats->rx_errors++;
 783                 return;
 784         }
 785
 786         if (msg->u.rx_can.flag & MSG_FLAG_OVERRUN) {
 787                 skb = alloc_can_err_skb(priv->netdev, &cf);
 788                 if (!skb) {
 789                         stats->rx_dropped++;
 790                         return;
 791                 }
 792
 793                 cf->can_id |= CAN_ERR_CRTL;
 794                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 795
 796                 stats->rx_over_errors++;
 797                 stats->rx_errors++;
 798
 799                 netif_rx(skb);
 800
 801                 stats->rx_packets++;
 802                 stats->rx_bytes += cf->can_dlc;
 803         }
 804 }
 805
 806 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
 807                                   const struct kvaser_msg *msg)
 808 {
 809         struct kvaser_usb_net_priv *priv;
 810         struct can_frame *cf;
 811         struct sk_buff *skb;
 812         struct net_device_stats *stats;
 813         u8 channel = msg->u.rx_can.channel;
 814
 815         if (channel >= dev->nchannels) {
 816                 dev_err(dev->udev->dev.parent,
 817                         "Invalid channel number (%d)\n", channel);
 818                 return;
 819         }
 820
 821         priv = dev->nets[channel];
 822         stats = &priv->netdev->stats;
 823
 824         if ((msg->u.rx_can.flag & MSG_FLAG_ERROR_FRAME) &&
 825             (msg->id == CMD_LOG_MESSAGE)) {
 826                 kvaser_usb_rx_error(dev, msg);
 827                 return;
 828         } else if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
 829                                          MSG_FLAG_NERR |
 830                                          MSG_FLAG_OVERRUN)) {
 831                 kvaser_usb_rx_can_err(priv, msg);
 832                 return;
 833         } else if (msg->u.rx_can.flag & ~MSG_FLAG_REMOTE_FRAME) {
 834                 netdev_warn(priv->netdev,
 835                             "Unhandled frame (flags: 0x%02x)",
 836                             msg->u.rx_can.flag);
 837                 return;
 838         }
 839
 840         skb = alloc_can_skb(priv->netdev, &cf);
 841         if (!skb) {
 842                 stats->tx_dropped++;
 843                 return;
 844         }
 845
 846         if (msg->id == CMD_LOG_MESSAGE) {
 847                 cf->can_id = le32_to_cpu(msg->u.log_message.id);
 848                 if (cf->can_id & KVASER_EXTENDED_FRAME)
 849                         cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
 850                 else
 851                         cf->can_id &= CAN_SFF_MASK;
 852
 853                 cf->can_dlc = get_can_dlc(msg->u.log_message.dlc);
 854
 855                 if (msg->u.log_message.flags & MSG_FLAG_REMOTE_FRAME)
 856                         cf->can_id |= CAN_RTR_FLAG;
 857                 else
 858                         memcpy(cf->data, &msg->u.log_message.data,
 859                                cf->can_dlc);
 860         } else {
 861                 cf->can_id = ((msg->u.rx_can.msg[0] & 0x1f) << 6) |
 862                              (msg->u.rx_can.msg[1] & 0x3f);
 863
 864                 if (msg->id == CMD_RX_EXT_MESSAGE) {
 865                         cf->can_id <<= 18;
 866                         cf->can_id |= ((msg->u.rx_can.msg[2] & 0x0f) << 14) |
 867                                       ((msg->u.rx_can.msg[3] & 0xff) << 6) |
 868                                       (msg->u.rx_can.msg[4] & 0x3f);
 869                         cf->can_id |= CAN_EFF_FLAG;
 870                 }
 871
 872                 cf->can_dlc = get_can_dlc(msg->u.rx_can.msg[5]);
 873
 874                 if (msg->u.rx_can.flag & MSG_FLAG_REMOTE_FRAME)
 875                         cf->can_id |= CAN_RTR_FLAG;
 876                 else
 877                         memcpy(cf->data, &msg->u.rx_can.msg[6],
 878                                cf->can_dlc);
 879         }
 880
 881         netif_rx(skb);
 882
 883         stats->rx_packets++;
 884         stats->rx_bytes += cf->can_dlc;
 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         priv->can.state = CAN_STATE_STOPPED;
1241         close_candev(priv->netdev);
1242
1243         return 0;
1244 }
1245
1246 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1247 {
1248         struct kvaser_usb_tx_urb_context *context = urb->context;
1249         struct kvaser_usb_net_priv *priv;
1250         struct net_device *netdev;
1251
1252         if (WARN_ON(!context))
1253                 return;
1254
1255         priv = context->priv;
1256         netdev = priv->netdev;
1257
1258         kfree(urb->transfer_buffer);
1259
1260         if (!netif_device_present(netdev))
1261                 return;
1262
1263         if (urb->status)
1264                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1265 }
1266
1267 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1268                                          struct net_device *netdev)
1269 {
1270         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1271         struct kvaser_usb *dev = priv->dev;
1272         struct net_device_stats *stats = &netdev->stats;
1273         struct can_frame *cf = (struct can_frame *)skb->data;
1274         struct kvaser_usb_tx_urb_context *context = NULL;
1275         struct urb *urb;
1276         void *buf;
1277         struct kvaser_msg *msg;
1278         int i, err;
1279         int ret = NETDEV_TX_OK;
1280
1281         if (can_dropped_invalid_skb(netdev, skb))
1282                 return NETDEV_TX_OK;
1283
1284         urb = usb_alloc_urb(0, GFP_ATOMIC);
1285         if (!urb) {
1286                 netdev_err(netdev, "No memory left for URBs\n");
1287                 stats->tx_dropped++;
1288                 goto nourbmem;
1289         }
1290
1291         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1292         if (!buf) {
1293                 stats->tx_dropped++;
1294                 goto nobufmem;
1295         }
1296
1297         msg = buf;
1298         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1299         msg->u.tx_can.flags = 0;
1300         msg->u.tx_can.channel = priv->channel;
1301
1302         if (cf->can_id & CAN_EFF_FLAG) {
1303                 msg->id = CMD_TX_EXT_MESSAGE;
1304                 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1305                 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1306                 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1307                 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1308                 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1309         } else {
1310                 msg->id = CMD_TX_STD_MESSAGE;
1311                 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1312                 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1313         }
1314
1315         msg->u.tx_can.msg[5] = cf->can_dlc;
1316         memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1317
1318         if (cf->can_id & CAN_RTR_FLAG)
1319                 msg->u.tx_can.flags |= MSG_FLAG_REMOTE_FRAME;
1320
1321         for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++) {
1322                 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
1323                         context = &priv->tx_contexts[i];
1324                         break;
1325                 }
1326         }
1327
1328         if (!context) {
1329                 netdev_warn(netdev, "cannot find free context\n");
1330                 ret =  NETDEV_TX_BUSY;
1331                 goto releasebuf;
1332         }
1333
1334         context->priv = priv;
1335         context->echo_index = i;
1336         context->dlc = cf->can_dlc;
1337
1338         msg->u.tx_can.tid = context->echo_index;
1339
1340         usb_fill_bulk_urb(urb, dev->udev,
1341                           usb_sndbulkpipe(dev->udev,
1342                                           dev->bulk_out->bEndpointAddress),
1343                           buf, msg->len,
1344                           kvaser_usb_write_bulk_callback, context);
1345         usb_anchor_urb(urb, &priv->tx_submitted);
1346
1347         can_put_echo_skb(skb, netdev, context->echo_index);
1348
1349         atomic_inc(&priv->active_tx_urbs);
1350
1351         if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
1352                 netif_stop_queue(netdev);
1353
1354         err = usb_submit_urb(urb, GFP_ATOMIC);
1355         if (unlikely(err)) {
1356                 can_free_echo_skb(netdev, context->echo_index);
1357
1358                 skb = NULL; /* set to NULL to avoid double free in
1359                              * dev_kfree_skb(skb) */
1360
1361                 atomic_dec(&priv->active_tx_urbs);
1362                 usb_unanchor_urb(urb);
1363
1364                 stats->tx_dropped++;
1365
1366                 if (err == -ENODEV)
1367                         netif_device_detach(netdev);
1368                 else
1369                         netdev_warn(netdev, "Failed tx_urb %d\n", err);
1370
1371                 goto releasebuf;
1372         }
1373
1374         usb_free_urb(urb);
1375
1376         return NETDEV_TX_OK;
1377
1378 releasebuf:
1379         kfree(buf);
1380 nobufmem:
1381         usb_free_urb(urb);
1382 nourbmem:
1383         dev_kfree_skb(skb);
1384         return ret;
1385 }
1386
1387 static const struct net_device_ops kvaser_usb_netdev_ops = {
1388         .ndo_open = kvaser_usb_open,
1389         .ndo_stop = kvaser_usb_close,
1390         .ndo_start_xmit = kvaser_usb_start_xmit,
1391 };
1392
1393 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1394         .name = "kvaser_usb",
1395         .tseg1_min = KVASER_USB_TSEG1_MIN,
1396         .tseg1_max = KVASER_USB_TSEG1_MAX,
1397         .tseg2_min = KVASER_USB_TSEG2_MIN,
1398         .tseg2_max = KVASER_USB_TSEG2_MAX,
1399         .sjw_max = KVASER_USB_SJW_MAX,
1400         .brp_min = KVASER_USB_BRP_MIN,
1401         .brp_max = KVASER_USB_BRP_MAX,
1402         .brp_inc = KVASER_USB_BRP_INC,
1403 };
1404
1405 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1406 {
1407         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1408         struct can_bittiming *bt = &priv->can.bittiming;
1409         struct kvaser_usb *dev = priv->dev;
1410         struct kvaser_msg *msg;
1411         int rc;
1412
1413         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1414         if (!msg)
1415                 return -ENOMEM;
1416
1417         msg->id = CMD_SET_BUS_PARAMS;
1418         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1419         msg->u.busparams.channel = priv->channel;
1420         msg->u.busparams.tid = 0xff;
1421         msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1422         msg->u.busparams.sjw = bt->sjw;
1423         msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1424         msg->u.busparams.tseg2 = bt->phase_seg2;
1425
1426         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1427                 msg->u.busparams.no_samp = 3;
1428         else
1429                 msg->u.busparams.no_samp = 1;
1430
1431         rc = kvaser_usb_send_msg(dev, msg);
1432
1433         kfree(msg);
1434         return rc;
1435 }
1436
1437 static int kvaser_usb_set_mode(struct net_device *netdev,
1438                                enum can_mode mode)
1439 {
1440         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1441         int err;
1442
1443         switch (mode) {
1444         case CAN_MODE_START:
1445                 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1446                 if (err)
1447                         return err;
1448                 break;
1449         default:
1450                 return -EOPNOTSUPP;
1451         }
1452
1453         return 0;
1454 }
1455
1456 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1457                                        struct can_berr_counter *bec)
1458 {
1459         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1460
1461         *bec = priv->bec;
1462
1463         return 0;
1464 }
1465
1466 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1467 {
1468         int i;
1469
1470         for (i = 0; i < dev->nchannels; i++) {
1471                 if (!dev->nets[i])
1472                         continue;
1473
1474                 unregister_netdev(dev->nets[i]->netdev);
1475         }
1476
1477         kvaser_usb_unlink_all_urbs(dev);
1478
1479         for (i = 0; i < dev->nchannels; i++) {
1480                 if (!dev->nets[i])
1481                         continue;
1482
1483                 free_candev(dev->nets[i]->netdev);
1484         }
1485 }
1486
1487 static int kvaser_usb_init_one(struct usb_interface *intf,
1488                                const struct usb_device_id *id, int channel)
1489 {
1490         struct kvaser_usb *dev = usb_get_intfdata(intf);
1491         struct net_device *netdev;
1492         struct kvaser_usb_net_priv *priv;
1493         int i, err;
1494
1495         netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
1496         if (!netdev) {
1497                 dev_err(&intf->dev, "Cannot alloc candev\n");
1498                 return -ENOMEM;
1499         }
1500
1501         priv = netdev_priv(netdev);
1502
1503         init_completion(&priv->start_comp);
1504         init_completion(&priv->stop_comp);
1505
1506         init_usb_anchor(&priv->tx_submitted);
1507         atomic_set(&priv->active_tx_urbs, 0);
1508
1509         for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++)
1510                 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
1511
1512         priv->dev = dev;
1513         priv->netdev = netdev;
1514         priv->channel = channel;
1515
1516         priv->can.state = CAN_STATE_STOPPED;
1517         priv->can.clock.freq = CAN_USB_CLOCK;
1518         priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1519         priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1520         priv->can.do_set_mode = kvaser_usb_set_mode;
1521         if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1522                 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1523         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1524         if (id->driver_info & KVASER_HAS_SILENT_MODE)
1525                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1526
1527         netdev->flags |= IFF_ECHO;
1528
1529         netdev->netdev_ops = &kvaser_usb_netdev_ops;
1530
1531         SET_NETDEV_DEV(netdev, &intf->dev);
1532
1533         dev->nets[channel] = priv;
1534
1535         err = register_candev(netdev);
1536         if (err) {
1537                 dev_err(&intf->dev, "Failed to register can device\n");
1538                 free_candev(netdev);
1539                 dev->nets[channel] = NULL;
1540                 return err;
1541         }
1542
1543         netdev_dbg(netdev, "device registered\n");
1544
1545         return 0;
1546 }
1547
1548 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1549                                     struct usb_endpoint_descriptor **in,
1550                                     struct usb_endpoint_descriptor **out)
1551 {
1552         const struct usb_host_interface *iface_desc;
1553         struct usb_endpoint_descriptor *endpoint;
1554         int i;
1555
1556         iface_desc = &intf->altsetting[0];
1557
1558         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1559                 endpoint = &iface_desc->endpoint[i].desc;
1560
1561                 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1562                         *in = endpoint;
1563
1564                 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1565                         *out = endpoint;
1566
1567                 /* use first bulk endpoint for in and out */
1568                 if (*in && *out)
1569                         return 0;
1570         }
1571
1572         return -ENODEV;
1573 }
1574
1575 static int kvaser_usb_probe(struct usb_interface *intf,
1576                             const struct usb_device_id *id)
1577 {
1578         struct kvaser_usb *dev;
1579         int err = -ENOMEM;
1580         int i;
1581
1582         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1583         if (!dev)
1584                 return -ENOMEM;
1585
1586         err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
1587         if (err) {
1588                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
1589                 return err;
1590         }
1591
1592         dev->udev = interface_to_usbdev(intf);
1593
1594         init_usb_anchor(&dev->rx_submitted);
1595
1596         usb_set_intfdata(intf, dev);
1597
1598         for (i = 0; i < MAX_NET_DEVICES; i++)
1599                 kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, i);
1600
1601         err = kvaser_usb_get_software_info(dev);
1602         if (err) {
1603                 dev_err(&intf->dev,
1604                         "Cannot get software infos, error %d\n", err);
1605                 return err;
1606         }
1607
1608         err = kvaser_usb_get_card_info(dev);
1609         if (err) {
1610                 dev_err(&intf->dev,
1611                         "Cannot get card infos, error %d\n", err);
1612                 return err;
1613         }
1614
1615         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
1616                 ((dev->fw_version >> 24) & 0xff),
1617                 ((dev->fw_version >> 16) & 0xff),
1618                 (dev->fw_version & 0xffff));
1619
1620         for (i = 0; i < dev->nchannels; i++) {
1621                 err = kvaser_usb_init_one(intf, id, i);
1622                 if (err) {
1623                         kvaser_usb_remove_interfaces(dev);
1624                         return err;
1625                 }
1626         }
1627
1628         return 0;
1629 }
1630
1631 static void kvaser_usb_disconnect(struct usb_interface *intf)
1632 {
1633         struct kvaser_usb *dev = usb_get_intfdata(intf);
1634
1635         usb_set_intfdata(intf, NULL);
1636
1637         if (!dev)
1638                 return;
1639
1640         kvaser_usb_remove_interfaces(dev);
1641 }
1642
1643 static struct usb_driver kvaser_usb_driver = {
1644         .name = "kvaser_usb",
1645         .probe = kvaser_usb_probe,
1646         .disconnect = kvaser_usb_disconnect,
1647         .id_table = kvaser_usb_table,
1648 };
1649
1650 module_usb_driver(kvaser_usb_driver);
1651
1652 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
1653 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
1654 MODULE_LICENSE("GPL v2");