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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Parts of this driver are based on the following:
   3  *  - Kvaser linux leaf driver (version 4.78)
   4  *  - CAN driver for esd CAN-USB/2
   5  *  - Kvaser linux usbcanII driver (version 5.3)
   6  *  - Kvaser linux mhydra driver (version 5.24)
   7  *
   8  * Copyright (C) 2002-2018 KVASER AB, Sweden. All rights reserved.
   9  * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
  10  * Copyright (C) 2012 Olivier Sobrie <olivier@sobrie.be>
  11  * Copyright (C) 2015 Valeo S.A.
  12  */
  13
  14 #include <linux/completion.h>
  15 #include <linux/device.h>
  16 #include <linux/gfp.h>
  17 #include <linux/if.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/types.h>
  23 #include <linux/usb.h>
  24
  25 #include <linux/can.h>
  26 #include <linux/can/dev.h>
  27 #include <linux/can/error.h>
  28 #include <linux/can/netlink.h>
  29
  30 #include "kvaser_usb.h"
  31
  32 /* Kvaser USB vendor id. */
  33 #define KVASER_VENDOR_ID                        0x0bfd
  34
  35 /* Kvaser Leaf USB devices product ids */
  36 #define USB_LEAF_DEVEL_PRODUCT_ID               10
  37 #define USB_LEAF_LITE_PRODUCT_ID                11
  38 #define USB_LEAF_PRO_PRODUCT_ID                 12
  39 #define USB_LEAF_SPRO_PRODUCT_ID                14
  40 #define USB_LEAF_PRO_LS_PRODUCT_ID              15
  41 #define USB_LEAF_PRO_SWC_PRODUCT_ID             16
  42 #define USB_LEAF_PRO_LIN_PRODUCT_ID             17
  43 #define USB_LEAF_SPRO_LS_PRODUCT_ID             18
  44 #define USB_LEAF_SPRO_SWC_PRODUCT_ID            19
  45 #define USB_MEMO2_DEVEL_PRODUCT_ID              22
  46 #define USB_MEMO2_HSHS_PRODUCT_ID               23
  47 #define USB_UPRO_HSHS_PRODUCT_ID                24
  48 #define USB_LEAF_LITE_GI_PRODUCT_ID             25
  49 #define USB_LEAF_PRO_OBDII_PRODUCT_ID           26
  50 #define USB_MEMO2_HSLS_PRODUCT_ID               27
  51 #define USB_LEAF_LITE_CH_PRODUCT_ID             28
  52 #define USB_BLACKBIRD_SPRO_PRODUCT_ID           29
  53 #define USB_OEM_MERCURY_PRODUCT_ID              34
  54 #define USB_OEM_LEAF_PRODUCT_ID                 35
  55 #define USB_CAN_R_PRODUCT_ID                    39
  56 #define USB_LEAF_LITE_V2_PRODUCT_ID             288
  57 #define USB_MINI_PCIE_HS_PRODUCT_ID             289
  58 #define USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID     290
  59 #define USB_USBCAN_LIGHT_2HS_PRODUCT_ID         291
  60 #define USB_MINI_PCIE_2HS_PRODUCT_ID            292
  61 #define USB_USBCAN_R_V2_PRODUCT_ID              294
  62 #define USB_LEAF_LIGHT_R_V2_PRODUCT_ID          295
  63 #define USB_LEAF_LIGHT_HS_V2_OEM2_PRODUCT_ID    296
  64 #define USB_LEAF_PRODUCT_ID_END \
  65         USB_LEAF_LIGHT_HS_V2_OEM2_PRODUCT_ID
  66
  67 /* Kvaser USBCan-II devices product ids */
  68 #define USB_USBCAN_REVB_PRODUCT_ID              2
  69 #define USB_VCI2_PRODUCT_ID                     3
  70 #define USB_USBCAN2_PRODUCT_ID                  4
  71 #define USB_MEMORATOR_PRODUCT_ID                5
  72
  73 /* Kvaser Minihydra USB devices product ids */
  74 #define USB_BLACKBIRD_V2_PRODUCT_ID             258
  75 #define USB_MEMO_PRO_5HS_PRODUCT_ID             260
  76 #define USB_USBCAN_PRO_5HS_PRODUCT_ID           261
  77 #define USB_USBCAN_LIGHT_4HS_PRODUCT_ID         262
  78 #define USB_LEAF_PRO_HS_V2_PRODUCT_ID           263
  79 #define USB_USBCAN_PRO_2HS_V2_PRODUCT_ID        264
  80 #define USB_MEMO_2HS_PRODUCT_ID                 265
  81 #define USB_MEMO_PRO_2HS_V2_PRODUCT_ID          266
  82 #define USB_HYBRID_CANLIN_PRODUCT_ID            267
  83 #define USB_ATI_USBCAN_PRO_2HS_V2_PRODUCT_ID    268
  84 #define USB_ATI_MEMO_PRO_2HS_V2_PRODUCT_ID      269
  85 #define USB_HYBRID_PRO_CANLIN_PRODUCT_ID        270
  86 #define USB_U100_PRODUCT_ID                     273
  87 #define USB_U100P_PRODUCT_ID                    274
  88 #define USB_U100S_PRODUCT_ID                    275
  89 #define USB_HYDRA_PRODUCT_ID_END \
  90         USB_U100S_PRODUCT_ID
  91
  92 static inline bool kvaser_is_leaf(const struct usb_device_id *id)
  93 {
  94         return (id->idProduct >= USB_LEAF_DEVEL_PRODUCT_ID &&
  95                 id->idProduct <= USB_CAN_R_PRODUCT_ID) ||
  96                 (id->idProduct >= USB_LEAF_LITE_V2_PRODUCT_ID &&
  97                  id->idProduct <= USB_LEAF_PRODUCT_ID_END);
  98 }
  99
 100 static inline bool kvaser_is_usbcan(const struct usb_device_id *id)
 101 {
 102         return id->idProduct >= USB_USBCAN_REVB_PRODUCT_ID &&
 103                id->idProduct <= USB_MEMORATOR_PRODUCT_ID;
 104 }
 105
 106 static inline bool kvaser_is_hydra(const struct usb_device_id *id)
 107 {
 108         return id->idProduct >= USB_BLACKBIRD_V2_PRODUCT_ID &&
 109                id->idProduct <= USB_HYDRA_PRODUCT_ID_END;
 110 }
 111
 112 static const struct usb_device_id kvaser_usb_table[] = {
 113         /* Leaf USB product IDs */
 114         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
 115         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
 116         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
 117                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 118                                KVASER_USB_HAS_SILENT_MODE },
 119         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
 120                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 121                                KVASER_USB_HAS_SILENT_MODE },
 122         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
 123                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 124                                KVASER_USB_HAS_SILENT_MODE },
 125         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
 126                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 127                                KVASER_USB_HAS_SILENT_MODE },
 128         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
 129                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 130                                KVASER_USB_HAS_SILENT_MODE },
 131         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
 132                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 133                                KVASER_USB_HAS_SILENT_MODE },
 134         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
 135                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 136                                KVASER_USB_HAS_SILENT_MODE },
 137         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
 138                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 139                                KVASER_USB_HAS_SILENT_MODE },
 140         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
 141                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 142                                KVASER_USB_HAS_SILENT_MODE },
 143         { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
 144                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 145         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
 146         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
 147                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 148                                KVASER_USB_HAS_SILENT_MODE },
 149         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
 150                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 151         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
 152                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 153         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
 154                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 155         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
 156                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 157         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
 158                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 159         { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
 160                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 161         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
 162         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
 163         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID) },
 164         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_2HS_PRODUCT_ID) },
 165         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_2HS_PRODUCT_ID) },
 166         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_R_V2_PRODUCT_ID) },
 167         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_R_V2_PRODUCT_ID) },
 168         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM2_PRODUCT_ID) },
 169
 170         /* USBCANII USB product IDs */
 171         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
 172                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 173         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
 174                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 175         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
 176                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 177         { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
 178                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 179
 180         /* Minihydra USB product IDs */
 181         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_V2_PRODUCT_ID) },
 182         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_PRO_5HS_PRODUCT_ID) },
 183         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_5HS_PRODUCT_ID) },
 184         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_4HS_PRODUCT_ID) },
 185         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_HS_V2_PRODUCT_ID) },
 186         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_2HS_V2_PRODUCT_ID) },
 187         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_2HS_PRODUCT_ID) },
 188         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_PRO_2HS_V2_PRODUCT_ID) },
 189         { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_CANLIN_PRODUCT_ID) },
 190         { USB_DEVICE(KVASER_VENDOR_ID, USB_ATI_USBCAN_PRO_2HS_V2_PRODUCT_ID) },
 191         { USB_DEVICE(KVASER_VENDOR_ID, USB_ATI_MEMO_PRO_2HS_V2_PRODUCT_ID) },
 192         { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_PRO_CANLIN_PRODUCT_ID) },
 193         { USB_DEVICE(KVASER_VENDOR_ID, USB_U100_PRODUCT_ID) },
 194         { USB_DEVICE(KVASER_VENDOR_ID, USB_U100P_PRODUCT_ID) },
 195         { USB_DEVICE(KVASER_VENDOR_ID, USB_U100S_PRODUCT_ID) },
 196         { }
 197 };
 198 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
 199
 200 int kvaser_usb_send_cmd(const struct kvaser_usb *dev, void *cmd, int len)
 201 {
 202         int actual_len; /* Not used */
 203
 204         return usb_bulk_msg(dev->udev,
 205                             usb_sndbulkpipe(dev->udev,
 206                                             dev->bulk_out->bEndpointAddress),
 207                             cmd, len, &actual_len, KVASER_USB_TIMEOUT);
 208 }
 209
 210 int kvaser_usb_recv_cmd(const struct kvaser_usb *dev, void *cmd, int len,
 211                         int *actual_len)
 212 {
 213         return usb_bulk_msg(dev->udev,
 214                             usb_rcvbulkpipe(dev->udev,
 215                                             dev->bulk_in->bEndpointAddress),
 216                             cmd, len, actual_len, KVASER_USB_TIMEOUT);
 217 }
 218
 219 static void kvaser_usb_send_cmd_callback(struct urb *urb)
 220 {
 221         struct net_device *netdev = urb->context;
 222
 223         kfree(urb->transfer_buffer);
 224
 225         if (urb->status)
 226                 netdev_warn(netdev, "urb status received: %d\n", urb->status);
 227 }
 228
 229 int kvaser_usb_send_cmd_async(struct kvaser_usb_net_priv *priv, void *cmd,
 230                               int len)
 231 {
 232         struct kvaser_usb *dev = priv->dev;
 233         struct net_device *netdev = priv->netdev;
 234         struct urb *urb;
 235         int err;
 236
 237         urb = usb_alloc_urb(0, GFP_ATOMIC);
 238         if (!urb)
 239                 return -ENOMEM;
 240
 241         usb_fill_bulk_urb(urb, dev->udev,
 242                           usb_sndbulkpipe(dev->udev,
 243                                           dev->bulk_out->bEndpointAddress),
 244                           cmd, len, kvaser_usb_send_cmd_callback, netdev);
 245         usb_anchor_urb(urb, &priv->tx_submitted);
 246
 247         err = usb_submit_urb(urb, GFP_ATOMIC);
 248         if (err) {
 249                 netdev_err(netdev, "Error transmitting URB\n");
 250                 usb_unanchor_urb(urb);
 251         }
 252         usb_free_urb(urb);
 253
 254         return 0;
 255 }
 256
 257 int kvaser_usb_can_rx_over_error(struct net_device *netdev)
 258 {
 259         struct net_device_stats *stats = &netdev->stats;
 260         struct can_frame *cf;
 261         struct sk_buff *skb;
 262
 263         stats->rx_over_errors++;
 264         stats->rx_errors++;
 265
 266         skb = alloc_can_err_skb(netdev, &cf);
 267         if (!skb) {
 268                 stats->rx_dropped++;
 269                 netdev_warn(netdev, "No memory left for err_skb\n");
 270                 return -ENOMEM;
 271         }
 272
 273         cf->can_id |= CAN_ERR_CRTL;
 274         cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 275
 276         stats->rx_packets++;
 277         stats->rx_bytes += cf->len;
 278         netif_rx(skb);
 279
 280         return 0;
 281 }
 282
 283 static void kvaser_usb_read_bulk_callback(struct urb *urb)
 284 {
 285         struct kvaser_usb *dev = urb->context;
 286         int err;
 287         unsigned int i;
 288
 289         switch (urb->status) {
 290         case 0:
 291                 break;
 292         case -ENOENT:
 293         case -EPIPE:
 294         case -EPROTO:
 295         case -ESHUTDOWN:
 296                 return;
 297         default:
 298                 dev_info(&dev->intf->dev, "Rx URB aborted (%d)\n", urb->status);
 299                 goto resubmit_urb;
 300         }
 301
 302         dev->ops->dev_read_bulk_callback(dev, urb->transfer_buffer,
 303                                          urb->actual_length);
 304
 305 resubmit_urb:
 306         usb_fill_bulk_urb(urb, dev->udev,
 307                           usb_rcvbulkpipe(dev->udev,
 308                                           dev->bulk_in->bEndpointAddress),
 309                           urb->transfer_buffer, KVASER_USB_RX_BUFFER_SIZE,
 310                           kvaser_usb_read_bulk_callback, dev);
 311
 312         err = usb_submit_urb(urb, GFP_ATOMIC);
 313         if (err == -ENODEV) {
 314                 for (i = 0; i < dev->nchannels; i++) {
 315                         if (!dev->nets[i])
 316                                 continue;
 317
 318                         netif_device_detach(dev->nets[i]->netdev);
 319                 }
 320         } else if (err) {
 321                 dev_err(&dev->intf->dev,
 322                         "Failed resubmitting read bulk urb: %d\n", err);
 323         }
 324 }
 325
 326 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
 327 {
 328         int i, err = 0;
 329
 330         if (dev->rxinitdone)
 331                 return 0;
 332
 333         for (i = 0; i < KVASER_USB_MAX_RX_URBS; i++) {
 334                 struct urb *urb = NULL;
 335                 u8 *buf = NULL;
 336                 dma_addr_t buf_dma;
 337
 338                 urb = usb_alloc_urb(0, GFP_KERNEL);
 339                 if (!urb) {
 340                         err = -ENOMEM;
 341                         break;
 342                 }
 343
 344                 buf = usb_alloc_coherent(dev->udev, KVASER_USB_RX_BUFFER_SIZE,
 345                                          GFP_KERNEL, &buf_dma);
 346                 if (!buf) {
 347                         dev_warn(&dev->intf->dev,
 348                                  "No memory left for USB buffer\n");
 349                         usb_free_urb(urb);
 350                         err = -ENOMEM;
 351                         break;
 352                 }
 353
 354                 usb_fill_bulk_urb(urb, dev->udev,
 355                                   usb_rcvbulkpipe
 356                                         (dev->udev,
 357                                          dev->bulk_in->bEndpointAddress),
 358                                   buf, KVASER_USB_RX_BUFFER_SIZE,
 359                                   kvaser_usb_read_bulk_callback, dev);
 360                 urb->transfer_dma = buf_dma;
 361                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 362                 usb_anchor_urb(urb, &dev->rx_submitted);
 363
 364                 err = usb_submit_urb(urb, GFP_KERNEL);
 365                 if (err) {
 366                         usb_unanchor_urb(urb);
 367                         usb_free_coherent(dev->udev,
 368                                           KVASER_USB_RX_BUFFER_SIZE, buf,
 369                                           buf_dma);
 370                         usb_free_urb(urb);
 371                         break;
 372                 }
 373
 374                 dev->rxbuf[i] = buf;
 375                 dev->rxbuf_dma[i] = buf_dma;
 376
 377                 usb_free_urb(urb);
 378         }
 379
 380         if (i == 0) {
 381                 dev_warn(&dev->intf->dev, "Cannot setup read URBs, error %d\n",
 382                          err);
 383                 return err;
 384         } else if (i < KVASER_USB_MAX_RX_URBS) {
 385                 dev_warn(&dev->intf->dev, "RX performances may be slow\n");
 386         }
 387
 388         dev->rxinitdone = true;
 389
 390         return 0;
 391 }
 392
 393 static int kvaser_usb_open(struct net_device *netdev)
 394 {
 395         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
 396         struct kvaser_usb *dev = priv->dev;
 397         int err;
 398
 399         err = open_candev(netdev);
 400         if (err)
 401                 return err;
 402
 403         err = kvaser_usb_setup_rx_urbs(dev);
 404         if (err)
 405                 goto error;
 406
 407         err = dev->ops->dev_set_opt_mode(priv);
 408         if (err)
 409                 goto error;
 410
 411         err = dev->ops->dev_start_chip(priv);
 412         if (err) {
 413                 netdev_warn(netdev, "Cannot start device, error %d\n", err);
 414                 goto error;
 415         }
 416
 417         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 418
 419         return 0;
 420
 421 error:
 422         close_candev(netdev);
 423         return err;
 424 }
 425
 426 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
 427 {
 428         int i, max_tx_urbs;
 429
 430         max_tx_urbs = priv->dev->max_tx_urbs;
 431
 432         priv->active_tx_contexts = 0;
 433         for (i = 0; i < max_tx_urbs; i++)
 434                 priv->tx_contexts[i].echo_index = max_tx_urbs;
 435 }
 436
 437 /* This method might sleep. Do not call it in the atomic context
 438  * of URB completions.
 439  */
 440 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
 441 {
 442         usb_kill_anchored_urbs(&priv->tx_submitted);
 443         kvaser_usb_reset_tx_urb_contexts(priv);
 444 }
 445
 446 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
 447 {
 448         int i;
 449
 450         usb_kill_anchored_urbs(&dev->rx_submitted);
 451
 452         for (i = 0; i < KVASER_USB_MAX_RX_URBS; i++)
 453                 usb_free_coherent(dev->udev, KVASER_USB_RX_BUFFER_SIZE,
 454                                   dev->rxbuf[i], dev->rxbuf_dma[i]);
 455
 456         for (i = 0; i < dev->nchannels; i++) {
 457                 struct kvaser_usb_net_priv *priv = dev->nets[i];
 458
 459                 if (priv)
 460                         kvaser_usb_unlink_tx_urbs(priv);
 461         }
 462 }
 463
 464 static int kvaser_usb_close(struct net_device *netdev)
 465 {
 466         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
 467         struct kvaser_usb *dev = priv->dev;
 468         int err;
 469
 470         netif_stop_queue(netdev);
 471
 472         err = dev->ops->dev_flush_queue(priv);
 473         if (err)
 474                 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
 475
 476         if (dev->ops->dev_reset_chip) {
 477                 err = dev->ops->dev_reset_chip(dev, priv->channel);
 478                 if (err)
 479                         netdev_warn(netdev, "Cannot reset card, error %d\n",
 480                                     err);
 481         }
 482
 483         err = dev->ops->dev_stop_chip(priv);
 484         if (err)
 485                 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
 486
 487         /* reset tx contexts */
 488         kvaser_usb_unlink_tx_urbs(priv);
 489
 490         priv->can.state = CAN_STATE_STOPPED;
 491         close_candev(priv->netdev);
 492
 493         return 0;
 494 }
 495
 496 static void kvaser_usb_write_bulk_callback(struct urb *urb)
 497 {
 498         struct kvaser_usb_tx_urb_context *context = urb->context;
 499         struct kvaser_usb_net_priv *priv;
 500         struct net_device *netdev;
 501
 502         if (WARN_ON(!context))
 503                 return;
 504
 505         priv = context->priv;
 506         netdev = priv->netdev;
 507
 508         kfree(urb->transfer_buffer);
 509
 510         if (!netif_device_present(netdev))
 511                 return;
 512
 513         if (urb->status)
 514                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
 515 }
 516
 517 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
 518                                          struct net_device *netdev)
 519 {
 520         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
 521         struct kvaser_usb *dev = priv->dev;
 522         struct net_device_stats *stats = &netdev->stats;
 523         struct kvaser_usb_tx_urb_context *context = NULL;
 524         struct urb *urb;
 525         void *buf;
 526         int cmd_len = 0;
 527         int err, ret = NETDEV_TX_OK;
 528         unsigned int i;
 529         unsigned long flags;
 530
 531         if (can_dropped_invalid_skb(netdev, skb))
 532                 return NETDEV_TX_OK;
 533
 534         urb = usb_alloc_urb(0, GFP_ATOMIC);
 535         if (!urb) {
 536                 stats->tx_dropped++;
 537                 dev_kfree_skb(skb);
 538                 return NETDEV_TX_OK;
 539         }
 540
 541         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 542         for (i = 0; i < dev->max_tx_urbs; i++) {
 543                 if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
 544                         context = &priv->tx_contexts[i];
 545
 546                         context->echo_index = i;
 547                         ++priv->active_tx_contexts;
 548                         if (priv->active_tx_contexts >= (int)dev->max_tx_urbs)
 549                                 netif_stop_queue(netdev);
 550
 551                         break;
 552                 }
 553         }
 554         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 555
 556         /* This should never happen; it implies a flow control bug */
 557         if (!context) {
 558                 netdev_warn(netdev, "cannot find free context\n");
 559
 560                 ret = NETDEV_TX_BUSY;
 561                 goto freeurb;
 562         }
 563
 564         buf = dev->ops->dev_frame_to_cmd(priv, skb, &context->dlc, &cmd_len,
 565                                          context->echo_index);
 566         if (!buf) {
 567                 stats->tx_dropped++;
 568                 dev_kfree_skb(skb);
 569                 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 570
 571                 context->echo_index = dev->max_tx_urbs;
 572                 --priv->active_tx_contexts;
 573                 netif_wake_queue(netdev);
 574
 575                 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 576                 goto freeurb;
 577         }
 578
 579         context->priv = priv;
 580
 581         can_put_echo_skb(skb, netdev, context->echo_index, 0);
 582
 583         usb_fill_bulk_urb(urb, dev->udev,
 584                           usb_sndbulkpipe(dev->udev,
 585                                           dev->bulk_out->bEndpointAddress),
 586                           buf, cmd_len, kvaser_usb_write_bulk_callback,
 587                           context);
 588         usb_anchor_urb(urb, &priv->tx_submitted);
 589
 590         err = usb_submit_urb(urb, GFP_ATOMIC);
 591         if (unlikely(err)) {
 592                 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 593
 594                 can_free_echo_skb(netdev, context->echo_index);
 595                 context->echo_index = dev->max_tx_urbs;
 596                 --priv->active_tx_contexts;
 597                 netif_wake_queue(netdev);
 598
 599                 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 600
 601                 usb_unanchor_urb(urb);
 602                 kfree(buf);
 603
 604                 stats->tx_dropped++;
 605
 606                 if (err == -ENODEV)
 607                         netif_device_detach(netdev);
 608                 else
 609                         netdev_warn(netdev, "Failed tx_urb %d\n", err);
 610
 611                 goto freeurb;
 612         }
 613
 614         ret = NETDEV_TX_OK;
 615
 616 freeurb:
 617         usb_free_urb(urb);
 618         return ret;
 619 }
 620
 621 static const struct net_device_ops kvaser_usb_netdev_ops = {
 622         .ndo_open = kvaser_usb_open,
 623         .ndo_stop = kvaser_usb_close,
 624         .ndo_start_xmit = kvaser_usb_start_xmit,
 625         .ndo_change_mtu = can_change_mtu,
 626 };
 627
 628 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
 629 {
 630         int i;
 631
 632         for (i = 0; i < dev->nchannels; i++) {
 633                 if (!dev->nets[i])
 634                         continue;
 635
 636                 unregister_candev(dev->nets[i]->netdev);
 637         }
 638
 639         kvaser_usb_unlink_all_urbs(dev);
 640
 641         for (i = 0; i < dev->nchannels; i++) {
 642                 if (!dev->nets[i])
 643                         continue;
 644
 645                 free_candev(dev->nets[i]->netdev);
 646         }
 647 }
 648
 649 static int kvaser_usb_init_one(struct kvaser_usb *dev,
 650                                const struct usb_device_id *id, int channel)
 651 {
 652         struct net_device *netdev;
 653         struct kvaser_usb_net_priv *priv;
 654         int err;
 655
 656         if (dev->ops->dev_reset_chip) {
 657                 err = dev->ops->dev_reset_chip(dev, channel);
 658                 if (err)
 659                         return err;
 660         }
 661
 662         netdev = alloc_candev(struct_size(priv, tx_contexts, dev->max_tx_urbs),
 663                               dev->max_tx_urbs);
 664         if (!netdev) {
 665                 dev_err(&dev->intf->dev, "Cannot alloc candev\n");
 666                 return -ENOMEM;
 667         }
 668
 669         priv = netdev_priv(netdev);
 670
 671         init_usb_anchor(&priv->tx_submitted);
 672         init_completion(&priv->start_comp);
 673         init_completion(&priv->stop_comp);
 674         priv->can.ctrlmode_supported = 0;
 675
 676         priv->dev = dev;
 677         priv->netdev = netdev;
 678         priv->channel = channel;
 679
 680         spin_lock_init(&priv->tx_contexts_lock);
 681         kvaser_usb_reset_tx_urb_contexts(priv);
 682
 683         priv->can.state = CAN_STATE_STOPPED;
 684         priv->can.clock.freq = dev->cfg->clock.freq;
 685         priv->can.bittiming_const = dev->cfg->bittiming_const;
 686         priv->can.do_set_bittiming = dev->ops->dev_set_bittiming;
 687         priv->can.do_set_mode = dev->ops->dev_set_mode;
 688         if ((id->driver_info & KVASER_USB_HAS_TXRX_ERRORS) ||
 689             (priv->dev->card_data.capabilities & KVASER_USB_CAP_BERR_CAP))
 690                 priv->can.do_get_berr_counter = dev->ops->dev_get_berr_counter;
 691         if (id->driver_info & KVASER_USB_HAS_SILENT_MODE)
 692                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
 693
 694         priv->can.ctrlmode_supported |= dev->card_data.ctrlmode_supported;
 695
 696         if (priv->can.ctrlmode_supported & CAN_CTRLMODE_FD) {
 697                 priv->can.data_bittiming_const = dev->cfg->data_bittiming_const;
 698                 priv->can.do_set_data_bittiming =
 699                                         dev->ops->dev_set_data_bittiming;
 700         }
 701
 702         netdev->flags |= IFF_ECHO;
 703
 704         netdev->netdev_ops = &kvaser_usb_netdev_ops;
 705
 706         SET_NETDEV_DEV(netdev, &dev->intf->dev);
 707         netdev->dev_id = channel;
 708
 709         dev->nets[channel] = priv;
 710
 711         err = register_candev(netdev);
 712         if (err) {
 713                 dev_err(&dev->intf->dev, "Failed to register CAN device\n");
 714                 free_candev(netdev);
 715                 dev->nets[channel] = NULL;
 716                 return err;
 717         }
 718
 719         netdev_dbg(netdev, "device registered\n");
 720
 721         return 0;
 722 }
 723
 724 static int kvaser_usb_probe(struct usb_interface *intf,
 725                             const struct usb_device_id *id)
 726 {
 727         struct kvaser_usb *dev;
 728         int err;
 729         int i;
 730
 731         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
 732         if (!dev)
 733                 return -ENOMEM;
 734
 735         if (kvaser_is_leaf(id)) {
 736                 dev->card_data.leaf.family = KVASER_LEAF;
 737                 dev->ops = &kvaser_usb_leaf_dev_ops;
 738         } else if (kvaser_is_usbcan(id)) {
 739                 dev->card_data.leaf.family = KVASER_USBCAN;
 740                 dev->ops = &kvaser_usb_leaf_dev_ops;
 741         } else if (kvaser_is_hydra(id)) {
 742                 dev->ops = &kvaser_usb_hydra_dev_ops;
 743         } else {
 744                 dev_err(&intf->dev,
 745                         "Product ID (%d) is not a supported Kvaser USB device\n",
 746                         id->idProduct);
 747                 return -ENODEV;
 748         }
 749
 750         dev->intf = intf;
 751
 752         err = dev->ops->dev_setup_endpoints(dev);
 753         if (err) {
 754                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
 755                 return err;
 756         }
 757
 758         dev->udev = interface_to_usbdev(intf);
 759
 760         init_usb_anchor(&dev->rx_submitted);
 761
 762         usb_set_intfdata(intf, dev);
 763
 764         dev->card_data.ctrlmode_supported = 0;
 765         dev->card_data.capabilities = 0;
 766         err = dev->ops->dev_init_card(dev);
 767         if (err) {
 768                 dev_err(&intf->dev,
 769                         "Failed to initialize card, error %d\n", err);
 770                 return err;
 771         }
 772
 773         err = dev->ops->dev_get_software_info(dev);
 774         if (err) {
 775                 dev_err(&intf->dev,
 776                         "Cannot get software info, error %d\n", err);
 777                 return err;
 778         }
 779
 780         if (dev->ops->dev_get_software_details) {
 781                 err = dev->ops->dev_get_software_details(dev);
 782                 if (err) {
 783                         dev_err(&intf->dev,
 784                                 "Cannot get software details, error %d\n", err);
 785                         return err;
 786                 }
 787         }
 788
 789         if (WARN_ON(!dev->cfg))
 790                 return -ENODEV;
 791
 792         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
 793                 ((dev->fw_version >> 24) & 0xff),
 794                 ((dev->fw_version >> 16) & 0xff),
 795                 (dev->fw_version & 0xffff));
 796
 797         dev_dbg(&intf->dev, "Max outstanding tx = %d URBs\n", dev->max_tx_urbs);
 798
 799         err = dev->ops->dev_get_card_info(dev);
 800         if (err) {
 801                 dev_err(&intf->dev, "Cannot get card info, error %d\n", err);
 802                 return err;
 803         }
 804
 805         if (dev->ops->dev_get_capabilities) {
 806                 err = dev->ops->dev_get_capabilities(dev);
 807                 if (err) {
 808                         dev_err(&intf->dev,
 809                                 "Cannot get capabilities, error %d\n", err);
 810                         kvaser_usb_remove_interfaces(dev);
 811                         return err;
 812                 }
 813         }
 814
 815         for (i = 0; i < dev->nchannels; i++) {
 816                 err = kvaser_usb_init_one(dev, id, i);
 817                 if (err) {
 818                         kvaser_usb_remove_interfaces(dev);
 819                         return err;
 820                 }
 821         }
 822
 823         return 0;
 824 }
 825
 826 static void kvaser_usb_disconnect(struct usb_interface *intf)
 827 {
 828         struct kvaser_usb *dev = usb_get_intfdata(intf);
 829
 830         usb_set_intfdata(intf, NULL);
 831
 832         if (!dev)
 833                 return;
 834
 835         kvaser_usb_remove_interfaces(dev);
 836 }
 837
 838 static struct usb_driver kvaser_usb_driver = {
 839         .name = "kvaser_usb",
 840         .probe = kvaser_usb_probe,
 841         .disconnect = kvaser_usb_disconnect,
 842         .id_table = kvaser_usb_table,
 843 };
 844
 845 module_usb_driver(kvaser_usb_driver);
 846
 847 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
 848 MODULE_AUTHOR("Kvaser AB <support@kvaser.com>");
 849 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
 850 MODULE_LICENSE("GPL v2");