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