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_2CANLIN_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_2CANLIN_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_USBCAN_PRO_4HS_PRODUCT_ID           276
  90 #define USB_HYBRID_CANLIN_PRODUCT_ID            277
  91 #define USB_HYBRID_PRO_CANLIN_PRODUCT_ID        278
  92 #define USB_HYDRA_PRODUCT_ID_END \
  93         USB_HYBRID_PRO_CANLIN_PRODUCT_ID
  94
  95 static inline bool kvaser_is_leaf(const struct usb_device_id *id)
  96 {
  97         return (id->idProduct >= USB_LEAF_DEVEL_PRODUCT_ID &&
  98                 id->idProduct <= USB_CAN_R_PRODUCT_ID) ||
  99                 (id->idProduct >= USB_LEAF_LITE_V2_PRODUCT_ID &&
 100                  id->idProduct <= USB_LEAF_PRODUCT_ID_END);
 101 }
 102
 103 static inline bool kvaser_is_usbcan(const struct usb_device_id *id)
 104 {
 105         return id->idProduct >= USB_USBCAN_REVB_PRODUCT_ID &&
 106                id->idProduct <= USB_MEMORATOR_PRODUCT_ID;
 107 }
 108
 109 static inline bool kvaser_is_hydra(const struct usb_device_id *id)
 110 {
 111         return id->idProduct >= USB_BLACKBIRD_V2_PRODUCT_ID &&
 112                id->idProduct <= USB_HYDRA_PRODUCT_ID_END;
 113 }
 114
 115 static const struct usb_device_id kvaser_usb_table[] = {
 116         /* Leaf USB product IDs */
 117         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
 118         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
 119         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
 120                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 121                                KVASER_USB_HAS_SILENT_MODE },
 122         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_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_LS_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_SWC_PRODUCT_ID),
 129                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 130                                KVASER_USB_HAS_SILENT_MODE },
 131         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_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_LS_PRODUCT_ID),
 135                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 136                                KVASER_USB_HAS_SILENT_MODE },
 137         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
 138                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 139                                KVASER_USB_HAS_SILENT_MODE },
 140         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
 141                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 142                                KVASER_USB_HAS_SILENT_MODE },
 143         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
 144                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 145                                KVASER_USB_HAS_SILENT_MODE },
 146         { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
 147                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 148         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
 149         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
 150                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS |
 151                                KVASER_USB_HAS_SILENT_MODE },
 152         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
 153                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 154         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
 155                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 156         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
 157                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 158         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
 159                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 160         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
 161                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 162         { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
 163                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 164         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
 165         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
 166         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID) },
 167         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_2HS_PRODUCT_ID) },
 168         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_2HS_PRODUCT_ID) },
 169         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_R_V2_PRODUCT_ID) },
 170         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_R_V2_PRODUCT_ID) },
 171         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM2_PRODUCT_ID) },
 172
 173         /* USBCANII USB product IDs */
 174         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
 175                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 176         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
 177                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 178         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
 179                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 180         { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
 181                 .driver_info = KVASER_USB_HAS_TXRX_ERRORS },
 182
 183         /* Minihydra USB product IDs */
 184         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_V2_PRODUCT_ID) },
 185         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_PRO_5HS_PRODUCT_ID) },
 186         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_5HS_PRODUCT_ID) },
 187         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_4HS_PRODUCT_ID) },
 188         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_HS_V2_PRODUCT_ID) },
 189         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_2HS_V2_PRODUCT_ID) },
 190         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_2HS_PRODUCT_ID) },
 191         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_PRO_2HS_V2_PRODUCT_ID) },
 192         { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_2CANLIN_PRODUCT_ID) },
 193         { USB_DEVICE(KVASER_VENDOR_ID, USB_ATI_USBCAN_PRO_2HS_V2_PRODUCT_ID) },
 194         { USB_DEVICE(KVASER_VENDOR_ID, USB_ATI_MEMO_PRO_2HS_V2_PRODUCT_ID) },
 195         { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_PRO_2CANLIN_PRODUCT_ID) },
 196         { USB_DEVICE(KVASER_VENDOR_ID, USB_U100_PRODUCT_ID) },
 197         { USB_DEVICE(KVASER_VENDOR_ID, USB_U100P_PRODUCT_ID) },
 198         { USB_DEVICE(KVASER_VENDOR_ID, USB_U100S_PRODUCT_ID) },
 199         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_4HS_PRODUCT_ID) },
 200         { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_CANLIN_PRODUCT_ID) },
 201         { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_PRO_CANLIN_PRODUCT_ID) },
 202         { }
 203 };
 204 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
 205
 206 int kvaser_usb_send_cmd(const struct kvaser_usb *dev, void *cmd, int len)
 207 {
 208         return usb_bulk_msg(dev->udev,
 209                             usb_sndbulkpipe(dev->udev,
 210                                             dev->bulk_out->bEndpointAddress),
 211                             cmd, len, NULL, KVASER_USB_TIMEOUT);
 212 }
 213
 214 int kvaser_usb_recv_cmd(const struct kvaser_usb *dev, void *cmd, int len,
 215                         int *actual_len)
 216 {
 217         return usb_bulk_msg(dev->udev,
 218                             usb_rcvbulkpipe(dev->udev,
 219                                             dev->bulk_in->bEndpointAddress),
 220                             cmd, len, actual_len, KVASER_USB_TIMEOUT);
 221 }
 222
 223 static void kvaser_usb_send_cmd_callback(struct urb *urb)
 224 {
 225         struct net_device *netdev = urb->context;
 226
 227         kfree(urb->transfer_buffer);
 228
 229         if (urb->status)
 230                 netdev_warn(netdev, "urb status received: %d\n", urb->status);
 231 }
 232
 233 int kvaser_usb_send_cmd_async(struct kvaser_usb_net_priv *priv, void *cmd,
 234                               int len)
 235 {
 236         struct kvaser_usb *dev = priv->dev;
 237         struct net_device *netdev = priv->netdev;
 238         struct urb *urb;
 239         int err;
 240
 241         urb = usb_alloc_urb(0, GFP_ATOMIC);
 242         if (!urb)
 243                 return -ENOMEM;
 244
 245         usb_fill_bulk_urb(urb, dev->udev,
 246                           usb_sndbulkpipe(dev->udev,
 247                                           dev->bulk_out->bEndpointAddress),
 248                           cmd, len, kvaser_usb_send_cmd_callback, netdev);
 249         usb_anchor_urb(urb, &priv->tx_submitted);
 250
 251         err = usb_submit_urb(urb, GFP_ATOMIC);
 252         if (err) {
 253                 netdev_err(netdev, "Error transmitting URB\n");
 254                 usb_unanchor_urb(urb);
 255         }
 256         usb_free_urb(urb);
 257
 258         return 0;
 259 }
 260
 261 int kvaser_usb_can_rx_over_error(struct net_device *netdev)
 262 {
 263         struct net_device_stats *stats = &netdev->stats;
 264         struct can_frame *cf;
 265         struct sk_buff *skb;
 266
 267         stats->rx_over_errors++;
 268         stats->rx_errors++;
 269
 270         skb = alloc_can_err_skb(netdev, &cf);
 271         if (!skb) {
 272                 stats->rx_dropped++;
 273                 netdev_warn(netdev, "No memory left for err_skb\n");
 274                 return -ENOMEM;
 275         }
 276
 277         cf->can_id |= CAN_ERR_CRTL;
 278         cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 279
 280         netif_rx(skb);
 281
 282         return 0;
 283 }
 284
 285 static void kvaser_usb_read_bulk_callback(struct urb *urb)
 286 {
 287         struct kvaser_usb *dev = urb->context;
 288         int err;
 289         unsigned int i;
 290
 291         switch (urb->status) {
 292         case 0:
 293                 break;
 294         case -ENOENT:
 295         case -EPIPE:
 296         case -EPROTO:
 297         case -ESHUTDOWN:
 298                 return;
 299         default:
 300                 dev_info(&dev->intf->dev, "Rx URB aborted (%d)\n", urb->status);
 301                 goto resubmit_urb;
 302         }
 303
 304         dev->ops->dev_read_bulk_callback(dev, urb->transfer_buffer,
 305                                          urb->actual_length);
 306
 307 resubmit_urb:
 308         usb_fill_bulk_urb(urb, dev->udev,
 309                           usb_rcvbulkpipe(dev->udev,
 310                                           dev->bulk_in->bEndpointAddress),
 311                           urb->transfer_buffer, KVASER_USB_RX_BUFFER_SIZE,
 312                           kvaser_usb_read_bulk_callback, dev);
 313
 314         err = usb_submit_urb(urb, GFP_ATOMIC);
 315         if (err == -ENODEV) {
 316                 for (i = 0; i < dev->nchannels; i++) {
 317                         if (!dev->nets[i])
 318                                 continue;
 319
 320                         netif_device_detach(dev->nets[i]->netdev);
 321                 }
 322         } else if (err) {
 323                 dev_err(&dev->intf->dev,
 324                         "Failed resubmitting read bulk urb: %d\n", err);
 325         }
 326 }
 327
 328 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
 329 {
 330         int i, err = 0;
 331
 332         if (dev->rxinitdone)
 333                 return 0;
 334
 335         for (i = 0; i < KVASER_USB_MAX_RX_URBS; i++) {
 336                 struct urb *urb = NULL;
 337                 u8 *buf = NULL;
 338                 dma_addr_t buf_dma;
 339
 340                 urb = usb_alloc_urb(0, GFP_KERNEL);
 341                 if (!urb) {
 342                         err = -ENOMEM;
 343                         break;
 344                 }
 345
 346                 buf = usb_alloc_coherent(dev->udev, KVASER_USB_RX_BUFFER_SIZE,
 347                                          GFP_KERNEL, &buf_dma);
 348                 if (!buf) {
 349                         dev_warn(&dev->intf->dev,
 350                                  "No memory left for USB buffer\n");
 351                         usb_free_urb(urb);
 352                         err = -ENOMEM;
 353                         break;
 354                 }
 355
 356                 usb_fill_bulk_urb(urb, dev->udev,
 357                                   usb_rcvbulkpipe
 358                                         (dev->udev,
 359                                          dev->bulk_in->bEndpointAddress),
 360                                   buf, KVASER_USB_RX_BUFFER_SIZE,
 361                                   kvaser_usb_read_bulk_callback, dev);
 362                 urb->transfer_dma = buf_dma;
 363                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 364                 usb_anchor_urb(urb, &dev->rx_submitted);
 365
 366                 err = usb_submit_urb(urb, GFP_KERNEL);
 367                 if (err) {
 368                         usb_unanchor_urb(urb);
 369                         usb_free_coherent(dev->udev,
 370                                           KVASER_USB_RX_BUFFER_SIZE, buf,
 371                                           buf_dma);
 372                         usb_free_urb(urb);
 373                         break;
 374                 }
 375
 376                 dev->rxbuf[i] = buf;
 377                 dev->rxbuf_dma[i] = buf_dma;
 378
 379                 usb_free_urb(urb);
 380         }
 381
 382         if (i == 0) {
 383                 dev_warn(&dev->intf->dev, "Cannot setup read URBs, error %d\n",
 384                          err);
 385                 return err;
 386         } else if (i < KVASER_USB_MAX_RX_URBS) {
 387                 dev_warn(&dev->intf->dev, "RX performances may be slow\n");
 388         }
 389
 390         dev->rxinitdone = true;
 391
 392         return 0;
 393 }
 394
 395 static int kvaser_usb_open(struct net_device *netdev)
 396 {
 397         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
 398         struct kvaser_usb *dev = priv->dev;
 399         int err;
 400
 401         err = open_candev(netdev);
 402         if (err)
 403                 return err;
 404
 405         err = kvaser_usb_setup_rx_urbs(dev);
 406         if (err)
 407                 goto error;
 408
 409         err = dev->ops->dev_set_opt_mode(priv);
 410         if (err)
 411                 goto error;
 412
 413         err = dev->ops->dev_start_chip(priv);
 414         if (err) {
 415                 netdev_warn(netdev, "Cannot start device, error %d\n", err);
 416                 goto error;
 417         }
 418
 419         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 420
 421         return 0;
 422
 423 error:
 424         close_candev(netdev);
 425         return err;
 426 }
 427
 428 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
 429 {
 430         int i, max_tx_urbs;
 431
 432         max_tx_urbs = priv->dev->max_tx_urbs;
 433
 434         priv->active_tx_contexts = 0;
 435         for (i = 0; i < max_tx_urbs; i++)
 436                 priv->tx_contexts[i].echo_index = max_tx_urbs;
 437 }
 438
 439 /* This method might sleep. Do not call it in the atomic context
 440  * of URB completions.
 441  */
 442 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
 443 {
 444         usb_kill_anchored_urbs(&priv->tx_submitted);
 445         kvaser_usb_reset_tx_urb_contexts(priv);
 446 }
 447
 448 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
 449 {
 450         int i;
 451
 452         usb_kill_anchored_urbs(&dev->rx_submitted);
 453
 454         for (i = 0; i < KVASER_USB_MAX_RX_URBS; i++)
 455                 usb_free_coherent(dev->udev, KVASER_USB_RX_BUFFER_SIZE,
 456                                   dev->rxbuf[i], dev->rxbuf_dma[i]);
 457
 458         for (i = 0; i < dev->nchannels; i++) {
 459                 struct kvaser_usb_net_priv *priv = dev->nets[i];
 460
 461                 if (priv)
 462                         kvaser_usb_unlink_tx_urbs(priv);
 463         }
 464 }
 465
 466 static int kvaser_usb_close(struct net_device *netdev)
 467 {
 468         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
 469         struct kvaser_usb *dev = priv->dev;
 470         int err;
 471
 472         netif_stop_queue(netdev);
 473
 474         err = dev->ops->dev_flush_queue(priv);
 475         if (err)
 476                 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
 477
 478         if (dev->ops->dev_reset_chip) {
 479                 err = dev->ops->dev_reset_chip(dev, priv->channel);
 480                 if (err)
 481                         netdev_warn(netdev, "Cannot reset card, error %d\n",
 482                                     err);
 483         }
 484
 485         err = dev->ops->dev_stop_chip(priv);
 486         if (err)
 487                 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
 488
 489         /* reset tx contexts */
 490         kvaser_usb_unlink_tx_urbs(priv);
 491
 492         priv->can.state = CAN_STATE_STOPPED;
 493         close_candev(priv->netdev);
 494
 495         return 0;
 496 }
 497
 498 static void kvaser_usb_write_bulk_callback(struct urb *urb)
 499 {
 500         struct kvaser_usb_tx_urb_context *context = urb->context;
 501         struct kvaser_usb_net_priv *priv;
 502         struct net_device *netdev;
 503
 504         if (WARN_ON(!context))
 505                 return;
 506
 507         priv = context->priv;
 508         netdev = priv->netdev;
 509
 510         kfree(urb->transfer_buffer);
 511
 512         if (!netif_device_present(netdev))
 513                 return;
 514
 515         if (urb->status)
 516                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
 517 }
 518
 519 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
 520                                          struct net_device *netdev)
 521 {
 522         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
 523         struct kvaser_usb *dev = priv->dev;
 524         struct net_device_stats *stats = &netdev->stats;
 525         struct kvaser_usb_tx_urb_context *context = NULL;
 526         struct urb *urb;
 527         void *buf;
 528         int cmd_len = 0;
 529         int err, ret = NETDEV_TX_OK;
 530         unsigned int i;
 531         unsigned long flags;
 532
 533         if (can_dropped_invalid_skb(netdev, skb))
 534                 return NETDEV_TX_OK;
 535
 536         urb = usb_alloc_urb(0, GFP_ATOMIC);
 537         if (!urb) {
 538                 stats->tx_dropped++;
 539                 dev_kfree_skb(skb);
 540                 return NETDEV_TX_OK;
 541         }
 542
 543         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 544         for (i = 0; i < dev->max_tx_urbs; i++) {
 545                 if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
 546                         context = &priv->tx_contexts[i];
 547
 548                         context->echo_index = i;
 549                         ++priv->active_tx_contexts;
 550                         if (priv->active_tx_contexts >= (int)dev->max_tx_urbs)
 551                                 netif_stop_queue(netdev);
 552
 553                         break;
 554                 }
 555         }
 556         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 557
 558         /* This should never happen; it implies a flow control bug */
 559         if (!context) {
 560                 netdev_warn(netdev, "cannot find free context\n");
 561
 562                 ret = NETDEV_TX_BUSY;
 563                 goto freeurb;
 564         }
 565
 566         buf = dev->ops->dev_frame_to_cmd(priv, skb, &cmd_len,
 567                                          context->echo_index);
 568         if (!buf) {
 569                 stats->tx_dropped++;
 570                 dev_kfree_skb(skb);
 571                 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 572
 573                 context->echo_index = dev->max_tx_urbs;
 574                 --priv->active_tx_contexts;
 575                 netif_wake_queue(netdev);
 576
 577                 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 578                 goto freeurb;
 579         }
 580
 581         context->priv = priv;
 582
 583         can_put_echo_skb(skb, netdev, context->echo_index, 0);
 584
 585         usb_fill_bulk_urb(urb, dev->udev,
 586                           usb_sndbulkpipe(dev->udev,
 587                                           dev->bulk_out->bEndpointAddress),
 588                           buf, cmd_len, kvaser_usb_write_bulk_callback,
 589                           context);
 590         usb_anchor_urb(urb, &priv->tx_submitted);
 591
 592         err = usb_submit_urb(urb, GFP_ATOMIC);
 593         if (unlikely(err)) {
 594                 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 595
 596                 can_free_echo_skb(netdev, context->echo_index, NULL);
 597                 context->echo_index = dev->max_tx_urbs;
 598                 --priv->active_tx_contexts;
 599                 netif_wake_queue(netdev);
 600
 601                 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 602
 603                 usb_unanchor_urb(urb);
 604                 kfree(buf);
 605
 606                 stats->tx_dropped++;
 607
 608                 if (err == -ENODEV)
 609                         netif_device_detach(netdev);
 610                 else
 611                         netdev_warn(netdev, "Failed tx_urb %d\n", err);
 612
 613                 goto freeurb;
 614         }
 615
 616         ret = NETDEV_TX_OK;
 617
 618 freeurb:
 619         usb_free_urb(urb);
 620         return ret;
 621 }
 622
 623 static const struct net_device_ops kvaser_usb_netdev_ops = {
 624         .ndo_open = kvaser_usb_open,
 625         .ndo_stop = kvaser_usb_close,
 626         .ndo_start_xmit = kvaser_usb_start_xmit,
 627         .ndo_change_mtu = can_change_mtu,
 628 };
 629
 630 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
 631 {
 632         int i;
 633
 634         for (i = 0; i < dev->nchannels; i++) {
 635                 if (!dev->nets[i])
 636                         continue;
 637
 638                 unregister_candev(dev->nets[i]->netdev);
 639         }
 640
 641         kvaser_usb_unlink_all_urbs(dev);
 642
 643         for (i = 0; i < dev->nchannels; i++) {
 644                 if (!dev->nets[i])
 645                         continue;
 646
 647                 free_candev(dev->nets[i]->netdev);
 648         }
 649 }
 650
 651 static int kvaser_usb_init_one(struct kvaser_usb *dev,
 652                                const struct usb_device_id *id, int channel)
 653 {
 654         struct net_device *netdev;
 655         struct kvaser_usb_net_priv *priv;
 656         int err;
 657
 658         if (dev->ops->dev_reset_chip) {
 659                 err = dev->ops->dev_reset_chip(dev, channel);
 660                 if (err)
 661                         return err;
 662         }
 663
 664         netdev = alloc_candev(struct_size(priv, tx_contexts, dev->max_tx_urbs),
 665                               dev->max_tx_urbs);
 666         if (!netdev) {
 667                 dev_err(&dev->intf->dev, "Cannot alloc candev\n");
 668                 return -ENOMEM;
 669         }
 670
 671         priv = netdev_priv(netdev);
 672
 673         init_usb_anchor(&priv->tx_submitted);
 674         init_completion(&priv->start_comp);
 675         init_completion(&priv->stop_comp);
 676         priv->can.ctrlmode_supported = 0;
 677
 678         priv->dev = dev;
 679         priv->netdev = netdev;
 680         priv->channel = channel;
 681
 682         spin_lock_init(&priv->tx_contexts_lock);
 683         kvaser_usb_reset_tx_urb_contexts(priv);
 684
 685         priv->can.state = CAN_STATE_STOPPED;
 686         priv->can.clock.freq = dev->cfg->clock.freq;
 687         priv->can.bittiming_const = dev->cfg->bittiming_const;
 688         priv->can.do_set_bittiming = dev->ops->dev_set_bittiming;
 689         priv->can.do_set_mode = dev->ops->dev_set_mode;
 690         if ((id->driver_info & KVASER_USB_HAS_TXRX_ERRORS) ||
 691             (priv->dev->card_data.capabilities & KVASER_USB_CAP_BERR_CAP))
 692                 priv->can.do_get_berr_counter = dev->ops->dev_get_berr_counter;
 693         if (id->driver_info & KVASER_USB_HAS_SILENT_MODE)
 694                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
 695
 696         priv->can.ctrlmode_supported |= dev->card_data.ctrlmode_supported;
 697
 698         if (priv->can.ctrlmode_supported & CAN_CTRLMODE_FD) {
 699                 priv->can.data_bittiming_const = dev->cfg->data_bittiming_const;
 700                 priv->can.do_set_data_bittiming =
 701                                         dev->ops->dev_set_data_bittiming;
 702         }
 703
 704         netdev->flags |= IFF_ECHO;
 705
 706         netdev->netdev_ops = &kvaser_usb_netdev_ops;
 707
 708         SET_NETDEV_DEV(netdev, &dev->intf->dev);
 709         netdev->dev_id = channel;
 710
 711         dev->nets[channel] = priv;
 712
 713         err = register_candev(netdev);
 714         if (err) {
 715                 dev_err(&dev->intf->dev, "Failed to register CAN device\n");
 716                 free_candev(netdev);
 717                 dev->nets[channel] = NULL;
 718                 return err;
 719         }
 720
 721         netdev_dbg(netdev, "device registered\n");
 722
 723         return 0;
 724 }
 725
 726 static int kvaser_usb_probe(struct usb_interface *intf,
 727                             const struct usb_device_id *id)
 728 {
 729         struct kvaser_usb *dev;
 730         int err;
 731         int i;
 732
 733         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
 734         if (!dev)
 735                 return -ENOMEM;
 736
 737         if (kvaser_is_leaf(id)) {
 738                 dev->card_data.leaf.family = KVASER_LEAF;
 739                 dev->ops = &kvaser_usb_leaf_dev_ops;
 740         } else if (kvaser_is_usbcan(id)) {
 741                 dev->card_data.leaf.family = KVASER_USBCAN;
 742                 dev->ops = &kvaser_usb_leaf_dev_ops;
 743         } else if (kvaser_is_hydra(id)) {
 744                 dev->ops = &kvaser_usb_hydra_dev_ops;
 745         } else {
 746                 dev_err(&intf->dev,
 747                         "Product ID (%d) is not a supported Kvaser USB device\n",
 748                         id->idProduct);
 749                 return -ENODEV;
 750         }
 751
 752         dev->intf = intf;
 753
 754         err = dev->ops->dev_setup_endpoints(dev);
 755         if (err) {
 756                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
 757                 return err;
 758         }
 759
 760         dev->udev = interface_to_usbdev(intf);
 761
 762         init_usb_anchor(&dev->rx_submitted);
 763
 764         usb_set_intfdata(intf, dev);
 765
 766         dev->card_data.ctrlmode_supported = 0;
 767         dev->card_data.capabilities = 0;
 768         err = dev->ops->dev_init_card(dev);
 769         if (err) {
 770                 dev_err(&intf->dev,
 771                         "Failed to initialize card, error %d\n", err);
 772                 return err;
 773         }
 774
 775         err = dev->ops->dev_get_software_info(dev);
 776         if (err) {
 777                 dev_err(&intf->dev,
 778                         "Cannot get software info, error %d\n", err);
 779                 return err;
 780         }
 781
 782         if (dev->ops->dev_get_software_details) {
 783                 err = dev->ops->dev_get_software_details(dev);
 784                 if (err) {
 785                         dev_err(&intf->dev,
 786                                 "Cannot get software details, error %d\n", err);
 787                         return err;
 788                 }
 789         }
 790
 791         if (WARN_ON(!dev->cfg))
 792                 return -ENODEV;
 793
 794         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
 795                 ((dev->fw_version >> 24) & 0xff),
 796                 ((dev->fw_version >> 16) & 0xff),
 797                 (dev->fw_version & 0xffff));
 798
 799         dev_dbg(&intf->dev, "Max outstanding tx = %d URBs\n", dev->max_tx_urbs);
 800
 801         err = dev->ops->dev_get_card_info(dev);
 802         if (err) {
 803                 dev_err(&intf->dev, "Cannot get card info, error %d\n", err);
 804                 return err;
 805         }
 806
 807         if (dev->ops->dev_get_capabilities) {
 808                 err = dev->ops->dev_get_capabilities(dev);
 809                 if (err) {
 810                         dev_err(&intf->dev,
 811                                 "Cannot get capabilities, error %d\n", err);
 812                         kvaser_usb_remove_interfaces(dev);
 813                         return err;
 814                 }
 815         }
 816
 817         for (i = 0; i < dev->nchannels; i++) {
 818                 err = kvaser_usb_init_one(dev, id, i);
 819                 if (err) {
 820                         kvaser_usb_remove_interfaces(dev);
 821                         return err;
 822                 }
 823         }
 824
 825         return 0;
 826 }
 827
 828 static void kvaser_usb_disconnect(struct usb_interface *intf)
 829 {
 830         struct kvaser_usb *dev = usb_get_intfdata(intf);
 831
 832         usb_set_intfdata(intf, NULL);
 833
 834         if (!dev)
 835                 return;
 836
 837         kvaser_usb_remove_interfaces(dev);
 838 }
 839
 840 static struct usb_driver kvaser_usb_driver = {
 841         .name = "kvaser_usb",
 842         .probe = kvaser_usb_probe,
 843         .disconnect = kvaser_usb_disconnect,
 844         .id_table = kvaser_usb_table,
 845 };
 846
 847 module_usb_driver(kvaser_usb_driver);
 848
 849 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
 850 MODULE_AUTHOR("Kvaser AB <support@kvaser.com>");
 851 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
 852 MODULE_LICENSE("GPL v2");