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

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DEFINITIONS

This source file includes following definitions.
  1. kvaser_is_leaf
  2. kvaser_is_usbcan
  3. kvaser_is_hydra
  4. kvaser_usb_send_cmd
  5. kvaser_usb_recv_cmd
  6. kvaser_usb_send_cmd_callback
  7. kvaser_usb_send_cmd_async
  8. kvaser_usb_can_rx_over_error
  9. kvaser_usb_read_bulk_callback
  10. kvaser_usb_setup_rx_urbs
  11. kvaser_usb_open
  12. kvaser_usb_reset_tx_urb_contexts
  13. kvaser_usb_unlink_tx_urbs
  14. kvaser_usb_unlink_all_urbs
  15. kvaser_usb_close
  16. kvaser_usb_write_bulk_callback
  17. kvaser_usb_start_xmit
  18. kvaser_usb_remove_interfaces
  19. kvaser_usb_init_one
  20. kvaser_usb_probe
  21. kvaser_usb_disconnect

   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                         ++priv->active_tx_contexts;
 532                         if (priv->active_tx_contexts >= (int)dev->max_tx_urbs)
 533                                 netif_stop_queue(netdev);
 534 
 535                         break;
 536                 }
 537         }
 538         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 539 
 540         /* This should never happen; it implies a flow control bug */
 541         if (!context) {
 542                 netdev_warn(netdev, "cannot find free context\n");
 543 
 544                 ret = NETDEV_TX_BUSY;
 545                 goto freeurb;
 546         }
 547 
 548         buf = dev->ops->dev_frame_to_cmd(priv, skb, &context->dlc, &cmd_len,
 549                                          context->echo_index);
 550         if (!buf) {
 551                 stats->tx_dropped++;
 552                 dev_kfree_skb(skb);
 553                 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 554 
 555                 context->echo_index = dev->max_tx_urbs;
 556                 --priv->active_tx_contexts;
 557                 netif_wake_queue(netdev);
 558 
 559                 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 560                 goto freeurb;
 561         }
 562 
 563         context->priv = priv;
 564 
 565         can_put_echo_skb(skb, netdev, context->echo_index);
 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(struct_size(priv, tx_contexts, dev->max_tx_urbs),
 647                               dev->max_tx_urbs);
 648         if (!netdev) {
 649                 dev_err(&dev->intf->dev, "Cannot alloc candev\n");
 650                 return -ENOMEM;
 651         }
 652 
 653         priv = netdev_priv(netdev);
 654 
 655         init_usb_anchor(&priv->tx_submitted);
 656         init_completion(&priv->start_comp);
 657         init_completion(&priv->stop_comp);
 658         priv->can.ctrlmode_supported = 0;
 659 
 660         priv->dev = dev;
 661         priv->netdev = netdev;
 662         priv->channel = channel;
 663 
 664         spin_lock_init(&priv->tx_contexts_lock);
 665         kvaser_usb_reset_tx_urb_contexts(priv);
 666 
 667         priv->can.state = CAN_STATE_STOPPED;
 668         priv->can.clock.freq = dev->cfg->clock.freq;
 669         priv->can.bittiming_const = dev->cfg->bittiming_const;
 670         priv->can.do_set_bittiming = dev->ops->dev_set_bittiming;
 671         priv->can.do_set_mode = dev->ops->dev_set_mode;
 672         if ((id->driver_info & KVASER_USB_HAS_TXRX_ERRORS) ||
 673             (priv->dev->card_data.capabilities & KVASER_USB_CAP_BERR_CAP))
 674                 priv->can.do_get_berr_counter = dev->ops->dev_get_berr_counter;
 675         if (id->driver_info & KVASER_USB_HAS_SILENT_MODE)
 676                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
 677 
 678         priv->can.ctrlmode_supported |= dev->card_data.ctrlmode_supported;
 679 
 680         if (priv->can.ctrlmode_supported & CAN_CTRLMODE_FD) {
 681                 priv->can.data_bittiming_const = dev->cfg->data_bittiming_const;
 682                 priv->can.do_set_data_bittiming =
 683                                         dev->ops->dev_set_data_bittiming;
 684         }
 685 
 686         netdev->flags |= IFF_ECHO;
 687 
 688         netdev->netdev_ops = &kvaser_usb_netdev_ops;
 689 
 690         SET_NETDEV_DEV(netdev, &dev->intf->dev);
 691         netdev->dev_id = channel;
 692 
 693         dev->nets[channel] = priv;
 694 
 695         err = register_candev(netdev);
 696         if (err) {
 697                 dev_err(&dev->intf->dev, "Failed to register CAN device\n");
 698                 free_candev(netdev);
 699                 dev->nets[channel] = NULL;
 700                 return err;
 701         }
 702 
 703         netdev_dbg(netdev, "device registered\n");
 704 
 705         return 0;
 706 }
 707 
 708 static int kvaser_usb_probe(struct usb_interface *intf,
 709                             const struct usb_device_id *id)
 710 {
 711         struct kvaser_usb *dev;
 712         int err;
 713         int i;
 714 
 715         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
 716         if (!dev)
 717                 return -ENOMEM;
 718 
 719         if (kvaser_is_leaf(id)) {
 720                 dev->card_data.leaf.family = KVASER_LEAF;
 721                 dev->ops = &kvaser_usb_leaf_dev_ops;
 722         } else if (kvaser_is_usbcan(id)) {
 723                 dev->card_data.leaf.family = KVASER_USBCAN;
 724                 dev->ops = &kvaser_usb_leaf_dev_ops;
 725         } else if (kvaser_is_hydra(id)) {
 726                 dev->ops = &kvaser_usb_hydra_dev_ops;
 727         } else {
 728                 dev_err(&intf->dev,
 729                         "Product ID (%d) is not a supported Kvaser USB device\n",
 730                         id->idProduct);
 731                 return -ENODEV;
 732         }
 733 
 734         dev->intf = intf;
 735 
 736         err = dev->ops->dev_setup_endpoints(dev);
 737         if (err) {
 738                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
 739                 return err;
 740         }
 741 
 742         dev->udev = interface_to_usbdev(intf);
 743 
 744         init_usb_anchor(&dev->rx_submitted);
 745 
 746         usb_set_intfdata(intf, dev);
 747 
 748         dev->card_data.ctrlmode_supported = 0;
 749         dev->card_data.capabilities = 0;
 750         err = dev->ops->dev_init_card(dev);
 751         if (err) {
 752                 dev_err(&intf->dev,
 753                         "Failed to initialize card, error %d\n", err);
 754                 return err;
 755         }
 756 
 757         err = dev->ops->dev_get_software_info(dev);
 758         if (err) {
 759                 dev_err(&intf->dev,
 760                         "Cannot get software info, error %d\n", err);
 761                 return err;
 762         }
 763 
 764         if (dev->ops->dev_get_software_details) {
 765                 err = dev->ops->dev_get_software_details(dev);
 766                 if (err) {
 767                         dev_err(&intf->dev,
 768                                 "Cannot get software details, error %d\n", err);
 769                         return err;
 770                 }
 771         }
 772 
 773         if (WARN_ON(!dev->cfg))
 774                 return -ENODEV;
 775 
 776         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
 777                 ((dev->fw_version >> 24) & 0xff),
 778                 ((dev->fw_version >> 16) & 0xff),
 779                 (dev->fw_version & 0xffff));
 780 
 781         dev_dbg(&intf->dev, "Max outstanding tx = %d URBs\n", dev->max_tx_urbs);
 782 
 783         err = dev->ops->dev_get_card_info(dev);
 784         if (err) {
 785                 dev_err(&intf->dev, "Cannot get card info, error %d\n", err);
 786                 return err;
 787         }
 788 
 789         if (dev->ops->dev_get_capabilities) {
 790                 err = dev->ops->dev_get_capabilities(dev);
 791                 if (err) {
 792                         dev_err(&intf->dev,
 793                                 "Cannot get capabilities, error %d\n", err);
 794                         kvaser_usb_remove_interfaces(dev);
 795                         return err;
 796                 }
 797         }
 798 
 799         for (i = 0; i < dev->nchannels; i++) {
 800                 err = kvaser_usb_init_one(dev, id, i);
 801                 if (err) {
 802                         kvaser_usb_remove_interfaces(dev);
 803                         return err;
 804                 }
 805         }
 806 
 807         return 0;
 808 }
 809 
 810 static void kvaser_usb_disconnect(struct usb_interface *intf)
 811 {
 812         struct kvaser_usb *dev = usb_get_intfdata(intf);
 813 
 814         usb_set_intfdata(intf, NULL);
 815 
 816         if (!dev)
 817                 return;
 818 
 819         kvaser_usb_remove_interfaces(dev);
 820 }
 821 
 822 static struct usb_driver kvaser_usb_driver = {
 823         .name = "kvaser_usb",
 824         .probe = kvaser_usb_probe,
 825         .disconnect = kvaser_usb_disconnect,
 826         .id_table = kvaser_usb_table,
 827 };
 828 
 829 module_usb_driver(kvaser_usb_driver);
 830 
 831 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
 832 MODULE_AUTHOR("Kvaser AB <support@kvaser.com>");
 833 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
 834 MODULE_LICENSE("GPL v2");

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