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
  65 /* Kvaser USBCan-II devices product ids */
  66 #define USB_USBCAN_REVB_PRODUCT_ID              2
  67 #define USB_VCI2_PRODUCT_ID                     3
  68 #define USB_USBCAN2_PRODUCT_ID                  4
  69 #define USB_MEMORATOR_PRODUCT_ID                5
  70
  71 /* Kvaser Minihydra USB devices product ids */
  72 #define USB_BLACKBIRD_V2_PRODUCT_ID             258
  73 #define USB_MEMO_PRO_5HS_PRODUCT_ID             260
  74 #define USB_USBCAN_PRO_5HS_PRODUCT_ID           261
  75 #define USB_USBCAN_LIGHT_4HS_PRODUCT_ID         262
  76 #define USB_LEAF_PRO_HS_V2_PRODUCT_ID           263
  77 #define USB_USBCAN_PRO_2HS_V2_PRODUCT_ID        264
  78 #define USB_MEMO_2HS_PRODUCT_ID                 265
  79 #define USB_MEMO_PRO_2HS_V2_PRODUCT_ID          266
  80 #define USB_HYBRID_2CANLIN_PRODUCT_ID           267
  81 #define USB_ATI_USBCAN_PRO_2HS_V2_PRODUCT_ID    268
  82 #define USB_ATI_MEMO_PRO_2HS_V2_PRODUCT_ID      269
  83 #define USB_HYBRID_PRO_2CANLIN_PRODUCT_ID       270
  84 #define USB_U100_PRODUCT_ID                     273
  85 #define USB_U100P_PRODUCT_ID                    274
  86 #define USB_U100S_PRODUCT_ID                    275
  87 #define USB_USBCAN_PRO_4HS_PRODUCT_ID           276
  88 #define USB_HYBRID_CANLIN_PRODUCT_ID            277
  89 #define USB_HYBRID_PRO_CANLIN_PRODUCT_ID        278
  90
  91 static const struct kvaser_usb_driver_info kvaser_usb_driver_info_hydra = {
  92         .quirks = 0,
  93         .ops = &kvaser_usb_hydra_dev_ops,
  94 };
  95
  96 static const struct kvaser_usb_driver_info kvaser_usb_driver_info_usbcan = {
  97         .quirks = KVASER_USB_QUIRK_HAS_TXRX_ERRORS |
  98                   KVASER_USB_QUIRK_HAS_SILENT_MODE,
  99         .family = KVASER_USBCAN,
 100         .ops = &kvaser_usb_leaf_dev_ops,
 101 };
 102
 103 static const struct kvaser_usb_driver_info kvaser_usb_driver_info_leaf = {
 104         .quirks = KVASER_USB_QUIRK_IGNORE_CLK_FREQ,
 105         .family = KVASER_LEAF,
 106         .ops = &kvaser_usb_leaf_dev_ops,
 107 };
 108
 109 static const struct kvaser_usb_driver_info kvaser_usb_driver_info_leaf_err = {
 110         .quirks = KVASER_USB_QUIRK_HAS_TXRX_ERRORS |
 111                   KVASER_USB_QUIRK_IGNORE_CLK_FREQ,
 112         .family = KVASER_LEAF,
 113         .ops = &kvaser_usb_leaf_dev_ops,
 114 };
 115
 116 static const struct kvaser_usb_driver_info kvaser_usb_driver_info_leaf_err_listen = {
 117         .quirks = KVASER_USB_QUIRK_HAS_TXRX_ERRORS |
 118                   KVASER_USB_QUIRK_HAS_SILENT_MODE |
 119                   KVASER_USB_QUIRK_IGNORE_CLK_FREQ,
 120         .family = KVASER_LEAF,
 121         .ops = &kvaser_usb_leaf_dev_ops,
 122 };
 123
 124 static const struct kvaser_usb_driver_info kvaser_usb_driver_info_leafimx = {
 125         .quirks = 0,
 126         .ops = &kvaser_usb_leaf_dev_ops,
 127 };
 128
 129 static const struct usb_device_id kvaser_usb_table[] = {
 130         /* Leaf M32C USB product IDs */
 131         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID),
 132                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf },
 133         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID),
 134                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf },
 135         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
 136                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 137         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
 138                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 139         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
 140                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 141         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
 142                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 143         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
 144                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 145         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
 146                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 147         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
 148                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 149         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
 150                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 151         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
 152                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 153         { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
 154                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
 155         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID),
 156                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf },
 157         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
 158                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 159         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
 160                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
 161         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
 162                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
 163         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
 164                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
 165         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
 166                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
 167         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
 168                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
 169         { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
 170                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
 171
 172         /* Leaf i.MX28 USB product IDs */
 173         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID),
 174                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 175         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID),
 176                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 177         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID),
 178                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 179         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_2HS_PRODUCT_ID),
 180                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 181         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_2HS_PRODUCT_ID),
 182                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 183         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_R_V2_PRODUCT_ID),
 184                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 185         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_R_V2_PRODUCT_ID),
 186                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 187         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM2_PRODUCT_ID),
 188                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 189
 190         /* USBCANII USB product IDs */
 191         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
 192                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_usbcan },
 193         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
 194                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_usbcan },
 195         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
 196                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_usbcan },
 197         { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
 198                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_usbcan },
 199
 200         /* Minihydra USB product IDs */
 201         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_V2_PRODUCT_ID),
 202                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 203         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_PRO_5HS_PRODUCT_ID),
 204                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 205         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_5HS_PRODUCT_ID),
 206                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 207         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_4HS_PRODUCT_ID),
 208                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 209         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_HS_V2_PRODUCT_ID),
 210                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 211         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_2HS_V2_PRODUCT_ID),
 212                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 213         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_2HS_PRODUCT_ID),
 214                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 215         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_PRO_2HS_V2_PRODUCT_ID),
 216                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 217         { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_2CANLIN_PRODUCT_ID),
 218                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 219         { USB_DEVICE(KVASER_VENDOR_ID, USB_ATI_USBCAN_PRO_2HS_V2_PRODUCT_ID),
 220                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 221         { USB_DEVICE(KVASER_VENDOR_ID, USB_ATI_MEMO_PRO_2HS_V2_PRODUCT_ID),
 222                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 223         { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_PRO_2CANLIN_PRODUCT_ID),
 224                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 225         { USB_DEVICE(KVASER_VENDOR_ID, USB_U100_PRODUCT_ID),
 226                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 227         { USB_DEVICE(KVASER_VENDOR_ID, USB_U100P_PRODUCT_ID),
 228                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 229         { USB_DEVICE(KVASER_VENDOR_ID, USB_U100S_PRODUCT_ID),
 230                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 231         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_4HS_PRODUCT_ID),
 232                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 233         { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_CANLIN_PRODUCT_ID),
 234                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 235         { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_PRO_CANLIN_PRODUCT_ID),
 236                 .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 237         { }
 238 };
 239 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
 240
 241 int kvaser_usb_send_cmd(const struct kvaser_usb *dev, void *cmd, int len)
 242 {
 243         return usb_bulk_msg(dev->udev,
 244                             usb_sndbulkpipe(dev->udev,
 245                                             dev->bulk_out->bEndpointAddress),
 246                             cmd, len, NULL, KVASER_USB_TIMEOUT);
 247 }
 248
 249 int kvaser_usb_recv_cmd(const struct kvaser_usb *dev, void *cmd, int len,
 250                         int *actual_len)
 251 {
 252         return usb_bulk_msg(dev->udev,
 253                             usb_rcvbulkpipe(dev->udev,
 254                                             dev->bulk_in->bEndpointAddress),
 255                             cmd, len, actual_len, KVASER_USB_TIMEOUT);
 256 }
 257
 258 static void kvaser_usb_send_cmd_callback(struct urb *urb)
 259 {
 260         struct net_device *netdev = urb->context;
 261
 262         kfree(urb->transfer_buffer);
 263
 264         if (urb->status)
 265                 netdev_warn(netdev, "urb status received: %d\n", urb->status);
 266 }
 267
 268 int kvaser_usb_send_cmd_async(struct kvaser_usb_net_priv *priv, void *cmd,
 269                               int len)
 270 {
 271         struct kvaser_usb *dev = priv->dev;
 272         struct net_device *netdev = priv->netdev;
 273         struct urb *urb;
 274         int err;
 275
 276         urb = usb_alloc_urb(0, GFP_ATOMIC);
 277         if (!urb)
 278                 return -ENOMEM;
 279
 280         usb_fill_bulk_urb(urb, dev->udev,
 281                           usb_sndbulkpipe(dev->udev,
 282                                           dev->bulk_out->bEndpointAddress),
 283                           cmd, len, kvaser_usb_send_cmd_callback, netdev);
 284         usb_anchor_urb(urb, &priv->tx_submitted);
 285
 286         err = usb_submit_urb(urb, GFP_ATOMIC);
 287         if (err) {
 288                 netdev_err(netdev, "Error transmitting URB\n");
 289                 usb_unanchor_urb(urb);
 290         }
 291         usb_free_urb(urb);
 292
 293         return 0;
 294 }
 295
 296 int kvaser_usb_can_rx_over_error(struct net_device *netdev)
 297 {
 298         struct net_device_stats *stats = &netdev->stats;
 299         struct can_frame *cf;
 300         struct sk_buff *skb;
 301
 302         stats->rx_over_errors++;
 303         stats->rx_errors++;
 304
 305         skb = alloc_can_err_skb(netdev, &cf);
 306         if (!skb) {
 307                 stats->rx_dropped++;
 308                 netdev_warn(netdev, "No memory left for err_skb\n");
 309                 return -ENOMEM;
 310         }
 311
 312         cf->can_id |= CAN_ERR_CRTL;
 313         cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 314
 315         netif_rx(skb);
 316
 317         return 0;
 318 }
 319
 320 static void kvaser_usb_read_bulk_callback(struct urb *urb)
 321 {
 322         struct kvaser_usb *dev = urb->context;
 323         const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
 324         int err;
 325         unsigned int i;
 326
 327         switch (urb->status) {
 328         case 0:
 329                 break;
 330         case -ENOENT:
 331         case -EPIPE:
 332         case -EPROTO:
 333         case -ESHUTDOWN:
 334                 return;
 335         default:
 336                 dev_info(&dev->intf->dev, "Rx URB aborted (%d)\n", urb->status);
 337                 goto resubmit_urb;
 338         }
 339
 340         ops->dev_read_bulk_callback(dev, urb->transfer_buffer,
 341                                     urb->actual_length);
 342
 343 resubmit_urb:
 344         usb_fill_bulk_urb(urb, dev->udev,
 345                           usb_rcvbulkpipe(dev->udev,
 346                                           dev->bulk_in->bEndpointAddress),
 347                           urb->transfer_buffer, KVASER_USB_RX_BUFFER_SIZE,
 348                           kvaser_usb_read_bulk_callback, dev);
 349
 350         err = usb_submit_urb(urb, GFP_ATOMIC);
 351         if (err == -ENODEV) {
 352                 for (i = 0; i < dev->nchannels; i++) {
 353                         if (!dev->nets[i])
 354                                 continue;
 355
 356                         netif_device_detach(dev->nets[i]->netdev);
 357                 }
 358         } else if (err) {
 359                 dev_err(&dev->intf->dev,
 360                         "Failed resubmitting read bulk urb: %d\n", err);
 361         }
 362 }
 363
 364 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
 365 {
 366         int i, err = 0;
 367
 368         if (dev->rxinitdone)
 369                 return 0;
 370
 371         for (i = 0; i < KVASER_USB_MAX_RX_URBS; i++) {
 372                 struct urb *urb = NULL;
 373                 u8 *buf = NULL;
 374                 dma_addr_t buf_dma;
 375
 376                 urb = usb_alloc_urb(0, GFP_KERNEL);
 377                 if (!urb) {
 378                         err = -ENOMEM;
 379                         break;
 380                 }
 381
 382                 buf = usb_alloc_coherent(dev->udev, KVASER_USB_RX_BUFFER_SIZE,
 383                                          GFP_KERNEL, &buf_dma);
 384                 if (!buf) {
 385                         dev_warn(&dev->intf->dev,
 386                                  "No memory left for USB buffer\n");
 387                         usb_free_urb(urb);
 388                         err = -ENOMEM;
 389                         break;
 390                 }
 391
 392                 usb_fill_bulk_urb(urb, dev->udev,
 393                                   usb_rcvbulkpipe
 394                                         (dev->udev,
 395                                          dev->bulk_in->bEndpointAddress),
 396                                   buf, KVASER_USB_RX_BUFFER_SIZE,
 397                                   kvaser_usb_read_bulk_callback, dev);
 398                 urb->transfer_dma = buf_dma;
 399                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 400                 usb_anchor_urb(urb, &dev->rx_submitted);
 401
 402                 err = usb_submit_urb(urb, GFP_KERNEL);
 403                 if (err) {
 404                         usb_unanchor_urb(urb);
 405                         usb_free_coherent(dev->udev,
 406                                           KVASER_USB_RX_BUFFER_SIZE, buf,
 407                                           buf_dma);
 408                         usb_free_urb(urb);
 409                         break;
 410                 }
 411
 412                 dev->rxbuf[i] = buf;
 413                 dev->rxbuf_dma[i] = buf_dma;
 414
 415                 usb_free_urb(urb);
 416         }
 417
 418         if (i == 0) {
 419                 dev_warn(&dev->intf->dev, "Cannot setup read URBs, error %d\n",
 420                          err);
 421                 return err;
 422         } else if (i < KVASER_USB_MAX_RX_URBS) {
 423                 dev_warn(&dev->intf->dev, "RX performances may be slow\n");
 424         }
 425
 426         dev->rxinitdone = true;
 427
 428         return 0;
 429 }
 430
 431 static int kvaser_usb_open(struct net_device *netdev)
 432 {
 433         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
 434         struct kvaser_usb *dev = priv->dev;
 435         const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
 436         int err;
 437
 438         err = open_candev(netdev);
 439         if (err)
 440                 return err;
 441
 442         err = kvaser_usb_setup_rx_urbs(dev);
 443         if (err)
 444                 goto error;
 445
 446         err = ops->dev_set_opt_mode(priv);
 447         if (err)
 448                 goto error;
 449
 450         err = ops->dev_start_chip(priv);
 451         if (err) {
 452                 netdev_warn(netdev, "Cannot start device, error %d\n", err);
 453                 goto error;
 454         }
 455
 456         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 457
 458         return 0;
 459
 460 error:
 461         close_candev(netdev);
 462         return err;
 463 }
 464
 465 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
 466 {
 467         int i, max_tx_urbs;
 468
 469         max_tx_urbs = priv->dev->max_tx_urbs;
 470
 471         priv->active_tx_contexts = 0;
 472         for (i = 0; i < max_tx_urbs; i++)
 473                 priv->tx_contexts[i].echo_index = max_tx_urbs;
 474 }
 475
 476 /* This method might sleep. Do not call it in the atomic context
 477  * of URB completions.
 478  */
 479 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
 480 {
 481         usb_kill_anchored_urbs(&priv->tx_submitted);
 482         kvaser_usb_reset_tx_urb_contexts(priv);
 483 }
 484
 485 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
 486 {
 487         int i;
 488
 489         usb_kill_anchored_urbs(&dev->rx_submitted);
 490
 491         for (i = 0; i < KVASER_USB_MAX_RX_URBS; i++)
 492                 usb_free_coherent(dev->udev, KVASER_USB_RX_BUFFER_SIZE,
 493                                   dev->rxbuf[i], dev->rxbuf_dma[i]);
 494
 495         for (i = 0; i < dev->nchannels; i++) {
 496                 struct kvaser_usb_net_priv *priv = dev->nets[i];
 497
 498                 if (priv)
 499                         kvaser_usb_unlink_tx_urbs(priv);
 500         }
 501 }
 502
 503 static int kvaser_usb_close(struct net_device *netdev)
 504 {
 505         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
 506         struct kvaser_usb *dev = priv->dev;
 507         const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
 508         int err;
 509
 510         netif_stop_queue(netdev);
 511
 512         err = ops->dev_flush_queue(priv);
 513         if (err)
 514                 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
 515
 516         if (ops->dev_reset_chip) {
 517                 err = ops->dev_reset_chip(dev, priv->channel);
 518                 if (err)
 519                         netdev_warn(netdev, "Cannot reset card, error %d\n",
 520                                     err);
 521         }
 522
 523         err = ops->dev_stop_chip(priv);
 524         if (err)
 525                 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
 526
 527         /* reset tx contexts */
 528         kvaser_usb_unlink_tx_urbs(priv);
 529
 530         priv->can.state = CAN_STATE_STOPPED;
 531         close_candev(priv->netdev);
 532
 533         return 0;
 534 }
 535
 536 static void kvaser_usb_write_bulk_callback(struct urb *urb)
 537 {
 538         struct kvaser_usb_tx_urb_context *context = urb->context;
 539         struct kvaser_usb_net_priv *priv;
 540         struct net_device *netdev;
 541
 542         if (WARN_ON(!context))
 543                 return;
 544
 545         priv = context->priv;
 546         netdev = priv->netdev;
 547
 548         kfree(urb->transfer_buffer);
 549
 550         if (!netif_device_present(netdev))
 551                 return;
 552
 553         if (urb->status)
 554                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
 555 }
 556
 557 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
 558                                          struct net_device *netdev)
 559 {
 560         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
 561         struct kvaser_usb *dev = priv->dev;
 562         const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
 563         struct net_device_stats *stats = &netdev->stats;
 564         struct kvaser_usb_tx_urb_context *context = NULL;
 565         struct urb *urb;
 566         void *buf;
 567         int cmd_len = 0;
 568         int err, ret = NETDEV_TX_OK;
 569         unsigned int i;
 570         unsigned long flags;
 571
 572         if (can_dropped_invalid_skb(netdev, skb))
 573                 return NETDEV_TX_OK;
 574
 575         urb = usb_alloc_urb(0, GFP_ATOMIC);
 576         if (!urb) {
 577                 stats->tx_dropped++;
 578                 dev_kfree_skb(skb);
 579                 return NETDEV_TX_OK;
 580         }
 581
 582         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 583         for (i = 0; i < dev->max_tx_urbs; i++) {
 584                 if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
 585                         context = &priv->tx_contexts[i];
 586
 587                         context->echo_index = i;
 588                         ++priv->active_tx_contexts;
 589                         if (priv->active_tx_contexts >= (int)dev->max_tx_urbs)
 590                                 netif_stop_queue(netdev);
 591
 592                         break;
 593                 }
 594         }
 595         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 596
 597         /* This should never happen; it implies a flow control bug */
 598         if (!context) {
 599                 netdev_warn(netdev, "cannot find free context\n");
 600
 601                 ret = NETDEV_TX_BUSY;
 602                 goto freeurb;
 603         }
 604
 605         buf = ops->dev_frame_to_cmd(priv, skb, &cmd_len, context->echo_index);
 606         if (!buf) {
 607                 stats->tx_dropped++;
 608                 dev_kfree_skb(skb);
 609                 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 610
 611                 context->echo_index = dev->max_tx_urbs;
 612                 --priv->active_tx_contexts;
 613                 netif_wake_queue(netdev);
 614
 615                 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 616                 goto freeurb;
 617         }
 618
 619         context->priv = priv;
 620
 621         can_put_echo_skb(skb, netdev, context->echo_index, 0);
 622
 623         usb_fill_bulk_urb(urb, dev->udev,
 624                           usb_sndbulkpipe(dev->udev,
 625                                           dev->bulk_out->bEndpointAddress),
 626                           buf, cmd_len, kvaser_usb_write_bulk_callback,
 627                           context);
 628         usb_anchor_urb(urb, &priv->tx_submitted);
 629
 630         err = usb_submit_urb(urb, GFP_ATOMIC);
 631         if (unlikely(err)) {
 632                 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 633
 634                 can_free_echo_skb(netdev, context->echo_index, NULL);
 635                 context->echo_index = dev->max_tx_urbs;
 636                 --priv->active_tx_contexts;
 637                 netif_wake_queue(netdev);
 638
 639                 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 640
 641                 usb_unanchor_urb(urb);
 642                 kfree(buf);
 643
 644                 stats->tx_dropped++;
 645
 646                 if (err == -ENODEV)
 647                         netif_device_detach(netdev);
 648                 else
 649                         netdev_warn(netdev, "Failed tx_urb %d\n", err);
 650
 651                 goto freeurb;
 652         }
 653
 654         ret = NETDEV_TX_OK;
 655
 656 freeurb:
 657         usb_free_urb(urb);
 658         return ret;
 659 }
 660
 661 static const struct net_device_ops kvaser_usb_netdev_ops = {
 662         .ndo_open = kvaser_usb_open,
 663         .ndo_stop = kvaser_usb_close,
 664         .ndo_start_xmit = kvaser_usb_start_xmit,
 665         .ndo_change_mtu = can_change_mtu,
 666 };
 667
 668 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
 669 {
 670         int i;
 671
 672         for (i = 0; i < dev->nchannels; i++) {
 673                 if (!dev->nets[i])
 674                         continue;
 675
 676                 unregister_candev(dev->nets[i]->netdev);
 677         }
 678
 679         kvaser_usb_unlink_all_urbs(dev);
 680
 681         for (i = 0; i < dev->nchannels; i++) {
 682                 if (!dev->nets[i])
 683                         continue;
 684
 685                 free_candev(dev->nets[i]->netdev);
 686         }
 687 }
 688
 689 static int kvaser_usb_init_one(struct kvaser_usb *dev, int channel)
 690 {
 691         struct net_device *netdev;
 692         struct kvaser_usb_net_priv *priv;
 693         const struct kvaser_usb_driver_info *driver_info = dev->driver_info;
 694         const struct kvaser_usb_dev_ops *ops = driver_info->ops;
 695         int err;
 696
 697         if (ops->dev_reset_chip) {
 698                 err = ops->dev_reset_chip(dev, channel);
 699                 if (err)
 700                         return err;
 701         }
 702
 703         netdev = alloc_candev(struct_size(priv, tx_contexts, dev->max_tx_urbs),
 704                               dev->max_tx_urbs);
 705         if (!netdev) {
 706                 dev_err(&dev->intf->dev, "Cannot alloc candev\n");
 707                 return -ENOMEM;
 708         }
 709
 710         priv = netdev_priv(netdev);
 711
 712         init_usb_anchor(&priv->tx_submitted);
 713         init_completion(&priv->start_comp);
 714         init_completion(&priv->stop_comp);
 715         priv->can.ctrlmode_supported = 0;
 716
 717         priv->dev = dev;
 718         priv->netdev = netdev;
 719         priv->channel = channel;
 720
 721         spin_lock_init(&priv->tx_contexts_lock);
 722         kvaser_usb_reset_tx_urb_contexts(priv);
 723
 724         priv->can.state = CAN_STATE_STOPPED;
 725         priv->can.clock.freq = dev->cfg->clock.freq;
 726         priv->can.bittiming_const = dev->cfg->bittiming_const;
 727         priv->can.do_set_bittiming = ops->dev_set_bittiming;
 728         priv->can.do_set_mode = ops->dev_set_mode;
 729         if ((driver_info->quirks & KVASER_USB_QUIRK_HAS_TXRX_ERRORS) ||
 730             (priv->dev->card_data.capabilities & KVASER_USB_CAP_BERR_CAP))
 731                 priv->can.do_get_berr_counter = ops->dev_get_berr_counter;
 732         if (driver_info->quirks & KVASER_USB_QUIRK_HAS_SILENT_MODE)
 733                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
 734
 735         priv->can.ctrlmode_supported |= dev->card_data.ctrlmode_supported;
 736
 737         if (priv->can.ctrlmode_supported & CAN_CTRLMODE_FD) {
 738                 priv->can.data_bittiming_const = dev->cfg->data_bittiming_const;
 739                 priv->can.do_set_data_bittiming = ops->dev_set_data_bittiming;
 740         }
 741
 742         netdev->flags |= IFF_ECHO;
 743
 744         netdev->netdev_ops = &kvaser_usb_netdev_ops;
 745
 746         SET_NETDEV_DEV(netdev, &dev->intf->dev);
 747         netdev->dev_id = channel;
 748
 749         dev->nets[channel] = priv;
 750
 751         err = register_candev(netdev);
 752         if (err) {
 753                 dev_err(&dev->intf->dev, "Failed to register CAN device\n");
 754                 free_candev(netdev);
 755                 dev->nets[channel] = NULL;
 756                 return err;
 757         }
 758
 759         netdev_dbg(netdev, "device registered\n");
 760
 761         return 0;
 762 }
 763
 764 static int kvaser_usb_probe(struct usb_interface *intf,
 765                             const struct usb_device_id *id)
 766 {
 767         struct kvaser_usb *dev;
 768         int err;
 769         int i;
 770         const struct kvaser_usb_driver_info *driver_info;
 771         const struct kvaser_usb_dev_ops *ops;
 772
 773         driver_info = (const struct kvaser_usb_driver_info *)id->driver_info;
 774         if (!driver_info)
 775                 return -ENODEV;
 776
 777         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
 778         if (!dev)
 779                 return -ENOMEM;
 780
 781         dev->intf = intf;
 782         dev->driver_info = driver_info;
 783         ops = driver_info->ops;
 784
 785         err = ops->dev_setup_endpoints(dev);
 786         if (err) {
 787                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
 788                 return err;
 789         }
 790
 791         dev->udev = interface_to_usbdev(intf);
 792
 793         init_usb_anchor(&dev->rx_submitted);
 794
 795         usb_set_intfdata(intf, dev);
 796
 797         dev->card_data.ctrlmode_supported = 0;
 798         dev->card_data.capabilities = 0;
 799         err = ops->dev_init_card(dev);
 800         if (err) {
 801                 dev_err(&intf->dev,
 802                         "Failed to initialize card, error %d\n", err);
 803                 return err;
 804         }
 805
 806         err = ops->dev_get_software_info(dev);
 807         if (err) {
 808                 dev_err(&intf->dev,
 809                         "Cannot get software info, error %d\n", err);
 810                 return err;
 811         }
 812
 813         if (ops->dev_get_software_details) {
 814                 err = ops->dev_get_software_details(dev);
 815                 if (err) {
 816                         dev_err(&intf->dev,
 817                                 "Cannot get software details, error %d\n", err);
 818                         return err;
 819                 }
 820         }
 821
 822         if (WARN_ON(!dev->cfg))
 823                 return -ENODEV;
 824
 825         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
 826                 ((dev->fw_version >> 24) & 0xff),
 827                 ((dev->fw_version >> 16) & 0xff),
 828                 (dev->fw_version & 0xffff));
 829
 830         dev_dbg(&intf->dev, "Max outstanding tx = %d URBs\n", dev->max_tx_urbs);
 831
 832         err = ops->dev_get_card_info(dev);
 833         if (err) {
 834                 dev_err(&intf->dev, "Cannot get card info, error %d\n", err);
 835                 return err;
 836         }
 837
 838         if (ops->dev_get_capabilities) {
 839                 err = ops->dev_get_capabilities(dev);
 840                 if (err) {
 841                         dev_err(&intf->dev,
 842                                 "Cannot get capabilities, error %d\n", err);
 843                         kvaser_usb_remove_interfaces(dev);
 844                         return err;
 845                 }
 846         }
 847
 848         for (i = 0; i < dev->nchannels; i++) {
 849                 err = kvaser_usb_init_one(dev, i);
 850                 if (err) {
 851                         kvaser_usb_remove_interfaces(dev);
 852                         return err;
 853                 }
 854         }
 855
 856         return 0;
 857 }
 858
 859 static void kvaser_usb_disconnect(struct usb_interface *intf)
 860 {
 861         struct kvaser_usb *dev = usb_get_intfdata(intf);
 862
 863         usb_set_intfdata(intf, NULL);
 864
 865         if (!dev)
 866                 return;
 867
 868         kvaser_usb_remove_interfaces(dev);
 869 }
 870
 871 static struct usb_driver kvaser_usb_driver = {
 872         .name = "kvaser_usb",
 873         .probe = kvaser_usb_probe,
 874         .disconnect = kvaser_usb_disconnect,
 875         .id_table = kvaser_usb_table,
 876 };
 877
 878 module_usb_driver(kvaser_usb_driver);
 879
 880 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
 881 MODULE_AUTHOR("Kvaser AB <support@kvaser.com>");
 882 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
 883 MODULE_LICENSE("GPL v2");