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(sizeof(*priv) + 647 dev->max_tx_urbs * sizeof(*priv->tx_contexts), 648 dev->max_tx_urbs); 649 if (!netdev) { 650 dev_err(&dev->intf->dev, "Cannot alloc candev\n"); 651 return -ENOMEM; 652 } 653 654 priv = netdev_priv(netdev); 655 656 init_usb_anchor(&priv->tx_submitted); 657 init_completion(&priv->start_comp); 658 init_completion(&priv->stop_comp); 659 priv->can.ctrlmode_supported = 0; 660 661 priv->dev = dev; 662 priv->netdev = netdev; 663 priv->channel = channel; 664 665 spin_lock_init(&priv->tx_contexts_lock); 666 kvaser_usb_reset_tx_urb_contexts(priv); 667 668 priv->can.state = CAN_STATE_STOPPED; 669 priv->can.clock.freq = dev->cfg->clock.freq; 670 priv->can.bittiming_const = dev->cfg->bittiming_const; 671 priv->can.do_set_bittiming = dev->ops->dev_set_bittiming; 672 priv->can.do_set_mode = dev->ops->dev_set_mode; 673 if ((id->driver_info & KVASER_USB_HAS_TXRX_ERRORS) || 674 (priv->dev->card_data.capabilities & KVASER_USB_CAP_BERR_CAP)) 675 priv->can.do_get_berr_counter = dev->ops->dev_get_berr_counter; 676 if (id->driver_info & KVASER_USB_HAS_SILENT_MODE) 677 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY; 678 679 priv->can.ctrlmode_supported |= dev->card_data.ctrlmode_supported; 680 681 if (priv->can.ctrlmode_supported & CAN_CTRLMODE_FD) { 682 priv->can.data_bittiming_const = dev->cfg->data_bittiming_const; 683 priv->can.do_set_data_bittiming = 684 dev->ops->dev_set_data_bittiming; 685 } 686 687 netdev->flags |= IFF_ECHO; 688 689 netdev->netdev_ops = &kvaser_usb_netdev_ops; 690 691 SET_NETDEV_DEV(netdev, &dev->intf->dev); 692 netdev->dev_id = channel; 693 694 dev->nets[channel] = priv; 695 696 err = register_candev(netdev); 697 if (err) { 698 dev_err(&dev->intf->dev, "Failed to register CAN device\n"); 699 free_candev(netdev); 700 dev->nets[channel] = NULL; 701 return err; 702 } 703 704 netdev_dbg(netdev, "device registered\n"); 705 706 return 0; 707 } 708 709 static int kvaser_usb_probe(struct usb_interface *intf, 710 const struct usb_device_id *id) 711 { 712 struct kvaser_usb *dev; 713 int err; 714 int i; 715 716 dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL); 717 if (!dev) 718 return -ENOMEM; 719 720 if (kvaser_is_leaf(id)) { 721 dev->card_data.leaf.family = KVASER_LEAF; 722 dev->ops = &kvaser_usb_leaf_dev_ops; 723 } else if (kvaser_is_usbcan(id)) { 724 dev->card_data.leaf.family = KVASER_USBCAN; 725 dev->ops = &kvaser_usb_leaf_dev_ops; 726 } else if (kvaser_is_hydra(id)) { 727 dev->ops = &kvaser_usb_hydra_dev_ops; 728 } else { 729 dev_err(&intf->dev, 730 "Product ID (%d) is not a supported Kvaser USB device\n", 731 id->idProduct); 732 return -ENODEV; 733 } 734 735 dev->intf = intf; 736 737 err = dev->ops->dev_setup_endpoints(dev); 738 if (err) { 739 dev_err(&intf->dev, "Cannot get usb endpoint(s)"); 740 return err; 741 } 742 743 dev->udev = interface_to_usbdev(intf); 744 745 init_usb_anchor(&dev->rx_submitted); 746 747 usb_set_intfdata(intf, dev); 748 749 dev->card_data.ctrlmode_supported = 0; 750 dev->card_data.capabilities = 0; 751 err = dev->ops->dev_init_card(dev); 752 if (err) { 753 dev_err(&intf->dev, 754 "Failed to initialize card, error %d\n", err); 755 return err; 756 } 757 758 err = dev->ops->dev_get_software_info(dev); 759 if (err) { 760 dev_err(&intf->dev, 761 "Cannot get software info, error %d\n", err); 762 return err; 763 } 764 765 if (dev->ops->dev_get_software_details) { 766 err = dev->ops->dev_get_software_details(dev); 767 if (err) { 768 dev_err(&intf->dev, 769 "Cannot get software details, error %d\n", err); 770 return err; 771 } 772 } 773 774 if (WARN_ON(!dev->cfg)) 775 return -ENODEV; 776 777 dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n", 778 ((dev->fw_version >> 24) & 0xff), 779 ((dev->fw_version >> 16) & 0xff), 780 (dev->fw_version & 0xffff)); 781 782 dev_dbg(&intf->dev, "Max outstanding tx = %d URBs\n", dev->max_tx_urbs); 783 784 err = dev->ops->dev_get_card_info(dev); 785 if (err) { 786 dev_err(&intf->dev, "Cannot get card info, error %d\n", err); 787 return err; 788 } 789 790 if (dev->ops->dev_get_capabilities) { 791 err = dev->ops->dev_get_capabilities(dev); 792 if (err) { 793 dev_err(&intf->dev, 794 "Cannot get capabilities, error %d\n", err); 795 kvaser_usb_remove_interfaces(dev); 796 return err; 797 } 798 } 799 800 for (i = 0; i < dev->nchannels; i++) { 801 err = kvaser_usb_init_one(dev, id, i); 802 if (err) { 803 kvaser_usb_remove_interfaces(dev); 804 return err; 805 } 806 } 807 808 return 0; 809 } 810 811 static void kvaser_usb_disconnect(struct usb_interface *intf) 812 { 813 struct kvaser_usb *dev = usb_get_intfdata(intf); 814 815 usb_set_intfdata(intf, NULL); 816 817 if (!dev) 818 return; 819 820 kvaser_usb_remove_interfaces(dev); 821 } 822 823 static struct usb_driver kvaser_usb_driver = { 824 .name = "kvaser_usb", 825 .probe = kvaser_usb_probe, 826 .disconnect = kvaser_usb_disconnect, 827 .id_table = kvaser_usb_table, 828 }; 829 830 module_usb_driver(kvaser_usb_driver); 831 832 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>"); 833 MODULE_AUTHOR("Kvaser AB <support@kvaser.com>"); 834 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices"); 835 MODULE_LICENSE("GPL v2"); 836