1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * CAN driver for esd electronics gmbh CAN-USB/2 and CAN-USB/Micro 4 * 5 * Copyright (C) 2010-2012 esd electronic system design gmbh, Matthias Fuchs <socketcan@esd.eu> 6 * Copyright (C) 2022 esd electronics gmbh, Frank Jungclaus <frank.jungclaus@esd.eu> 7 */ 8 #include <linux/ethtool.h> 9 #include <linux/signal.h> 10 #include <linux/slab.h> 11 #include <linux/module.h> 12 #include <linux/netdevice.h> 13 #include <linux/usb.h> 14 15 #include <linux/can.h> 16 #include <linux/can/dev.h> 17 #include <linux/can/error.h> 18 19 MODULE_AUTHOR("Matthias Fuchs <socketcan@esd.eu>"); 20 MODULE_AUTHOR("Frank Jungclaus <frank.jungclaus@esd.eu>"); 21 MODULE_DESCRIPTION("CAN driver for esd electronics gmbh CAN-USB/2 and CAN-USB/Micro interfaces"); 22 MODULE_LICENSE("GPL v2"); 23 24 /* USB vendor and product ID */ 25 #define USB_ESDGMBH_VENDOR_ID 0x0ab4 26 #define USB_CANUSB2_PRODUCT_ID 0x0010 27 #define USB_CANUSBM_PRODUCT_ID 0x0011 28 29 /* CAN controller clock frequencies */ 30 #define ESD_USB2_CAN_CLOCK 60000000 31 #define ESD_USBM_CAN_CLOCK 36000000 32 33 /* Maximum number of CAN nets */ 34 #define ESD_USB_MAX_NETS 2 35 36 /* USB commands */ 37 #define CMD_VERSION 1 /* also used for VERSION_REPLY */ 38 #define CMD_CAN_RX 2 /* device to host only */ 39 #define CMD_CAN_TX 3 /* also used for TX_DONE */ 40 #define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */ 41 #define CMD_TS 5 /* also used for TS_REPLY */ 42 #define CMD_IDADD 6 /* also used for IDADD_REPLY */ 43 44 /* esd CAN message flags - dlc field */ 45 #define ESD_RTR 0x10 46 47 /* esd CAN message flags - id field */ 48 #define ESD_EXTID 0x20000000 49 #define ESD_EVENT 0x40000000 50 #define ESD_IDMASK 0x1fffffff 51 52 /* esd CAN event ids */ 53 #define ESD_EV_CAN_ERROR_EXT 2 /* CAN controller specific diagnostic data */ 54 55 /* baudrate message flags */ 56 #define ESD_USB_UBR 0x80000000 57 #define ESD_USB_LOM 0x40000000 58 #define ESD_USB_NO_BAUDRATE 0x7fffffff 59 60 /* bit timing CAN-USB/2 */ 61 #define ESD_USB2_TSEG1_MIN 1 62 #define ESD_USB2_TSEG1_MAX 16 63 #define ESD_USB2_TSEG1_SHIFT 16 64 #define ESD_USB2_TSEG2_MIN 1 65 #define ESD_USB2_TSEG2_MAX 8 66 #define ESD_USB2_TSEG2_SHIFT 20 67 #define ESD_USB2_SJW_MAX 4 68 #define ESD_USB2_SJW_SHIFT 14 69 #define ESD_USBM_SJW_SHIFT 24 70 #define ESD_USB2_BRP_MIN 1 71 #define ESD_USB2_BRP_MAX 1024 72 #define ESD_USB2_BRP_INC 1 73 #define ESD_USB2_3_SAMPLES 0x00800000 74 75 /* esd IDADD message */ 76 #define ESD_ID_ENABLE 0x80 77 #define ESD_MAX_ID_SEGMENT 64 78 79 /* SJA1000 ECC register (emulated by usb firmware) */ 80 #define SJA1000_ECC_SEG 0x1F 81 #define SJA1000_ECC_DIR 0x20 82 #define SJA1000_ECC_ERR 0x06 83 #define SJA1000_ECC_BIT 0x00 84 #define SJA1000_ECC_FORM 0x40 85 #define SJA1000_ECC_STUFF 0x80 86 #define SJA1000_ECC_MASK 0xc0 87 88 /* esd bus state event codes */ 89 #define ESD_BUSSTATE_MASK 0xc0 90 #define ESD_BUSSTATE_WARN 0x40 91 #define ESD_BUSSTATE_ERRPASSIVE 0x80 92 #define ESD_BUSSTATE_BUSOFF 0xc0 93 94 #define RX_BUFFER_SIZE 1024 95 #define MAX_RX_URBS 4 96 #define MAX_TX_URBS 16 /* must be power of 2 */ 97 98 struct header_msg { 99 u8 len; /* len is always the total message length in 32bit words */ 100 u8 cmd; 101 u8 rsvd[2]; 102 }; 103 104 struct version_msg { 105 u8 len; 106 u8 cmd; 107 u8 rsvd; 108 u8 flags; 109 __le32 drv_version; 110 }; 111 112 struct version_reply_msg { 113 u8 len; 114 u8 cmd; 115 u8 nets; 116 u8 features; 117 __le32 version; 118 u8 name[16]; 119 __le32 rsvd; 120 __le32 ts; 121 }; 122 123 struct rx_msg { 124 u8 len; 125 u8 cmd; 126 u8 net; 127 u8 dlc; 128 __le32 ts; 129 __le32 id; /* upper 3 bits contain flags */ 130 u8 data[8]; 131 }; 132 133 struct tx_msg { 134 u8 len; 135 u8 cmd; 136 u8 net; 137 u8 dlc; 138 u32 hnd; /* opaque handle, not used by device */ 139 __le32 id; /* upper 3 bits contain flags */ 140 u8 data[8]; 141 }; 142 143 struct tx_done_msg { 144 u8 len; 145 u8 cmd; 146 u8 net; 147 u8 status; 148 u32 hnd; /* opaque handle, not used by device */ 149 __le32 ts; 150 }; 151 152 struct id_filter_msg { 153 u8 len; 154 u8 cmd; 155 u8 net; 156 u8 option; 157 __le32 mask[ESD_MAX_ID_SEGMENT + 1]; 158 }; 159 160 struct set_baudrate_msg { 161 u8 len; 162 u8 cmd; 163 u8 net; 164 u8 rsvd; 165 __le32 baud; 166 }; 167 168 /* Main message type used between library and application */ 169 struct __packed esd_usb_msg { 170 union { 171 struct header_msg hdr; 172 struct version_msg version; 173 struct version_reply_msg version_reply; 174 struct rx_msg rx; 175 struct tx_msg tx; 176 struct tx_done_msg txdone; 177 struct set_baudrate_msg setbaud; 178 struct id_filter_msg filter; 179 } msg; 180 }; 181 182 static struct usb_device_id esd_usb_table[] = { 183 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)}, 184 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSBM_PRODUCT_ID)}, 185 {} 186 }; 187 MODULE_DEVICE_TABLE(usb, esd_usb_table); 188 189 struct esd_usb_net_priv; 190 191 struct esd_tx_urb_context { 192 struct esd_usb_net_priv *priv; 193 u32 echo_index; 194 }; 195 196 struct esd_usb { 197 struct usb_device *udev; 198 struct esd_usb_net_priv *nets[ESD_USB_MAX_NETS]; 199 200 struct usb_anchor rx_submitted; 201 202 int net_count; 203 u32 version; 204 int rxinitdone; 205 void *rxbuf[MAX_RX_URBS]; 206 dma_addr_t rxbuf_dma[MAX_RX_URBS]; 207 }; 208 209 struct esd_usb_net_priv { 210 struct can_priv can; /* must be the first member */ 211 212 atomic_t active_tx_jobs; 213 struct usb_anchor tx_submitted; 214 struct esd_tx_urb_context tx_contexts[MAX_TX_URBS]; 215 216 struct esd_usb *usb; 217 struct net_device *netdev; 218 int index; 219 u8 old_state; 220 struct can_berr_counter bec; 221 }; 222 223 static void esd_usb_rx_event(struct esd_usb_net_priv *priv, 224 struct esd_usb_msg *msg) 225 { 226 struct net_device_stats *stats = &priv->netdev->stats; 227 struct can_frame *cf; 228 struct sk_buff *skb; 229 u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK; 230 231 if (id == ESD_EV_CAN_ERROR_EXT) { 232 u8 state = msg->msg.rx.data[0]; 233 u8 ecc = msg->msg.rx.data[1]; 234 u8 rxerr = msg->msg.rx.data[2]; 235 u8 txerr = msg->msg.rx.data[3]; 236 237 skb = alloc_can_err_skb(priv->netdev, &cf); 238 if (skb == NULL) { 239 stats->rx_dropped++; 240 return; 241 } 242 243 if (state != priv->old_state) { 244 priv->old_state = state; 245 246 switch (state & ESD_BUSSTATE_MASK) { 247 case ESD_BUSSTATE_BUSOFF: 248 priv->can.state = CAN_STATE_BUS_OFF; 249 cf->can_id |= CAN_ERR_BUSOFF; 250 priv->can.can_stats.bus_off++; 251 can_bus_off(priv->netdev); 252 break; 253 case ESD_BUSSTATE_WARN: 254 priv->can.state = CAN_STATE_ERROR_WARNING; 255 priv->can.can_stats.error_warning++; 256 break; 257 case ESD_BUSSTATE_ERRPASSIVE: 258 priv->can.state = CAN_STATE_ERROR_PASSIVE; 259 priv->can.can_stats.error_passive++; 260 break; 261 default: 262 priv->can.state = CAN_STATE_ERROR_ACTIVE; 263 break; 264 } 265 } else { 266 priv->can.can_stats.bus_error++; 267 stats->rx_errors++; 268 269 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR | 270 CAN_ERR_CNT; 271 272 switch (ecc & SJA1000_ECC_MASK) { 273 case SJA1000_ECC_BIT: 274 cf->data[2] |= CAN_ERR_PROT_BIT; 275 break; 276 case SJA1000_ECC_FORM: 277 cf->data[2] |= CAN_ERR_PROT_FORM; 278 break; 279 case SJA1000_ECC_STUFF: 280 cf->data[2] |= CAN_ERR_PROT_STUFF; 281 break; 282 default: 283 cf->data[3] = ecc & SJA1000_ECC_SEG; 284 break; 285 } 286 287 /* Error occurred during transmission? */ 288 if (!(ecc & SJA1000_ECC_DIR)) 289 cf->data[2] |= CAN_ERR_PROT_TX; 290 291 if (priv->can.state == CAN_STATE_ERROR_WARNING || 292 priv->can.state == CAN_STATE_ERROR_PASSIVE) { 293 cf->data[1] = (txerr > rxerr) ? 294 CAN_ERR_CRTL_TX_PASSIVE : 295 CAN_ERR_CRTL_RX_PASSIVE; 296 } 297 cf->data[6] = txerr; 298 cf->data[7] = rxerr; 299 } 300 301 priv->bec.txerr = txerr; 302 priv->bec.rxerr = rxerr; 303 304 netif_rx(skb); 305 } 306 } 307 308 static void esd_usb_rx_can_msg(struct esd_usb_net_priv *priv, 309 struct esd_usb_msg *msg) 310 { 311 struct net_device_stats *stats = &priv->netdev->stats; 312 struct can_frame *cf; 313 struct sk_buff *skb; 314 int i; 315 u32 id; 316 317 if (!netif_device_present(priv->netdev)) 318 return; 319 320 id = le32_to_cpu(msg->msg.rx.id); 321 322 if (id & ESD_EVENT) { 323 esd_usb_rx_event(priv, msg); 324 } else { 325 skb = alloc_can_skb(priv->netdev, &cf); 326 if (skb == NULL) { 327 stats->rx_dropped++; 328 return; 329 } 330 331 cf->can_id = id & ESD_IDMASK; 332 can_frame_set_cc_len(cf, msg->msg.rx.dlc & ~ESD_RTR, 333 priv->can.ctrlmode); 334 335 if (id & ESD_EXTID) 336 cf->can_id |= CAN_EFF_FLAG; 337 338 if (msg->msg.rx.dlc & ESD_RTR) { 339 cf->can_id |= CAN_RTR_FLAG; 340 } else { 341 for (i = 0; i < cf->len; i++) 342 cf->data[i] = msg->msg.rx.data[i]; 343 344 stats->rx_bytes += cf->len; 345 } 346 stats->rx_packets++; 347 348 netif_rx(skb); 349 } 350 } 351 352 static void esd_usb_tx_done_msg(struct esd_usb_net_priv *priv, 353 struct esd_usb_msg *msg) 354 { 355 struct net_device_stats *stats = &priv->netdev->stats; 356 struct net_device *netdev = priv->netdev; 357 struct esd_tx_urb_context *context; 358 359 if (!netif_device_present(netdev)) 360 return; 361 362 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)]; 363 364 if (!msg->msg.txdone.status) { 365 stats->tx_packets++; 366 stats->tx_bytes += can_get_echo_skb(netdev, context->echo_index, 367 NULL); 368 } else { 369 stats->tx_errors++; 370 can_free_echo_skb(netdev, context->echo_index, NULL); 371 } 372 373 /* Release context */ 374 context->echo_index = MAX_TX_URBS; 375 atomic_dec(&priv->active_tx_jobs); 376 377 netif_wake_queue(netdev); 378 } 379 380 static void esd_usb_read_bulk_callback(struct urb *urb) 381 { 382 struct esd_usb *dev = urb->context; 383 int retval; 384 int pos = 0; 385 int i; 386 387 switch (urb->status) { 388 case 0: /* success */ 389 break; 390 391 case -ENOENT: 392 case -EPIPE: 393 case -EPROTO: 394 case -ESHUTDOWN: 395 return; 396 397 default: 398 dev_info(dev->udev->dev.parent, 399 "Rx URB aborted (%d)\n", urb->status); 400 goto resubmit_urb; 401 } 402 403 while (pos < urb->actual_length) { 404 struct esd_usb_msg *msg; 405 406 msg = (struct esd_usb_msg *)(urb->transfer_buffer + pos); 407 408 switch (msg->msg.hdr.cmd) { 409 case CMD_CAN_RX: 410 if (msg->msg.rx.net >= dev->net_count) { 411 dev_err(dev->udev->dev.parent, "format error\n"); 412 break; 413 } 414 415 esd_usb_rx_can_msg(dev->nets[msg->msg.rx.net], msg); 416 break; 417 418 case CMD_CAN_TX: 419 if (msg->msg.txdone.net >= dev->net_count) { 420 dev_err(dev->udev->dev.parent, "format error\n"); 421 break; 422 } 423 424 esd_usb_tx_done_msg(dev->nets[msg->msg.txdone.net], 425 msg); 426 break; 427 } 428 429 pos += msg->msg.hdr.len << 2; 430 431 if (pos > urb->actual_length) { 432 dev_err(dev->udev->dev.parent, "format error\n"); 433 break; 434 } 435 } 436 437 resubmit_urb: 438 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), 439 urb->transfer_buffer, RX_BUFFER_SIZE, 440 esd_usb_read_bulk_callback, dev); 441 442 retval = usb_submit_urb(urb, GFP_ATOMIC); 443 if (retval == -ENODEV) { 444 for (i = 0; i < dev->net_count; i++) { 445 if (dev->nets[i]) 446 netif_device_detach(dev->nets[i]->netdev); 447 } 448 } else if (retval) { 449 dev_err(dev->udev->dev.parent, 450 "failed resubmitting read bulk urb: %d\n", retval); 451 } 452 } 453 454 /* callback for bulk IN urb */ 455 static void esd_usb_write_bulk_callback(struct urb *urb) 456 { 457 struct esd_tx_urb_context *context = urb->context; 458 struct esd_usb_net_priv *priv; 459 struct net_device *netdev; 460 size_t size = sizeof(struct esd_usb_msg); 461 462 WARN_ON(!context); 463 464 priv = context->priv; 465 netdev = priv->netdev; 466 467 /* free up our allocated buffer */ 468 usb_free_coherent(urb->dev, size, 469 urb->transfer_buffer, urb->transfer_dma); 470 471 if (!netif_device_present(netdev)) 472 return; 473 474 if (urb->status) 475 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); 476 477 netif_trans_update(netdev); 478 } 479 480 static ssize_t firmware_show(struct device *d, 481 struct device_attribute *attr, char *buf) 482 { 483 struct usb_interface *intf = to_usb_interface(d); 484 struct esd_usb *dev = usb_get_intfdata(intf); 485 486 return sprintf(buf, "%d.%d.%d\n", 487 (dev->version >> 12) & 0xf, 488 (dev->version >> 8) & 0xf, 489 dev->version & 0xff); 490 } 491 static DEVICE_ATTR_RO(firmware); 492 493 static ssize_t hardware_show(struct device *d, 494 struct device_attribute *attr, char *buf) 495 { 496 struct usb_interface *intf = to_usb_interface(d); 497 struct esd_usb *dev = usb_get_intfdata(intf); 498 499 return sprintf(buf, "%d.%d.%d\n", 500 (dev->version >> 28) & 0xf, 501 (dev->version >> 24) & 0xf, 502 (dev->version >> 16) & 0xff); 503 } 504 static DEVICE_ATTR_RO(hardware); 505 506 static ssize_t nets_show(struct device *d, 507 struct device_attribute *attr, char *buf) 508 { 509 struct usb_interface *intf = to_usb_interface(d); 510 struct esd_usb *dev = usb_get_intfdata(intf); 511 512 return sprintf(buf, "%d", dev->net_count); 513 } 514 static DEVICE_ATTR_RO(nets); 515 516 static int esd_usb_send_msg(struct esd_usb *dev, struct esd_usb_msg *msg) 517 { 518 int actual_length; 519 520 return usb_bulk_msg(dev->udev, 521 usb_sndbulkpipe(dev->udev, 2), 522 msg, 523 msg->msg.hdr.len << 2, 524 &actual_length, 525 1000); 526 } 527 528 static int esd_usb_wait_msg(struct esd_usb *dev, 529 struct esd_usb_msg *msg) 530 { 531 int actual_length; 532 533 return usb_bulk_msg(dev->udev, 534 usb_rcvbulkpipe(dev->udev, 1), 535 msg, 536 sizeof(*msg), 537 &actual_length, 538 1000); 539 } 540 541 static int esd_usb_setup_rx_urbs(struct esd_usb *dev) 542 { 543 int i, err = 0; 544 545 if (dev->rxinitdone) 546 return 0; 547 548 for (i = 0; i < MAX_RX_URBS; i++) { 549 struct urb *urb = NULL; 550 u8 *buf = NULL; 551 dma_addr_t buf_dma; 552 553 /* create a URB, and a buffer for it */ 554 urb = usb_alloc_urb(0, GFP_KERNEL); 555 if (!urb) { 556 err = -ENOMEM; 557 break; 558 } 559 560 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, 561 &buf_dma); 562 if (!buf) { 563 dev_warn(dev->udev->dev.parent, 564 "No memory left for USB buffer\n"); 565 err = -ENOMEM; 566 goto freeurb; 567 } 568 569 urb->transfer_dma = buf_dma; 570 571 usb_fill_bulk_urb(urb, dev->udev, 572 usb_rcvbulkpipe(dev->udev, 1), 573 buf, RX_BUFFER_SIZE, 574 esd_usb_read_bulk_callback, dev); 575 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 576 usb_anchor_urb(urb, &dev->rx_submitted); 577 578 err = usb_submit_urb(urb, GFP_KERNEL); 579 if (err) { 580 usb_unanchor_urb(urb); 581 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, 582 urb->transfer_dma); 583 goto freeurb; 584 } 585 586 dev->rxbuf[i] = buf; 587 dev->rxbuf_dma[i] = buf_dma; 588 589 freeurb: 590 /* Drop reference, USB core will take care of freeing it */ 591 usb_free_urb(urb); 592 if (err) 593 break; 594 } 595 596 /* Did we submit any URBs */ 597 if (i == 0) { 598 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); 599 return err; 600 } 601 602 /* Warn if we've couldn't transmit all the URBs */ 603 if (i < MAX_RX_URBS) { 604 dev_warn(dev->udev->dev.parent, 605 "rx performance may be slow\n"); 606 } 607 608 dev->rxinitdone = 1; 609 return 0; 610 } 611 612 /* Start interface */ 613 static int esd_usb_start(struct esd_usb_net_priv *priv) 614 { 615 struct esd_usb *dev = priv->usb; 616 struct net_device *netdev = priv->netdev; 617 struct esd_usb_msg *msg; 618 int err, i; 619 620 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 621 if (!msg) { 622 err = -ENOMEM; 623 goto out; 624 } 625 626 /* Enable all IDs 627 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). 628 * Each bit represents one 11 bit CAN identifier. A set bit 629 * enables reception of the corresponding CAN identifier. A cleared 630 * bit disabled this identifier. An additional bitmask value 631 * following the CAN 2.0A bits is used to enable reception of 632 * extended CAN frames. Only the LSB of this final mask is checked 633 * for the complete 29 bit ID range. The IDADD message also allows 634 * filter configuration for an ID subset. In this case you can add 635 * the number of the starting bitmask (0..64) to the filter.option 636 * field followed by only some bitmasks. 637 */ 638 msg->msg.hdr.cmd = CMD_IDADD; 639 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 640 msg->msg.filter.net = priv->index; 641 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 642 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) 643 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff); 644 /* enable 29bit extended IDs */ 645 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); 646 647 err = esd_usb_send_msg(dev, msg); 648 if (err) 649 goto out; 650 651 err = esd_usb_setup_rx_urbs(dev); 652 if (err) 653 goto out; 654 655 priv->can.state = CAN_STATE_ERROR_ACTIVE; 656 657 out: 658 if (err == -ENODEV) 659 netif_device_detach(netdev); 660 if (err) 661 netdev_err(netdev, "couldn't start device: %d\n", err); 662 663 kfree(msg); 664 return err; 665 } 666 667 static void unlink_all_urbs(struct esd_usb *dev) 668 { 669 struct esd_usb_net_priv *priv; 670 int i, j; 671 672 usb_kill_anchored_urbs(&dev->rx_submitted); 673 674 for (i = 0; i < MAX_RX_URBS; ++i) 675 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, 676 dev->rxbuf[i], dev->rxbuf_dma[i]); 677 678 for (i = 0; i < dev->net_count; i++) { 679 priv = dev->nets[i]; 680 if (priv) { 681 usb_kill_anchored_urbs(&priv->tx_submitted); 682 atomic_set(&priv->active_tx_jobs, 0); 683 684 for (j = 0; j < MAX_TX_URBS; j++) 685 priv->tx_contexts[j].echo_index = MAX_TX_URBS; 686 } 687 } 688 } 689 690 static int esd_usb_open(struct net_device *netdev) 691 { 692 struct esd_usb_net_priv *priv = netdev_priv(netdev); 693 int err; 694 695 /* common open */ 696 err = open_candev(netdev); 697 if (err) 698 return err; 699 700 /* finally start device */ 701 err = esd_usb_start(priv); 702 if (err) { 703 netdev_warn(netdev, "couldn't start device: %d\n", err); 704 close_candev(netdev); 705 return err; 706 } 707 708 netif_start_queue(netdev); 709 710 return 0; 711 } 712 713 static netdev_tx_t esd_usb_start_xmit(struct sk_buff *skb, 714 struct net_device *netdev) 715 { 716 struct esd_usb_net_priv *priv = netdev_priv(netdev); 717 struct esd_usb *dev = priv->usb; 718 struct esd_tx_urb_context *context = NULL; 719 struct net_device_stats *stats = &netdev->stats; 720 struct can_frame *cf = (struct can_frame *)skb->data; 721 struct esd_usb_msg *msg; 722 struct urb *urb; 723 u8 *buf; 724 int i, err; 725 int ret = NETDEV_TX_OK; 726 size_t size = sizeof(struct esd_usb_msg); 727 728 if (can_dropped_invalid_skb(netdev, skb)) 729 return NETDEV_TX_OK; 730 731 /* create a URB, and a buffer for it, and copy the data to the URB */ 732 urb = usb_alloc_urb(0, GFP_ATOMIC); 733 if (!urb) { 734 stats->tx_dropped++; 735 dev_kfree_skb(skb); 736 goto nourbmem; 737 } 738 739 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, 740 &urb->transfer_dma); 741 if (!buf) { 742 netdev_err(netdev, "No memory left for USB buffer\n"); 743 stats->tx_dropped++; 744 dev_kfree_skb(skb); 745 goto nobufmem; 746 } 747 748 msg = (struct esd_usb_msg *)buf; 749 750 msg->msg.hdr.len = 3; /* minimal length */ 751 msg->msg.hdr.cmd = CMD_CAN_TX; 752 msg->msg.tx.net = priv->index; 753 msg->msg.tx.dlc = can_get_cc_dlc(cf, priv->can.ctrlmode); 754 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); 755 756 if (cf->can_id & CAN_RTR_FLAG) 757 msg->msg.tx.dlc |= ESD_RTR; 758 759 if (cf->can_id & CAN_EFF_FLAG) 760 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); 761 762 for (i = 0; i < cf->len; i++) 763 msg->msg.tx.data[i] = cf->data[i]; 764 765 msg->msg.hdr.len += (cf->len + 3) >> 2; 766 767 for (i = 0; i < MAX_TX_URBS; i++) { 768 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { 769 context = &priv->tx_contexts[i]; 770 break; 771 } 772 } 773 774 /* This may never happen */ 775 if (!context) { 776 netdev_warn(netdev, "couldn't find free context\n"); 777 ret = NETDEV_TX_BUSY; 778 goto releasebuf; 779 } 780 781 context->priv = priv; 782 context->echo_index = i; 783 784 /* hnd must not be 0 - MSB is stripped in txdone handling */ 785 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ 786 787 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, 788 msg->msg.hdr.len << 2, 789 esd_usb_write_bulk_callback, context); 790 791 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 792 793 usb_anchor_urb(urb, &priv->tx_submitted); 794 795 can_put_echo_skb(skb, netdev, context->echo_index, 0); 796 797 atomic_inc(&priv->active_tx_jobs); 798 799 /* Slow down tx path */ 800 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) 801 netif_stop_queue(netdev); 802 803 err = usb_submit_urb(urb, GFP_ATOMIC); 804 if (err) { 805 can_free_echo_skb(netdev, context->echo_index, NULL); 806 807 atomic_dec(&priv->active_tx_jobs); 808 usb_unanchor_urb(urb); 809 810 stats->tx_dropped++; 811 812 if (err == -ENODEV) 813 netif_device_detach(netdev); 814 else 815 netdev_warn(netdev, "failed tx_urb %d\n", err); 816 817 goto releasebuf; 818 } 819 820 netif_trans_update(netdev); 821 822 /* Release our reference to this URB, the USB core will eventually free 823 * it entirely. 824 */ 825 usb_free_urb(urb); 826 827 return NETDEV_TX_OK; 828 829 releasebuf: 830 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); 831 832 nobufmem: 833 usb_free_urb(urb); 834 835 nourbmem: 836 return ret; 837 } 838 839 static int esd_usb_close(struct net_device *netdev) 840 { 841 struct esd_usb_net_priv *priv = netdev_priv(netdev); 842 struct esd_usb_msg *msg; 843 int i; 844 845 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 846 if (!msg) 847 return -ENOMEM; 848 849 /* Disable all IDs (see esd_usb_start()) */ 850 msg->msg.hdr.cmd = CMD_IDADD; 851 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 852 msg->msg.filter.net = priv->index; 853 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 854 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) 855 msg->msg.filter.mask[i] = 0; 856 if (esd_usb_send_msg(priv->usb, msg) < 0) 857 netdev_err(netdev, "sending idadd message failed\n"); 858 859 /* set CAN controller to reset mode */ 860 msg->msg.hdr.len = 2; 861 msg->msg.hdr.cmd = CMD_SETBAUD; 862 msg->msg.setbaud.net = priv->index; 863 msg->msg.setbaud.rsvd = 0; 864 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB_NO_BAUDRATE); 865 if (esd_usb_send_msg(priv->usb, msg) < 0) 866 netdev_err(netdev, "sending setbaud message failed\n"); 867 868 priv->can.state = CAN_STATE_STOPPED; 869 870 netif_stop_queue(netdev); 871 872 close_candev(netdev); 873 874 kfree(msg); 875 876 return 0; 877 } 878 879 static const struct net_device_ops esd_usb_netdev_ops = { 880 .ndo_open = esd_usb_open, 881 .ndo_stop = esd_usb_close, 882 .ndo_start_xmit = esd_usb_start_xmit, 883 .ndo_change_mtu = can_change_mtu, 884 }; 885 886 static const struct ethtool_ops esd_usb_ethtool_ops = { 887 .get_ts_info = ethtool_op_get_ts_info, 888 }; 889 890 static const struct can_bittiming_const esd_usb2_bittiming_const = { 891 .name = "esd_usb2", 892 .tseg1_min = ESD_USB2_TSEG1_MIN, 893 .tseg1_max = ESD_USB2_TSEG1_MAX, 894 .tseg2_min = ESD_USB2_TSEG2_MIN, 895 .tseg2_max = ESD_USB2_TSEG2_MAX, 896 .sjw_max = ESD_USB2_SJW_MAX, 897 .brp_min = ESD_USB2_BRP_MIN, 898 .brp_max = ESD_USB2_BRP_MAX, 899 .brp_inc = ESD_USB2_BRP_INC, 900 }; 901 902 static int esd_usb2_set_bittiming(struct net_device *netdev) 903 { 904 struct esd_usb_net_priv *priv = netdev_priv(netdev); 905 struct can_bittiming *bt = &priv->can.bittiming; 906 struct esd_usb_msg *msg; 907 int err; 908 u32 canbtr; 909 int sjw_shift; 910 911 canbtr = ESD_USB_UBR; 912 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 913 canbtr |= ESD_USB_LOM; 914 915 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); 916 917 if (le16_to_cpu(priv->usb->udev->descriptor.idProduct) == 918 USB_CANUSBM_PRODUCT_ID) 919 sjw_shift = ESD_USBM_SJW_SHIFT; 920 else 921 sjw_shift = ESD_USB2_SJW_SHIFT; 922 923 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) 924 << sjw_shift; 925 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) 926 & (ESD_USB2_TSEG1_MAX - 1)) 927 << ESD_USB2_TSEG1_SHIFT; 928 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) 929 << ESD_USB2_TSEG2_SHIFT; 930 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 931 canbtr |= ESD_USB2_3_SAMPLES; 932 933 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 934 if (!msg) 935 return -ENOMEM; 936 937 msg->msg.hdr.len = 2; 938 msg->msg.hdr.cmd = CMD_SETBAUD; 939 msg->msg.setbaud.net = priv->index; 940 msg->msg.setbaud.rsvd = 0; 941 msg->msg.setbaud.baud = cpu_to_le32(canbtr); 942 943 netdev_info(netdev, "setting BTR=%#x\n", canbtr); 944 945 err = esd_usb_send_msg(priv->usb, msg); 946 947 kfree(msg); 948 return err; 949 } 950 951 static int esd_usb_get_berr_counter(const struct net_device *netdev, 952 struct can_berr_counter *bec) 953 { 954 struct esd_usb_net_priv *priv = netdev_priv(netdev); 955 956 bec->txerr = priv->bec.txerr; 957 bec->rxerr = priv->bec.rxerr; 958 959 return 0; 960 } 961 962 static int esd_usb_set_mode(struct net_device *netdev, enum can_mode mode) 963 { 964 switch (mode) { 965 case CAN_MODE_START: 966 netif_wake_queue(netdev); 967 break; 968 969 default: 970 return -EOPNOTSUPP; 971 } 972 973 return 0; 974 } 975 976 static int esd_usb_probe_one_net(struct usb_interface *intf, int index) 977 { 978 struct esd_usb *dev = usb_get_intfdata(intf); 979 struct net_device *netdev; 980 struct esd_usb_net_priv *priv; 981 int err = 0; 982 int i; 983 984 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); 985 if (!netdev) { 986 dev_err(&intf->dev, "couldn't alloc candev\n"); 987 err = -ENOMEM; 988 goto done; 989 } 990 991 priv = netdev_priv(netdev); 992 993 init_usb_anchor(&priv->tx_submitted); 994 atomic_set(&priv->active_tx_jobs, 0); 995 996 for (i = 0; i < MAX_TX_URBS; i++) 997 priv->tx_contexts[i].echo_index = MAX_TX_URBS; 998 999 priv->usb = dev; 1000 priv->netdev = netdev; 1001 priv->index = index; 1002 1003 priv->can.state = CAN_STATE_STOPPED; 1004 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY | 1005 CAN_CTRLMODE_CC_LEN8_DLC; 1006 1007 if (le16_to_cpu(dev->udev->descriptor.idProduct) == 1008 USB_CANUSBM_PRODUCT_ID) 1009 priv->can.clock.freq = ESD_USBM_CAN_CLOCK; 1010 else { 1011 priv->can.clock.freq = ESD_USB2_CAN_CLOCK; 1012 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES; 1013 } 1014 1015 priv->can.bittiming_const = &esd_usb2_bittiming_const; 1016 priv->can.do_set_bittiming = esd_usb2_set_bittiming; 1017 priv->can.do_set_mode = esd_usb_set_mode; 1018 priv->can.do_get_berr_counter = esd_usb_get_berr_counter; 1019 1020 netdev->flags |= IFF_ECHO; /* we support local echo */ 1021 1022 netdev->netdev_ops = &esd_usb_netdev_ops; 1023 netdev->ethtool_ops = &esd_usb_ethtool_ops; 1024 1025 SET_NETDEV_DEV(netdev, &intf->dev); 1026 netdev->dev_id = index; 1027 1028 err = register_candev(netdev); 1029 if (err) { 1030 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); 1031 free_candev(netdev); 1032 err = -ENOMEM; 1033 goto done; 1034 } 1035 1036 dev->nets[index] = priv; 1037 netdev_info(netdev, "device %s registered\n", netdev->name); 1038 1039 done: 1040 return err; 1041 } 1042 1043 /* probe function for new USB devices 1044 * 1045 * check version information and number of available 1046 * CAN interfaces 1047 */ 1048 static int esd_usb_probe(struct usb_interface *intf, 1049 const struct usb_device_id *id) 1050 { 1051 struct esd_usb *dev; 1052 struct esd_usb_msg *msg; 1053 int i, err; 1054 1055 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1056 if (!dev) { 1057 err = -ENOMEM; 1058 goto done; 1059 } 1060 1061 dev->udev = interface_to_usbdev(intf); 1062 1063 init_usb_anchor(&dev->rx_submitted); 1064 1065 usb_set_intfdata(intf, dev); 1066 1067 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 1068 if (!msg) { 1069 err = -ENOMEM; 1070 goto free_msg; 1071 } 1072 1073 /* query number of CAN interfaces (nets) */ 1074 msg->msg.hdr.cmd = CMD_VERSION; 1075 msg->msg.hdr.len = 2; 1076 msg->msg.version.rsvd = 0; 1077 msg->msg.version.flags = 0; 1078 msg->msg.version.drv_version = 0; 1079 1080 err = esd_usb_send_msg(dev, msg); 1081 if (err < 0) { 1082 dev_err(&intf->dev, "sending version message failed\n"); 1083 goto free_msg; 1084 } 1085 1086 err = esd_usb_wait_msg(dev, msg); 1087 if (err < 0) { 1088 dev_err(&intf->dev, "no version message answer\n"); 1089 goto free_msg; 1090 } 1091 1092 dev->net_count = (int)msg->msg.version_reply.nets; 1093 dev->version = le32_to_cpu(msg->msg.version_reply.version); 1094 1095 if (device_create_file(&intf->dev, &dev_attr_firmware)) 1096 dev_err(&intf->dev, 1097 "Couldn't create device file for firmware\n"); 1098 1099 if (device_create_file(&intf->dev, &dev_attr_hardware)) 1100 dev_err(&intf->dev, 1101 "Couldn't create device file for hardware\n"); 1102 1103 if (device_create_file(&intf->dev, &dev_attr_nets)) 1104 dev_err(&intf->dev, 1105 "Couldn't create device file for nets\n"); 1106 1107 /* do per device probing */ 1108 for (i = 0; i < dev->net_count; i++) 1109 esd_usb_probe_one_net(intf, i); 1110 1111 free_msg: 1112 kfree(msg); 1113 if (err) 1114 kfree(dev); 1115 done: 1116 return err; 1117 } 1118 1119 /* called by the usb core when the device is removed from the system */ 1120 static void esd_usb_disconnect(struct usb_interface *intf) 1121 { 1122 struct esd_usb *dev = usb_get_intfdata(intf); 1123 struct net_device *netdev; 1124 int i; 1125 1126 device_remove_file(&intf->dev, &dev_attr_firmware); 1127 device_remove_file(&intf->dev, &dev_attr_hardware); 1128 device_remove_file(&intf->dev, &dev_attr_nets); 1129 1130 usb_set_intfdata(intf, NULL); 1131 1132 if (dev) { 1133 for (i = 0; i < dev->net_count; i++) { 1134 if (dev->nets[i]) { 1135 netdev = dev->nets[i]->netdev; 1136 unregister_netdev(netdev); 1137 free_candev(netdev); 1138 } 1139 } 1140 unlink_all_urbs(dev); 1141 kfree(dev); 1142 } 1143 } 1144 1145 /* usb specific object needed to register this driver with the usb subsystem */ 1146 static struct usb_driver esd_usb_driver = { 1147 .name = KBUILD_MODNAME, 1148 .probe = esd_usb_probe, 1149 .disconnect = esd_usb_disconnect, 1150 .id_table = esd_usb_table, 1151 }; 1152 1153 module_usb_driver(esd_usb_driver); 1154