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