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; 269 270 switch (ecc & SJA1000_ECC_MASK) { 271 case SJA1000_ECC_BIT: 272 cf->data[2] |= CAN_ERR_PROT_BIT; 273 break; 274 case SJA1000_ECC_FORM: 275 cf->data[2] |= CAN_ERR_PROT_FORM; 276 break; 277 case SJA1000_ECC_STUFF: 278 cf->data[2] |= CAN_ERR_PROT_STUFF; 279 break; 280 default: 281 cf->data[3] = ecc & SJA1000_ECC_SEG; 282 break; 283 } 284 285 /* Error occurred during transmission? */ 286 if (!(ecc & SJA1000_ECC_DIR)) 287 cf->data[2] |= CAN_ERR_PROT_TX; 288 289 if (priv->can.state == CAN_STATE_ERROR_WARNING || 290 priv->can.state == CAN_STATE_ERROR_PASSIVE) { 291 cf->data[1] = (txerr > rxerr) ? 292 CAN_ERR_CRTL_TX_PASSIVE : 293 CAN_ERR_CRTL_RX_PASSIVE; 294 } 295 cf->data[6] = txerr; 296 cf->data[7] = rxerr; 297 } 298 299 priv->bec.txerr = txerr; 300 priv->bec.rxerr = rxerr; 301 302 netif_rx(skb); 303 } 304 } 305 306 static void esd_usb_rx_can_msg(struct esd_usb_net_priv *priv, 307 struct esd_usb_msg *msg) 308 { 309 struct net_device_stats *stats = &priv->netdev->stats; 310 struct can_frame *cf; 311 struct sk_buff *skb; 312 int i; 313 u32 id; 314 315 if (!netif_device_present(priv->netdev)) 316 return; 317 318 id = le32_to_cpu(msg->msg.rx.id); 319 320 if (id & ESD_EVENT) { 321 esd_usb_rx_event(priv, msg); 322 } else { 323 skb = alloc_can_skb(priv->netdev, &cf); 324 if (skb == NULL) { 325 stats->rx_dropped++; 326 return; 327 } 328 329 cf->can_id = id & ESD_IDMASK; 330 can_frame_set_cc_len(cf, msg->msg.rx.dlc & ~ESD_RTR, 331 priv->can.ctrlmode); 332 333 if (id & ESD_EXTID) 334 cf->can_id |= CAN_EFF_FLAG; 335 336 if (msg->msg.rx.dlc & ESD_RTR) { 337 cf->can_id |= CAN_RTR_FLAG; 338 } else { 339 for (i = 0; i < cf->len; i++) 340 cf->data[i] = msg->msg.rx.data[i]; 341 342 stats->rx_bytes += cf->len; 343 } 344 stats->rx_packets++; 345 346 netif_rx(skb); 347 } 348 } 349 350 static void esd_usb_tx_done_msg(struct esd_usb_net_priv *priv, 351 struct esd_usb_msg *msg) 352 { 353 struct net_device_stats *stats = &priv->netdev->stats; 354 struct net_device *netdev = priv->netdev; 355 struct esd_tx_urb_context *context; 356 357 if (!netif_device_present(netdev)) 358 return; 359 360 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)]; 361 362 if (!msg->msg.txdone.status) { 363 stats->tx_packets++; 364 stats->tx_bytes += can_get_echo_skb(netdev, context->echo_index, 365 NULL); 366 } else { 367 stats->tx_errors++; 368 can_free_echo_skb(netdev, context->echo_index, NULL); 369 } 370 371 /* Release context */ 372 context->echo_index = MAX_TX_URBS; 373 atomic_dec(&priv->active_tx_jobs); 374 375 netif_wake_queue(netdev); 376 } 377 378 static void esd_usb_read_bulk_callback(struct urb *urb) 379 { 380 struct esd_usb *dev = urb->context; 381 int retval; 382 int pos = 0; 383 int i; 384 385 switch (urb->status) { 386 case 0: /* success */ 387 break; 388 389 case -ENOENT: 390 case -EPIPE: 391 case -EPROTO: 392 case -ESHUTDOWN: 393 return; 394 395 default: 396 dev_info(dev->udev->dev.parent, 397 "Rx URB aborted (%d)\n", urb->status); 398 goto resubmit_urb; 399 } 400 401 while (pos < urb->actual_length) { 402 struct esd_usb_msg *msg; 403 404 msg = (struct esd_usb_msg *)(urb->transfer_buffer + pos); 405 406 switch (msg->msg.hdr.cmd) { 407 case CMD_CAN_RX: 408 if (msg->msg.rx.net >= dev->net_count) { 409 dev_err(dev->udev->dev.parent, "format error\n"); 410 break; 411 } 412 413 esd_usb_rx_can_msg(dev->nets[msg->msg.rx.net], msg); 414 break; 415 416 case CMD_CAN_TX: 417 if (msg->msg.txdone.net >= dev->net_count) { 418 dev_err(dev->udev->dev.parent, "format error\n"); 419 break; 420 } 421 422 esd_usb_tx_done_msg(dev->nets[msg->msg.txdone.net], 423 msg); 424 break; 425 } 426 427 pos += msg->msg.hdr.len << 2; 428 429 if (pos > urb->actual_length) { 430 dev_err(dev->udev->dev.parent, "format error\n"); 431 break; 432 } 433 } 434 435 resubmit_urb: 436 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), 437 urb->transfer_buffer, RX_BUFFER_SIZE, 438 esd_usb_read_bulk_callback, dev); 439 440 retval = usb_submit_urb(urb, GFP_ATOMIC); 441 if (retval == -ENODEV) { 442 for (i = 0; i < dev->net_count; i++) { 443 if (dev->nets[i]) 444 netif_device_detach(dev->nets[i]->netdev); 445 } 446 } else if (retval) { 447 dev_err(dev->udev->dev.parent, 448 "failed resubmitting read bulk urb: %d\n", retval); 449 } 450 } 451 452 /* callback for bulk IN urb */ 453 static void esd_usb_write_bulk_callback(struct urb *urb) 454 { 455 struct esd_tx_urb_context *context = urb->context; 456 struct esd_usb_net_priv *priv; 457 struct net_device *netdev; 458 size_t size = sizeof(struct esd_usb_msg); 459 460 WARN_ON(!context); 461 462 priv = context->priv; 463 netdev = priv->netdev; 464 465 /* free up our allocated buffer */ 466 usb_free_coherent(urb->dev, size, 467 urb->transfer_buffer, urb->transfer_dma); 468 469 if (!netif_device_present(netdev)) 470 return; 471 472 if (urb->status) 473 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); 474 475 netif_trans_update(netdev); 476 } 477 478 static ssize_t firmware_show(struct device *d, 479 struct device_attribute *attr, char *buf) 480 { 481 struct usb_interface *intf = to_usb_interface(d); 482 struct esd_usb *dev = usb_get_intfdata(intf); 483 484 return sprintf(buf, "%d.%d.%d\n", 485 (dev->version >> 12) & 0xf, 486 (dev->version >> 8) & 0xf, 487 dev->version & 0xff); 488 } 489 static DEVICE_ATTR_RO(firmware); 490 491 static ssize_t hardware_show(struct device *d, 492 struct device_attribute *attr, char *buf) 493 { 494 struct usb_interface *intf = to_usb_interface(d); 495 struct esd_usb *dev = usb_get_intfdata(intf); 496 497 return sprintf(buf, "%d.%d.%d\n", 498 (dev->version >> 28) & 0xf, 499 (dev->version >> 24) & 0xf, 500 (dev->version >> 16) & 0xff); 501 } 502 static DEVICE_ATTR_RO(hardware); 503 504 static ssize_t nets_show(struct device *d, 505 struct device_attribute *attr, char *buf) 506 { 507 struct usb_interface *intf = to_usb_interface(d); 508 struct esd_usb *dev = usb_get_intfdata(intf); 509 510 return sprintf(buf, "%d", dev->net_count); 511 } 512 static DEVICE_ATTR_RO(nets); 513 514 static int esd_usb_send_msg(struct esd_usb *dev, struct esd_usb_msg *msg) 515 { 516 int actual_length; 517 518 return usb_bulk_msg(dev->udev, 519 usb_sndbulkpipe(dev->udev, 2), 520 msg, 521 msg->msg.hdr.len << 2, 522 &actual_length, 523 1000); 524 } 525 526 static int esd_usb_wait_msg(struct esd_usb *dev, 527 struct esd_usb_msg *msg) 528 { 529 int actual_length; 530 531 return usb_bulk_msg(dev->udev, 532 usb_rcvbulkpipe(dev->udev, 1), 533 msg, 534 sizeof(*msg), 535 &actual_length, 536 1000); 537 } 538 539 static int esd_usb_setup_rx_urbs(struct esd_usb *dev) 540 { 541 int i, err = 0; 542 543 if (dev->rxinitdone) 544 return 0; 545 546 for (i = 0; i < MAX_RX_URBS; i++) { 547 struct urb *urb = NULL; 548 u8 *buf = NULL; 549 dma_addr_t buf_dma; 550 551 /* create a URB, and a buffer for it */ 552 urb = usb_alloc_urb(0, GFP_KERNEL); 553 if (!urb) { 554 err = -ENOMEM; 555 break; 556 } 557 558 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, 559 &buf_dma); 560 if (!buf) { 561 dev_warn(dev->udev->dev.parent, 562 "No memory left for USB buffer\n"); 563 err = -ENOMEM; 564 goto freeurb; 565 } 566 567 urb->transfer_dma = buf_dma; 568 569 usb_fill_bulk_urb(urb, dev->udev, 570 usb_rcvbulkpipe(dev->udev, 1), 571 buf, RX_BUFFER_SIZE, 572 esd_usb_read_bulk_callback, dev); 573 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 574 usb_anchor_urb(urb, &dev->rx_submitted); 575 576 err = usb_submit_urb(urb, GFP_KERNEL); 577 if (err) { 578 usb_unanchor_urb(urb); 579 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, 580 urb->transfer_dma); 581 goto freeurb; 582 } 583 584 dev->rxbuf[i] = buf; 585 dev->rxbuf_dma[i] = buf_dma; 586 587 freeurb: 588 /* Drop reference, USB core will take care of freeing it */ 589 usb_free_urb(urb); 590 if (err) 591 break; 592 } 593 594 /* Did we submit any URBs */ 595 if (i == 0) { 596 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); 597 return err; 598 } 599 600 /* Warn if we've couldn't transmit all the URBs */ 601 if (i < MAX_RX_URBS) { 602 dev_warn(dev->udev->dev.parent, 603 "rx performance may be slow\n"); 604 } 605 606 dev->rxinitdone = 1; 607 return 0; 608 } 609 610 /* Start interface */ 611 static int esd_usb_start(struct esd_usb_net_priv *priv) 612 { 613 struct esd_usb *dev = priv->usb; 614 struct net_device *netdev = priv->netdev; 615 struct esd_usb_msg *msg; 616 int err, i; 617 618 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 619 if (!msg) { 620 err = -ENOMEM; 621 goto out; 622 } 623 624 /* Enable all IDs 625 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). 626 * Each bit represents one 11 bit CAN identifier. A set bit 627 * enables reception of the corresponding CAN identifier. A cleared 628 * bit disabled this identifier. An additional bitmask value 629 * following the CAN 2.0A bits is used to enable reception of 630 * extended CAN frames. Only the LSB of this final mask is checked 631 * for the complete 29 bit ID range. The IDADD message also allows 632 * filter configuration for an ID subset. In this case you can add 633 * the number of the starting bitmask (0..64) to the filter.option 634 * field followed by only some bitmasks. 635 */ 636 msg->msg.hdr.cmd = CMD_IDADD; 637 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 638 msg->msg.filter.net = priv->index; 639 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 640 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) 641 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff); 642 /* enable 29bit extended IDs */ 643 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); 644 645 err = esd_usb_send_msg(dev, msg); 646 if (err) 647 goto out; 648 649 err = esd_usb_setup_rx_urbs(dev); 650 if (err) 651 goto out; 652 653 priv->can.state = CAN_STATE_ERROR_ACTIVE; 654 655 out: 656 if (err == -ENODEV) 657 netif_device_detach(netdev); 658 if (err) 659 netdev_err(netdev, "couldn't start device: %d\n", err); 660 661 kfree(msg); 662 return err; 663 } 664 665 static void unlink_all_urbs(struct esd_usb *dev) 666 { 667 struct esd_usb_net_priv *priv; 668 int i, j; 669 670 usb_kill_anchored_urbs(&dev->rx_submitted); 671 672 for (i = 0; i < MAX_RX_URBS; ++i) 673 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, 674 dev->rxbuf[i], dev->rxbuf_dma[i]); 675 676 for (i = 0; i < dev->net_count; i++) { 677 priv = dev->nets[i]; 678 if (priv) { 679 usb_kill_anchored_urbs(&priv->tx_submitted); 680 atomic_set(&priv->active_tx_jobs, 0); 681 682 for (j = 0; j < MAX_TX_URBS; j++) 683 priv->tx_contexts[j].echo_index = MAX_TX_URBS; 684 } 685 } 686 } 687 688 static int esd_usb_open(struct net_device *netdev) 689 { 690 struct esd_usb_net_priv *priv = netdev_priv(netdev); 691 int err; 692 693 /* common open */ 694 err = open_candev(netdev); 695 if (err) 696 return err; 697 698 /* finally start device */ 699 err = esd_usb_start(priv); 700 if (err) { 701 netdev_warn(netdev, "couldn't start device: %d\n", err); 702 close_candev(netdev); 703 return err; 704 } 705 706 netif_start_queue(netdev); 707 708 return 0; 709 } 710 711 static netdev_tx_t esd_usb_start_xmit(struct sk_buff *skb, 712 struct net_device *netdev) 713 { 714 struct esd_usb_net_priv *priv = netdev_priv(netdev); 715 struct esd_usb *dev = priv->usb; 716 struct esd_tx_urb_context *context = NULL; 717 struct net_device_stats *stats = &netdev->stats; 718 struct can_frame *cf = (struct can_frame *)skb->data; 719 struct esd_usb_msg *msg; 720 struct urb *urb; 721 u8 *buf; 722 int i, err; 723 int ret = NETDEV_TX_OK; 724 size_t size = sizeof(struct esd_usb_msg); 725 726 if (can_dropped_invalid_skb(netdev, skb)) 727 return NETDEV_TX_OK; 728 729 /* create a URB, and a buffer for it, and copy the data to the URB */ 730 urb = usb_alloc_urb(0, GFP_ATOMIC); 731 if (!urb) { 732 stats->tx_dropped++; 733 dev_kfree_skb(skb); 734 goto nourbmem; 735 } 736 737 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, 738 &urb->transfer_dma); 739 if (!buf) { 740 netdev_err(netdev, "No memory left for USB buffer\n"); 741 stats->tx_dropped++; 742 dev_kfree_skb(skb); 743 goto nobufmem; 744 } 745 746 msg = (struct esd_usb_msg *)buf; 747 748 msg->msg.hdr.len = 3; /* minimal length */ 749 msg->msg.hdr.cmd = CMD_CAN_TX; 750 msg->msg.tx.net = priv->index; 751 msg->msg.tx.dlc = can_get_cc_dlc(cf, priv->can.ctrlmode); 752 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); 753 754 if (cf->can_id & CAN_RTR_FLAG) 755 msg->msg.tx.dlc |= ESD_RTR; 756 757 if (cf->can_id & CAN_EFF_FLAG) 758 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); 759 760 for (i = 0; i < cf->len; i++) 761 msg->msg.tx.data[i] = cf->data[i]; 762 763 msg->msg.hdr.len += (cf->len + 3) >> 2; 764 765 for (i = 0; i < MAX_TX_URBS; i++) { 766 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { 767 context = &priv->tx_contexts[i]; 768 break; 769 } 770 } 771 772 /* This may never happen */ 773 if (!context) { 774 netdev_warn(netdev, "couldn't find free context\n"); 775 ret = NETDEV_TX_BUSY; 776 goto releasebuf; 777 } 778 779 context->priv = priv; 780 context->echo_index = i; 781 782 /* hnd must not be 0 - MSB is stripped in txdone handling */ 783 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ 784 785 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, 786 msg->msg.hdr.len << 2, 787 esd_usb_write_bulk_callback, context); 788 789 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 790 791 usb_anchor_urb(urb, &priv->tx_submitted); 792 793 can_put_echo_skb(skb, netdev, context->echo_index, 0); 794 795 atomic_inc(&priv->active_tx_jobs); 796 797 /* Slow down tx path */ 798 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) 799 netif_stop_queue(netdev); 800 801 err = usb_submit_urb(urb, GFP_ATOMIC); 802 if (err) { 803 can_free_echo_skb(netdev, context->echo_index, NULL); 804 805 atomic_dec(&priv->active_tx_jobs); 806 usb_unanchor_urb(urb); 807 808 stats->tx_dropped++; 809 810 if (err == -ENODEV) 811 netif_device_detach(netdev); 812 else 813 netdev_warn(netdev, "failed tx_urb %d\n", err); 814 815 goto releasebuf; 816 } 817 818 netif_trans_update(netdev); 819 820 /* Release our reference to this URB, the USB core will eventually free 821 * it entirely. 822 */ 823 usb_free_urb(urb); 824 825 return NETDEV_TX_OK; 826 827 releasebuf: 828 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); 829 830 nobufmem: 831 usb_free_urb(urb); 832 833 nourbmem: 834 return ret; 835 } 836 837 static int esd_usb_close(struct net_device *netdev) 838 { 839 struct esd_usb_net_priv *priv = netdev_priv(netdev); 840 struct esd_usb_msg *msg; 841 int i; 842 843 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 844 if (!msg) 845 return -ENOMEM; 846 847 /* Disable all IDs (see esd_usb_start()) */ 848 msg->msg.hdr.cmd = CMD_IDADD; 849 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 850 msg->msg.filter.net = priv->index; 851 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 852 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) 853 msg->msg.filter.mask[i] = 0; 854 if (esd_usb_send_msg(priv->usb, msg) < 0) 855 netdev_err(netdev, "sending idadd message failed\n"); 856 857 /* set CAN controller to reset mode */ 858 msg->msg.hdr.len = 2; 859 msg->msg.hdr.cmd = CMD_SETBAUD; 860 msg->msg.setbaud.net = priv->index; 861 msg->msg.setbaud.rsvd = 0; 862 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB_NO_BAUDRATE); 863 if (esd_usb_send_msg(priv->usb, msg) < 0) 864 netdev_err(netdev, "sending setbaud message failed\n"); 865 866 priv->can.state = CAN_STATE_STOPPED; 867 868 netif_stop_queue(netdev); 869 870 close_candev(netdev); 871 872 kfree(msg); 873 874 return 0; 875 } 876 877 static const struct net_device_ops esd_usb_netdev_ops = { 878 .ndo_open = esd_usb_open, 879 .ndo_stop = esd_usb_close, 880 .ndo_start_xmit = esd_usb_start_xmit, 881 .ndo_change_mtu = can_change_mtu, 882 }; 883 884 static const struct can_bittiming_const esd_usb2_bittiming_const = { 885 .name = "esd_usb2", 886 .tseg1_min = ESD_USB2_TSEG1_MIN, 887 .tseg1_max = ESD_USB2_TSEG1_MAX, 888 .tseg2_min = ESD_USB2_TSEG2_MIN, 889 .tseg2_max = ESD_USB2_TSEG2_MAX, 890 .sjw_max = ESD_USB2_SJW_MAX, 891 .brp_min = ESD_USB2_BRP_MIN, 892 .brp_max = ESD_USB2_BRP_MAX, 893 .brp_inc = ESD_USB2_BRP_INC, 894 }; 895 896 static int esd_usb2_set_bittiming(struct net_device *netdev) 897 { 898 struct esd_usb_net_priv *priv = netdev_priv(netdev); 899 struct can_bittiming *bt = &priv->can.bittiming; 900 struct esd_usb_msg *msg; 901 int err; 902 u32 canbtr; 903 int sjw_shift; 904 905 canbtr = ESD_USB_UBR; 906 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 907 canbtr |= ESD_USB_LOM; 908 909 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); 910 911 if (le16_to_cpu(priv->usb->udev->descriptor.idProduct) == 912 USB_CANUSBM_PRODUCT_ID) 913 sjw_shift = ESD_USBM_SJW_SHIFT; 914 else 915 sjw_shift = ESD_USB2_SJW_SHIFT; 916 917 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) 918 << sjw_shift; 919 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) 920 & (ESD_USB2_TSEG1_MAX - 1)) 921 << ESD_USB2_TSEG1_SHIFT; 922 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) 923 << ESD_USB2_TSEG2_SHIFT; 924 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 925 canbtr |= ESD_USB2_3_SAMPLES; 926 927 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 928 if (!msg) 929 return -ENOMEM; 930 931 msg->msg.hdr.len = 2; 932 msg->msg.hdr.cmd = CMD_SETBAUD; 933 msg->msg.setbaud.net = priv->index; 934 msg->msg.setbaud.rsvd = 0; 935 msg->msg.setbaud.baud = cpu_to_le32(canbtr); 936 937 netdev_info(netdev, "setting BTR=%#x\n", canbtr); 938 939 err = esd_usb_send_msg(priv->usb, msg); 940 941 kfree(msg); 942 return err; 943 } 944 945 static int esd_usb_get_berr_counter(const struct net_device *netdev, 946 struct can_berr_counter *bec) 947 { 948 struct esd_usb_net_priv *priv = netdev_priv(netdev); 949 950 bec->txerr = priv->bec.txerr; 951 bec->rxerr = priv->bec.rxerr; 952 953 return 0; 954 } 955 956 static int esd_usb_set_mode(struct net_device *netdev, enum can_mode mode) 957 { 958 switch (mode) { 959 case CAN_MODE_START: 960 netif_wake_queue(netdev); 961 break; 962 963 default: 964 return -EOPNOTSUPP; 965 } 966 967 return 0; 968 } 969 970 static int esd_usb_probe_one_net(struct usb_interface *intf, int index) 971 { 972 struct esd_usb *dev = usb_get_intfdata(intf); 973 struct net_device *netdev; 974 struct esd_usb_net_priv *priv; 975 int err = 0; 976 int i; 977 978 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); 979 if (!netdev) { 980 dev_err(&intf->dev, "couldn't alloc candev\n"); 981 err = -ENOMEM; 982 goto done; 983 } 984 985 priv = netdev_priv(netdev); 986 987 init_usb_anchor(&priv->tx_submitted); 988 atomic_set(&priv->active_tx_jobs, 0); 989 990 for (i = 0; i < MAX_TX_URBS; i++) 991 priv->tx_contexts[i].echo_index = MAX_TX_URBS; 992 993 priv->usb = dev; 994 priv->netdev = netdev; 995 priv->index = index; 996 997 priv->can.state = CAN_STATE_STOPPED; 998 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY | 999 CAN_CTRLMODE_CC_LEN8_DLC; 1000 1001 if (le16_to_cpu(dev->udev->descriptor.idProduct) == 1002 USB_CANUSBM_PRODUCT_ID) 1003 priv->can.clock.freq = ESD_USBM_CAN_CLOCK; 1004 else { 1005 priv->can.clock.freq = ESD_USB2_CAN_CLOCK; 1006 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES; 1007 } 1008 1009 priv->can.bittiming_const = &esd_usb2_bittiming_const; 1010 priv->can.do_set_bittiming = esd_usb2_set_bittiming; 1011 priv->can.do_set_mode = esd_usb_set_mode; 1012 priv->can.do_get_berr_counter = esd_usb_get_berr_counter; 1013 1014 netdev->flags |= IFF_ECHO; /* we support local echo */ 1015 1016 netdev->netdev_ops = &esd_usb_netdev_ops; 1017 1018 SET_NETDEV_DEV(netdev, &intf->dev); 1019 netdev->dev_id = index; 1020 1021 err = register_candev(netdev); 1022 if (err) { 1023 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); 1024 free_candev(netdev); 1025 err = -ENOMEM; 1026 goto done; 1027 } 1028 1029 dev->nets[index] = priv; 1030 netdev_info(netdev, "device %s registered\n", netdev->name); 1031 1032 done: 1033 return err; 1034 } 1035 1036 /* probe function for new USB devices 1037 * 1038 * check version information and number of available 1039 * CAN interfaces 1040 */ 1041 static int esd_usb_probe(struct usb_interface *intf, 1042 const struct usb_device_id *id) 1043 { 1044 struct esd_usb *dev; 1045 struct esd_usb_msg *msg; 1046 int i, err; 1047 1048 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1049 if (!dev) { 1050 err = -ENOMEM; 1051 goto done; 1052 } 1053 1054 dev->udev = interface_to_usbdev(intf); 1055 1056 init_usb_anchor(&dev->rx_submitted); 1057 1058 usb_set_intfdata(intf, dev); 1059 1060 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 1061 if (!msg) { 1062 err = -ENOMEM; 1063 goto free_msg; 1064 } 1065 1066 /* query number of CAN interfaces (nets) */ 1067 msg->msg.hdr.cmd = CMD_VERSION; 1068 msg->msg.hdr.len = 2; 1069 msg->msg.version.rsvd = 0; 1070 msg->msg.version.flags = 0; 1071 msg->msg.version.drv_version = 0; 1072 1073 err = esd_usb_send_msg(dev, msg); 1074 if (err < 0) { 1075 dev_err(&intf->dev, "sending version message failed\n"); 1076 goto free_msg; 1077 } 1078 1079 err = esd_usb_wait_msg(dev, msg); 1080 if (err < 0) { 1081 dev_err(&intf->dev, "no version message answer\n"); 1082 goto free_msg; 1083 } 1084 1085 dev->net_count = (int)msg->msg.version_reply.nets; 1086 dev->version = le32_to_cpu(msg->msg.version_reply.version); 1087 1088 if (device_create_file(&intf->dev, &dev_attr_firmware)) 1089 dev_err(&intf->dev, 1090 "Couldn't create device file for firmware\n"); 1091 1092 if (device_create_file(&intf->dev, &dev_attr_hardware)) 1093 dev_err(&intf->dev, 1094 "Couldn't create device file for hardware\n"); 1095 1096 if (device_create_file(&intf->dev, &dev_attr_nets)) 1097 dev_err(&intf->dev, 1098 "Couldn't create device file for nets\n"); 1099 1100 /* do per device probing */ 1101 for (i = 0; i < dev->net_count; i++) 1102 esd_usb_probe_one_net(intf, i); 1103 1104 free_msg: 1105 kfree(msg); 1106 if (err) 1107 kfree(dev); 1108 done: 1109 return err; 1110 } 1111 1112 /* called by the usb core when the device is removed from the system */ 1113 static void esd_usb_disconnect(struct usb_interface *intf) 1114 { 1115 struct esd_usb *dev = usb_get_intfdata(intf); 1116 struct net_device *netdev; 1117 int i; 1118 1119 device_remove_file(&intf->dev, &dev_attr_firmware); 1120 device_remove_file(&intf->dev, &dev_attr_hardware); 1121 device_remove_file(&intf->dev, &dev_attr_nets); 1122 1123 usb_set_intfdata(intf, NULL); 1124 1125 if (dev) { 1126 for (i = 0; i < dev->net_count; i++) { 1127 if (dev->nets[i]) { 1128 netdev = dev->nets[i]->netdev; 1129 unregister_netdev(netdev); 1130 free_candev(netdev); 1131 } 1132 } 1133 unlink_all_urbs(dev); 1134 kfree(dev); 1135 } 1136 } 1137 1138 /* usb specific object needed to register this driver with the usb subsystem */ 1139 static struct usb_driver esd_usb_driver = { 1140 .name = "esd_usb", 1141 .probe = esd_usb_probe, 1142 .disconnect = esd_usb_disconnect, 1143 .id_table = esd_usb_table, 1144 }; 1145 1146 module_usb_driver(esd_usb_driver); 1147