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 union { 131 u8 data[8]; 132 struct { 133 u8 status; /* CAN Controller Status */ 134 u8 ecc; /* Error Capture Register */ 135 u8 rec; /* RX Error Counter */ 136 u8 tec; /* TX Error Counter */ 137 } ev_can_err_ext; /* For ESD_EV_CAN_ERROR_EXT */ 138 }; 139 }; 140 141 struct tx_msg { 142 u8 len; 143 u8 cmd; 144 u8 net; 145 u8 dlc; 146 u32 hnd; /* opaque handle, not used by device */ 147 __le32 id; /* upper 3 bits contain flags */ 148 u8 data[8]; 149 }; 150 151 struct tx_done_msg { 152 u8 len; 153 u8 cmd; 154 u8 net; 155 u8 status; 156 u32 hnd; /* opaque handle, not used by device */ 157 __le32 ts; 158 }; 159 160 struct id_filter_msg { 161 u8 len; 162 u8 cmd; 163 u8 net; 164 u8 option; 165 __le32 mask[ESD_MAX_ID_SEGMENT + 1]; 166 }; 167 168 struct set_baudrate_msg { 169 u8 len; 170 u8 cmd; 171 u8 net; 172 u8 rsvd; 173 __le32 baud; 174 }; 175 176 /* Main message type used between library and application */ 177 struct __packed esd_usb_msg { 178 union { 179 struct header_msg hdr; 180 struct version_msg version; 181 struct version_reply_msg version_reply; 182 struct rx_msg rx; 183 struct tx_msg tx; 184 struct tx_done_msg txdone; 185 struct set_baudrate_msg setbaud; 186 struct id_filter_msg filter; 187 } msg; 188 }; 189 190 static struct usb_device_id esd_usb_table[] = { 191 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)}, 192 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSBM_PRODUCT_ID)}, 193 {} 194 }; 195 MODULE_DEVICE_TABLE(usb, esd_usb_table); 196 197 struct esd_usb_net_priv; 198 199 struct esd_tx_urb_context { 200 struct esd_usb_net_priv *priv; 201 u32 echo_index; 202 }; 203 204 struct esd_usb { 205 struct usb_device *udev; 206 struct esd_usb_net_priv *nets[ESD_USB_MAX_NETS]; 207 208 struct usb_anchor rx_submitted; 209 210 int net_count; 211 u32 version; 212 int rxinitdone; 213 void *rxbuf[MAX_RX_URBS]; 214 dma_addr_t rxbuf_dma[MAX_RX_URBS]; 215 }; 216 217 struct esd_usb_net_priv { 218 struct can_priv can; /* must be the first member */ 219 220 atomic_t active_tx_jobs; 221 struct usb_anchor tx_submitted; 222 struct esd_tx_urb_context tx_contexts[MAX_TX_URBS]; 223 224 struct esd_usb *usb; 225 struct net_device *netdev; 226 int index; 227 u8 old_state; 228 struct can_berr_counter bec; 229 }; 230 231 static void esd_usb_rx_event(struct esd_usb_net_priv *priv, 232 struct esd_usb_msg *msg) 233 { 234 struct net_device_stats *stats = &priv->netdev->stats; 235 struct can_frame *cf; 236 struct sk_buff *skb; 237 u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK; 238 239 if (id == ESD_EV_CAN_ERROR_EXT) { 240 u8 state = msg->msg.rx.ev_can_err_ext.status; 241 u8 ecc = msg->msg.rx.ev_can_err_ext.ecc; 242 u8 rxerr = msg->msg.rx.ev_can_err_ext.rec; 243 u8 txerr = msg->msg.rx.ev_can_err_ext.tec; 244 245 netdev_dbg(priv->netdev, 246 "CAN_ERR_EV_EXT: dlc=%#02x state=%02x ecc=%02x rec=%02x tec=%02x\n", 247 msg->msg.rx.dlc, state, ecc, rxerr, txerr); 248 249 skb = alloc_can_err_skb(priv->netdev, &cf); 250 251 if (state != priv->old_state) { 252 enum can_state tx_state, rx_state; 253 enum can_state new_state = CAN_STATE_ERROR_ACTIVE; 254 255 priv->old_state = state; 256 257 switch (state & ESD_BUSSTATE_MASK) { 258 case ESD_BUSSTATE_BUSOFF: 259 new_state = CAN_STATE_BUS_OFF; 260 can_bus_off(priv->netdev); 261 break; 262 case ESD_BUSSTATE_WARN: 263 new_state = CAN_STATE_ERROR_WARNING; 264 break; 265 case ESD_BUSSTATE_ERRPASSIVE: 266 new_state = CAN_STATE_ERROR_PASSIVE; 267 break; 268 default: 269 new_state = CAN_STATE_ERROR_ACTIVE; 270 txerr = 0; 271 rxerr = 0; 272 break; 273 } 274 275 if (new_state != priv->can.state) { 276 tx_state = (txerr >= rxerr) ? new_state : 0; 277 rx_state = (txerr <= rxerr) ? new_state : 0; 278 can_change_state(priv->netdev, cf, 279 tx_state, rx_state); 280 } 281 } else if (skb) { 282 priv->can.can_stats.bus_error++; 283 stats->rx_errors++; 284 285 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 286 287 switch (ecc & SJA1000_ECC_MASK) { 288 case SJA1000_ECC_BIT: 289 cf->data[2] |= CAN_ERR_PROT_BIT; 290 break; 291 case SJA1000_ECC_FORM: 292 cf->data[2] |= CAN_ERR_PROT_FORM; 293 break; 294 case SJA1000_ECC_STUFF: 295 cf->data[2] |= CAN_ERR_PROT_STUFF; 296 break; 297 default: 298 break; 299 } 300 301 /* Error occurred during transmission? */ 302 if (!(ecc & SJA1000_ECC_DIR)) 303 cf->data[2] |= CAN_ERR_PROT_TX; 304 305 /* Bit stream position in CAN frame as the error was detected */ 306 cf->data[3] = ecc & SJA1000_ECC_SEG; 307 } 308 309 priv->bec.txerr = txerr; 310 priv->bec.rxerr = rxerr; 311 312 if (skb) { 313 cf->can_id |= CAN_ERR_CNT; 314 cf->data[6] = txerr; 315 cf->data[7] = rxerr; 316 317 netif_rx(skb); 318 } else { 319 stats->rx_dropped++; 320 } 321 } 322 } 323 324 static void esd_usb_rx_can_msg(struct esd_usb_net_priv *priv, 325 struct esd_usb_msg *msg) 326 { 327 struct net_device_stats *stats = &priv->netdev->stats; 328 struct can_frame *cf; 329 struct sk_buff *skb; 330 int i; 331 u32 id; 332 333 if (!netif_device_present(priv->netdev)) 334 return; 335 336 id = le32_to_cpu(msg->msg.rx.id); 337 338 if (id & ESD_EVENT) { 339 esd_usb_rx_event(priv, msg); 340 } else { 341 skb = alloc_can_skb(priv->netdev, &cf); 342 if (skb == NULL) { 343 stats->rx_dropped++; 344 return; 345 } 346 347 cf->can_id = id & ESD_IDMASK; 348 can_frame_set_cc_len(cf, msg->msg.rx.dlc & ~ESD_RTR, 349 priv->can.ctrlmode); 350 351 if (id & ESD_EXTID) 352 cf->can_id |= CAN_EFF_FLAG; 353 354 if (msg->msg.rx.dlc & ESD_RTR) { 355 cf->can_id |= CAN_RTR_FLAG; 356 } else { 357 for (i = 0; i < cf->len; i++) 358 cf->data[i] = msg->msg.rx.data[i]; 359 360 stats->rx_bytes += cf->len; 361 } 362 stats->rx_packets++; 363 364 netif_rx(skb); 365 } 366 } 367 368 static void esd_usb_tx_done_msg(struct esd_usb_net_priv *priv, 369 struct esd_usb_msg *msg) 370 { 371 struct net_device_stats *stats = &priv->netdev->stats; 372 struct net_device *netdev = priv->netdev; 373 struct esd_tx_urb_context *context; 374 375 if (!netif_device_present(netdev)) 376 return; 377 378 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)]; 379 380 if (!msg->msg.txdone.status) { 381 stats->tx_packets++; 382 stats->tx_bytes += can_get_echo_skb(netdev, context->echo_index, 383 NULL); 384 } else { 385 stats->tx_errors++; 386 can_free_echo_skb(netdev, context->echo_index, NULL); 387 } 388 389 /* Release context */ 390 context->echo_index = MAX_TX_URBS; 391 atomic_dec(&priv->active_tx_jobs); 392 393 netif_wake_queue(netdev); 394 } 395 396 static void esd_usb_read_bulk_callback(struct urb *urb) 397 { 398 struct esd_usb *dev = urb->context; 399 int retval; 400 int pos = 0; 401 int i; 402 403 switch (urb->status) { 404 case 0: /* success */ 405 break; 406 407 case -ENOENT: 408 case -EPIPE: 409 case -EPROTO: 410 case -ESHUTDOWN: 411 return; 412 413 default: 414 dev_info(dev->udev->dev.parent, 415 "Rx URB aborted (%d)\n", urb->status); 416 goto resubmit_urb; 417 } 418 419 while (pos < urb->actual_length) { 420 struct esd_usb_msg *msg; 421 422 msg = (struct esd_usb_msg *)(urb->transfer_buffer + pos); 423 424 switch (msg->msg.hdr.cmd) { 425 case CMD_CAN_RX: 426 if (msg->msg.rx.net >= dev->net_count) { 427 dev_err(dev->udev->dev.parent, "format error\n"); 428 break; 429 } 430 431 esd_usb_rx_can_msg(dev->nets[msg->msg.rx.net], msg); 432 break; 433 434 case CMD_CAN_TX: 435 if (msg->msg.txdone.net >= dev->net_count) { 436 dev_err(dev->udev->dev.parent, "format error\n"); 437 break; 438 } 439 440 esd_usb_tx_done_msg(dev->nets[msg->msg.txdone.net], 441 msg); 442 break; 443 } 444 445 pos += msg->msg.hdr.len << 2; 446 447 if (pos > urb->actual_length) { 448 dev_err(dev->udev->dev.parent, "format error\n"); 449 break; 450 } 451 } 452 453 resubmit_urb: 454 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), 455 urb->transfer_buffer, RX_BUFFER_SIZE, 456 esd_usb_read_bulk_callback, dev); 457 458 retval = usb_submit_urb(urb, GFP_ATOMIC); 459 if (retval == -ENODEV) { 460 for (i = 0; i < dev->net_count; i++) { 461 if (dev->nets[i]) 462 netif_device_detach(dev->nets[i]->netdev); 463 } 464 } else if (retval) { 465 dev_err(dev->udev->dev.parent, 466 "failed resubmitting read bulk urb: %d\n", retval); 467 } 468 } 469 470 /* callback for bulk IN urb */ 471 static void esd_usb_write_bulk_callback(struct urb *urb) 472 { 473 struct esd_tx_urb_context *context = urb->context; 474 struct esd_usb_net_priv *priv; 475 struct net_device *netdev; 476 size_t size = sizeof(struct esd_usb_msg); 477 478 WARN_ON(!context); 479 480 priv = context->priv; 481 netdev = priv->netdev; 482 483 /* free up our allocated buffer */ 484 usb_free_coherent(urb->dev, size, 485 urb->transfer_buffer, urb->transfer_dma); 486 487 if (!netif_device_present(netdev)) 488 return; 489 490 if (urb->status) 491 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); 492 493 netif_trans_update(netdev); 494 } 495 496 static ssize_t firmware_show(struct device *d, 497 struct device_attribute *attr, char *buf) 498 { 499 struct usb_interface *intf = to_usb_interface(d); 500 struct esd_usb *dev = usb_get_intfdata(intf); 501 502 return sprintf(buf, "%d.%d.%d\n", 503 (dev->version >> 12) & 0xf, 504 (dev->version >> 8) & 0xf, 505 dev->version & 0xff); 506 } 507 static DEVICE_ATTR_RO(firmware); 508 509 static ssize_t hardware_show(struct device *d, 510 struct device_attribute *attr, char *buf) 511 { 512 struct usb_interface *intf = to_usb_interface(d); 513 struct esd_usb *dev = usb_get_intfdata(intf); 514 515 return sprintf(buf, "%d.%d.%d\n", 516 (dev->version >> 28) & 0xf, 517 (dev->version >> 24) & 0xf, 518 (dev->version >> 16) & 0xff); 519 } 520 static DEVICE_ATTR_RO(hardware); 521 522 static ssize_t nets_show(struct device *d, 523 struct device_attribute *attr, char *buf) 524 { 525 struct usb_interface *intf = to_usb_interface(d); 526 struct esd_usb *dev = usb_get_intfdata(intf); 527 528 return sprintf(buf, "%d", dev->net_count); 529 } 530 static DEVICE_ATTR_RO(nets); 531 532 static int esd_usb_send_msg(struct esd_usb *dev, struct esd_usb_msg *msg) 533 { 534 int actual_length; 535 536 return usb_bulk_msg(dev->udev, 537 usb_sndbulkpipe(dev->udev, 2), 538 msg, 539 msg->msg.hdr.len << 2, 540 &actual_length, 541 1000); 542 } 543 544 static int esd_usb_wait_msg(struct esd_usb *dev, 545 struct esd_usb_msg *msg) 546 { 547 int actual_length; 548 549 return usb_bulk_msg(dev->udev, 550 usb_rcvbulkpipe(dev->udev, 1), 551 msg, 552 sizeof(*msg), 553 &actual_length, 554 1000); 555 } 556 557 static int esd_usb_setup_rx_urbs(struct esd_usb *dev) 558 { 559 int i, err = 0; 560 561 if (dev->rxinitdone) 562 return 0; 563 564 for (i = 0; i < MAX_RX_URBS; i++) { 565 struct urb *urb = NULL; 566 u8 *buf = NULL; 567 dma_addr_t buf_dma; 568 569 /* create a URB, and a buffer for it */ 570 urb = usb_alloc_urb(0, GFP_KERNEL); 571 if (!urb) { 572 err = -ENOMEM; 573 break; 574 } 575 576 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, 577 &buf_dma); 578 if (!buf) { 579 dev_warn(dev->udev->dev.parent, 580 "No memory left for USB buffer\n"); 581 err = -ENOMEM; 582 goto freeurb; 583 } 584 585 urb->transfer_dma = buf_dma; 586 587 usb_fill_bulk_urb(urb, dev->udev, 588 usb_rcvbulkpipe(dev->udev, 1), 589 buf, RX_BUFFER_SIZE, 590 esd_usb_read_bulk_callback, dev); 591 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 592 usb_anchor_urb(urb, &dev->rx_submitted); 593 594 err = usb_submit_urb(urb, GFP_KERNEL); 595 if (err) { 596 usb_unanchor_urb(urb); 597 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, 598 urb->transfer_dma); 599 goto freeurb; 600 } 601 602 dev->rxbuf[i] = buf; 603 dev->rxbuf_dma[i] = buf_dma; 604 605 freeurb: 606 /* Drop reference, USB core will take care of freeing it */ 607 usb_free_urb(urb); 608 if (err) 609 break; 610 } 611 612 /* Did we submit any URBs */ 613 if (i == 0) { 614 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); 615 return err; 616 } 617 618 /* Warn if we've couldn't transmit all the URBs */ 619 if (i < MAX_RX_URBS) { 620 dev_warn(dev->udev->dev.parent, 621 "rx performance may be slow\n"); 622 } 623 624 dev->rxinitdone = 1; 625 return 0; 626 } 627 628 /* Start interface */ 629 static int esd_usb_start(struct esd_usb_net_priv *priv) 630 { 631 struct esd_usb *dev = priv->usb; 632 struct net_device *netdev = priv->netdev; 633 struct esd_usb_msg *msg; 634 int err, i; 635 636 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 637 if (!msg) { 638 err = -ENOMEM; 639 goto out; 640 } 641 642 /* Enable all IDs 643 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). 644 * Each bit represents one 11 bit CAN identifier. A set bit 645 * enables reception of the corresponding CAN identifier. A cleared 646 * bit disabled this identifier. An additional bitmask value 647 * following the CAN 2.0A bits is used to enable reception of 648 * extended CAN frames. Only the LSB of this final mask is checked 649 * for the complete 29 bit ID range. The IDADD message also allows 650 * filter configuration for an ID subset. In this case you can add 651 * the number of the starting bitmask (0..64) to the filter.option 652 * field followed by only some bitmasks. 653 */ 654 msg->msg.hdr.cmd = CMD_IDADD; 655 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 656 msg->msg.filter.net = priv->index; 657 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 658 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) 659 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff); 660 /* enable 29bit extended IDs */ 661 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); 662 663 err = esd_usb_send_msg(dev, msg); 664 if (err) 665 goto out; 666 667 err = esd_usb_setup_rx_urbs(dev); 668 if (err) 669 goto out; 670 671 priv->can.state = CAN_STATE_ERROR_ACTIVE; 672 673 out: 674 if (err == -ENODEV) 675 netif_device_detach(netdev); 676 if (err) 677 netdev_err(netdev, "couldn't start device: %d\n", err); 678 679 kfree(msg); 680 return err; 681 } 682 683 static void unlink_all_urbs(struct esd_usb *dev) 684 { 685 struct esd_usb_net_priv *priv; 686 int i, j; 687 688 usb_kill_anchored_urbs(&dev->rx_submitted); 689 690 for (i = 0; i < MAX_RX_URBS; ++i) 691 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, 692 dev->rxbuf[i], dev->rxbuf_dma[i]); 693 694 for (i = 0; i < dev->net_count; i++) { 695 priv = dev->nets[i]; 696 if (priv) { 697 usb_kill_anchored_urbs(&priv->tx_submitted); 698 atomic_set(&priv->active_tx_jobs, 0); 699 700 for (j = 0; j < MAX_TX_URBS; j++) 701 priv->tx_contexts[j].echo_index = MAX_TX_URBS; 702 } 703 } 704 } 705 706 static int esd_usb_open(struct net_device *netdev) 707 { 708 struct esd_usb_net_priv *priv = netdev_priv(netdev); 709 int err; 710 711 /* common open */ 712 err = open_candev(netdev); 713 if (err) 714 return err; 715 716 /* finally start device */ 717 err = esd_usb_start(priv); 718 if (err) { 719 netdev_warn(netdev, "couldn't start device: %d\n", err); 720 close_candev(netdev); 721 return err; 722 } 723 724 netif_start_queue(netdev); 725 726 return 0; 727 } 728 729 static netdev_tx_t esd_usb_start_xmit(struct sk_buff *skb, 730 struct net_device *netdev) 731 { 732 struct esd_usb_net_priv *priv = netdev_priv(netdev); 733 struct esd_usb *dev = priv->usb; 734 struct esd_tx_urb_context *context = NULL; 735 struct net_device_stats *stats = &netdev->stats; 736 struct can_frame *cf = (struct can_frame *)skb->data; 737 struct esd_usb_msg *msg; 738 struct urb *urb; 739 u8 *buf; 740 int i, err; 741 int ret = NETDEV_TX_OK; 742 size_t size = sizeof(struct esd_usb_msg); 743 744 if (can_dev_dropped_skb(netdev, skb)) 745 return NETDEV_TX_OK; 746 747 /* create a URB, and a buffer for it, and copy the data to the URB */ 748 urb = usb_alloc_urb(0, GFP_ATOMIC); 749 if (!urb) { 750 stats->tx_dropped++; 751 dev_kfree_skb(skb); 752 goto nourbmem; 753 } 754 755 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, 756 &urb->transfer_dma); 757 if (!buf) { 758 netdev_err(netdev, "No memory left for USB buffer\n"); 759 stats->tx_dropped++; 760 dev_kfree_skb(skb); 761 goto nobufmem; 762 } 763 764 msg = (struct esd_usb_msg *)buf; 765 766 msg->msg.hdr.len = 3; /* minimal length */ 767 msg->msg.hdr.cmd = CMD_CAN_TX; 768 msg->msg.tx.net = priv->index; 769 msg->msg.tx.dlc = can_get_cc_dlc(cf, priv->can.ctrlmode); 770 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); 771 772 if (cf->can_id & CAN_RTR_FLAG) 773 msg->msg.tx.dlc |= ESD_RTR; 774 775 if (cf->can_id & CAN_EFF_FLAG) 776 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); 777 778 for (i = 0; i < cf->len; i++) 779 msg->msg.tx.data[i] = cf->data[i]; 780 781 msg->msg.hdr.len += (cf->len + 3) >> 2; 782 783 for (i = 0; i < MAX_TX_URBS; i++) { 784 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { 785 context = &priv->tx_contexts[i]; 786 break; 787 } 788 } 789 790 /* This may never happen */ 791 if (!context) { 792 netdev_warn(netdev, "couldn't find free context\n"); 793 ret = NETDEV_TX_BUSY; 794 goto releasebuf; 795 } 796 797 context->priv = priv; 798 context->echo_index = i; 799 800 /* hnd must not be 0 - MSB is stripped in txdone handling */ 801 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ 802 803 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, 804 msg->msg.hdr.len << 2, 805 esd_usb_write_bulk_callback, context); 806 807 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 808 809 usb_anchor_urb(urb, &priv->tx_submitted); 810 811 can_put_echo_skb(skb, netdev, context->echo_index, 0); 812 813 atomic_inc(&priv->active_tx_jobs); 814 815 /* Slow down tx path */ 816 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) 817 netif_stop_queue(netdev); 818 819 err = usb_submit_urb(urb, GFP_ATOMIC); 820 if (err) { 821 can_free_echo_skb(netdev, context->echo_index, NULL); 822 823 atomic_dec(&priv->active_tx_jobs); 824 usb_unanchor_urb(urb); 825 826 stats->tx_dropped++; 827 828 if (err == -ENODEV) 829 netif_device_detach(netdev); 830 else 831 netdev_warn(netdev, "failed tx_urb %d\n", err); 832 833 goto releasebuf; 834 } 835 836 netif_trans_update(netdev); 837 838 /* Release our reference to this URB, the USB core will eventually free 839 * it entirely. 840 */ 841 usb_free_urb(urb); 842 843 return NETDEV_TX_OK; 844 845 releasebuf: 846 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); 847 848 nobufmem: 849 usb_free_urb(urb); 850 851 nourbmem: 852 return ret; 853 } 854 855 static int esd_usb_close(struct net_device *netdev) 856 { 857 struct esd_usb_net_priv *priv = netdev_priv(netdev); 858 struct esd_usb_msg *msg; 859 int i; 860 861 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 862 if (!msg) 863 return -ENOMEM; 864 865 /* Disable all IDs (see esd_usb_start()) */ 866 msg->msg.hdr.cmd = CMD_IDADD; 867 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 868 msg->msg.filter.net = priv->index; 869 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 870 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) 871 msg->msg.filter.mask[i] = 0; 872 if (esd_usb_send_msg(priv->usb, msg) < 0) 873 netdev_err(netdev, "sending idadd message failed\n"); 874 875 /* set CAN controller to reset mode */ 876 msg->msg.hdr.len = 2; 877 msg->msg.hdr.cmd = CMD_SETBAUD; 878 msg->msg.setbaud.net = priv->index; 879 msg->msg.setbaud.rsvd = 0; 880 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB_NO_BAUDRATE); 881 if (esd_usb_send_msg(priv->usb, msg) < 0) 882 netdev_err(netdev, "sending setbaud message failed\n"); 883 884 priv->can.state = CAN_STATE_STOPPED; 885 886 netif_stop_queue(netdev); 887 888 close_candev(netdev); 889 890 kfree(msg); 891 892 return 0; 893 } 894 895 static const struct net_device_ops esd_usb_netdev_ops = { 896 .ndo_open = esd_usb_open, 897 .ndo_stop = esd_usb_close, 898 .ndo_start_xmit = esd_usb_start_xmit, 899 .ndo_change_mtu = can_change_mtu, 900 }; 901 902 static const struct ethtool_ops esd_usb_ethtool_ops = { 903 .get_ts_info = ethtool_op_get_ts_info, 904 }; 905 906 static const struct can_bittiming_const esd_usb2_bittiming_const = { 907 .name = "esd_usb2", 908 .tseg1_min = ESD_USB2_TSEG1_MIN, 909 .tseg1_max = ESD_USB2_TSEG1_MAX, 910 .tseg2_min = ESD_USB2_TSEG2_MIN, 911 .tseg2_max = ESD_USB2_TSEG2_MAX, 912 .sjw_max = ESD_USB2_SJW_MAX, 913 .brp_min = ESD_USB2_BRP_MIN, 914 .brp_max = ESD_USB2_BRP_MAX, 915 .brp_inc = ESD_USB2_BRP_INC, 916 }; 917 918 static int esd_usb2_set_bittiming(struct net_device *netdev) 919 { 920 struct esd_usb_net_priv *priv = netdev_priv(netdev); 921 struct can_bittiming *bt = &priv->can.bittiming; 922 struct esd_usb_msg *msg; 923 int err; 924 u32 canbtr; 925 int sjw_shift; 926 927 canbtr = ESD_USB_UBR; 928 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 929 canbtr |= ESD_USB_LOM; 930 931 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); 932 933 if (le16_to_cpu(priv->usb->udev->descriptor.idProduct) == 934 USB_CANUSBM_PRODUCT_ID) 935 sjw_shift = ESD_USBM_SJW_SHIFT; 936 else 937 sjw_shift = ESD_USB2_SJW_SHIFT; 938 939 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) 940 << sjw_shift; 941 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) 942 & (ESD_USB2_TSEG1_MAX - 1)) 943 << ESD_USB2_TSEG1_SHIFT; 944 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) 945 << ESD_USB2_TSEG2_SHIFT; 946 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 947 canbtr |= ESD_USB2_3_SAMPLES; 948 949 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 950 if (!msg) 951 return -ENOMEM; 952 953 msg->msg.hdr.len = 2; 954 msg->msg.hdr.cmd = CMD_SETBAUD; 955 msg->msg.setbaud.net = priv->index; 956 msg->msg.setbaud.rsvd = 0; 957 msg->msg.setbaud.baud = cpu_to_le32(canbtr); 958 959 netdev_info(netdev, "setting BTR=%#x\n", canbtr); 960 961 err = esd_usb_send_msg(priv->usb, msg); 962 963 kfree(msg); 964 return err; 965 } 966 967 static int esd_usb_get_berr_counter(const struct net_device *netdev, 968 struct can_berr_counter *bec) 969 { 970 struct esd_usb_net_priv *priv = netdev_priv(netdev); 971 972 bec->txerr = priv->bec.txerr; 973 bec->rxerr = priv->bec.rxerr; 974 975 return 0; 976 } 977 978 static int esd_usb_set_mode(struct net_device *netdev, enum can_mode mode) 979 { 980 switch (mode) { 981 case CAN_MODE_START: 982 netif_wake_queue(netdev); 983 break; 984 985 default: 986 return -EOPNOTSUPP; 987 } 988 989 return 0; 990 } 991 992 static int esd_usb_probe_one_net(struct usb_interface *intf, int index) 993 { 994 struct esd_usb *dev = usb_get_intfdata(intf); 995 struct net_device *netdev; 996 struct esd_usb_net_priv *priv; 997 int err = 0; 998 int i; 999 1000 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); 1001 if (!netdev) { 1002 dev_err(&intf->dev, "couldn't alloc candev\n"); 1003 err = -ENOMEM; 1004 goto done; 1005 } 1006 1007 priv = netdev_priv(netdev); 1008 1009 init_usb_anchor(&priv->tx_submitted); 1010 atomic_set(&priv->active_tx_jobs, 0); 1011 1012 for (i = 0; i < MAX_TX_URBS; i++) 1013 priv->tx_contexts[i].echo_index = MAX_TX_URBS; 1014 1015 priv->usb = dev; 1016 priv->netdev = netdev; 1017 priv->index = index; 1018 1019 priv->can.state = CAN_STATE_STOPPED; 1020 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY | 1021 CAN_CTRLMODE_CC_LEN8_DLC; 1022 1023 if (le16_to_cpu(dev->udev->descriptor.idProduct) == 1024 USB_CANUSBM_PRODUCT_ID) 1025 priv->can.clock.freq = ESD_USBM_CAN_CLOCK; 1026 else { 1027 priv->can.clock.freq = ESD_USB2_CAN_CLOCK; 1028 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES; 1029 } 1030 1031 priv->can.bittiming_const = &esd_usb2_bittiming_const; 1032 priv->can.do_set_bittiming = esd_usb2_set_bittiming; 1033 priv->can.do_set_mode = esd_usb_set_mode; 1034 priv->can.do_get_berr_counter = esd_usb_get_berr_counter; 1035 1036 netdev->flags |= IFF_ECHO; /* we support local echo */ 1037 1038 netdev->netdev_ops = &esd_usb_netdev_ops; 1039 netdev->ethtool_ops = &esd_usb_ethtool_ops; 1040 1041 SET_NETDEV_DEV(netdev, &intf->dev); 1042 netdev->dev_id = index; 1043 1044 err = register_candev(netdev); 1045 if (err) { 1046 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); 1047 free_candev(netdev); 1048 err = -ENOMEM; 1049 goto done; 1050 } 1051 1052 dev->nets[index] = priv; 1053 netdev_info(netdev, "device %s registered\n", netdev->name); 1054 1055 done: 1056 return err; 1057 } 1058 1059 /* probe function for new USB devices 1060 * 1061 * check version information and number of available 1062 * CAN interfaces 1063 */ 1064 static int esd_usb_probe(struct usb_interface *intf, 1065 const struct usb_device_id *id) 1066 { 1067 struct esd_usb *dev; 1068 struct esd_usb_msg *msg; 1069 int i, err; 1070 1071 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1072 if (!dev) { 1073 err = -ENOMEM; 1074 goto done; 1075 } 1076 1077 dev->udev = interface_to_usbdev(intf); 1078 1079 init_usb_anchor(&dev->rx_submitted); 1080 1081 usb_set_intfdata(intf, dev); 1082 1083 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 1084 if (!msg) { 1085 err = -ENOMEM; 1086 goto free_msg; 1087 } 1088 1089 /* query number of CAN interfaces (nets) */ 1090 msg->msg.hdr.cmd = CMD_VERSION; 1091 msg->msg.hdr.len = 2; 1092 msg->msg.version.rsvd = 0; 1093 msg->msg.version.flags = 0; 1094 msg->msg.version.drv_version = 0; 1095 1096 err = esd_usb_send_msg(dev, msg); 1097 if (err < 0) { 1098 dev_err(&intf->dev, "sending version message failed\n"); 1099 goto free_msg; 1100 } 1101 1102 err = esd_usb_wait_msg(dev, msg); 1103 if (err < 0) { 1104 dev_err(&intf->dev, "no version message answer\n"); 1105 goto free_msg; 1106 } 1107 1108 dev->net_count = (int)msg->msg.version_reply.nets; 1109 dev->version = le32_to_cpu(msg->msg.version_reply.version); 1110 1111 if (device_create_file(&intf->dev, &dev_attr_firmware)) 1112 dev_err(&intf->dev, 1113 "Couldn't create device file for firmware\n"); 1114 1115 if (device_create_file(&intf->dev, &dev_attr_hardware)) 1116 dev_err(&intf->dev, 1117 "Couldn't create device file for hardware\n"); 1118 1119 if (device_create_file(&intf->dev, &dev_attr_nets)) 1120 dev_err(&intf->dev, 1121 "Couldn't create device file for nets\n"); 1122 1123 /* do per device probing */ 1124 for (i = 0; i < dev->net_count; i++) 1125 esd_usb_probe_one_net(intf, i); 1126 1127 free_msg: 1128 kfree(msg); 1129 if (err) 1130 kfree(dev); 1131 done: 1132 return err; 1133 } 1134 1135 /* called by the usb core when the device is removed from the system */ 1136 static void esd_usb_disconnect(struct usb_interface *intf) 1137 { 1138 struct esd_usb *dev = usb_get_intfdata(intf); 1139 struct net_device *netdev; 1140 int i; 1141 1142 device_remove_file(&intf->dev, &dev_attr_firmware); 1143 device_remove_file(&intf->dev, &dev_attr_hardware); 1144 device_remove_file(&intf->dev, &dev_attr_nets); 1145 1146 usb_set_intfdata(intf, NULL); 1147 1148 if (dev) { 1149 for (i = 0; i < dev->net_count; i++) { 1150 if (dev->nets[i]) { 1151 netdev = dev->nets[i]->netdev; 1152 unregister_netdev(netdev); 1153 free_candev(netdev); 1154 } 1155 } 1156 unlink_all_urbs(dev); 1157 kfree(dev); 1158 } 1159 } 1160 1161 /* usb specific object needed to register this driver with the usb subsystem */ 1162 static struct usb_driver esd_usb_driver = { 1163 .name = KBUILD_MODNAME, 1164 .probe = esd_usb_probe, 1165 .disconnect = esd_usb_disconnect, 1166 .id_table = esd_usb_table, 1167 }; 1168 1169 module_usb_driver(esd_usb_driver); 1170