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 union __packed esd_usb_msg { 178 struct header_msg hdr; 179 struct version_msg version; 180 struct version_reply_msg version_reply; 181 struct rx_msg rx; 182 struct tx_msg tx; 183 struct tx_done_msg txdone; 184 struct set_baudrate_msg setbaud; 185 struct id_filter_msg filter; 186 }; 187 188 static struct usb_device_id esd_usb_table[] = { 189 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)}, 190 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSBM_PRODUCT_ID)}, 191 {} 192 }; 193 MODULE_DEVICE_TABLE(usb, esd_usb_table); 194 195 struct esd_usb_net_priv; 196 197 struct esd_tx_urb_context { 198 struct esd_usb_net_priv *priv; 199 u32 echo_index; 200 }; 201 202 struct esd_usb { 203 struct usb_device *udev; 204 struct esd_usb_net_priv *nets[ESD_USB_MAX_NETS]; 205 206 struct usb_anchor rx_submitted; 207 208 int net_count; 209 u32 version; 210 int rxinitdone; 211 void *rxbuf[MAX_RX_URBS]; 212 dma_addr_t rxbuf_dma[MAX_RX_URBS]; 213 }; 214 215 struct esd_usb_net_priv { 216 struct can_priv can; /* must be the first member */ 217 218 atomic_t active_tx_jobs; 219 struct usb_anchor tx_submitted; 220 struct esd_tx_urb_context tx_contexts[MAX_TX_URBS]; 221 222 struct esd_usb *usb; 223 struct net_device *netdev; 224 int index; 225 u8 old_state; 226 struct can_berr_counter bec; 227 }; 228 229 static void esd_usb_rx_event(struct esd_usb_net_priv *priv, 230 union esd_usb_msg *msg) 231 { 232 struct net_device_stats *stats = &priv->netdev->stats; 233 struct can_frame *cf; 234 struct sk_buff *skb; 235 u32 id = le32_to_cpu(msg->rx.id) & ESD_IDMASK; 236 237 if (id == ESD_EV_CAN_ERROR_EXT) { 238 u8 state = msg->rx.ev_can_err_ext.status; 239 u8 ecc = msg->rx.ev_can_err_ext.ecc; 240 241 priv->bec.rxerr = msg->rx.ev_can_err_ext.rec; 242 priv->bec.txerr = msg->rx.ev_can_err_ext.tec; 243 244 netdev_dbg(priv->netdev, 245 "CAN_ERR_EV_EXT: dlc=%#02x state=%02x ecc=%02x rec=%02x tec=%02x\n", 246 msg->rx.dlc, state, ecc, 247 priv->bec.rxerr, priv->bec.txerr); 248 249 /* if berr-reporting is off, only pass through on state change ... */ 250 if (!(priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) && 251 state == priv->old_state) 252 return; 253 254 skb = alloc_can_err_skb(priv->netdev, &cf); 255 if (!skb) 256 stats->rx_dropped++; 257 258 if (state != priv->old_state) { 259 enum can_state tx_state, rx_state; 260 enum can_state new_state = CAN_STATE_ERROR_ACTIVE; 261 262 priv->old_state = state; 263 264 switch (state & ESD_BUSSTATE_MASK) { 265 case ESD_BUSSTATE_BUSOFF: 266 new_state = CAN_STATE_BUS_OFF; 267 can_bus_off(priv->netdev); 268 break; 269 case ESD_BUSSTATE_WARN: 270 new_state = CAN_STATE_ERROR_WARNING; 271 break; 272 case ESD_BUSSTATE_ERRPASSIVE: 273 new_state = CAN_STATE_ERROR_PASSIVE; 274 break; 275 default: 276 new_state = CAN_STATE_ERROR_ACTIVE; 277 priv->bec.txerr = 0; 278 priv->bec.rxerr = 0; 279 break; 280 } 281 282 if (new_state != priv->can.state) { 283 tx_state = (priv->bec.txerr >= priv->bec.rxerr) ? new_state : 0; 284 rx_state = (priv->bec.txerr <= priv->bec.rxerr) ? new_state : 0; 285 can_change_state(priv->netdev, cf, 286 tx_state, rx_state); 287 } 288 } else if (skb) { 289 priv->can.can_stats.bus_error++; 290 stats->rx_errors++; 291 292 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 293 294 switch (ecc & SJA1000_ECC_MASK) { 295 case SJA1000_ECC_BIT: 296 cf->data[2] |= CAN_ERR_PROT_BIT; 297 break; 298 case SJA1000_ECC_FORM: 299 cf->data[2] |= CAN_ERR_PROT_FORM; 300 break; 301 case SJA1000_ECC_STUFF: 302 cf->data[2] |= CAN_ERR_PROT_STUFF; 303 break; 304 default: 305 break; 306 } 307 308 /* Error occurred during transmission? */ 309 if (!(ecc & SJA1000_ECC_DIR)) 310 cf->data[2] |= CAN_ERR_PROT_TX; 311 312 /* Bit stream position in CAN frame as the error was detected */ 313 cf->data[3] = ecc & SJA1000_ECC_SEG; 314 } 315 316 if (skb) { 317 cf->can_id |= CAN_ERR_CNT; 318 cf->data[6] = priv->bec.txerr; 319 cf->data[7] = priv->bec.rxerr; 320 321 netif_rx(skb); 322 } 323 } 324 } 325 326 static void esd_usb_rx_can_msg(struct esd_usb_net_priv *priv, 327 union esd_usb_msg *msg) 328 { 329 struct net_device_stats *stats = &priv->netdev->stats; 330 struct can_frame *cf; 331 struct sk_buff *skb; 332 int i; 333 u32 id; 334 335 if (!netif_device_present(priv->netdev)) 336 return; 337 338 id = le32_to_cpu(msg->rx.id); 339 340 if (id & ESD_EVENT) { 341 esd_usb_rx_event(priv, msg); 342 } else { 343 skb = alloc_can_skb(priv->netdev, &cf); 344 if (skb == NULL) { 345 stats->rx_dropped++; 346 return; 347 } 348 349 cf->can_id = id & ESD_IDMASK; 350 can_frame_set_cc_len(cf, msg->rx.dlc & ~ESD_RTR, 351 priv->can.ctrlmode); 352 353 if (id & ESD_EXTID) 354 cf->can_id |= CAN_EFF_FLAG; 355 356 if (msg->rx.dlc & ESD_RTR) { 357 cf->can_id |= CAN_RTR_FLAG; 358 } else { 359 for (i = 0; i < cf->len; i++) 360 cf->data[i] = msg->rx.data[i]; 361 362 stats->rx_bytes += cf->len; 363 } 364 stats->rx_packets++; 365 366 netif_rx(skb); 367 } 368 } 369 370 static void esd_usb_tx_done_msg(struct esd_usb_net_priv *priv, 371 union esd_usb_msg *msg) 372 { 373 struct net_device_stats *stats = &priv->netdev->stats; 374 struct net_device *netdev = priv->netdev; 375 struct esd_tx_urb_context *context; 376 377 if (!netif_device_present(netdev)) 378 return; 379 380 context = &priv->tx_contexts[msg->txdone.hnd & (MAX_TX_URBS - 1)]; 381 382 if (!msg->txdone.status) { 383 stats->tx_packets++; 384 stats->tx_bytes += can_get_echo_skb(netdev, context->echo_index, 385 NULL); 386 } else { 387 stats->tx_errors++; 388 can_free_echo_skb(netdev, context->echo_index, NULL); 389 } 390 391 /* Release context */ 392 context->echo_index = MAX_TX_URBS; 393 atomic_dec(&priv->active_tx_jobs); 394 395 netif_wake_queue(netdev); 396 } 397 398 static void esd_usb_read_bulk_callback(struct urb *urb) 399 { 400 struct esd_usb *dev = urb->context; 401 int retval; 402 int pos = 0; 403 int i; 404 405 switch (urb->status) { 406 case 0: /* success */ 407 break; 408 409 case -ENOENT: 410 case -EPIPE: 411 case -EPROTO: 412 case -ESHUTDOWN: 413 return; 414 415 default: 416 dev_info(dev->udev->dev.parent, 417 "Rx URB aborted (%d)\n", urb->status); 418 goto resubmit_urb; 419 } 420 421 while (pos < urb->actual_length) { 422 union esd_usb_msg *msg; 423 424 msg = (union esd_usb_msg *)(urb->transfer_buffer + pos); 425 426 switch (msg->hdr.cmd) { 427 case CMD_CAN_RX: 428 if (msg->rx.net >= dev->net_count) { 429 dev_err(dev->udev->dev.parent, "format error\n"); 430 break; 431 } 432 433 esd_usb_rx_can_msg(dev->nets[msg->rx.net], msg); 434 break; 435 436 case CMD_CAN_TX: 437 if (msg->txdone.net >= dev->net_count) { 438 dev_err(dev->udev->dev.parent, "format error\n"); 439 break; 440 } 441 442 esd_usb_tx_done_msg(dev->nets[msg->txdone.net], 443 msg); 444 break; 445 } 446 447 pos += msg->hdr.len << 2; 448 449 if (pos > urb->actual_length) { 450 dev_err(dev->udev->dev.parent, "format error\n"); 451 break; 452 } 453 } 454 455 resubmit_urb: 456 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), 457 urb->transfer_buffer, RX_BUFFER_SIZE, 458 esd_usb_read_bulk_callback, dev); 459 460 retval = usb_submit_urb(urb, GFP_ATOMIC); 461 if (retval == -ENODEV) { 462 for (i = 0; i < dev->net_count; i++) { 463 if (dev->nets[i]) 464 netif_device_detach(dev->nets[i]->netdev); 465 } 466 } else if (retval) { 467 dev_err(dev->udev->dev.parent, 468 "failed resubmitting read bulk urb: %d\n", retval); 469 } 470 } 471 472 /* callback for bulk IN urb */ 473 static void esd_usb_write_bulk_callback(struct urb *urb) 474 { 475 struct esd_tx_urb_context *context = urb->context; 476 struct esd_usb_net_priv *priv; 477 struct net_device *netdev; 478 size_t size = sizeof(union esd_usb_msg); 479 480 WARN_ON(!context); 481 482 priv = context->priv; 483 netdev = priv->netdev; 484 485 /* free up our allocated buffer */ 486 usb_free_coherent(urb->dev, size, 487 urb->transfer_buffer, urb->transfer_dma); 488 489 if (!netif_device_present(netdev)) 490 return; 491 492 if (urb->status) 493 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); 494 495 netif_trans_update(netdev); 496 } 497 498 static ssize_t firmware_show(struct device *d, 499 struct device_attribute *attr, char *buf) 500 { 501 struct usb_interface *intf = to_usb_interface(d); 502 struct esd_usb *dev = usb_get_intfdata(intf); 503 504 return sprintf(buf, "%d.%d.%d\n", 505 (dev->version >> 12) & 0xf, 506 (dev->version >> 8) & 0xf, 507 dev->version & 0xff); 508 } 509 static DEVICE_ATTR_RO(firmware); 510 511 static ssize_t hardware_show(struct device *d, 512 struct device_attribute *attr, char *buf) 513 { 514 struct usb_interface *intf = to_usb_interface(d); 515 struct esd_usb *dev = usb_get_intfdata(intf); 516 517 return sprintf(buf, "%d.%d.%d\n", 518 (dev->version >> 28) & 0xf, 519 (dev->version >> 24) & 0xf, 520 (dev->version >> 16) & 0xff); 521 } 522 static DEVICE_ATTR_RO(hardware); 523 524 static ssize_t nets_show(struct device *d, 525 struct device_attribute *attr, char *buf) 526 { 527 struct usb_interface *intf = to_usb_interface(d); 528 struct esd_usb *dev = usb_get_intfdata(intf); 529 530 return sprintf(buf, "%d", dev->net_count); 531 } 532 static DEVICE_ATTR_RO(nets); 533 534 static int esd_usb_send_msg(struct esd_usb *dev, union esd_usb_msg *msg) 535 { 536 int actual_length; 537 538 return usb_bulk_msg(dev->udev, 539 usb_sndbulkpipe(dev->udev, 2), 540 msg, 541 msg->hdr.len << 2, 542 &actual_length, 543 1000); 544 } 545 546 static int esd_usb_wait_msg(struct esd_usb *dev, 547 union esd_usb_msg *msg) 548 { 549 int actual_length; 550 551 return usb_bulk_msg(dev->udev, 552 usb_rcvbulkpipe(dev->udev, 1), 553 msg, 554 sizeof(*msg), 555 &actual_length, 556 1000); 557 } 558 559 static int esd_usb_setup_rx_urbs(struct esd_usb *dev) 560 { 561 int i, err = 0; 562 563 if (dev->rxinitdone) 564 return 0; 565 566 for (i = 0; i < MAX_RX_URBS; i++) { 567 struct urb *urb = NULL; 568 u8 *buf = NULL; 569 dma_addr_t buf_dma; 570 571 /* create a URB, and a buffer for it */ 572 urb = usb_alloc_urb(0, GFP_KERNEL); 573 if (!urb) { 574 err = -ENOMEM; 575 break; 576 } 577 578 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, 579 &buf_dma); 580 if (!buf) { 581 dev_warn(dev->udev->dev.parent, 582 "No memory left for USB buffer\n"); 583 err = -ENOMEM; 584 goto freeurb; 585 } 586 587 urb->transfer_dma = buf_dma; 588 589 usb_fill_bulk_urb(urb, dev->udev, 590 usb_rcvbulkpipe(dev->udev, 1), 591 buf, RX_BUFFER_SIZE, 592 esd_usb_read_bulk_callback, dev); 593 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 594 usb_anchor_urb(urb, &dev->rx_submitted); 595 596 err = usb_submit_urb(urb, GFP_KERNEL); 597 if (err) { 598 usb_unanchor_urb(urb); 599 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, 600 urb->transfer_dma); 601 goto freeurb; 602 } 603 604 dev->rxbuf[i] = buf; 605 dev->rxbuf_dma[i] = buf_dma; 606 607 freeurb: 608 /* Drop reference, USB core will take care of freeing it */ 609 usb_free_urb(urb); 610 if (err) 611 break; 612 } 613 614 /* Did we submit any URBs */ 615 if (i == 0) { 616 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); 617 return err; 618 } 619 620 /* Warn if we've couldn't transmit all the URBs */ 621 if (i < MAX_RX_URBS) { 622 dev_warn(dev->udev->dev.parent, 623 "rx performance may be slow\n"); 624 } 625 626 dev->rxinitdone = 1; 627 return 0; 628 } 629 630 /* Start interface */ 631 static int esd_usb_start(struct esd_usb_net_priv *priv) 632 { 633 struct esd_usb *dev = priv->usb; 634 struct net_device *netdev = priv->netdev; 635 union esd_usb_msg *msg; 636 int err, i; 637 638 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 639 if (!msg) { 640 err = -ENOMEM; 641 goto out; 642 } 643 644 /* Enable all IDs 645 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). 646 * Each bit represents one 11 bit CAN identifier. A set bit 647 * enables reception of the corresponding CAN identifier. A cleared 648 * bit disabled this identifier. An additional bitmask value 649 * following the CAN 2.0A bits is used to enable reception of 650 * extended CAN frames. Only the LSB of this final mask is checked 651 * for the complete 29 bit ID range. The IDADD message also allows 652 * filter configuration for an ID subset. In this case you can add 653 * the number of the starting bitmask (0..64) to the filter.option 654 * field followed by only some bitmasks. 655 */ 656 msg->hdr.cmd = CMD_IDADD; 657 msg->hdr.len = 2 + ESD_MAX_ID_SEGMENT; 658 msg->filter.net = priv->index; 659 msg->filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 660 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) 661 msg->filter.mask[i] = cpu_to_le32(0xffffffff); 662 /* enable 29bit extended IDs */ 663 msg->filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); 664 665 err = esd_usb_send_msg(dev, msg); 666 if (err) 667 goto out; 668 669 err = esd_usb_setup_rx_urbs(dev); 670 if (err) 671 goto out; 672 673 priv->can.state = CAN_STATE_ERROR_ACTIVE; 674 675 out: 676 if (err == -ENODEV) 677 netif_device_detach(netdev); 678 if (err) 679 netdev_err(netdev, "couldn't start device: %d\n", err); 680 681 kfree(msg); 682 return err; 683 } 684 685 static void unlink_all_urbs(struct esd_usb *dev) 686 { 687 struct esd_usb_net_priv *priv; 688 int i, j; 689 690 usb_kill_anchored_urbs(&dev->rx_submitted); 691 692 for (i = 0; i < MAX_RX_URBS; ++i) 693 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, 694 dev->rxbuf[i], dev->rxbuf_dma[i]); 695 696 for (i = 0; i < dev->net_count; i++) { 697 priv = dev->nets[i]; 698 if (priv) { 699 usb_kill_anchored_urbs(&priv->tx_submitted); 700 atomic_set(&priv->active_tx_jobs, 0); 701 702 for (j = 0; j < MAX_TX_URBS; j++) 703 priv->tx_contexts[j].echo_index = MAX_TX_URBS; 704 } 705 } 706 } 707 708 static int esd_usb_open(struct net_device *netdev) 709 { 710 struct esd_usb_net_priv *priv = netdev_priv(netdev); 711 int err; 712 713 /* common open */ 714 err = open_candev(netdev); 715 if (err) 716 return err; 717 718 /* finally start device */ 719 err = esd_usb_start(priv); 720 if (err) { 721 netdev_warn(netdev, "couldn't start device: %d\n", err); 722 close_candev(netdev); 723 return err; 724 } 725 726 netif_start_queue(netdev); 727 728 return 0; 729 } 730 731 static netdev_tx_t esd_usb_start_xmit(struct sk_buff *skb, 732 struct net_device *netdev) 733 { 734 struct esd_usb_net_priv *priv = netdev_priv(netdev); 735 struct esd_usb *dev = priv->usb; 736 struct esd_tx_urb_context *context = NULL; 737 struct net_device_stats *stats = &netdev->stats; 738 struct can_frame *cf = (struct can_frame *)skb->data; 739 union esd_usb_msg *msg; 740 struct urb *urb; 741 u8 *buf; 742 int i, err; 743 int ret = NETDEV_TX_OK; 744 size_t size = sizeof(union esd_usb_msg); 745 746 if (can_dev_dropped_skb(netdev, skb)) 747 return NETDEV_TX_OK; 748 749 /* create a URB, and a buffer for it, and copy the data to the URB */ 750 urb = usb_alloc_urb(0, GFP_ATOMIC); 751 if (!urb) { 752 stats->tx_dropped++; 753 dev_kfree_skb(skb); 754 goto nourbmem; 755 } 756 757 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, 758 &urb->transfer_dma); 759 if (!buf) { 760 netdev_err(netdev, "No memory left for USB buffer\n"); 761 stats->tx_dropped++; 762 dev_kfree_skb(skb); 763 goto nobufmem; 764 } 765 766 msg = (union esd_usb_msg *)buf; 767 768 msg->hdr.len = 3; /* minimal length */ 769 msg->hdr.cmd = CMD_CAN_TX; 770 msg->tx.net = priv->index; 771 msg->tx.dlc = can_get_cc_dlc(cf, priv->can.ctrlmode); 772 msg->tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); 773 774 if (cf->can_id & CAN_RTR_FLAG) 775 msg->tx.dlc |= ESD_RTR; 776 777 if (cf->can_id & CAN_EFF_FLAG) 778 msg->tx.id |= cpu_to_le32(ESD_EXTID); 779 780 for (i = 0; i < cf->len; i++) 781 msg->tx.data[i] = cf->data[i]; 782 783 msg->hdr.len += (cf->len + 3) >> 2; 784 785 for (i = 0; i < MAX_TX_URBS; i++) { 786 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { 787 context = &priv->tx_contexts[i]; 788 break; 789 } 790 } 791 792 /* This may never happen */ 793 if (!context) { 794 netdev_warn(netdev, "couldn't find free context\n"); 795 ret = NETDEV_TX_BUSY; 796 goto releasebuf; 797 } 798 799 context->priv = priv; 800 context->echo_index = i; 801 802 /* hnd must not be 0 - MSB is stripped in txdone handling */ 803 msg->tx.hnd = 0x80000000 | i; /* returned in TX done message */ 804 805 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, 806 msg->hdr.len << 2, 807 esd_usb_write_bulk_callback, context); 808 809 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 810 811 usb_anchor_urb(urb, &priv->tx_submitted); 812 813 can_put_echo_skb(skb, netdev, context->echo_index, 0); 814 815 atomic_inc(&priv->active_tx_jobs); 816 817 /* Slow down tx path */ 818 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) 819 netif_stop_queue(netdev); 820 821 err = usb_submit_urb(urb, GFP_ATOMIC); 822 if (err) { 823 can_free_echo_skb(netdev, context->echo_index, NULL); 824 825 atomic_dec(&priv->active_tx_jobs); 826 usb_unanchor_urb(urb); 827 828 stats->tx_dropped++; 829 830 if (err == -ENODEV) 831 netif_device_detach(netdev); 832 else 833 netdev_warn(netdev, "failed tx_urb %d\n", err); 834 835 goto releasebuf; 836 } 837 838 netif_trans_update(netdev); 839 840 /* Release our reference to this URB, the USB core will eventually free 841 * it entirely. 842 */ 843 usb_free_urb(urb); 844 845 return NETDEV_TX_OK; 846 847 releasebuf: 848 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); 849 850 nobufmem: 851 usb_free_urb(urb); 852 853 nourbmem: 854 return ret; 855 } 856 857 static int esd_usb_close(struct net_device *netdev) 858 { 859 struct esd_usb_net_priv *priv = netdev_priv(netdev); 860 union esd_usb_msg *msg; 861 int i; 862 863 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 864 if (!msg) 865 return -ENOMEM; 866 867 /* Disable all IDs (see esd_usb_start()) */ 868 msg->hdr.cmd = CMD_IDADD; 869 msg->hdr.len = 2 + ESD_MAX_ID_SEGMENT; 870 msg->filter.net = priv->index; 871 msg->filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 872 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) 873 msg->filter.mask[i] = 0; 874 if (esd_usb_send_msg(priv->usb, msg) < 0) 875 netdev_err(netdev, "sending idadd message failed\n"); 876 877 /* set CAN controller to reset mode */ 878 msg->hdr.len = 2; 879 msg->hdr.cmd = CMD_SETBAUD; 880 msg->setbaud.net = priv->index; 881 msg->setbaud.rsvd = 0; 882 msg->setbaud.baud = cpu_to_le32(ESD_USB_NO_BAUDRATE); 883 if (esd_usb_send_msg(priv->usb, msg) < 0) 884 netdev_err(netdev, "sending setbaud message failed\n"); 885 886 priv->can.state = CAN_STATE_STOPPED; 887 888 netif_stop_queue(netdev); 889 890 close_candev(netdev); 891 892 kfree(msg); 893 894 return 0; 895 } 896 897 static const struct net_device_ops esd_usb_netdev_ops = { 898 .ndo_open = esd_usb_open, 899 .ndo_stop = esd_usb_close, 900 .ndo_start_xmit = esd_usb_start_xmit, 901 .ndo_change_mtu = can_change_mtu, 902 }; 903 904 static const struct ethtool_ops esd_usb_ethtool_ops = { 905 .get_ts_info = ethtool_op_get_ts_info, 906 }; 907 908 static const struct can_bittiming_const esd_usb2_bittiming_const = { 909 .name = "esd_usb2", 910 .tseg1_min = ESD_USB2_TSEG1_MIN, 911 .tseg1_max = ESD_USB2_TSEG1_MAX, 912 .tseg2_min = ESD_USB2_TSEG2_MIN, 913 .tseg2_max = ESD_USB2_TSEG2_MAX, 914 .sjw_max = ESD_USB2_SJW_MAX, 915 .brp_min = ESD_USB2_BRP_MIN, 916 .brp_max = ESD_USB2_BRP_MAX, 917 .brp_inc = ESD_USB2_BRP_INC, 918 }; 919 920 static int esd_usb2_set_bittiming(struct net_device *netdev) 921 { 922 struct esd_usb_net_priv *priv = netdev_priv(netdev); 923 struct can_bittiming *bt = &priv->can.bittiming; 924 union esd_usb_msg *msg; 925 int err; 926 u32 canbtr; 927 int sjw_shift; 928 929 canbtr = ESD_USB_UBR; 930 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 931 canbtr |= ESD_USB_LOM; 932 933 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); 934 935 if (le16_to_cpu(priv->usb->udev->descriptor.idProduct) == 936 USB_CANUSBM_PRODUCT_ID) 937 sjw_shift = ESD_USBM_SJW_SHIFT; 938 else 939 sjw_shift = ESD_USB2_SJW_SHIFT; 940 941 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) 942 << sjw_shift; 943 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) 944 & (ESD_USB2_TSEG1_MAX - 1)) 945 << ESD_USB2_TSEG1_SHIFT; 946 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) 947 << ESD_USB2_TSEG2_SHIFT; 948 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 949 canbtr |= ESD_USB2_3_SAMPLES; 950 951 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 952 if (!msg) 953 return -ENOMEM; 954 955 msg->hdr.len = 2; 956 msg->hdr.cmd = CMD_SETBAUD; 957 msg->setbaud.net = priv->index; 958 msg->setbaud.rsvd = 0; 959 msg->setbaud.baud = cpu_to_le32(canbtr); 960 961 netdev_info(netdev, "setting BTR=%#x\n", canbtr); 962 963 err = esd_usb_send_msg(priv->usb, msg); 964 965 kfree(msg); 966 return err; 967 } 968 969 static int esd_usb_get_berr_counter(const struct net_device *netdev, 970 struct can_berr_counter *bec) 971 { 972 struct esd_usb_net_priv *priv = netdev_priv(netdev); 973 974 bec->txerr = priv->bec.txerr; 975 bec->rxerr = priv->bec.rxerr; 976 977 return 0; 978 } 979 980 static int esd_usb_set_mode(struct net_device *netdev, enum can_mode mode) 981 { 982 switch (mode) { 983 case CAN_MODE_START: 984 netif_wake_queue(netdev); 985 break; 986 987 default: 988 return -EOPNOTSUPP; 989 } 990 991 return 0; 992 } 993 994 static int esd_usb_probe_one_net(struct usb_interface *intf, int index) 995 { 996 struct esd_usb *dev = usb_get_intfdata(intf); 997 struct net_device *netdev; 998 struct esd_usb_net_priv *priv; 999 int err = 0; 1000 int i; 1001 1002 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); 1003 if (!netdev) { 1004 dev_err(&intf->dev, "couldn't alloc candev\n"); 1005 err = -ENOMEM; 1006 goto done; 1007 } 1008 1009 priv = netdev_priv(netdev); 1010 1011 init_usb_anchor(&priv->tx_submitted); 1012 atomic_set(&priv->active_tx_jobs, 0); 1013 1014 for (i = 0; i < MAX_TX_URBS; i++) 1015 priv->tx_contexts[i].echo_index = MAX_TX_URBS; 1016 1017 priv->usb = dev; 1018 priv->netdev = netdev; 1019 priv->index = index; 1020 1021 priv->can.state = CAN_STATE_STOPPED; 1022 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY | 1023 CAN_CTRLMODE_CC_LEN8_DLC | 1024 CAN_CTRLMODE_BERR_REPORTING; 1025 1026 if (le16_to_cpu(dev->udev->descriptor.idProduct) == 1027 USB_CANUSBM_PRODUCT_ID) 1028 priv->can.clock.freq = ESD_USBM_CAN_CLOCK; 1029 else { 1030 priv->can.clock.freq = ESD_USB2_CAN_CLOCK; 1031 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES; 1032 } 1033 1034 priv->can.bittiming_const = &esd_usb2_bittiming_const; 1035 priv->can.do_set_bittiming = esd_usb2_set_bittiming; 1036 priv->can.do_set_mode = esd_usb_set_mode; 1037 priv->can.do_get_berr_counter = esd_usb_get_berr_counter; 1038 1039 netdev->flags |= IFF_ECHO; /* we support local echo */ 1040 1041 netdev->netdev_ops = &esd_usb_netdev_ops; 1042 netdev->ethtool_ops = &esd_usb_ethtool_ops; 1043 1044 SET_NETDEV_DEV(netdev, &intf->dev); 1045 netdev->dev_id = index; 1046 1047 err = register_candev(netdev); 1048 if (err) { 1049 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); 1050 free_candev(netdev); 1051 err = -ENOMEM; 1052 goto done; 1053 } 1054 1055 dev->nets[index] = priv; 1056 netdev_info(netdev, "device %s registered\n", netdev->name); 1057 1058 done: 1059 return err; 1060 } 1061 1062 /* probe function for new USB devices 1063 * 1064 * check version information and number of available 1065 * CAN interfaces 1066 */ 1067 static int esd_usb_probe(struct usb_interface *intf, 1068 const struct usb_device_id *id) 1069 { 1070 struct esd_usb *dev; 1071 union esd_usb_msg *msg; 1072 int i, err; 1073 1074 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1075 if (!dev) { 1076 err = -ENOMEM; 1077 goto done; 1078 } 1079 1080 dev->udev = interface_to_usbdev(intf); 1081 1082 init_usb_anchor(&dev->rx_submitted); 1083 1084 usb_set_intfdata(intf, dev); 1085 1086 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 1087 if (!msg) { 1088 err = -ENOMEM; 1089 goto free_msg; 1090 } 1091 1092 /* query number of CAN interfaces (nets) */ 1093 msg->hdr.cmd = CMD_VERSION; 1094 msg->hdr.len = 2; 1095 msg->version.rsvd = 0; 1096 msg->version.flags = 0; 1097 msg->version.drv_version = 0; 1098 1099 err = esd_usb_send_msg(dev, msg); 1100 if (err < 0) { 1101 dev_err(&intf->dev, "sending version message failed\n"); 1102 goto free_msg; 1103 } 1104 1105 err = esd_usb_wait_msg(dev, msg); 1106 if (err < 0) { 1107 dev_err(&intf->dev, "no version message answer\n"); 1108 goto free_msg; 1109 } 1110 1111 dev->net_count = (int)msg->version_reply.nets; 1112 dev->version = le32_to_cpu(msg->version_reply.version); 1113 1114 if (device_create_file(&intf->dev, &dev_attr_firmware)) 1115 dev_err(&intf->dev, 1116 "Couldn't create device file for firmware\n"); 1117 1118 if (device_create_file(&intf->dev, &dev_attr_hardware)) 1119 dev_err(&intf->dev, 1120 "Couldn't create device file for hardware\n"); 1121 1122 if (device_create_file(&intf->dev, &dev_attr_nets)) 1123 dev_err(&intf->dev, 1124 "Couldn't create device file for nets\n"); 1125 1126 /* do per device probing */ 1127 for (i = 0; i < dev->net_count; i++) 1128 esd_usb_probe_one_net(intf, i); 1129 1130 free_msg: 1131 kfree(msg); 1132 if (err) 1133 kfree(dev); 1134 done: 1135 return err; 1136 } 1137 1138 /* called by the usb core when the device is removed from the system */ 1139 static void esd_usb_disconnect(struct usb_interface *intf) 1140 { 1141 struct esd_usb *dev = usb_get_intfdata(intf); 1142 struct net_device *netdev; 1143 int i; 1144 1145 device_remove_file(&intf->dev, &dev_attr_firmware); 1146 device_remove_file(&intf->dev, &dev_attr_hardware); 1147 device_remove_file(&intf->dev, &dev_attr_nets); 1148 1149 usb_set_intfdata(intf, NULL); 1150 1151 if (dev) { 1152 for (i = 0; i < dev->net_count; i++) { 1153 if (dev->nets[i]) { 1154 netdev = dev->nets[i]->netdev; 1155 unregister_netdev(netdev); 1156 free_candev(netdev); 1157 } 1158 } 1159 unlink_all_urbs(dev); 1160 kfree(dev); 1161 } 1162 } 1163 1164 /* usb specific object needed to register this driver with the usb subsystem */ 1165 static struct usb_driver esd_usb_driver = { 1166 .name = KBUILD_MODNAME, 1167 .probe = esd_usb_probe, 1168 .disconnect = esd_usb_disconnect, 1169 .id_table = esd_usb_table, 1170 }; 1171 1172 module_usb_driver(esd_usb_driver); 1173