1 /* 2 * CAN driver for PEAK System PCAN-USB adapter 3 * Derived from the PCAN project file driver/src/pcan_usb.c 4 * 5 * Copyright (C) 2003-2010 PEAK System-Technik GmbH 6 * Copyright (C) 2011-2012 Stephane Grosjean <s.grosjean@peak-system.com> 7 * 8 * Many thanks to Klaus Hitschler <klaus.hitschler@gmx.de> 9 * 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License as published 12 * by the Free Software Foundation; version 2 of the License. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 */ 19 #include <linux/netdevice.h> 20 #include <linux/usb.h> 21 #include <linux/module.h> 22 23 #include <linux/can.h> 24 #include <linux/can/dev.h> 25 #include <linux/can/error.h> 26 27 #include "pcan_usb_core.h" 28 29 MODULE_SUPPORTED_DEVICE("PEAK-System PCAN-USB adapter"); 30 31 /* PCAN-USB Endpoints */ 32 #define PCAN_USB_EP_CMDOUT 1 33 #define PCAN_USB_EP_CMDIN (PCAN_USB_EP_CMDOUT | USB_DIR_IN) 34 #define PCAN_USB_EP_MSGOUT 2 35 #define PCAN_USB_EP_MSGIN (PCAN_USB_EP_MSGOUT | USB_DIR_IN) 36 37 /* PCAN-USB command struct */ 38 #define PCAN_USB_CMD_FUNC 0 39 #define PCAN_USB_CMD_NUM 1 40 #define PCAN_USB_CMD_ARGS 2 41 #define PCAN_USB_CMD_ARGS_LEN 14 42 #define PCAN_USB_CMD_LEN (PCAN_USB_CMD_ARGS + \ 43 PCAN_USB_CMD_ARGS_LEN) 44 45 /* PCAN-USB command timeout (ms.) */ 46 #define PCAN_USB_COMMAND_TIMEOUT 1000 47 48 /* PCAN-USB startup timeout (ms.) */ 49 #define PCAN_USB_STARTUP_TIMEOUT 10 50 51 /* PCAN-USB rx/tx buffers size */ 52 #define PCAN_USB_RX_BUFFER_SIZE 64 53 #define PCAN_USB_TX_BUFFER_SIZE 64 54 55 #define PCAN_USB_MSG_HEADER_LEN 2 56 57 /* PCAN-USB adapter internal clock (MHz) */ 58 #define PCAN_USB_CRYSTAL_HZ 16000000 59 60 /* PCAN-USB USB message record status/len field */ 61 #define PCAN_USB_STATUSLEN_TIMESTAMP (1 << 7) 62 #define PCAN_USB_STATUSLEN_INTERNAL (1 << 6) 63 #define PCAN_USB_STATUSLEN_EXT_ID (1 << 5) 64 #define PCAN_USB_STATUSLEN_RTR (1 << 4) 65 #define PCAN_USB_STATUSLEN_DLC (0xf) 66 67 /* PCAN-USB error flags */ 68 #define PCAN_USB_ERROR_TXFULL 0x01 69 #define PCAN_USB_ERROR_RXQOVR 0x02 70 #define PCAN_USB_ERROR_BUS_LIGHT 0x04 71 #define PCAN_USB_ERROR_BUS_HEAVY 0x08 72 #define PCAN_USB_ERROR_BUS_OFF 0x10 73 #define PCAN_USB_ERROR_RXQEMPTY 0x20 74 #define PCAN_USB_ERROR_QOVR 0x40 75 #define PCAN_USB_ERROR_TXQFULL 0x80 76 77 /* SJA1000 modes */ 78 #define SJA1000_MODE_NORMAL 0x00 79 #define SJA1000_MODE_INIT 0x01 80 81 /* 82 * tick duration = 42.666 us => 83 * (tick_number * 44739243) >> 20 ~ (tick_number * 42666) / 1000 84 * accuracy = 10^-7 85 */ 86 #define PCAN_USB_TS_DIV_SHIFTER 20 87 #define PCAN_USB_TS_US_PER_TICK 44739243 88 89 /* PCAN-USB messages record types */ 90 #define PCAN_USB_REC_ERROR 1 91 #define PCAN_USB_REC_ANALOG 2 92 #define PCAN_USB_REC_BUSLOAD 3 93 #define PCAN_USB_REC_TS 4 94 #define PCAN_USB_REC_BUSEVT 5 95 96 /* private to PCAN-USB adapter */ 97 struct pcan_usb { 98 struct peak_usb_device dev; 99 struct peak_time_ref time_ref; 100 struct timer_list restart_timer; 101 }; 102 103 /* incoming message context for decoding */ 104 struct pcan_usb_msg_context { 105 u16 ts16; 106 u8 prev_ts8; 107 u8 *ptr; 108 u8 *end; 109 u8 rec_cnt; 110 u8 rec_idx; 111 u8 rec_data_idx; 112 struct net_device *netdev; 113 struct pcan_usb *pdev; 114 }; 115 116 /* 117 * send a command 118 */ 119 static int pcan_usb_send_cmd(struct peak_usb_device *dev, u8 f, u8 n, u8 *p) 120 { 121 int err; 122 int actual_length; 123 124 /* usb device unregistered? */ 125 if (!(dev->state & PCAN_USB_STATE_CONNECTED)) 126 return 0; 127 128 dev->cmd_buf[PCAN_USB_CMD_FUNC] = f; 129 dev->cmd_buf[PCAN_USB_CMD_NUM] = n; 130 131 if (p) 132 memcpy(dev->cmd_buf + PCAN_USB_CMD_ARGS, 133 p, PCAN_USB_CMD_ARGS_LEN); 134 135 err = usb_bulk_msg(dev->udev, 136 usb_sndbulkpipe(dev->udev, PCAN_USB_EP_CMDOUT), 137 dev->cmd_buf, PCAN_USB_CMD_LEN, &actual_length, 138 PCAN_USB_COMMAND_TIMEOUT); 139 if (err) 140 netdev_err(dev->netdev, 141 "sending cmd f=0x%x n=0x%x failure: %d\n", 142 f, n, err); 143 return err; 144 } 145 146 /* 147 * send a command then wait for its response 148 */ 149 static int pcan_usb_wait_rsp(struct peak_usb_device *dev, u8 f, u8 n, u8 *p) 150 { 151 int err; 152 int actual_length; 153 154 /* usb device unregistered? */ 155 if (!(dev->state & PCAN_USB_STATE_CONNECTED)) 156 return 0; 157 158 /* first, send command */ 159 err = pcan_usb_send_cmd(dev, f, n, NULL); 160 if (err) 161 return err; 162 163 err = usb_bulk_msg(dev->udev, 164 usb_rcvbulkpipe(dev->udev, PCAN_USB_EP_CMDIN), 165 dev->cmd_buf, PCAN_USB_CMD_LEN, &actual_length, 166 PCAN_USB_COMMAND_TIMEOUT); 167 if (err) 168 netdev_err(dev->netdev, 169 "waiting rsp f=0x%x n=0x%x failure: %d\n", f, n, err); 170 else if (p) 171 memcpy(p, dev->cmd_buf + PCAN_USB_CMD_ARGS, 172 PCAN_USB_CMD_ARGS_LEN); 173 174 return err; 175 } 176 177 static int pcan_usb_set_sja1000(struct peak_usb_device *dev, u8 mode) 178 { 179 u8 args[PCAN_USB_CMD_ARGS_LEN] = { 180 [1] = mode, 181 }; 182 183 return pcan_usb_send_cmd(dev, 9, 2, args); 184 } 185 186 static int pcan_usb_set_bus(struct peak_usb_device *dev, u8 onoff) 187 { 188 u8 args[PCAN_USB_CMD_ARGS_LEN] = { 189 [0] = !!onoff, 190 }; 191 192 return pcan_usb_send_cmd(dev, 3, 2, args); 193 } 194 195 static int pcan_usb_set_silent(struct peak_usb_device *dev, u8 onoff) 196 { 197 u8 args[PCAN_USB_CMD_ARGS_LEN] = { 198 [0] = !!onoff, 199 }; 200 201 return pcan_usb_send_cmd(dev, 3, 3, args); 202 } 203 204 static int pcan_usb_set_ext_vcc(struct peak_usb_device *dev, u8 onoff) 205 { 206 u8 args[PCAN_USB_CMD_ARGS_LEN] = { 207 [0] = !!onoff, 208 }; 209 210 return pcan_usb_send_cmd(dev, 10, 2, args); 211 } 212 213 /* 214 * set bittiming value to can 215 */ 216 static int pcan_usb_set_bittiming(struct peak_usb_device *dev, 217 struct can_bittiming *bt) 218 { 219 u8 args[PCAN_USB_CMD_ARGS_LEN]; 220 u8 btr0, btr1; 221 222 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); 223 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | 224 (((bt->phase_seg2 - 1) & 0x7) << 4); 225 if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 226 btr1 |= 0x80; 227 228 netdev_info(dev->netdev, "setting BTR0=0x%02x BTR1=0x%02x\n", 229 btr0, btr1); 230 231 args[0] = btr1; 232 args[1] = btr0; 233 234 return pcan_usb_send_cmd(dev, 1, 2, args); 235 } 236 237 /* 238 * init/reset can 239 */ 240 static int pcan_usb_write_mode(struct peak_usb_device *dev, u8 onoff) 241 { 242 int err; 243 244 err = pcan_usb_set_bus(dev, onoff); 245 if (err) 246 return err; 247 248 if (!onoff) { 249 err = pcan_usb_set_sja1000(dev, SJA1000_MODE_INIT); 250 } else { 251 /* the PCAN-USB needs time to init */ 252 set_current_state(TASK_INTERRUPTIBLE); 253 schedule_timeout(msecs_to_jiffies(PCAN_USB_STARTUP_TIMEOUT)); 254 } 255 256 return err; 257 } 258 259 /* 260 * handle end of waiting for the device to reset 261 */ 262 static void pcan_usb_restart(struct timer_list *t) 263 { 264 struct pcan_usb *pdev = from_timer(pdev, t, restart_timer); 265 struct peak_usb_device *dev = &pdev->dev; 266 267 /* notify candev and netdev */ 268 peak_usb_restart_complete(dev); 269 } 270 271 /* 272 * handle the submission of the restart urb 273 */ 274 static void pcan_usb_restart_pending(struct urb *urb) 275 { 276 struct pcan_usb *pdev = urb->context; 277 278 /* the PCAN-USB needs time to restart */ 279 mod_timer(&pdev->restart_timer, 280 jiffies + msecs_to_jiffies(PCAN_USB_STARTUP_TIMEOUT)); 281 282 /* can delete usb resources */ 283 peak_usb_async_complete(urb); 284 } 285 286 /* 287 * handle asynchronous restart 288 */ 289 static int pcan_usb_restart_async(struct peak_usb_device *dev, struct urb *urb, 290 u8 *buf) 291 { 292 struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev); 293 294 if (timer_pending(&pdev->restart_timer)) 295 return -EBUSY; 296 297 /* set bus on */ 298 buf[PCAN_USB_CMD_FUNC] = 3; 299 buf[PCAN_USB_CMD_NUM] = 2; 300 buf[PCAN_USB_CMD_ARGS] = 1; 301 302 usb_fill_bulk_urb(urb, dev->udev, 303 usb_sndbulkpipe(dev->udev, PCAN_USB_EP_CMDOUT), 304 buf, PCAN_USB_CMD_LEN, 305 pcan_usb_restart_pending, pdev); 306 307 return usb_submit_urb(urb, GFP_ATOMIC); 308 } 309 310 /* 311 * read serial number from device 312 */ 313 static int pcan_usb_get_serial(struct peak_usb_device *dev, u32 *serial_number) 314 { 315 u8 args[PCAN_USB_CMD_ARGS_LEN]; 316 int err; 317 318 err = pcan_usb_wait_rsp(dev, 6, 1, args); 319 if (err) { 320 netdev_err(dev->netdev, "getting serial failure: %d\n", err); 321 } else if (serial_number) { 322 __le32 tmp32; 323 324 memcpy(&tmp32, args, 4); 325 *serial_number = le32_to_cpu(tmp32); 326 } 327 328 return err; 329 } 330 331 /* 332 * read device id from device 333 */ 334 static int pcan_usb_get_device_id(struct peak_usb_device *dev, u32 *device_id) 335 { 336 u8 args[PCAN_USB_CMD_ARGS_LEN]; 337 int err; 338 339 err = pcan_usb_wait_rsp(dev, 4, 1, args); 340 if (err) 341 netdev_err(dev->netdev, "getting device id failure: %d\n", err); 342 else if (device_id) 343 *device_id = args[0]; 344 345 return err; 346 } 347 348 /* 349 * update current time ref with received timestamp 350 */ 351 static int pcan_usb_update_ts(struct pcan_usb_msg_context *mc) 352 { 353 __le16 tmp16; 354 355 if ((mc->ptr+2) > mc->end) 356 return -EINVAL; 357 358 memcpy(&tmp16, mc->ptr, 2); 359 360 mc->ts16 = le16_to_cpu(tmp16); 361 362 if (mc->rec_idx > 0) 363 peak_usb_update_ts_now(&mc->pdev->time_ref, mc->ts16); 364 else 365 peak_usb_set_ts_now(&mc->pdev->time_ref, mc->ts16); 366 367 return 0; 368 } 369 370 /* 371 * decode received timestamp 372 */ 373 static int pcan_usb_decode_ts(struct pcan_usb_msg_context *mc, u8 first_packet) 374 { 375 /* only 1st packet supplies a word timestamp */ 376 if (first_packet) { 377 __le16 tmp16; 378 379 if ((mc->ptr + 2) > mc->end) 380 return -EINVAL; 381 382 memcpy(&tmp16, mc->ptr, 2); 383 mc->ptr += 2; 384 385 mc->ts16 = le16_to_cpu(tmp16); 386 mc->prev_ts8 = mc->ts16 & 0x00ff; 387 } else { 388 u8 ts8; 389 390 if ((mc->ptr + 1) > mc->end) 391 return -EINVAL; 392 393 ts8 = *mc->ptr++; 394 395 if (ts8 < mc->prev_ts8) 396 mc->ts16 += 0x100; 397 398 mc->ts16 &= 0xff00; 399 mc->ts16 |= ts8; 400 mc->prev_ts8 = ts8; 401 } 402 403 return 0; 404 } 405 406 static int pcan_usb_decode_error(struct pcan_usb_msg_context *mc, u8 n, 407 u8 status_len) 408 { 409 struct sk_buff *skb; 410 struct can_frame *cf; 411 enum can_state new_state; 412 413 /* ignore this error until 1st ts received */ 414 if (n == PCAN_USB_ERROR_QOVR) 415 if (!mc->pdev->time_ref.tick_count) 416 return 0; 417 418 new_state = mc->pdev->dev.can.state; 419 420 switch (mc->pdev->dev.can.state) { 421 case CAN_STATE_ERROR_ACTIVE: 422 if (n & PCAN_USB_ERROR_BUS_LIGHT) { 423 new_state = CAN_STATE_ERROR_WARNING; 424 break; 425 } 426 427 case CAN_STATE_ERROR_WARNING: 428 if (n & PCAN_USB_ERROR_BUS_HEAVY) { 429 new_state = CAN_STATE_ERROR_PASSIVE; 430 break; 431 } 432 if (n & PCAN_USB_ERROR_BUS_OFF) { 433 new_state = CAN_STATE_BUS_OFF; 434 break; 435 } 436 if (n & (PCAN_USB_ERROR_RXQOVR | PCAN_USB_ERROR_QOVR)) { 437 /* 438 * trick to bypass next comparison and process other 439 * errors 440 */ 441 new_state = CAN_STATE_MAX; 442 break; 443 } 444 if ((n & PCAN_USB_ERROR_BUS_LIGHT) == 0) { 445 /* no error (back to active state) */ 446 mc->pdev->dev.can.state = CAN_STATE_ERROR_ACTIVE; 447 return 0; 448 } 449 break; 450 451 case CAN_STATE_ERROR_PASSIVE: 452 if (n & PCAN_USB_ERROR_BUS_OFF) { 453 new_state = CAN_STATE_BUS_OFF; 454 break; 455 } 456 if (n & PCAN_USB_ERROR_BUS_LIGHT) { 457 new_state = CAN_STATE_ERROR_WARNING; 458 break; 459 } 460 if (n & (PCAN_USB_ERROR_RXQOVR | PCAN_USB_ERROR_QOVR)) { 461 /* 462 * trick to bypass next comparison and process other 463 * errors 464 */ 465 new_state = CAN_STATE_MAX; 466 break; 467 } 468 469 if ((n & PCAN_USB_ERROR_BUS_HEAVY) == 0) { 470 /* no error (back to active state) */ 471 mc->pdev->dev.can.state = CAN_STATE_ERROR_ACTIVE; 472 return 0; 473 } 474 break; 475 476 default: 477 /* do nothing waiting for restart */ 478 return 0; 479 } 480 481 /* donot post any error if current state didn't change */ 482 if (mc->pdev->dev.can.state == new_state) 483 return 0; 484 485 /* allocate an skb to store the error frame */ 486 skb = alloc_can_err_skb(mc->netdev, &cf); 487 if (!skb) 488 return -ENOMEM; 489 490 switch (new_state) { 491 case CAN_STATE_BUS_OFF: 492 cf->can_id |= CAN_ERR_BUSOFF; 493 mc->pdev->dev.can.can_stats.bus_off++; 494 can_bus_off(mc->netdev); 495 break; 496 497 case CAN_STATE_ERROR_PASSIVE: 498 cf->can_id |= CAN_ERR_CRTL; 499 cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE | 500 CAN_ERR_CRTL_RX_PASSIVE; 501 mc->pdev->dev.can.can_stats.error_passive++; 502 break; 503 504 case CAN_STATE_ERROR_WARNING: 505 cf->can_id |= CAN_ERR_CRTL; 506 cf->data[1] |= CAN_ERR_CRTL_TX_WARNING | 507 CAN_ERR_CRTL_RX_WARNING; 508 mc->pdev->dev.can.can_stats.error_warning++; 509 break; 510 511 default: 512 /* CAN_STATE_MAX (trick to handle other errors) */ 513 cf->can_id |= CAN_ERR_CRTL; 514 cf->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW; 515 mc->netdev->stats.rx_over_errors++; 516 mc->netdev->stats.rx_errors++; 517 518 new_state = mc->pdev->dev.can.state; 519 break; 520 } 521 522 mc->pdev->dev.can.state = new_state; 523 524 if (status_len & PCAN_USB_STATUSLEN_TIMESTAMP) { 525 struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb); 526 527 peak_usb_get_ts_time(&mc->pdev->time_ref, mc->ts16, 528 &hwts->hwtstamp); 529 } 530 531 mc->netdev->stats.rx_packets++; 532 mc->netdev->stats.rx_bytes += cf->can_dlc; 533 netif_rx(skb); 534 535 return 0; 536 } 537 538 /* 539 * decode non-data usb message 540 */ 541 static int pcan_usb_decode_status(struct pcan_usb_msg_context *mc, 542 u8 status_len) 543 { 544 u8 rec_len = status_len & PCAN_USB_STATUSLEN_DLC; 545 u8 f, n; 546 int err; 547 548 /* check whether function and number can be read */ 549 if ((mc->ptr + 2) > mc->end) 550 return -EINVAL; 551 552 f = mc->ptr[PCAN_USB_CMD_FUNC]; 553 n = mc->ptr[PCAN_USB_CMD_NUM]; 554 mc->ptr += PCAN_USB_CMD_ARGS; 555 556 if (status_len & PCAN_USB_STATUSLEN_TIMESTAMP) { 557 int err = pcan_usb_decode_ts(mc, !mc->rec_idx); 558 559 if (err) 560 return err; 561 } 562 563 switch (f) { 564 case PCAN_USB_REC_ERROR: 565 err = pcan_usb_decode_error(mc, n, status_len); 566 if (err) 567 return err; 568 break; 569 570 case PCAN_USB_REC_ANALOG: 571 /* analog values (ignored) */ 572 rec_len = 2; 573 break; 574 575 case PCAN_USB_REC_BUSLOAD: 576 /* bus load (ignored) */ 577 rec_len = 1; 578 break; 579 580 case PCAN_USB_REC_TS: 581 /* only timestamp */ 582 if (pcan_usb_update_ts(mc)) 583 return -EINVAL; 584 break; 585 586 case PCAN_USB_REC_BUSEVT: 587 /* error frame/bus event */ 588 if (n & PCAN_USB_ERROR_TXQFULL) 589 netdev_dbg(mc->netdev, "device Tx queue full)\n"); 590 break; 591 default: 592 netdev_err(mc->netdev, "unexpected function %u\n", f); 593 break; 594 } 595 596 if ((mc->ptr + rec_len) > mc->end) 597 return -EINVAL; 598 599 mc->ptr += rec_len; 600 601 return 0; 602 } 603 604 /* 605 * decode data usb message 606 */ 607 static int pcan_usb_decode_data(struct pcan_usb_msg_context *mc, u8 status_len) 608 { 609 u8 rec_len = status_len & PCAN_USB_STATUSLEN_DLC; 610 struct sk_buff *skb; 611 struct can_frame *cf; 612 struct skb_shared_hwtstamps *hwts; 613 614 skb = alloc_can_skb(mc->netdev, &cf); 615 if (!skb) 616 return -ENOMEM; 617 618 if (status_len & PCAN_USB_STATUSLEN_EXT_ID) { 619 __le32 tmp32; 620 621 if ((mc->ptr + 4) > mc->end) 622 goto decode_failed; 623 624 memcpy(&tmp32, mc->ptr, 4); 625 mc->ptr += 4; 626 627 cf->can_id = (le32_to_cpu(tmp32) >> 3) | CAN_EFF_FLAG; 628 } else { 629 __le16 tmp16; 630 631 if ((mc->ptr + 2) > mc->end) 632 goto decode_failed; 633 634 memcpy(&tmp16, mc->ptr, 2); 635 mc->ptr += 2; 636 637 cf->can_id = le16_to_cpu(tmp16) >> 5; 638 } 639 640 cf->can_dlc = get_can_dlc(rec_len); 641 642 /* first data packet timestamp is a word */ 643 if (pcan_usb_decode_ts(mc, !mc->rec_data_idx)) 644 goto decode_failed; 645 646 /* read data */ 647 memset(cf->data, 0x0, sizeof(cf->data)); 648 if (status_len & PCAN_USB_STATUSLEN_RTR) { 649 cf->can_id |= CAN_RTR_FLAG; 650 } else { 651 if ((mc->ptr + rec_len) > mc->end) 652 goto decode_failed; 653 654 memcpy(cf->data, mc->ptr, cf->can_dlc); 655 mc->ptr += rec_len; 656 } 657 658 /* convert timestamp into kernel time */ 659 hwts = skb_hwtstamps(skb); 660 peak_usb_get_ts_time(&mc->pdev->time_ref, mc->ts16, &hwts->hwtstamp); 661 662 /* update statistics */ 663 mc->netdev->stats.rx_packets++; 664 mc->netdev->stats.rx_bytes += cf->can_dlc; 665 /* push the skb */ 666 netif_rx(skb); 667 668 return 0; 669 670 decode_failed: 671 dev_kfree_skb(skb); 672 return -EINVAL; 673 } 674 675 /* 676 * process incoming message 677 */ 678 static int pcan_usb_decode_msg(struct peak_usb_device *dev, u8 *ibuf, u32 lbuf) 679 { 680 struct pcan_usb_msg_context mc = { 681 .rec_cnt = ibuf[1], 682 .ptr = ibuf + PCAN_USB_MSG_HEADER_LEN, 683 .end = ibuf + lbuf, 684 .netdev = dev->netdev, 685 .pdev = container_of(dev, struct pcan_usb, dev), 686 }; 687 int err; 688 689 for (err = 0; mc.rec_idx < mc.rec_cnt && !err; mc.rec_idx++) { 690 u8 sl = *mc.ptr++; 691 692 /* handle status and error frames here */ 693 if (sl & PCAN_USB_STATUSLEN_INTERNAL) { 694 err = pcan_usb_decode_status(&mc, sl); 695 /* handle normal can frames here */ 696 } else { 697 err = pcan_usb_decode_data(&mc, sl); 698 mc.rec_data_idx++; 699 } 700 } 701 702 return err; 703 } 704 705 /* 706 * process any incoming buffer 707 */ 708 static int pcan_usb_decode_buf(struct peak_usb_device *dev, struct urb *urb) 709 { 710 int err = 0; 711 712 if (urb->actual_length > PCAN_USB_MSG_HEADER_LEN) { 713 err = pcan_usb_decode_msg(dev, urb->transfer_buffer, 714 urb->actual_length); 715 716 } else if (urb->actual_length > 0) { 717 netdev_err(dev->netdev, "usb message length error (%u)\n", 718 urb->actual_length); 719 err = -EINVAL; 720 } 721 722 return err; 723 } 724 725 /* 726 * process outgoing packet 727 */ 728 static int pcan_usb_encode_msg(struct peak_usb_device *dev, struct sk_buff *skb, 729 u8 *obuf, size_t *size) 730 { 731 struct net_device *netdev = dev->netdev; 732 struct net_device_stats *stats = &netdev->stats; 733 struct can_frame *cf = (struct can_frame *)skb->data; 734 u8 *pc; 735 736 obuf[0] = 2; 737 obuf[1] = 1; 738 739 pc = obuf + PCAN_USB_MSG_HEADER_LEN; 740 741 /* status/len byte */ 742 *pc = cf->can_dlc; 743 if (cf->can_id & CAN_RTR_FLAG) 744 *pc |= PCAN_USB_STATUSLEN_RTR; 745 746 /* can id */ 747 if (cf->can_id & CAN_EFF_FLAG) { 748 __le32 tmp32 = cpu_to_le32((cf->can_id & CAN_ERR_MASK) << 3); 749 750 *pc |= PCAN_USB_STATUSLEN_EXT_ID; 751 memcpy(++pc, &tmp32, 4); 752 pc += 4; 753 } else { 754 __le16 tmp16 = cpu_to_le16((cf->can_id & CAN_ERR_MASK) << 5); 755 756 memcpy(++pc, &tmp16, 2); 757 pc += 2; 758 } 759 760 /* can data */ 761 if (!(cf->can_id & CAN_RTR_FLAG)) { 762 memcpy(pc, cf->data, cf->can_dlc); 763 pc += cf->can_dlc; 764 } 765 766 obuf[(*size)-1] = (u8)(stats->tx_packets & 0xff); 767 768 return 0; 769 } 770 771 /* 772 * start interface 773 */ 774 static int pcan_usb_start(struct peak_usb_device *dev) 775 { 776 struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev); 777 778 /* number of bits used in timestamps read from adapter struct */ 779 peak_usb_init_time_ref(&pdev->time_ref, &pcan_usb); 780 781 /* if revision greater than 3, can put silent mode on/off */ 782 if (dev->device_rev > 3) { 783 int err; 784 785 err = pcan_usb_set_silent(dev, 786 dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY); 787 if (err) 788 return err; 789 } 790 791 return pcan_usb_set_ext_vcc(dev, 0); 792 } 793 794 static int pcan_usb_init(struct peak_usb_device *dev) 795 { 796 struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev); 797 u32 serial_number; 798 int err; 799 800 /* initialize a timer needed to wait for hardware restart */ 801 timer_setup(&pdev->restart_timer, pcan_usb_restart, 0); 802 803 /* 804 * explicit use of dev_xxx() instead of netdev_xxx() here: 805 * information displayed are related to the device itself, not 806 * to the canx netdevice. 807 */ 808 err = pcan_usb_get_serial(dev, &serial_number); 809 if (err) { 810 dev_err(dev->netdev->dev.parent, 811 "unable to read %s serial number (err %d)\n", 812 pcan_usb.name, err); 813 return err; 814 } 815 816 dev_info(dev->netdev->dev.parent, 817 "PEAK-System %s adapter hwrev %u serial %08X (%u channel)\n", 818 pcan_usb.name, dev->device_rev, serial_number, 819 pcan_usb.ctrl_count); 820 821 return 0; 822 } 823 824 /* 825 * probe function for new PCAN-USB usb interface 826 */ 827 static int pcan_usb_probe(struct usb_interface *intf) 828 { 829 struct usb_host_interface *if_desc; 830 int i; 831 832 if_desc = intf->altsetting; 833 834 /* check interface endpoint addresses */ 835 for (i = 0; i < if_desc->desc.bNumEndpoints; i++) { 836 struct usb_endpoint_descriptor *ep = &if_desc->endpoint[i].desc; 837 838 switch (ep->bEndpointAddress) { 839 case PCAN_USB_EP_CMDOUT: 840 case PCAN_USB_EP_CMDIN: 841 case PCAN_USB_EP_MSGOUT: 842 case PCAN_USB_EP_MSGIN: 843 break; 844 default: 845 return -ENODEV; 846 } 847 } 848 849 return 0; 850 } 851 852 /* 853 * describe the PCAN-USB adapter 854 */ 855 static const struct can_bittiming_const pcan_usb_const = { 856 .name = "pcan_usb", 857 .tseg1_min = 1, 858 .tseg1_max = 16, 859 .tseg2_min = 1, 860 .tseg2_max = 8, 861 .sjw_max = 4, 862 .brp_min = 1, 863 .brp_max = 64, 864 .brp_inc = 1, 865 }; 866 867 const struct peak_usb_adapter pcan_usb = { 868 .name = "PCAN-USB", 869 .device_id = PCAN_USB_PRODUCT_ID, 870 .ctrl_count = 1, 871 .ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY, 872 .clock = { 873 .freq = PCAN_USB_CRYSTAL_HZ / 2 , 874 }, 875 .bittiming_const = &pcan_usb_const, 876 877 /* size of device private data */ 878 .sizeof_dev_private = sizeof(struct pcan_usb), 879 880 /* timestamps usage */ 881 .ts_used_bits = 16, 882 .ts_period = 24575, /* calibration period in ts. */ 883 .us_per_ts_scale = PCAN_USB_TS_US_PER_TICK, /* us=(ts*scale) */ 884 .us_per_ts_shift = PCAN_USB_TS_DIV_SHIFTER, /* >> shift */ 885 886 /* give here messages in/out endpoints */ 887 .ep_msg_in = PCAN_USB_EP_MSGIN, 888 .ep_msg_out = {PCAN_USB_EP_MSGOUT}, 889 890 /* size of rx/tx usb buffers */ 891 .rx_buffer_size = PCAN_USB_RX_BUFFER_SIZE, 892 .tx_buffer_size = PCAN_USB_TX_BUFFER_SIZE, 893 894 /* device callbacks */ 895 .intf_probe = pcan_usb_probe, 896 .dev_init = pcan_usb_init, 897 .dev_set_bus = pcan_usb_write_mode, 898 .dev_set_bittiming = pcan_usb_set_bittiming, 899 .dev_get_device_id = pcan_usb_get_device_id, 900 .dev_decode_buf = pcan_usb_decode_buf, 901 .dev_encode_msg = pcan_usb_encode_msg, 902 .dev_start = pcan_usb_start, 903 .dev_restart_async = pcan_usb_restart_async, 904 }; 905