1 /* 2 * CAN driver for PEAK System PCAN-USB Pro adapter 3 * Derived from the PCAN project file driver/src/pcan_usbpro.c 4 * 5 * Copyright (C) 2003-2011 PEAK System-Technik GmbH 6 * Copyright (C) 2011-2012 Stephane Grosjean <s.grosjean@peak-system.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published 10 * by the Free Software Foundation; version 2 of the License. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 */ 17 #include <linux/netdevice.h> 18 #include <linux/usb.h> 19 #include <linux/module.h> 20 21 #include <linux/can.h> 22 #include <linux/can/dev.h> 23 #include <linux/can/error.h> 24 25 #include "pcan_usb_core.h" 26 #include "pcan_usb_pro.h" 27 28 MODULE_SUPPORTED_DEVICE("PEAK-System PCAN-USB Pro adapter"); 29 30 #define PCAN_USBPRO_CHANNEL_COUNT 2 31 32 /* PCAN-USB Pro adapter internal clock (MHz) */ 33 #define PCAN_USBPRO_CRYSTAL_HZ 56000000 34 35 /* PCAN-USB Pro command timeout (ms.) */ 36 #define PCAN_USBPRO_COMMAND_TIMEOUT 1000 37 38 /* PCAN-USB Pro rx/tx buffers size */ 39 #define PCAN_USBPRO_RX_BUFFER_SIZE 1024 40 #define PCAN_USBPRO_TX_BUFFER_SIZE 64 41 42 #define PCAN_USBPRO_MSG_HEADER_LEN 4 43 44 /* some commands responses need to be re-submitted */ 45 #define PCAN_USBPRO_RSP_SUBMIT_MAX 2 46 47 #define PCAN_USBPRO_RTR 0x01 48 #define PCAN_USBPRO_EXT 0x02 49 50 #define PCAN_USBPRO_CMD_BUFFER_SIZE 512 51 52 /* handle device specific info used by the netdevices */ 53 struct pcan_usb_pro_interface { 54 struct peak_usb_device *dev[PCAN_USBPRO_CHANNEL_COUNT]; 55 struct peak_time_ref time_ref; 56 int cm_ignore_count; 57 int dev_opened_count; 58 }; 59 60 /* device information */ 61 struct pcan_usb_pro_device { 62 struct peak_usb_device dev; 63 struct pcan_usb_pro_interface *usb_if; 64 u32 cached_ccbt; 65 }; 66 67 /* internal structure used to handle messages sent to bulk urb */ 68 struct pcan_usb_pro_msg { 69 u8 *rec_ptr; 70 int rec_buffer_size; 71 int rec_buffer_len; 72 union { 73 __le16 *rec_cnt_rd; 74 __le32 *rec_cnt; 75 u8 *rec_buffer; 76 } u; 77 }; 78 79 /* records sizes table indexed on message id. (8-bits value) */ 80 static u16 pcan_usb_pro_sizeof_rec[256] = { 81 [PCAN_USBPRO_SETBTR] = sizeof(struct pcan_usb_pro_btr), 82 [PCAN_USBPRO_SETBUSACT] = sizeof(struct pcan_usb_pro_busact), 83 [PCAN_USBPRO_SETSILENT] = sizeof(struct pcan_usb_pro_silent), 84 [PCAN_USBPRO_SETFILTR] = sizeof(struct pcan_usb_pro_filter), 85 [PCAN_USBPRO_SETTS] = sizeof(struct pcan_usb_pro_setts), 86 [PCAN_USBPRO_GETDEVID] = sizeof(struct pcan_usb_pro_devid), 87 [PCAN_USBPRO_SETLED] = sizeof(struct pcan_usb_pro_setled), 88 [PCAN_USBPRO_RXMSG8] = sizeof(struct pcan_usb_pro_rxmsg), 89 [PCAN_USBPRO_RXMSG4] = sizeof(struct pcan_usb_pro_rxmsg) - 4, 90 [PCAN_USBPRO_RXMSG0] = sizeof(struct pcan_usb_pro_rxmsg) - 8, 91 [PCAN_USBPRO_RXRTR] = sizeof(struct pcan_usb_pro_rxmsg) - 8, 92 [PCAN_USBPRO_RXSTATUS] = sizeof(struct pcan_usb_pro_rxstatus), 93 [PCAN_USBPRO_RXTS] = sizeof(struct pcan_usb_pro_rxts), 94 [PCAN_USBPRO_TXMSG8] = sizeof(struct pcan_usb_pro_txmsg), 95 [PCAN_USBPRO_TXMSG4] = sizeof(struct pcan_usb_pro_txmsg) - 4, 96 [PCAN_USBPRO_TXMSG0] = sizeof(struct pcan_usb_pro_txmsg) - 8, 97 }; 98 99 /* 100 * initialize PCAN-USB Pro message data structure 101 */ 102 static u8 *pcan_msg_init(struct pcan_usb_pro_msg *pm, void *buffer_addr, 103 int buffer_size) 104 { 105 if (buffer_size < PCAN_USBPRO_MSG_HEADER_LEN) 106 return NULL; 107 108 pm->u.rec_buffer = (u8 *)buffer_addr; 109 pm->rec_buffer_size = pm->rec_buffer_len = buffer_size; 110 pm->rec_ptr = pm->u.rec_buffer + PCAN_USBPRO_MSG_HEADER_LEN; 111 112 return pm->rec_ptr; 113 } 114 115 static u8 *pcan_msg_init_empty(struct pcan_usb_pro_msg *pm, 116 void *buffer_addr, int buffer_size) 117 { 118 u8 *pr = pcan_msg_init(pm, buffer_addr, buffer_size); 119 120 if (pr) { 121 pm->rec_buffer_len = PCAN_USBPRO_MSG_HEADER_LEN; 122 *pm->u.rec_cnt = 0; 123 } 124 return pr; 125 } 126 127 /* 128 * add one record to a message being built 129 */ 130 static int pcan_msg_add_rec(struct pcan_usb_pro_msg *pm, u8 id, ...) 131 { 132 int len, i; 133 u8 *pc; 134 va_list ap; 135 136 va_start(ap, id); 137 138 pc = pm->rec_ptr + 1; 139 140 i = 0; 141 switch (id) { 142 case PCAN_USBPRO_TXMSG8: 143 i += 4; 144 case PCAN_USBPRO_TXMSG4: 145 i += 4; 146 case PCAN_USBPRO_TXMSG0: 147 *pc++ = va_arg(ap, int); 148 *pc++ = va_arg(ap, int); 149 *pc++ = va_arg(ap, int); 150 *(__le32 *)pc = cpu_to_le32(va_arg(ap, u32)); 151 pc += 4; 152 memcpy(pc, va_arg(ap, int *), i); 153 pc += i; 154 break; 155 156 case PCAN_USBPRO_SETBTR: 157 case PCAN_USBPRO_GETDEVID: 158 *pc++ = va_arg(ap, int); 159 pc += 2; 160 *(__le32 *)pc = cpu_to_le32(va_arg(ap, u32)); 161 pc += 4; 162 break; 163 164 case PCAN_USBPRO_SETFILTR: 165 case PCAN_USBPRO_SETBUSACT: 166 case PCAN_USBPRO_SETSILENT: 167 *pc++ = va_arg(ap, int); 168 *(__le16 *)pc = cpu_to_le16(va_arg(ap, int)); 169 pc += 2; 170 break; 171 172 case PCAN_USBPRO_SETLED: 173 *pc++ = va_arg(ap, int); 174 *(__le16 *)pc = cpu_to_le16(va_arg(ap, int)); 175 pc += 2; 176 *(__le32 *)pc = cpu_to_le32(va_arg(ap, u32)); 177 pc += 4; 178 break; 179 180 case PCAN_USBPRO_SETTS: 181 pc++; 182 *(__le16 *)pc = cpu_to_le16(va_arg(ap, int)); 183 pc += 2; 184 break; 185 186 default: 187 pr_err("%s: %s(): unknown data type %02Xh (%d)\n", 188 PCAN_USB_DRIVER_NAME, __func__, id, id); 189 pc--; 190 break; 191 } 192 193 len = pc - pm->rec_ptr; 194 if (len > 0) { 195 *pm->u.rec_cnt = cpu_to_le32(le32_to_cpu(*pm->u.rec_cnt) + 1); 196 *pm->rec_ptr = id; 197 198 pm->rec_ptr = pc; 199 pm->rec_buffer_len += len; 200 } 201 202 va_end(ap); 203 204 return len; 205 } 206 207 /* 208 * send PCAN-USB Pro command synchronously 209 */ 210 static int pcan_usb_pro_send_cmd(struct peak_usb_device *dev, 211 struct pcan_usb_pro_msg *pum) 212 { 213 int actual_length; 214 int err; 215 216 /* usb device unregistered? */ 217 if (!(dev->state & PCAN_USB_STATE_CONNECTED)) 218 return 0; 219 220 err = usb_bulk_msg(dev->udev, 221 usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT), 222 pum->u.rec_buffer, pum->rec_buffer_len, 223 &actual_length, PCAN_USBPRO_COMMAND_TIMEOUT); 224 if (err) 225 netdev_err(dev->netdev, "sending command failure: %d\n", err); 226 227 return err; 228 } 229 230 /* 231 * wait for PCAN-USB Pro command response 232 */ 233 static int pcan_usb_pro_wait_rsp(struct peak_usb_device *dev, 234 struct pcan_usb_pro_msg *pum) 235 { 236 u8 req_data_type, req_channel; 237 int actual_length; 238 int i, err = 0; 239 240 /* usb device unregistered? */ 241 if (!(dev->state & PCAN_USB_STATE_CONNECTED)) 242 return 0; 243 244 req_data_type = pum->u.rec_buffer[4]; 245 req_channel = pum->u.rec_buffer[5]; 246 247 *pum->u.rec_cnt = 0; 248 for (i = 0; !err && i < PCAN_USBPRO_RSP_SUBMIT_MAX; i++) { 249 struct pcan_usb_pro_msg rsp; 250 union pcan_usb_pro_rec *pr; 251 u32 r, rec_cnt; 252 u16 rec_len; 253 u8 *pc; 254 255 err = usb_bulk_msg(dev->udev, 256 usb_rcvbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDIN), 257 pum->u.rec_buffer, pum->rec_buffer_len, 258 &actual_length, PCAN_USBPRO_COMMAND_TIMEOUT); 259 if (err) { 260 netdev_err(dev->netdev, "waiting rsp error %d\n", err); 261 break; 262 } 263 264 if (actual_length == 0) 265 continue; 266 267 err = -EBADMSG; 268 if (actual_length < PCAN_USBPRO_MSG_HEADER_LEN) { 269 netdev_err(dev->netdev, 270 "got abnormal too small rsp (len=%d)\n", 271 actual_length); 272 break; 273 } 274 275 pc = pcan_msg_init(&rsp, pum->u.rec_buffer, 276 actual_length); 277 278 rec_cnt = le32_to_cpu(*rsp.u.rec_cnt); 279 280 /* loop on records stored into message */ 281 for (r = 0; r < rec_cnt; r++) { 282 pr = (union pcan_usb_pro_rec *)pc; 283 rec_len = pcan_usb_pro_sizeof_rec[pr->data_type]; 284 if (!rec_len) { 285 netdev_err(dev->netdev, 286 "got unprocessed record in msg\n"); 287 pcan_dump_mem("rcvd rsp msg", pum->u.rec_buffer, 288 actual_length); 289 break; 290 } 291 292 /* check if response corresponds to request */ 293 if (pr->data_type != req_data_type) 294 netdev_err(dev->netdev, 295 "got unwanted rsp %xh: ignored\n", 296 pr->data_type); 297 298 /* check if channel in response corresponds too */ 299 else if ((req_channel != 0xff) && \ 300 (pr->bus_act.channel != req_channel)) 301 netdev_err(dev->netdev, 302 "got rsp %xh but on chan%u: ignored\n", 303 req_data_type, pr->bus_act.channel); 304 305 /* got the response */ 306 else 307 return 0; 308 309 /* otherwise, go on with next record in message */ 310 pc += rec_len; 311 } 312 } 313 314 return (i >= PCAN_USBPRO_RSP_SUBMIT_MAX) ? -ERANGE : err; 315 } 316 317 int pcan_usb_pro_send_req(struct peak_usb_device *dev, int req_id, 318 int req_value, void *req_addr, int req_size) 319 { 320 int err; 321 u8 req_type; 322 unsigned int p; 323 324 /* usb device unregistered? */ 325 if (!(dev->state & PCAN_USB_STATE_CONNECTED)) 326 return 0; 327 328 req_type = USB_TYPE_VENDOR | USB_RECIP_OTHER; 329 330 switch (req_id) { 331 case PCAN_USBPRO_REQ_FCT: 332 p = usb_sndctrlpipe(dev->udev, 0); 333 break; 334 335 default: 336 p = usb_rcvctrlpipe(dev->udev, 0); 337 req_type |= USB_DIR_IN; 338 memset(req_addr, '\0', req_size); 339 break; 340 } 341 342 err = usb_control_msg(dev->udev, p, req_id, req_type, req_value, 0, 343 req_addr, req_size, 2 * USB_CTRL_GET_TIMEOUT); 344 if (err < 0) { 345 netdev_info(dev->netdev, 346 "unable to request usb[type=%d value=%d] err=%d\n", 347 req_id, req_value, err); 348 return err; 349 } 350 351 return 0; 352 } 353 354 static int pcan_usb_pro_set_ts(struct peak_usb_device *dev, u16 onoff) 355 { 356 struct pcan_usb_pro_msg um; 357 358 pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN); 359 pcan_msg_add_rec(&um, PCAN_USBPRO_SETTS, onoff); 360 361 return pcan_usb_pro_send_cmd(dev, &um); 362 } 363 364 static int pcan_usb_pro_set_bitrate(struct peak_usb_device *dev, u32 ccbt) 365 { 366 struct pcan_usb_pro_device *pdev = 367 container_of(dev, struct pcan_usb_pro_device, dev); 368 struct pcan_usb_pro_msg um; 369 370 pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN); 371 pcan_msg_add_rec(&um, PCAN_USBPRO_SETBTR, dev->ctrl_idx, ccbt); 372 373 /* cache the CCBT value to reuse it before next buson */ 374 pdev->cached_ccbt = ccbt; 375 376 return pcan_usb_pro_send_cmd(dev, &um); 377 } 378 379 static int pcan_usb_pro_set_bus(struct peak_usb_device *dev, u8 onoff) 380 { 381 struct pcan_usb_pro_msg um; 382 383 /* if bus=on, be sure the bitrate being set before! */ 384 if (onoff) { 385 struct pcan_usb_pro_device *pdev = 386 container_of(dev, struct pcan_usb_pro_device, dev); 387 388 pcan_usb_pro_set_bitrate(dev, pdev->cached_ccbt); 389 } 390 391 pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN); 392 pcan_msg_add_rec(&um, PCAN_USBPRO_SETBUSACT, dev->ctrl_idx, onoff); 393 394 return pcan_usb_pro_send_cmd(dev, &um); 395 } 396 397 static int pcan_usb_pro_set_silent(struct peak_usb_device *dev, u8 onoff) 398 { 399 struct pcan_usb_pro_msg um; 400 401 pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN); 402 pcan_msg_add_rec(&um, PCAN_USBPRO_SETSILENT, dev->ctrl_idx, onoff); 403 404 return pcan_usb_pro_send_cmd(dev, &um); 405 } 406 407 static int pcan_usb_pro_set_filter(struct peak_usb_device *dev, u16 filter_mode) 408 { 409 struct pcan_usb_pro_msg um; 410 411 pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN); 412 pcan_msg_add_rec(&um, PCAN_USBPRO_SETFILTR, dev->ctrl_idx, filter_mode); 413 414 return pcan_usb_pro_send_cmd(dev, &um); 415 } 416 417 static int pcan_usb_pro_set_led(struct peak_usb_device *dev, u8 mode, 418 u32 timeout) 419 { 420 struct pcan_usb_pro_msg um; 421 422 pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN); 423 pcan_msg_add_rec(&um, PCAN_USBPRO_SETLED, dev->ctrl_idx, mode, timeout); 424 425 return pcan_usb_pro_send_cmd(dev, &um); 426 } 427 428 static int pcan_usb_pro_get_device_id(struct peak_usb_device *dev, 429 u32 *device_id) 430 { 431 struct pcan_usb_pro_devid *pdn; 432 struct pcan_usb_pro_msg um; 433 int err; 434 u8 *pc; 435 436 pc = pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN); 437 pcan_msg_add_rec(&um, PCAN_USBPRO_GETDEVID, dev->ctrl_idx); 438 439 err = pcan_usb_pro_send_cmd(dev, &um); 440 if (err) 441 return err; 442 443 err = pcan_usb_pro_wait_rsp(dev, &um); 444 if (err) 445 return err; 446 447 pdn = (struct pcan_usb_pro_devid *)pc; 448 if (device_id) 449 *device_id = le32_to_cpu(pdn->serial_num); 450 451 return err; 452 } 453 454 static int pcan_usb_pro_set_bittiming(struct peak_usb_device *dev, 455 struct can_bittiming *bt) 456 { 457 u32 ccbt; 458 459 ccbt = (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) ? 0x00800000 : 0; 460 ccbt |= (bt->sjw - 1) << 24; 461 ccbt |= (bt->phase_seg2 - 1) << 20; 462 ccbt |= (bt->prop_seg + bt->phase_seg1 - 1) << 16; /* = tseg1 */ 463 ccbt |= bt->brp - 1; 464 465 netdev_info(dev->netdev, "setting ccbt=0x%08x\n", ccbt); 466 467 return pcan_usb_pro_set_bitrate(dev, ccbt); 468 } 469 470 void pcan_usb_pro_restart_complete(struct urb *urb) 471 { 472 /* can delete usb resources */ 473 peak_usb_async_complete(urb); 474 475 /* notify candev and netdev */ 476 peak_usb_restart_complete(urb->context); 477 } 478 479 /* 480 * handle restart but in asynchronously way 481 */ 482 static int pcan_usb_pro_restart_async(struct peak_usb_device *dev, 483 struct urb *urb, u8 *buf) 484 { 485 struct pcan_usb_pro_msg um; 486 487 pcan_msg_init_empty(&um, buf, PCAN_USB_MAX_CMD_LEN); 488 pcan_msg_add_rec(&um, PCAN_USBPRO_SETBUSACT, dev->ctrl_idx, 1); 489 490 usb_fill_bulk_urb(urb, dev->udev, 491 usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT), 492 buf, PCAN_USB_MAX_CMD_LEN, 493 pcan_usb_pro_restart_complete, dev); 494 495 return usb_submit_urb(urb, GFP_ATOMIC); 496 } 497 498 static int pcan_usb_pro_drv_loaded(struct peak_usb_device *dev, int loaded) 499 { 500 u8 *buffer; 501 int err; 502 503 buffer = kmalloc(PCAN_USBPRO_FCT_DRVLD_REQ_LEN, GFP_KERNEL); 504 if (!buffer) 505 return -ENOMEM; 506 507 buffer[0] = 0; 508 buffer[1] = !!loaded; 509 510 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_FCT, 511 PCAN_USBPRO_FCT_DRVLD, buffer, 512 PCAN_USBPRO_FCT_DRVLD_REQ_LEN); 513 kfree(buffer); 514 515 return err; 516 } 517 518 static inline 519 struct pcan_usb_pro_interface *pcan_usb_pro_dev_if(struct peak_usb_device *dev) 520 { 521 struct pcan_usb_pro_device *pdev = 522 container_of(dev, struct pcan_usb_pro_device, dev); 523 return pdev->usb_if; 524 } 525 526 static int pcan_usb_pro_handle_canmsg(struct pcan_usb_pro_interface *usb_if, 527 struct pcan_usb_pro_rxmsg *rx) 528 { 529 const unsigned int ctrl_idx = (rx->len >> 4) & 0x0f; 530 struct peak_usb_device *dev = usb_if->dev[ctrl_idx]; 531 struct net_device *netdev = dev->netdev; 532 struct can_frame *can_frame; 533 struct sk_buff *skb; 534 struct timeval tv; 535 struct skb_shared_hwtstamps *hwts; 536 537 skb = alloc_can_skb(netdev, &can_frame); 538 if (!skb) 539 return -ENOMEM; 540 541 can_frame->can_id = le32_to_cpu(rx->id); 542 can_frame->can_dlc = rx->len & 0x0f; 543 544 if (rx->flags & PCAN_USBPRO_EXT) 545 can_frame->can_id |= CAN_EFF_FLAG; 546 547 if (rx->flags & PCAN_USBPRO_RTR) 548 can_frame->can_id |= CAN_RTR_FLAG; 549 else 550 memcpy(can_frame->data, rx->data, can_frame->can_dlc); 551 552 peak_usb_get_ts_tv(&usb_if->time_ref, le32_to_cpu(rx->ts32), &tv); 553 hwts = skb_hwtstamps(skb); 554 hwts->hwtstamp = timeval_to_ktime(tv); 555 556 netdev->stats.rx_packets++; 557 netdev->stats.rx_bytes += can_frame->can_dlc; 558 netif_rx(skb); 559 560 return 0; 561 } 562 563 static int pcan_usb_pro_handle_error(struct pcan_usb_pro_interface *usb_if, 564 struct pcan_usb_pro_rxstatus *er) 565 { 566 const u16 raw_status = le16_to_cpu(er->status); 567 const unsigned int ctrl_idx = (er->channel >> 4) & 0x0f; 568 struct peak_usb_device *dev = usb_if->dev[ctrl_idx]; 569 struct net_device *netdev = dev->netdev; 570 struct can_frame *can_frame; 571 enum can_state new_state = CAN_STATE_ERROR_ACTIVE; 572 u8 err_mask = 0; 573 struct sk_buff *skb; 574 struct timeval tv; 575 struct skb_shared_hwtstamps *hwts; 576 577 /* nothing should be sent while in BUS_OFF state */ 578 if (dev->can.state == CAN_STATE_BUS_OFF) 579 return 0; 580 581 if (!raw_status) { 582 /* no error bit (back to active state) */ 583 dev->can.state = CAN_STATE_ERROR_ACTIVE; 584 return 0; 585 } 586 587 if (raw_status & (PCAN_USBPRO_STATUS_OVERRUN | 588 PCAN_USBPRO_STATUS_QOVERRUN)) { 589 /* trick to bypass next comparison and process other errors */ 590 new_state = CAN_STATE_MAX; 591 } 592 593 if (raw_status & PCAN_USBPRO_STATUS_BUS) { 594 new_state = CAN_STATE_BUS_OFF; 595 } else if (raw_status & PCAN_USBPRO_STATUS_ERROR) { 596 u32 rx_err_cnt = (le32_to_cpu(er->err_frm) & 0x00ff0000) >> 16; 597 u32 tx_err_cnt = (le32_to_cpu(er->err_frm) & 0xff000000) >> 24; 598 599 if (rx_err_cnt > 127) 600 err_mask |= CAN_ERR_CRTL_RX_PASSIVE; 601 else if (rx_err_cnt > 96) 602 err_mask |= CAN_ERR_CRTL_RX_WARNING; 603 604 if (tx_err_cnt > 127) 605 err_mask |= CAN_ERR_CRTL_TX_PASSIVE; 606 else if (tx_err_cnt > 96) 607 err_mask |= CAN_ERR_CRTL_TX_WARNING; 608 609 if (err_mask & (CAN_ERR_CRTL_RX_WARNING | 610 CAN_ERR_CRTL_TX_WARNING)) 611 new_state = CAN_STATE_ERROR_WARNING; 612 else if (err_mask & (CAN_ERR_CRTL_RX_PASSIVE | 613 CAN_ERR_CRTL_TX_PASSIVE)) 614 new_state = CAN_STATE_ERROR_PASSIVE; 615 } 616 617 /* donot post any error if current state didn't change */ 618 if (dev->can.state == new_state) 619 return 0; 620 621 /* allocate an skb to store the error frame */ 622 skb = alloc_can_err_skb(netdev, &can_frame); 623 if (!skb) 624 return -ENOMEM; 625 626 switch (new_state) { 627 case CAN_STATE_BUS_OFF: 628 can_frame->can_id |= CAN_ERR_BUSOFF; 629 dev->can.can_stats.bus_off++; 630 can_bus_off(netdev); 631 break; 632 633 case CAN_STATE_ERROR_PASSIVE: 634 can_frame->can_id |= CAN_ERR_CRTL; 635 can_frame->data[1] |= err_mask; 636 dev->can.can_stats.error_passive++; 637 break; 638 639 case CAN_STATE_ERROR_WARNING: 640 can_frame->can_id |= CAN_ERR_CRTL; 641 can_frame->data[1] |= err_mask; 642 dev->can.can_stats.error_warning++; 643 break; 644 645 case CAN_STATE_ERROR_ACTIVE: 646 break; 647 648 default: 649 /* CAN_STATE_MAX (trick to handle other errors) */ 650 if (raw_status & PCAN_USBPRO_STATUS_OVERRUN) { 651 can_frame->can_id |= CAN_ERR_PROT; 652 can_frame->data[2] |= CAN_ERR_PROT_OVERLOAD; 653 netdev->stats.rx_over_errors++; 654 netdev->stats.rx_errors++; 655 } 656 657 if (raw_status & PCAN_USBPRO_STATUS_QOVERRUN) { 658 can_frame->can_id |= CAN_ERR_CRTL; 659 can_frame->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW; 660 netdev->stats.rx_over_errors++; 661 netdev->stats.rx_errors++; 662 } 663 664 new_state = CAN_STATE_ERROR_ACTIVE; 665 break; 666 } 667 668 dev->can.state = new_state; 669 670 peak_usb_get_ts_tv(&usb_if->time_ref, le32_to_cpu(er->ts32), &tv); 671 hwts = skb_hwtstamps(skb); 672 hwts->hwtstamp = timeval_to_ktime(tv); 673 netdev->stats.rx_packets++; 674 netdev->stats.rx_bytes += can_frame->can_dlc; 675 netif_rx(skb); 676 677 return 0; 678 } 679 680 static void pcan_usb_pro_handle_ts(struct pcan_usb_pro_interface *usb_if, 681 struct pcan_usb_pro_rxts *ts) 682 { 683 /* should wait until clock is stabilized */ 684 if (usb_if->cm_ignore_count > 0) 685 usb_if->cm_ignore_count--; 686 else 687 peak_usb_set_ts_now(&usb_if->time_ref, 688 le32_to_cpu(ts->ts64[1])); 689 } 690 691 /* 692 * callback for bulk IN urb 693 */ 694 static int pcan_usb_pro_decode_buf(struct peak_usb_device *dev, struct urb *urb) 695 { 696 struct pcan_usb_pro_interface *usb_if = pcan_usb_pro_dev_if(dev); 697 struct net_device *netdev = dev->netdev; 698 struct pcan_usb_pro_msg usb_msg; 699 u8 *rec_ptr, *msg_end; 700 u16 rec_cnt; 701 int err = 0; 702 703 rec_ptr = pcan_msg_init(&usb_msg, urb->transfer_buffer, 704 urb->actual_length); 705 if (!rec_ptr) { 706 netdev_err(netdev, "bad msg hdr len %d\n", urb->actual_length); 707 return -EINVAL; 708 } 709 710 /* loop reading all the records from the incoming message */ 711 msg_end = urb->transfer_buffer + urb->actual_length; 712 rec_cnt = le16_to_cpu(*usb_msg.u.rec_cnt_rd); 713 for (; rec_cnt > 0; rec_cnt--) { 714 union pcan_usb_pro_rec *pr = (union pcan_usb_pro_rec *)rec_ptr; 715 u16 sizeof_rec = pcan_usb_pro_sizeof_rec[pr->data_type]; 716 717 if (!sizeof_rec) { 718 netdev_err(netdev, 719 "got unsupported rec in usb msg:\n"); 720 err = -ENOTSUPP; 721 break; 722 } 723 724 /* check if the record goes out of current packet */ 725 if (rec_ptr + sizeof_rec > msg_end) { 726 netdev_err(netdev, 727 "got frag rec: should inc usb rx buf size\n"); 728 err = -EBADMSG; 729 break; 730 } 731 732 switch (pr->data_type) { 733 case PCAN_USBPRO_RXMSG8: 734 case PCAN_USBPRO_RXMSG4: 735 case PCAN_USBPRO_RXMSG0: 736 case PCAN_USBPRO_RXRTR: 737 err = pcan_usb_pro_handle_canmsg(usb_if, &pr->rx_msg); 738 if (err < 0) 739 goto fail; 740 break; 741 742 case PCAN_USBPRO_RXSTATUS: 743 err = pcan_usb_pro_handle_error(usb_if, &pr->rx_status); 744 if (err < 0) 745 goto fail; 746 break; 747 748 case PCAN_USBPRO_RXTS: 749 pcan_usb_pro_handle_ts(usb_if, &pr->rx_ts); 750 break; 751 752 default: 753 netdev_err(netdev, 754 "unhandled rec type 0x%02x (%d): ignored\n", 755 pr->data_type, pr->data_type); 756 break; 757 } 758 759 rec_ptr += sizeof_rec; 760 } 761 762 fail: 763 if (err) 764 pcan_dump_mem("received msg", 765 urb->transfer_buffer, urb->actual_length); 766 767 return err; 768 } 769 770 static int pcan_usb_pro_encode_msg(struct peak_usb_device *dev, 771 struct sk_buff *skb, u8 *obuf, size_t *size) 772 { 773 struct can_frame *cf = (struct can_frame *)skb->data; 774 u8 data_type, len, flags; 775 struct pcan_usb_pro_msg usb_msg; 776 777 pcan_msg_init_empty(&usb_msg, obuf, *size); 778 779 if ((cf->can_id & CAN_RTR_FLAG) || (cf->can_dlc == 0)) 780 data_type = PCAN_USBPRO_TXMSG0; 781 else if (cf->can_dlc <= 4) 782 data_type = PCAN_USBPRO_TXMSG4; 783 else 784 data_type = PCAN_USBPRO_TXMSG8; 785 786 len = (dev->ctrl_idx << 4) | (cf->can_dlc & 0x0f); 787 788 flags = 0; 789 if (cf->can_id & CAN_EFF_FLAG) 790 flags |= 0x02; 791 if (cf->can_id & CAN_RTR_FLAG) 792 flags |= 0x01; 793 794 pcan_msg_add_rec(&usb_msg, data_type, 0, flags, len, cf->can_id, 795 cf->data); 796 797 *size = usb_msg.rec_buffer_len; 798 799 return 0; 800 } 801 802 static int pcan_usb_pro_start(struct peak_usb_device *dev) 803 { 804 struct pcan_usb_pro_device *pdev = 805 container_of(dev, struct pcan_usb_pro_device, dev); 806 int err; 807 808 err = pcan_usb_pro_set_silent(dev, 809 dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY); 810 if (err) 811 return err; 812 813 /* filter mode: 0-> All OFF; 1->bypass */ 814 err = pcan_usb_pro_set_filter(dev, 1); 815 if (err) 816 return err; 817 818 /* opening first device: */ 819 if (pdev->usb_if->dev_opened_count == 0) { 820 /* reset time_ref */ 821 peak_usb_init_time_ref(&pdev->usb_if->time_ref, &pcan_usb_pro); 822 823 /* ask device to send ts messages */ 824 err = pcan_usb_pro_set_ts(dev, 1); 825 } 826 827 pdev->usb_if->dev_opened_count++; 828 829 return err; 830 } 831 832 /* 833 * stop interface 834 * (last chance before set bus off) 835 */ 836 static int pcan_usb_pro_stop(struct peak_usb_device *dev) 837 { 838 struct pcan_usb_pro_device *pdev = 839 container_of(dev, struct pcan_usb_pro_device, dev); 840 841 /* turn off ts msgs for that interface if no other dev opened */ 842 if (pdev->usb_if->dev_opened_count == 1) 843 pcan_usb_pro_set_ts(dev, 0); 844 845 pdev->usb_if->dev_opened_count--; 846 847 return 0; 848 } 849 850 /* 851 * called when probing to initialize a device object. 852 */ 853 static int pcan_usb_pro_init(struct peak_usb_device *dev) 854 { 855 struct pcan_usb_pro_device *pdev = 856 container_of(dev, struct pcan_usb_pro_device, dev); 857 struct pcan_usb_pro_interface *usb_if = NULL; 858 struct pcan_usb_pro_fwinfo *fi = NULL; 859 struct pcan_usb_pro_blinfo *bi = NULL; 860 int err; 861 862 /* do this for 1st channel only */ 863 if (!dev->prev_siblings) { 864 /* allocate netdevices common structure attached to first one */ 865 usb_if = kzalloc(sizeof(struct pcan_usb_pro_interface), 866 GFP_KERNEL); 867 fi = kmalloc(sizeof(struct pcan_usb_pro_fwinfo), GFP_KERNEL); 868 bi = kmalloc(sizeof(struct pcan_usb_pro_blinfo), GFP_KERNEL); 869 if (!usb_if || !fi || !bi) { 870 err = -ENOMEM; 871 goto err_out; 872 } 873 874 /* number of ts msgs to ignore before taking one into account */ 875 usb_if->cm_ignore_count = 5; 876 877 /* 878 * explicit use of dev_xxx() instead of netdev_xxx() here: 879 * information displayed are related to the device itself, not 880 * to the canx netdevices. 881 */ 882 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO, 883 PCAN_USBPRO_INFO_FW, 884 fi, sizeof(*fi)); 885 if (err) { 886 dev_err(dev->netdev->dev.parent, 887 "unable to read %s firmware info (err %d)\n", 888 pcan_usb_pro.name, err); 889 goto err_out; 890 } 891 892 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO, 893 PCAN_USBPRO_INFO_BL, 894 bi, sizeof(*bi)); 895 if (err) { 896 dev_err(dev->netdev->dev.parent, 897 "unable to read %s bootloader info (err %d)\n", 898 pcan_usb_pro.name, err); 899 goto err_out; 900 } 901 902 /* tell the device the can driver is running */ 903 err = pcan_usb_pro_drv_loaded(dev, 1); 904 if (err) 905 goto err_out; 906 907 dev_info(dev->netdev->dev.parent, 908 "PEAK-System %s hwrev %u serial %08X.%08X (%u channels)\n", 909 pcan_usb_pro.name, 910 bi->hw_rev, bi->serial_num_hi, bi->serial_num_lo, 911 pcan_usb_pro.ctrl_count); 912 } else { 913 usb_if = pcan_usb_pro_dev_if(dev->prev_siblings); 914 } 915 916 pdev->usb_if = usb_if; 917 usb_if->dev[dev->ctrl_idx] = dev; 918 919 /* set LED in default state (end of init phase) */ 920 pcan_usb_pro_set_led(dev, 0, 1); 921 922 kfree(bi); 923 kfree(fi); 924 925 return 0; 926 927 err_out: 928 kfree(bi); 929 kfree(fi); 930 kfree(usb_if); 931 932 return err; 933 } 934 935 static void pcan_usb_pro_exit(struct peak_usb_device *dev) 936 { 937 struct pcan_usb_pro_device *pdev = 938 container_of(dev, struct pcan_usb_pro_device, dev); 939 940 /* 941 * when rmmod called before unplug and if down, should reset things 942 * before leaving 943 */ 944 if (dev->can.state != CAN_STATE_STOPPED) { 945 /* set bus off on the corresponding channel */ 946 pcan_usb_pro_set_bus(dev, 0); 947 } 948 949 /* if channel #0 (only) */ 950 if (dev->ctrl_idx == 0) { 951 /* turn off calibration message if any device were opened */ 952 if (pdev->usb_if->dev_opened_count > 0) 953 pcan_usb_pro_set_ts(dev, 0); 954 955 /* tell the PCAN-USB Pro device the driver is being unloaded */ 956 pcan_usb_pro_drv_loaded(dev, 0); 957 } 958 } 959 960 /* 961 * called when PCAN-USB Pro adapter is unplugged 962 */ 963 static void pcan_usb_pro_free(struct peak_usb_device *dev) 964 { 965 /* last device: can free pcan_usb_pro_interface object now */ 966 if (!dev->prev_siblings && !dev->next_siblings) 967 kfree(pcan_usb_pro_dev_if(dev)); 968 } 969 970 /* 971 * probe function for new PCAN-USB Pro usb interface 972 */ 973 int pcan_usb_pro_probe(struct usb_interface *intf) 974 { 975 struct usb_host_interface *if_desc; 976 int i; 977 978 if_desc = intf->altsetting; 979 980 /* check interface endpoint addresses */ 981 for (i = 0; i < if_desc->desc.bNumEndpoints; i++) { 982 struct usb_endpoint_descriptor *ep = &if_desc->endpoint[i].desc; 983 984 /* 985 * below is the list of valid ep addreses. Any other ep address 986 * is considered as not-CAN interface address => no dev created 987 */ 988 switch (ep->bEndpointAddress) { 989 case PCAN_USBPRO_EP_CMDOUT: 990 case PCAN_USBPRO_EP_CMDIN: 991 case PCAN_USBPRO_EP_MSGOUT_0: 992 case PCAN_USBPRO_EP_MSGOUT_1: 993 case PCAN_USBPRO_EP_MSGIN: 994 case PCAN_USBPRO_EP_UNUSED: 995 break; 996 default: 997 return -ENODEV; 998 } 999 } 1000 1001 return 0; 1002 } 1003 1004 /* 1005 * describe the PCAN-USB Pro adapter 1006 */ 1007 static const struct can_bittiming_const pcan_usb_pro_const = { 1008 .name = "pcan_usb_pro", 1009 .tseg1_min = 1, 1010 .tseg1_max = 16, 1011 .tseg2_min = 1, 1012 .tseg2_max = 8, 1013 .sjw_max = 4, 1014 .brp_min = 1, 1015 .brp_max = 1024, 1016 .brp_inc = 1, 1017 }; 1018 1019 const struct peak_usb_adapter pcan_usb_pro = { 1020 .name = "PCAN-USB Pro", 1021 .device_id = PCAN_USBPRO_PRODUCT_ID, 1022 .ctrl_count = PCAN_USBPRO_CHANNEL_COUNT, 1023 .ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY, 1024 .clock = { 1025 .freq = PCAN_USBPRO_CRYSTAL_HZ, 1026 }, 1027 .bittiming_const = &pcan_usb_pro_const, 1028 1029 /* size of device private data */ 1030 .sizeof_dev_private = sizeof(struct pcan_usb_pro_device), 1031 1032 /* timestamps usage */ 1033 .ts_used_bits = 32, 1034 .ts_period = 1000000, /* calibration period in ts. */ 1035 .us_per_ts_scale = 1, /* us = (ts * scale) >> shift */ 1036 .us_per_ts_shift = 0, 1037 1038 /* give here messages in/out endpoints */ 1039 .ep_msg_in = PCAN_USBPRO_EP_MSGIN, 1040 .ep_msg_out = {PCAN_USBPRO_EP_MSGOUT_0, PCAN_USBPRO_EP_MSGOUT_1}, 1041 1042 /* size of rx/tx usb buffers */ 1043 .rx_buffer_size = PCAN_USBPRO_RX_BUFFER_SIZE, 1044 .tx_buffer_size = PCAN_USBPRO_TX_BUFFER_SIZE, 1045 1046 /* device callbacks */ 1047 .intf_probe = pcan_usb_pro_probe, 1048 .dev_init = pcan_usb_pro_init, 1049 .dev_exit = pcan_usb_pro_exit, 1050 .dev_free = pcan_usb_pro_free, 1051 .dev_set_bus = pcan_usb_pro_set_bus, 1052 .dev_set_bittiming = pcan_usb_pro_set_bittiming, 1053 .dev_get_device_id = pcan_usb_pro_get_device_id, 1054 .dev_decode_buf = pcan_usb_pro_decode_buf, 1055 .dev_encode_msg = pcan_usb_pro_encode_msg, 1056 .dev_start = pcan_usb_pro_start, 1057 .dev_stop = pcan_usb_pro_stop, 1058 .dev_restart_async = pcan_usb_pro_restart_async, 1059 }; 1060