drivers/net/can/usb/peak_usb/pcan_usb_pro.c

   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                 /* fall through */
 145         case PCAN_USBPRO_TXMSG4:
 146                 i += 4;
 147                 /* fall through */
 148         case PCAN_USBPRO_TXMSG0:
 149                 *pc++ = va_arg(ap, int);
 150                 *pc++ = va_arg(ap, int);
 151                 *pc++ = va_arg(ap, int);
 152                 *(__le32 *)pc = cpu_to_le32(va_arg(ap, u32));
 153                 pc += 4;
 154                 memcpy(pc, va_arg(ap, int *), i);
 155                 pc += i;
 156                 break;
 157
 158         case PCAN_USBPRO_SETBTR:
 159         case PCAN_USBPRO_GETDEVID:
 160                 *pc++ = va_arg(ap, int);
 161                 pc += 2;
 162                 *(__le32 *)pc = cpu_to_le32(va_arg(ap, u32));
 163                 pc += 4;
 164                 break;
 165
 166         case PCAN_USBPRO_SETFILTR:
 167         case PCAN_USBPRO_SETBUSACT:
 168         case PCAN_USBPRO_SETSILENT:
 169                 *pc++ = va_arg(ap, int);
 170                 *(__le16 *)pc = cpu_to_le16(va_arg(ap, int));
 171                 pc += 2;
 172                 break;
 173
 174         case PCAN_USBPRO_SETLED:
 175                 *pc++ = va_arg(ap, int);
 176                 *(__le16 *)pc = cpu_to_le16(va_arg(ap, int));
 177                 pc += 2;
 178                 *(__le32 *)pc = cpu_to_le32(va_arg(ap, u32));
 179                 pc += 4;
 180                 break;
 181
 182         case PCAN_USBPRO_SETTS:
 183                 pc++;
 184                 *(__le16 *)pc = cpu_to_le16(va_arg(ap, int));
 185                 pc += 2;
 186                 break;
 187
 188         default:
 189                 pr_err("%s: %s(): unknown data type %02Xh (%d)\n",
 190                         PCAN_USB_DRIVER_NAME, __func__, id, id);
 191                 pc--;
 192                 break;
 193         }
 194
 195         len = pc - pm->rec_ptr;
 196         if (len > 0) {
 197                 *pm->u.rec_cnt = cpu_to_le32(le32_to_cpu(*pm->u.rec_cnt) + 1);
 198                 *pm->rec_ptr = id;
 199
 200                 pm->rec_ptr = pc;
 201                 pm->rec_buffer_len += len;
 202         }
 203
 204         va_end(ap);
 205
 206         return len;
 207 }
 208
 209 /*
 210  * send PCAN-USB Pro command synchronously
 211  */
 212 static int pcan_usb_pro_send_cmd(struct peak_usb_device *dev,
 213                                  struct pcan_usb_pro_msg *pum)
 214 {
 215         int actual_length;
 216         int err;
 217
 218         /* usb device unregistered? */
 219         if (!(dev->state & PCAN_USB_STATE_CONNECTED))
 220                 return 0;
 221
 222         err = usb_bulk_msg(dev->udev,
 223                 usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT),
 224                 pum->u.rec_buffer, pum->rec_buffer_len,
 225                 &actual_length, PCAN_USBPRO_COMMAND_TIMEOUT);
 226         if (err)
 227                 netdev_err(dev->netdev, "sending command failure: %d\n", err);
 228
 229         return err;
 230 }
 231
 232 /*
 233  * wait for PCAN-USB Pro command response
 234  */
 235 static int pcan_usb_pro_wait_rsp(struct peak_usb_device *dev,
 236                                  struct pcan_usb_pro_msg *pum)
 237 {
 238         u8 req_data_type, req_channel;
 239         int actual_length;
 240         int i, err = 0;
 241
 242         /* usb device unregistered? */
 243         if (!(dev->state & PCAN_USB_STATE_CONNECTED))
 244                 return 0;
 245
 246         req_data_type = pum->u.rec_buffer[4];
 247         req_channel = pum->u.rec_buffer[5];
 248
 249         *pum->u.rec_cnt = 0;
 250         for (i = 0; !err && i < PCAN_USBPRO_RSP_SUBMIT_MAX; i++) {
 251                 struct pcan_usb_pro_msg rsp;
 252                 union pcan_usb_pro_rec *pr;
 253                 u32 r, rec_cnt;
 254                 u16 rec_len;
 255                 u8 *pc;
 256
 257                 err = usb_bulk_msg(dev->udev,
 258                         usb_rcvbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDIN),
 259                         pum->u.rec_buffer, pum->rec_buffer_len,
 260                         &actual_length, PCAN_USBPRO_COMMAND_TIMEOUT);
 261                 if (err) {
 262                         netdev_err(dev->netdev, "waiting rsp error %d\n", err);
 263                         break;
 264                 }
 265
 266                 if (actual_length == 0)
 267                         continue;
 268
 269                 err = -EBADMSG;
 270                 if (actual_length < PCAN_USBPRO_MSG_HEADER_LEN) {
 271                         netdev_err(dev->netdev,
 272                                    "got abnormal too small rsp (len=%d)\n",
 273                                    actual_length);
 274                         break;
 275                 }
 276
 277                 pc = pcan_msg_init(&rsp, pum->u.rec_buffer,
 278                         actual_length);
 279
 280                 rec_cnt = le32_to_cpu(*rsp.u.rec_cnt);
 281
 282                 /* loop on records stored into message */
 283                 for (r = 0; r < rec_cnt; r++) {
 284                         pr = (union pcan_usb_pro_rec *)pc;
 285                         rec_len = pcan_usb_pro_sizeof_rec[pr->data_type];
 286                         if (!rec_len) {
 287                                 netdev_err(dev->netdev,
 288                                            "got unprocessed record in msg\n");
 289                                 pcan_dump_mem("rcvd rsp msg", pum->u.rec_buffer,
 290                                               actual_length);
 291                                 break;
 292                         }
 293
 294                         /* check if response corresponds to request */
 295                         if (pr->data_type != req_data_type)
 296                                 netdev_err(dev->netdev,
 297                                            "got unwanted rsp %xh: ignored\n",
 298                                            pr->data_type);
 299
 300                         /* check if channel in response corresponds too */
 301                         else if ((req_channel != 0xff) && \
 302                                 (pr->bus_act.channel != req_channel))
 303                                 netdev_err(dev->netdev,
 304                                         "got rsp %xh but on chan%u: ignored\n",
 305                                         req_data_type, pr->bus_act.channel);
 306
 307                         /* got the response */
 308                         else
 309                                 return 0;
 310
 311                         /* otherwise, go on with next record in message */
 312                         pc += rec_len;
 313                 }
 314         }
 315
 316         return (i >= PCAN_USBPRO_RSP_SUBMIT_MAX) ? -ERANGE : err;
 317 }
 318
 319 int pcan_usb_pro_send_req(struct peak_usb_device *dev, int req_id,
 320                           int req_value, void *req_addr, int req_size)
 321 {
 322         int err;
 323         u8 req_type;
 324         unsigned int p;
 325
 326         /* usb device unregistered? */
 327         if (!(dev->state & PCAN_USB_STATE_CONNECTED))
 328                 return 0;
 329
 330         req_type = USB_TYPE_VENDOR | USB_RECIP_OTHER;
 331
 332         switch (req_id) {
 333         case PCAN_USBPRO_REQ_FCT:
 334                 p = usb_sndctrlpipe(dev->udev, 0);
 335                 break;
 336
 337         default:
 338                 p = usb_rcvctrlpipe(dev->udev, 0);
 339                 req_type |= USB_DIR_IN;
 340                 memset(req_addr, '\0', req_size);
 341                 break;
 342         }
 343
 344         err = usb_control_msg(dev->udev, p, req_id, req_type, req_value, 0,
 345                               req_addr, req_size, 2 * USB_CTRL_GET_TIMEOUT);
 346         if (err < 0) {
 347                 netdev_info(dev->netdev,
 348                             "unable to request usb[type=%d value=%d] err=%d\n",
 349                             req_id, req_value, err);
 350                 return err;
 351         }
 352
 353         return 0;
 354 }
 355
 356 static int pcan_usb_pro_set_ts(struct peak_usb_device *dev, u16 onoff)
 357 {
 358         struct pcan_usb_pro_msg um;
 359
 360         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 361         pcan_msg_add_rec(&um, PCAN_USBPRO_SETTS, onoff);
 362
 363         return pcan_usb_pro_send_cmd(dev, &um);
 364 }
 365
 366 static int pcan_usb_pro_set_bitrate(struct peak_usb_device *dev, u32 ccbt)
 367 {
 368         struct pcan_usb_pro_device *pdev =
 369                         container_of(dev, struct pcan_usb_pro_device, dev);
 370         struct pcan_usb_pro_msg um;
 371
 372         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 373         pcan_msg_add_rec(&um, PCAN_USBPRO_SETBTR, dev->ctrl_idx, ccbt);
 374
 375         /* cache the CCBT value to reuse it before next buson */
 376         pdev->cached_ccbt = ccbt;
 377
 378         return pcan_usb_pro_send_cmd(dev, &um);
 379 }
 380
 381 static int pcan_usb_pro_set_bus(struct peak_usb_device *dev, u8 onoff)
 382 {
 383         struct pcan_usb_pro_msg um;
 384
 385         /* if bus=on, be sure the bitrate being set before! */
 386         if (onoff) {
 387                 struct pcan_usb_pro_device *pdev =
 388                              container_of(dev, struct pcan_usb_pro_device, dev);
 389
 390                 pcan_usb_pro_set_bitrate(dev, pdev->cached_ccbt);
 391         }
 392
 393         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 394         pcan_msg_add_rec(&um, PCAN_USBPRO_SETBUSACT, dev->ctrl_idx, onoff);
 395
 396         return pcan_usb_pro_send_cmd(dev, &um);
 397 }
 398
 399 static int pcan_usb_pro_set_silent(struct peak_usb_device *dev, u8 onoff)
 400 {
 401         struct pcan_usb_pro_msg um;
 402
 403         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 404         pcan_msg_add_rec(&um, PCAN_USBPRO_SETSILENT, dev->ctrl_idx, onoff);
 405
 406         return pcan_usb_pro_send_cmd(dev, &um);
 407 }
 408
 409 static int pcan_usb_pro_set_filter(struct peak_usb_device *dev, u16 filter_mode)
 410 {
 411         struct pcan_usb_pro_msg um;
 412
 413         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 414         pcan_msg_add_rec(&um, PCAN_USBPRO_SETFILTR, dev->ctrl_idx, filter_mode);
 415
 416         return pcan_usb_pro_send_cmd(dev, &um);
 417 }
 418
 419 static int pcan_usb_pro_set_led(struct peak_usb_device *dev, u8 mode,
 420                                 u32 timeout)
 421 {
 422         struct pcan_usb_pro_msg um;
 423
 424         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 425         pcan_msg_add_rec(&um, PCAN_USBPRO_SETLED, dev->ctrl_idx, mode, timeout);
 426
 427         return pcan_usb_pro_send_cmd(dev, &um);
 428 }
 429
 430 static int pcan_usb_pro_get_device_id(struct peak_usb_device *dev,
 431                                       u32 *device_id)
 432 {
 433         struct pcan_usb_pro_devid *pdn;
 434         struct pcan_usb_pro_msg um;
 435         int err;
 436         u8 *pc;
 437
 438         pc = pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 439         pcan_msg_add_rec(&um, PCAN_USBPRO_GETDEVID, dev->ctrl_idx);
 440
 441         err =  pcan_usb_pro_send_cmd(dev, &um);
 442         if (err)
 443                 return err;
 444
 445         err = pcan_usb_pro_wait_rsp(dev, &um);
 446         if (err)
 447                 return err;
 448
 449         pdn = (struct pcan_usb_pro_devid *)pc;
 450         if (device_id)
 451                 *device_id = le32_to_cpu(pdn->serial_num);
 452
 453         return err;
 454 }
 455
 456 static int pcan_usb_pro_set_bittiming(struct peak_usb_device *dev,
 457                                       struct can_bittiming *bt)
 458 {
 459         u32 ccbt;
 460
 461         ccbt = (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) ? 0x00800000 : 0;
 462         ccbt |= (bt->sjw - 1) << 24;
 463         ccbt |= (bt->phase_seg2 - 1) << 20;
 464         ccbt |= (bt->prop_seg + bt->phase_seg1 - 1) << 16; /* = tseg1 */
 465         ccbt |= bt->brp - 1;
 466
 467         netdev_info(dev->netdev, "setting ccbt=0x%08x\n", ccbt);
 468
 469         return pcan_usb_pro_set_bitrate(dev, ccbt);
 470 }
 471
 472 void pcan_usb_pro_restart_complete(struct urb *urb)
 473 {
 474         /* can delete usb resources */
 475         peak_usb_async_complete(urb);
 476
 477         /* notify candev and netdev */
 478         peak_usb_restart_complete(urb->context);
 479 }
 480
 481 /*
 482  * handle restart but in asynchronously way
 483  */
 484 static int pcan_usb_pro_restart_async(struct peak_usb_device *dev,
 485                                       struct urb *urb, u8 *buf)
 486 {
 487         struct pcan_usb_pro_msg um;
 488
 489         pcan_msg_init_empty(&um, buf, PCAN_USB_MAX_CMD_LEN);
 490         pcan_msg_add_rec(&um, PCAN_USBPRO_SETBUSACT, dev->ctrl_idx, 1);
 491
 492         usb_fill_bulk_urb(urb, dev->udev,
 493                         usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT),
 494                         buf, PCAN_USB_MAX_CMD_LEN,
 495                         pcan_usb_pro_restart_complete, dev);
 496
 497         return usb_submit_urb(urb, GFP_ATOMIC);
 498 }
 499
 500 static int pcan_usb_pro_drv_loaded(struct peak_usb_device *dev, int loaded)
 501 {
 502         u8 *buffer;
 503         int err;
 504
 505         buffer = kzalloc(PCAN_USBPRO_FCT_DRVLD_REQ_LEN, GFP_KERNEL);
 506         if (!buffer)
 507                 return -ENOMEM;
 508
 509         buffer[0] = 0;
 510         buffer[1] = !!loaded;
 511
 512         err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_FCT,
 513                                     PCAN_USBPRO_FCT_DRVLD, buffer,
 514                                     PCAN_USBPRO_FCT_DRVLD_REQ_LEN);
 515         kfree(buffer);
 516
 517         return err;
 518 }
 519
 520 static inline
 521 struct pcan_usb_pro_interface *pcan_usb_pro_dev_if(struct peak_usb_device *dev)
 522 {
 523         struct pcan_usb_pro_device *pdev =
 524                         container_of(dev, struct pcan_usb_pro_device, dev);
 525         return pdev->usb_if;
 526 }
 527
 528 static int pcan_usb_pro_handle_canmsg(struct pcan_usb_pro_interface *usb_if,
 529                                       struct pcan_usb_pro_rxmsg *rx)
 530 {
 531         const unsigned int ctrl_idx = (rx->len >> 4) & 0x0f;
 532         struct peak_usb_device *dev = usb_if->dev[ctrl_idx];
 533         struct net_device *netdev = dev->netdev;
 534         struct can_frame *can_frame;
 535         struct sk_buff *skb;
 536         struct skb_shared_hwtstamps *hwts;
 537
 538         skb = alloc_can_skb(netdev, &can_frame);
 539         if (!skb)
 540                 return -ENOMEM;
 541
 542         can_frame->can_id = le32_to_cpu(rx->id);
 543         can_frame->can_dlc = rx->len & 0x0f;
 544
 545         if (rx->flags & PCAN_USBPRO_EXT)
 546                 can_frame->can_id |= CAN_EFF_FLAG;
 547
 548         if (rx->flags & PCAN_USBPRO_RTR)
 549                 can_frame->can_id |= CAN_RTR_FLAG;
 550         else
 551                 memcpy(can_frame->data, rx->data, can_frame->can_dlc);
 552
 553         hwts = skb_hwtstamps(skb);
 554         peak_usb_get_ts_time(&usb_if->time_ref, le32_to_cpu(rx->ts32),
 555                              &hwts->hwtstamp);
 556
 557         netdev->stats.rx_packets++;
 558         netdev->stats.rx_bytes += can_frame->can_dlc;
 559         netif_rx(skb);
 560
 561         return 0;
 562 }
 563
 564 static int pcan_usb_pro_handle_error(struct pcan_usb_pro_interface *usb_if,
 565                                      struct pcan_usb_pro_rxstatus *er)
 566 {
 567         const u16 raw_status = le16_to_cpu(er->status);
 568         const unsigned int ctrl_idx = (er->channel >> 4) & 0x0f;
 569         struct peak_usb_device *dev = usb_if->dev[ctrl_idx];
 570         struct net_device *netdev = dev->netdev;
 571         struct can_frame *can_frame;
 572         enum can_state new_state = CAN_STATE_ERROR_ACTIVE;
 573         u8 err_mask = 0;
 574         struct sk_buff *skb;
 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         hwts = skb_hwtstamps(skb);
 671         peak_usb_get_ts_time(&usb_if->time_ref, le32_to_cpu(er->ts32), &hwts->hwtstamp);
 672         netdev->stats.rx_packets++;
 673         netdev->stats.rx_bytes += can_frame->can_dlc;
 674         netif_rx(skb);
 675
 676         return 0;
 677 }
 678
 679 static void pcan_usb_pro_handle_ts(struct pcan_usb_pro_interface *usb_if,
 680                                    struct pcan_usb_pro_rxts *ts)
 681 {
 682         /* should wait until clock is stabilized */
 683         if (usb_if->cm_ignore_count > 0)
 684                 usb_if->cm_ignore_count--;
 685         else
 686                 peak_usb_set_ts_now(&usb_if->time_ref,
 687                                     le32_to_cpu(ts->ts64[1]));
 688 }
 689
 690 /*
 691  * callback for bulk IN urb
 692  */
 693 static int pcan_usb_pro_decode_buf(struct peak_usb_device *dev, struct urb *urb)
 694 {
 695         struct pcan_usb_pro_interface *usb_if = pcan_usb_pro_dev_if(dev);
 696         struct net_device *netdev = dev->netdev;
 697         struct pcan_usb_pro_msg usb_msg;
 698         u8 *rec_ptr, *msg_end;
 699         u16 rec_cnt;
 700         int err = 0;
 701
 702         rec_ptr = pcan_msg_init(&usb_msg, urb->transfer_buffer,
 703                                         urb->actual_length);
 704         if (!rec_ptr) {
 705                 netdev_err(netdev, "bad msg hdr len %d\n", urb->actual_length);
 706                 return -EINVAL;
 707         }
 708
 709         /* loop reading all the records from the incoming message */
 710         msg_end = urb->transfer_buffer + urb->actual_length;
 711         rec_cnt = le16_to_cpu(*usb_msg.u.rec_cnt_rd);
 712         for (; rec_cnt > 0; rec_cnt--) {
 713                 union pcan_usb_pro_rec *pr = (union pcan_usb_pro_rec *)rec_ptr;
 714                 u16 sizeof_rec = pcan_usb_pro_sizeof_rec[pr->data_type];
 715
 716                 if (!sizeof_rec) {
 717                         netdev_err(netdev,
 718                                    "got unsupported rec in usb msg:\n");
 719                         err = -ENOTSUPP;
 720                         break;
 721                 }
 722
 723                 /* check if the record goes out of current packet */
 724                 if (rec_ptr + sizeof_rec > msg_end) {
 725                         netdev_err(netdev,
 726                                 "got frag rec: should inc usb rx buf size\n");
 727                         err = -EBADMSG;
 728                         break;
 729                 }
 730
 731                 switch (pr->data_type) {
 732                 case PCAN_USBPRO_RXMSG8:
 733                 case PCAN_USBPRO_RXMSG4:
 734                 case PCAN_USBPRO_RXMSG0:
 735                 case PCAN_USBPRO_RXRTR:
 736                         err = pcan_usb_pro_handle_canmsg(usb_if, &pr->rx_msg);
 737                         if (err < 0)
 738                                 goto fail;
 739                         break;
 740
 741                 case PCAN_USBPRO_RXSTATUS:
 742                         err = pcan_usb_pro_handle_error(usb_if, &pr->rx_status);
 743                         if (err < 0)
 744                                 goto fail;
 745                         break;
 746
 747                 case PCAN_USBPRO_RXTS:
 748                         pcan_usb_pro_handle_ts(usb_if, &pr->rx_ts);
 749                         break;
 750
 751                 default:
 752                         netdev_err(netdev,
 753                                    "unhandled rec type 0x%02x (%d): ignored\n",
 754                                    pr->data_type, pr->data_type);
 755                         break;
 756                 }
 757
 758                 rec_ptr += sizeof_rec;
 759         }
 760
 761 fail:
 762         if (err)
 763                 pcan_dump_mem("received msg",
 764                               urb->transfer_buffer, urb->actual_length);
 765
 766         return err;
 767 }
 768
 769 static int pcan_usb_pro_encode_msg(struct peak_usb_device *dev,
 770                                    struct sk_buff *skb, u8 *obuf, size_t *size)
 771 {
 772         struct can_frame *cf = (struct can_frame *)skb->data;
 773         u8 data_type, len, flags;
 774         struct pcan_usb_pro_msg usb_msg;
 775
 776         pcan_msg_init_empty(&usb_msg, obuf, *size);
 777
 778         if ((cf->can_id & CAN_RTR_FLAG) || (cf->can_dlc == 0))
 779                 data_type = PCAN_USBPRO_TXMSG0;
 780         else if (cf->can_dlc <= 4)
 781                 data_type = PCAN_USBPRO_TXMSG4;
 782         else
 783                 data_type = PCAN_USBPRO_TXMSG8;
 784
 785         len = (dev->ctrl_idx << 4) | (cf->can_dlc & 0x0f);
 786
 787         flags = 0;
 788         if (cf->can_id & CAN_EFF_FLAG)
 789                 flags |= 0x02;
 790         if (cf->can_id & CAN_RTR_FLAG)
 791                 flags |= 0x01;
 792
 793         pcan_msg_add_rec(&usb_msg, data_type, 0, flags, len, cf->can_id,
 794                          cf->data);
 795
 796         *size = usb_msg.rec_buffer_len;
 797
 798         return 0;
 799 }
 800
 801 static int pcan_usb_pro_start(struct peak_usb_device *dev)
 802 {
 803         struct pcan_usb_pro_device *pdev =
 804                         container_of(dev, struct pcan_usb_pro_device, dev);
 805         int err;
 806
 807         err = pcan_usb_pro_set_silent(dev,
 808                                 dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY);
 809         if (err)
 810                 return err;
 811
 812         /* filter mode: 0-> All OFF; 1->bypass */
 813         err = pcan_usb_pro_set_filter(dev, 1);
 814         if (err)
 815                 return err;
 816
 817         /* opening first device: */
 818         if (pdev->usb_if->dev_opened_count == 0) {
 819                 /* reset time_ref */
 820                 peak_usb_init_time_ref(&pdev->usb_if->time_ref, &pcan_usb_pro);
 821
 822                 /* ask device to send ts messages */
 823                 err = pcan_usb_pro_set_ts(dev, 1);
 824         }
 825
 826         pdev->usb_if->dev_opened_count++;
 827
 828         return err;
 829 }
 830
 831 /*
 832  * stop interface
 833  * (last chance before set bus off)
 834  */
 835 static int pcan_usb_pro_stop(struct peak_usb_device *dev)
 836 {
 837         struct pcan_usb_pro_device *pdev =
 838                         container_of(dev, struct pcan_usb_pro_device, dev);
 839
 840         /* turn off ts msgs for that interface if no other dev opened */
 841         if (pdev->usb_if->dev_opened_count == 1)
 842                 pcan_usb_pro_set_ts(dev, 0);
 843
 844         pdev->usb_if->dev_opened_count--;
 845
 846         return 0;
 847 }
 848
 849 /*
 850  * called when probing to initialize a device object.
 851  */
 852 static int pcan_usb_pro_init(struct peak_usb_device *dev)
 853 {
 854         struct pcan_usb_pro_device *pdev =
 855                         container_of(dev, struct pcan_usb_pro_device, dev);
 856         struct pcan_usb_pro_interface *usb_if = NULL;
 857         struct pcan_usb_pro_fwinfo *fi = NULL;
 858         struct pcan_usb_pro_blinfo *bi = NULL;
 859         int err;
 860
 861         /* do this for 1st channel only */
 862         if (!dev->prev_siblings) {
 863                 /* allocate netdevices common structure attached to first one */
 864                 usb_if = kzalloc(sizeof(struct pcan_usb_pro_interface),
 865                                  GFP_KERNEL);
 866                 fi = kmalloc(sizeof(struct pcan_usb_pro_fwinfo), GFP_KERNEL);
 867                 bi = kmalloc(sizeof(struct pcan_usb_pro_blinfo), GFP_KERNEL);
 868                 if (!usb_if || !fi || !bi) {
 869                         err = -ENOMEM;
 870                         goto err_out;
 871                 }
 872
 873                 /* number of ts msgs to ignore before taking one into account */
 874                 usb_if->cm_ignore_count = 5;
 875
 876                 /*
 877                  * explicit use of dev_xxx() instead of netdev_xxx() here:
 878                  * information displayed are related to the device itself, not
 879                  * to the canx netdevices.
 880                  */
 881                 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
 882                                             PCAN_USBPRO_INFO_FW,
 883                                             fi, sizeof(*fi));
 884                 if (err) {
 885                         dev_err(dev->netdev->dev.parent,
 886                                 "unable to read %s firmware info (err %d)\n",
 887                                 pcan_usb_pro.name, err);
 888                         goto err_out;
 889                 }
 890
 891                 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
 892                                             PCAN_USBPRO_INFO_BL,
 893                                             bi, sizeof(*bi));
 894                 if (err) {
 895                         dev_err(dev->netdev->dev.parent,
 896                                 "unable to read %s bootloader info (err %d)\n",
 897                                 pcan_usb_pro.name, err);
 898                         goto err_out;
 899                 }
 900
 901                 /* tell the device the can driver is running */
 902                 err = pcan_usb_pro_drv_loaded(dev, 1);
 903                 if (err)
 904                         goto err_out;
 905
 906                 dev_info(dev->netdev->dev.parent,
 907                      "PEAK-System %s hwrev %u serial %08X.%08X (%u channels)\n",
 908                      pcan_usb_pro.name,
 909                      bi->hw_rev, bi->serial_num_hi, bi->serial_num_lo,
 910                      pcan_usb_pro.ctrl_count);
 911         } else {
 912                 usb_if = pcan_usb_pro_dev_if(dev->prev_siblings);
 913         }
 914
 915         pdev->usb_if = usb_if;
 916         usb_if->dev[dev->ctrl_idx] = dev;
 917
 918         /* set LED in default state (end of init phase) */
 919         pcan_usb_pro_set_led(dev, 0, 1);
 920
 921         kfree(bi);
 922         kfree(fi);
 923
 924         return 0;
 925
 926  err_out:
 927         kfree(bi);
 928         kfree(fi);
 929         kfree(usb_if);
 930
 931         return err;
 932 }
 933
 934 static void pcan_usb_pro_exit(struct peak_usb_device *dev)
 935 {
 936         struct pcan_usb_pro_device *pdev =
 937                         container_of(dev, struct pcan_usb_pro_device, dev);
 938
 939         /*
 940          * when rmmod called before unplug and if down, should reset things
 941          * before leaving
 942          */
 943         if (dev->can.state != CAN_STATE_STOPPED) {
 944                 /* set bus off on the corresponding channel */
 945                 pcan_usb_pro_set_bus(dev, 0);
 946         }
 947
 948         /* if channel #0 (only) */
 949         if (dev->ctrl_idx == 0) {
 950                 /* turn off calibration message if any device were opened */
 951                 if (pdev->usb_if->dev_opened_count > 0)
 952                         pcan_usb_pro_set_ts(dev, 0);
 953
 954                 /* tell the PCAN-USB Pro device the driver is being unloaded */
 955                 pcan_usb_pro_drv_loaded(dev, 0);
 956         }
 957 }
 958
 959 /*
 960  * called when PCAN-USB Pro adapter is unplugged
 961  */
 962 static void pcan_usb_pro_free(struct peak_usb_device *dev)
 963 {
 964         /* last device: can free pcan_usb_pro_interface object now */
 965         if (!dev->prev_siblings && !dev->next_siblings)
 966                 kfree(pcan_usb_pro_dev_if(dev));
 967 }
 968
 969 /*
 970  * probe function for new PCAN-USB Pro usb interface
 971  */
 972 int pcan_usb_pro_probe(struct usb_interface *intf)
 973 {
 974         struct usb_host_interface *if_desc;
 975         int i;
 976
 977         if_desc = intf->altsetting;
 978
 979         /* check interface endpoint addresses */
 980         for (i = 0; i < if_desc->desc.bNumEndpoints; i++) {
 981                 struct usb_endpoint_descriptor *ep = &if_desc->endpoint[i].desc;
 982
 983                 /*
 984                  * below is the list of valid ep addreses. Any other ep address
 985                  * is considered as not-CAN interface address => no dev created
 986                  */
 987                 switch (ep->bEndpointAddress) {
 988                 case PCAN_USBPRO_EP_CMDOUT:
 989                 case PCAN_USBPRO_EP_CMDIN:
 990                 case PCAN_USBPRO_EP_MSGOUT_0:
 991                 case PCAN_USBPRO_EP_MSGOUT_1:
 992                 case PCAN_USBPRO_EP_MSGIN:
 993                 case PCAN_USBPRO_EP_UNUSED:
 994                         break;
 995                 default:
 996                         return -ENODEV;
 997                 }
 998         }
 999
1000         return 0;
1001 }
1002
1003 /*
1004  * describe the PCAN-USB Pro adapter
1005  */
1006 static const struct can_bittiming_const pcan_usb_pro_const = {
1007         .name = "pcan_usb_pro",
1008         .tseg1_min = 1,
1009         .tseg1_max = 16,
1010         .tseg2_min = 1,
1011         .tseg2_max = 8,
1012         .sjw_max = 4,
1013         .brp_min = 1,
1014         .brp_max = 1024,
1015         .brp_inc = 1,
1016 };
1017
1018 const struct peak_usb_adapter pcan_usb_pro = {
1019         .name = "PCAN-USB Pro",
1020         .device_id = PCAN_USBPRO_PRODUCT_ID,
1021         .ctrl_count = PCAN_USBPRO_CHANNEL_COUNT,
1022         .ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
1023         .clock = {
1024                 .freq = PCAN_USBPRO_CRYSTAL_HZ,
1025         },
1026         .bittiming_const = &pcan_usb_pro_const,
1027
1028         /* size of device private data */
1029         .sizeof_dev_private = sizeof(struct pcan_usb_pro_device),
1030
1031         /* timestamps usage */
1032         .ts_used_bits = 32,
1033         .ts_period = 1000000, /* calibration period in ts. */
1034         .us_per_ts_scale = 1, /* us = (ts * scale) >> shift */
1035         .us_per_ts_shift = 0,
1036
1037         /* give here messages in/out endpoints */
1038         .ep_msg_in = PCAN_USBPRO_EP_MSGIN,
1039         .ep_msg_out = {PCAN_USBPRO_EP_MSGOUT_0, PCAN_USBPRO_EP_MSGOUT_1},
1040
1041         /* size of rx/tx usb buffers */
1042         .rx_buffer_size = PCAN_USBPRO_RX_BUFFER_SIZE,
1043         .tx_buffer_size = PCAN_USBPRO_TX_BUFFER_SIZE,
1044
1045         /* device callbacks */
1046         .intf_probe = pcan_usb_pro_probe,
1047         .dev_init = pcan_usb_pro_init,
1048         .dev_exit = pcan_usb_pro_exit,
1049         .dev_free = pcan_usb_pro_free,
1050         .dev_set_bus = pcan_usb_pro_set_bus,
1051         .dev_set_bittiming = pcan_usb_pro_set_bittiming,
1052         .dev_get_device_id = pcan_usb_pro_get_device_id,
1053         .dev_decode_buf = pcan_usb_pro_decode_buf,
1054         .dev_encode_msg = pcan_usb_pro_encode_msg,
1055         .dev_start = pcan_usb_pro_start,
1056         .dev_stop = pcan_usb_pro_stop,
1057         .dev_restart_async = pcan_usb_pro_restart_async,
1058 };