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 /* PCAN-USB Pro Endpoints */
  31 #define PCAN_USBPRO_EP_CMDOUT           1
  32 #define PCAN_USBPRO_EP_CMDIN            (PCAN_USBPRO_EP_CMDOUT | USB_DIR_IN)
  33 #define PCAN_USBPRO_EP_MSGOUT_0         2
  34 #define PCAN_USBPRO_EP_MSGIN            (PCAN_USBPRO_EP_MSGOUT_0 | USB_DIR_IN)
  35 #define PCAN_USBPRO_EP_MSGOUT_1         3
  36 #define PCAN_USBPRO_EP_UNUSED           (PCAN_USBPRO_EP_MSGOUT_1 | USB_DIR_IN)
  37
  38 #define PCAN_USBPRO_CHANNEL_COUNT       2
  39
  40 /* PCAN-USB Pro adapter internal clock (MHz) */
  41 #define PCAN_USBPRO_CRYSTAL_HZ          56000000
  42
  43 /* PCAN-USB Pro command timeout (ms.) */
  44 #define PCAN_USBPRO_COMMAND_TIMEOUT     1000
  45
  46 /* PCAN-USB Pro rx/tx buffers size */
  47 #define PCAN_USBPRO_RX_BUFFER_SIZE      1024
  48 #define PCAN_USBPRO_TX_BUFFER_SIZE      64
  49
  50 #define PCAN_USBPRO_MSG_HEADER_LEN      4
  51
  52 /* some commands responses need to be re-submitted */
  53 #define PCAN_USBPRO_RSP_SUBMIT_MAX      2
  54
  55 #define PCAN_USBPRO_RTR                 0x01
  56 #define PCAN_USBPRO_EXT                 0x02
  57
  58 #define PCAN_USBPRO_CMD_BUFFER_SIZE     512
  59
  60 /* handle device specific info used by the netdevices */
  61 struct pcan_usb_pro_interface {
  62         struct peak_usb_device *dev[PCAN_USBPRO_CHANNEL_COUNT];
  63         struct peak_time_ref time_ref;
  64         int cm_ignore_count;
  65         int dev_opened_count;
  66 };
  67
  68 /* device information */
  69 struct pcan_usb_pro_device {
  70         struct peak_usb_device dev;
  71         struct pcan_usb_pro_interface *usb_if;
  72         u32 cached_ccbt;
  73 };
  74
  75 /* internal structure used to handle messages sent to bulk urb */
  76 struct pcan_usb_pro_msg {
  77         u8 *rec_ptr;
  78         int rec_buffer_size;
  79         int rec_buffer_len;
  80         union {
  81                 u16 *rec_cnt_rd;
  82                 u32 *rec_cnt;
  83                 u8 *rec_buffer;
  84         } u;
  85 };
  86
  87 /* records sizes table indexed on message id. (8-bits value) */
  88 static u16 pcan_usb_pro_sizeof_rec[256] = {
  89         [PCAN_USBPRO_SETBTR] = sizeof(struct pcan_usb_pro_btr),
  90         [PCAN_USBPRO_SETBUSACT] = sizeof(struct pcan_usb_pro_busact),
  91         [PCAN_USBPRO_SETSILENT] = sizeof(struct pcan_usb_pro_silent),
  92         [PCAN_USBPRO_SETFILTR] = sizeof(struct pcan_usb_pro_filter),
  93         [PCAN_USBPRO_SETTS] = sizeof(struct pcan_usb_pro_setts),
  94         [PCAN_USBPRO_GETDEVID] = sizeof(struct pcan_usb_pro_devid),
  95         [PCAN_USBPRO_SETLED] = sizeof(struct pcan_usb_pro_setled),
  96         [PCAN_USBPRO_RXMSG8] = sizeof(struct pcan_usb_pro_rxmsg),
  97         [PCAN_USBPRO_RXMSG4] = sizeof(struct pcan_usb_pro_rxmsg) - 4,
  98         [PCAN_USBPRO_RXMSG0] = sizeof(struct pcan_usb_pro_rxmsg) - 8,
  99         [PCAN_USBPRO_RXRTR] = sizeof(struct pcan_usb_pro_rxmsg) - 8,
 100         [PCAN_USBPRO_RXSTATUS] = sizeof(struct pcan_usb_pro_rxstatus),
 101         [PCAN_USBPRO_RXTS] = sizeof(struct pcan_usb_pro_rxts),
 102         [PCAN_USBPRO_TXMSG8] = sizeof(struct pcan_usb_pro_txmsg),
 103         [PCAN_USBPRO_TXMSG4] = sizeof(struct pcan_usb_pro_txmsg) - 4,
 104         [PCAN_USBPRO_TXMSG0] = sizeof(struct pcan_usb_pro_txmsg) - 8,
 105 };
 106
 107 /*
 108  * initialize PCAN-USB Pro message data structure
 109  */
 110 static u8 *pcan_msg_init(struct pcan_usb_pro_msg *pm, void *buffer_addr,
 111                          int buffer_size)
 112 {
 113         if (buffer_size < PCAN_USBPRO_MSG_HEADER_LEN)
 114                 return NULL;
 115
 116         pm->u.rec_buffer = (u8 *)buffer_addr;
 117         pm->rec_buffer_size = pm->rec_buffer_len = buffer_size;
 118         pm->rec_ptr = pm->u.rec_buffer + PCAN_USBPRO_MSG_HEADER_LEN;
 119
 120         return pm->rec_ptr;
 121 }
 122
 123 static u8 *pcan_msg_init_empty(struct pcan_usb_pro_msg *pm,
 124                                void *buffer_addr, int buffer_size)
 125 {
 126         u8 *pr = pcan_msg_init(pm, buffer_addr, buffer_size);
 127
 128         if (pr) {
 129                 pm->rec_buffer_len = PCAN_USBPRO_MSG_HEADER_LEN;
 130                 *pm->u.rec_cnt = 0;
 131         }
 132         return pr;
 133 }
 134
 135 /*
 136  * add one record to a message being built
 137  */
 138 static int pcan_msg_add_rec(struct pcan_usb_pro_msg *pm, u8 id, ...)
 139 {
 140         int len, i;
 141         u8 *pc;
 142         va_list ap;
 143
 144         va_start(ap, id);
 145
 146         pc = pm->rec_ptr + 1;
 147
 148         i = 0;
 149         switch (id) {
 150         case PCAN_USBPRO_TXMSG8:
 151                 i += 4;
 152         case PCAN_USBPRO_TXMSG4:
 153                 i += 4;
 154         case PCAN_USBPRO_TXMSG0:
 155                 *pc++ = va_arg(ap, int);
 156                 *pc++ = va_arg(ap, int);
 157                 *pc++ = va_arg(ap, int);
 158                 *(u32 *)pc = cpu_to_le32(va_arg(ap, u32));
 159                 pc += 4;
 160                 memcpy(pc, va_arg(ap, int *), i);
 161                 pc += i;
 162                 break;
 163
 164         case PCAN_USBPRO_SETBTR:
 165         case PCAN_USBPRO_GETDEVID:
 166                 *pc++ = va_arg(ap, int);
 167                 pc += 2;
 168                 *(u32 *)pc = cpu_to_le32(va_arg(ap, u32));
 169                 pc += 4;
 170                 break;
 171
 172         case PCAN_USBPRO_SETFILTR:
 173         case PCAN_USBPRO_SETBUSACT:
 174         case PCAN_USBPRO_SETSILENT:
 175                 *pc++ = va_arg(ap, int);
 176                 *(u16 *)pc = cpu_to_le16(va_arg(ap, int));
 177                 pc += 2;
 178                 break;
 179
 180         case PCAN_USBPRO_SETLED:
 181                 *pc++ = va_arg(ap, int);
 182                 *(u16 *)pc = cpu_to_le16(va_arg(ap, int));
 183                 pc += 2;
 184                 *(u32 *)pc = cpu_to_le32(va_arg(ap, u32));
 185                 pc += 4;
 186                 break;
 187
 188         case PCAN_USBPRO_SETTS:
 189                 pc++;
 190                 *(u16 *)pc = cpu_to_le16(va_arg(ap, int));
 191                 pc += 2;
 192                 break;
 193
 194         default:
 195                 pr_err("%s: %s(): unknown data type %02Xh (%d)\n",
 196                         PCAN_USB_DRIVER_NAME, __func__, id, id);
 197                 pc--;
 198                 break;
 199         }
 200
 201         len = pc - pm->rec_ptr;
 202         if (len > 0) {
 203                 *pm->u.rec_cnt = cpu_to_le32(*pm->u.rec_cnt+1);
 204                 *pm->rec_ptr = id;
 205
 206                 pm->rec_ptr = pc;
 207                 pm->rec_buffer_len += len;
 208         }
 209
 210         va_end(ap);
 211
 212         return len;
 213 }
 214
 215 /*
 216  * send PCAN-USB Pro command synchronously
 217  */
 218 static int pcan_usb_pro_send_cmd(struct peak_usb_device *dev,
 219                                  struct pcan_usb_pro_msg *pum)
 220 {
 221         int actual_length;
 222         int err;
 223
 224         /* usb device unregistered? */
 225         if (!(dev->state & PCAN_USB_STATE_CONNECTED))
 226                 return 0;
 227
 228         err = usb_bulk_msg(dev->udev,
 229                 usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT),
 230                 pum->u.rec_buffer, pum->rec_buffer_len,
 231                 &actual_length, PCAN_USBPRO_COMMAND_TIMEOUT);
 232         if (err)
 233                 netdev_err(dev->netdev, "sending command failure: %d\n", err);
 234
 235         return err;
 236 }
 237
 238 /*
 239  * wait for PCAN-USB Pro command response
 240  */
 241 static int pcan_usb_pro_wait_rsp(struct peak_usb_device *dev,
 242                                  struct pcan_usb_pro_msg *pum)
 243 {
 244         u8 req_data_type, req_channel;
 245         int actual_length;
 246         int i, err = 0;
 247
 248         /* usb device unregistered? */
 249         if (!(dev->state & PCAN_USB_STATE_CONNECTED))
 250                 return 0;
 251
 252         req_data_type = pum->u.rec_buffer[4];
 253         req_channel = pum->u.rec_buffer[5];
 254
 255         *pum->u.rec_cnt = 0;
 256         for (i = 0; !err && i < PCAN_USBPRO_RSP_SUBMIT_MAX; i++) {
 257                 struct pcan_usb_pro_msg rsp;
 258                 union pcan_usb_pro_rec *pr;
 259                 u32 r, rec_cnt;
 260                 u16 rec_len;
 261                 u8 *pc;
 262
 263                 err = usb_bulk_msg(dev->udev,
 264                         usb_rcvbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDIN),
 265                         pum->u.rec_buffer, pum->rec_buffer_len,
 266                         &actual_length, PCAN_USBPRO_COMMAND_TIMEOUT);
 267                 if (err) {
 268                         netdev_err(dev->netdev, "waiting rsp error %d\n", err);
 269                         break;
 270                 }
 271
 272                 if (actual_length == 0)
 273                         continue;
 274
 275                 err = -EBADMSG;
 276                 if (actual_length < PCAN_USBPRO_MSG_HEADER_LEN) {
 277                         netdev_err(dev->netdev,
 278                                    "got abnormal too small rsp (len=%d)\n",
 279                                    actual_length);
 280                         break;
 281                 }
 282
 283                 pc = pcan_msg_init(&rsp, pum->u.rec_buffer,
 284                         actual_length);
 285
 286                 rec_cnt = le32_to_cpu(*rsp.u.rec_cnt);
 287
 288                 /* loop on records stored into message */
 289                 for (r = 0; r < rec_cnt; r++) {
 290                         pr = (union pcan_usb_pro_rec *)pc;
 291                         rec_len = pcan_usb_pro_sizeof_rec[pr->data_type];
 292                         if (!rec_len) {
 293                                 netdev_err(dev->netdev,
 294                                            "got unprocessed record in msg\n");
 295                                 pcan_dump_mem("rcvd rsp msg", pum->u.rec_buffer,
 296                                               actual_length);
 297                                 break;
 298                         }
 299
 300                         /* check if response corresponds to request */
 301                         if (pr->data_type != req_data_type)
 302                                 netdev_err(dev->netdev,
 303                                            "got unwanted rsp %xh: ignored\n",
 304                                            pr->data_type);
 305
 306                         /* check if channel in response corresponds too */
 307                         else if ((req_channel != 0xff) && \
 308                                 (pr->bus_act.channel != req_channel))
 309                                 netdev_err(dev->netdev,
 310                                         "got rsp %xh but on chan%u: ignored\n",
 311                                         req_data_type, pr->bus_act.channel);
 312
 313                         /* got the response */
 314                         else
 315                                 return 0;
 316
 317                         /* otherwise, go on with next record in message */
 318                         pc += rec_len;
 319                 }
 320         }
 321
 322         return (i >= PCAN_USBPRO_RSP_SUBMIT_MAX) ? -ERANGE : err;
 323 }
 324
 325 static int pcan_usb_pro_send_req(struct peak_usb_device *dev, int req_id,
 326                                  int req_value, void *req_addr, int req_size)
 327 {
 328         int err;
 329         u8 req_type;
 330         unsigned int p;
 331
 332         /* usb device unregistered? */
 333         if (!(dev->state & PCAN_USB_STATE_CONNECTED))
 334                 return 0;
 335
 336         memset(req_addr, '\0', req_size);
 337
 338         req_type = USB_TYPE_VENDOR | USB_RECIP_OTHER;
 339
 340         switch (req_id) {
 341         case PCAN_USBPRO_REQ_FCT:
 342                 p = usb_sndctrlpipe(dev->udev, 0);
 343                 break;
 344
 345         default:
 346                 p = usb_rcvctrlpipe(dev->udev, 0);
 347                 req_type |= USB_DIR_IN;
 348                 break;
 349         }
 350
 351         err = usb_control_msg(dev->udev, p, req_id, req_type, req_value, 0,
 352                               req_addr, req_size, 2 * USB_CTRL_GET_TIMEOUT);
 353         if (err < 0) {
 354                 netdev_info(dev->netdev,
 355                             "unable to request usb[type=%d value=%d] err=%d\n",
 356                             req_id, req_value, err);
 357                 return err;
 358         }
 359
 360         return 0;
 361 }
 362
 363 static int pcan_usb_pro_set_ts(struct peak_usb_device *dev, u16 onoff)
 364 {
 365         struct pcan_usb_pro_msg um;
 366
 367         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 368         pcan_msg_add_rec(&um, PCAN_USBPRO_SETTS, onoff);
 369
 370         return pcan_usb_pro_send_cmd(dev, &um);
 371 }
 372
 373 static int pcan_usb_pro_set_bitrate(struct peak_usb_device *dev, u32 ccbt)
 374 {
 375         struct pcan_usb_pro_device *pdev =
 376                         container_of(dev, struct pcan_usb_pro_device, dev);
 377         struct pcan_usb_pro_msg um;
 378
 379         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 380         pcan_msg_add_rec(&um, PCAN_USBPRO_SETBTR, dev->ctrl_idx, ccbt);
 381
 382         /* cache the CCBT value to reuse it before next buson */
 383         pdev->cached_ccbt = ccbt;
 384
 385         return pcan_usb_pro_send_cmd(dev, &um);
 386 }
 387
 388 static int pcan_usb_pro_set_bus(struct peak_usb_device *dev, u8 onoff)
 389 {
 390         struct pcan_usb_pro_msg um;
 391
 392         /* if bus=on, be sure the bitrate being set before! */
 393         if (onoff) {
 394                 struct pcan_usb_pro_device *pdev =
 395                              container_of(dev, struct pcan_usb_pro_device, dev);
 396
 397                 pcan_usb_pro_set_bitrate(dev, pdev->cached_ccbt);
 398         }
 399
 400         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 401         pcan_msg_add_rec(&um, PCAN_USBPRO_SETBUSACT, dev->ctrl_idx, onoff);
 402
 403         return pcan_usb_pro_send_cmd(dev, &um);
 404 }
 405
 406 static int pcan_usb_pro_set_silent(struct peak_usb_device *dev, u8 onoff)
 407 {
 408         struct pcan_usb_pro_msg um;
 409
 410         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 411         pcan_msg_add_rec(&um, PCAN_USBPRO_SETSILENT, dev->ctrl_idx, onoff);
 412
 413         return pcan_usb_pro_send_cmd(dev, &um);
 414 }
 415
 416 static int pcan_usb_pro_set_filter(struct peak_usb_device *dev, u16 filter_mode)
 417 {
 418         struct pcan_usb_pro_msg um;
 419
 420         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 421         pcan_msg_add_rec(&um, PCAN_USBPRO_SETFILTR, dev->ctrl_idx, filter_mode);
 422
 423         return pcan_usb_pro_send_cmd(dev, &um);
 424 }
 425
 426 static int pcan_usb_pro_set_led(struct peak_usb_device *dev, u8 mode,
 427                                 u32 timeout)
 428 {
 429         struct pcan_usb_pro_msg um;
 430
 431         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 432         pcan_msg_add_rec(&um, PCAN_USBPRO_SETLED, dev->ctrl_idx, mode, timeout);
 433
 434         return pcan_usb_pro_send_cmd(dev, &um);
 435 }
 436
 437 static int pcan_usb_pro_get_device_id(struct peak_usb_device *dev,
 438                                       u32 *device_id)
 439 {
 440         struct pcan_usb_pro_devid *pdn;
 441         struct pcan_usb_pro_msg um;
 442         int err;
 443         u8 *pc;
 444
 445         pc = pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 446         pcan_msg_add_rec(&um, PCAN_USBPRO_GETDEVID, dev->ctrl_idx);
 447
 448         err =  pcan_usb_pro_send_cmd(dev, &um);
 449         if (err)
 450                 return err;
 451
 452         err = pcan_usb_pro_wait_rsp(dev, &um);
 453         if (err)
 454                 return err;
 455
 456         pdn = (struct pcan_usb_pro_devid *)pc;
 457         if (device_id)
 458                 *device_id = le32_to_cpu(pdn->serial_num);
 459
 460         return err;
 461 }
 462
 463 static int pcan_usb_pro_set_bittiming(struct peak_usb_device *dev,
 464                                       struct can_bittiming *bt)
 465 {
 466         u32 ccbt;
 467
 468         ccbt = (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) ? 0x00800000 : 0;
 469         ccbt |= (bt->sjw - 1) << 24;
 470         ccbt |= (bt->phase_seg2 - 1) << 20;
 471         ccbt |= (bt->prop_seg + bt->phase_seg1 - 1) << 16; /* = tseg1 */
 472         ccbt |= bt->brp - 1;
 473
 474         netdev_info(dev->netdev, "setting ccbt=0x%08x\n", ccbt);
 475
 476         return pcan_usb_pro_set_bitrate(dev, ccbt);
 477 }
 478
 479 static void pcan_usb_pro_restart_complete(struct urb *urb)
 480 {
 481         /* can delete usb resources */
 482         peak_usb_async_complete(urb);
 483
 484         /* notify candev and netdev */
 485         peak_usb_restart_complete(urb->context);
 486 }
 487
 488 /*
 489  * handle restart but in asynchronously way
 490  */
 491 static int pcan_usb_pro_restart_async(struct peak_usb_device *dev,
 492                                       struct urb *urb, u8 *buf)
 493 {
 494         struct pcan_usb_pro_msg um;
 495
 496         pcan_msg_init_empty(&um, buf, PCAN_USB_MAX_CMD_LEN);
 497         pcan_msg_add_rec(&um, PCAN_USBPRO_SETBUSACT, dev->ctrl_idx, 1);
 498
 499         usb_fill_bulk_urb(urb, dev->udev,
 500                         usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT),
 501                         buf, PCAN_USB_MAX_CMD_LEN,
 502                         pcan_usb_pro_restart_complete, dev);
 503
 504         return usb_submit_urb(urb, GFP_ATOMIC);
 505 }
 506
 507 static void pcan_usb_pro_drv_loaded(struct peak_usb_device *dev, int loaded)
 508 {
 509         u8 buffer[16];
 510
 511         buffer[0] = 0;
 512         buffer[1] = !!loaded;
 513
 514         pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_FCT,
 515                               PCAN_USBPRO_FCT_DRVLD, buffer, sizeof(buffer));
 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         netif_rx(skb);
 557         netdev->stats.rx_packets++;
 558         netdev->stats.rx_bytes += can_frame->can_dlc;
 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 u32 raw_status = le32_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                 can_bus_off(netdev);
 630                 break;
 631
 632         case CAN_STATE_ERROR_PASSIVE:
 633                 can_frame->can_id |= CAN_ERR_CRTL;
 634                 can_frame->data[1] |= err_mask;
 635                 dev->can.can_stats.error_passive++;
 636                 break;
 637
 638         case CAN_STATE_ERROR_WARNING:
 639                 can_frame->can_id |= CAN_ERR_CRTL;
 640                 can_frame->data[1] |= err_mask;
 641                 dev->can.can_stats.error_warning++;
 642                 break;
 643
 644         case CAN_STATE_ERROR_ACTIVE:
 645                 break;
 646
 647         default:
 648                 /* CAN_STATE_MAX (trick to handle other errors) */
 649                 if (raw_status & PCAN_USBPRO_STATUS_OVERRUN) {
 650                         can_frame->can_id |= CAN_ERR_PROT;
 651                         can_frame->data[2] |= CAN_ERR_PROT_OVERLOAD;
 652                         netdev->stats.rx_over_errors++;
 653                         netdev->stats.rx_errors++;
 654                 }
 655
 656                 if (raw_status & PCAN_USBPRO_STATUS_QOVERRUN) {
 657                         can_frame->can_id |= CAN_ERR_CRTL;
 658                         can_frame->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
 659                         netdev->stats.rx_over_errors++;
 660                         netdev->stats.rx_errors++;
 661                 }
 662
 663                 new_state = CAN_STATE_ERROR_ACTIVE;
 664                 break;
 665         }
 666
 667         dev->can.state = new_state;
 668
 669         peak_usb_get_ts_tv(&usb_if->time_ref, le32_to_cpu(er->ts32), &tv);
 670         hwts = skb_hwtstamps(skb);
 671         hwts->hwtstamp = timeval_to_ktime(tv);
 672         netif_rx(skb);
 673         netdev->stats.rx_packets++;
 674         netdev->stats.rx_bytes += can_frame->can_dlc;
 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_interface *usb_if;
 855         struct pcan_usb_pro_device *pdev =
 856                         container_of(dev, struct pcan_usb_pro_device, dev);
 857
 858         /* do this for 1st channel only */
 859         if (!dev->prev_siblings) {
 860                 struct pcan_usb_pro_fwinfo fi;
 861                 struct pcan_usb_pro_blinfo bi;
 862                 int err;
 863
 864                 /* allocate netdevices common structure attached to first one */
 865                 usb_if = kzalloc(sizeof(struct pcan_usb_pro_interface),
 866                                  GFP_KERNEL);
 867                 if (!usb_if)
 868                         return -ENOMEM;
 869
 870                 /* number of ts msgs to ignore before taking one into account */
 871                 usb_if->cm_ignore_count = 5;
 872
 873                 /*
 874                  * explicit use of dev_xxx() instead of netdev_xxx() here:
 875                  * information displayed are related to the device itself, not
 876                  * to the canx netdevices.
 877                  */
 878                 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
 879                                             PCAN_USBPRO_INFO_FW,
 880                                             &fi, sizeof(fi));
 881                 if (err) {
 882                         kfree(usb_if);
 883                         dev_err(dev->netdev->dev.parent,
 884                                 "unable to read %s firmware info (err %d)\n",
 885                                 pcan_usb_pro.name, err);
 886                         return err;
 887                 }
 888
 889                 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
 890                                             PCAN_USBPRO_INFO_BL,
 891                                             &bi, sizeof(bi));
 892                 if (err) {
 893                         kfree(usb_if);
 894                         dev_err(dev->netdev->dev.parent,
 895                                 "unable to read %s bootloader info (err %d)\n",
 896                                 pcan_usb_pro.name, err);
 897                         return err;
 898                 }
 899
 900                 dev_info(dev->netdev->dev.parent,
 901                      "PEAK-System %s hwrev %u serial %08X.%08X (%u channels)\n",
 902                      pcan_usb_pro.name,
 903                      bi.hw_rev, bi.serial_num_hi, bi.serial_num_lo,
 904                      pcan_usb_pro.ctrl_count);
 905
 906                 /* tell the device the can driver is running */
 907                 pcan_usb_pro_drv_loaded(dev, 1);
 908         } else {
 909                 usb_if = pcan_usb_pro_dev_if(dev->prev_siblings);
 910         }
 911
 912         pdev->usb_if = usb_if;
 913         usb_if->dev[dev->ctrl_idx] = dev;
 914
 915         /* set LED in default state (end of init phase) */
 916         pcan_usb_pro_set_led(dev, 0, 1);
 917
 918         return 0;
 919 }
 920
 921 static void pcan_usb_pro_exit(struct peak_usb_device *dev)
 922 {
 923         struct pcan_usb_pro_device *pdev =
 924                         container_of(dev, struct pcan_usb_pro_device, dev);
 925
 926         /*
 927          * when rmmod called before unplug and if down, should reset things
 928          * before leaving
 929          */
 930         if (dev->can.state != CAN_STATE_STOPPED) {
 931                 /* set bus off on the corresponding channel */
 932                 pcan_usb_pro_set_bus(dev, 0);
 933         }
 934
 935         /* if channel #0 (only) */
 936         if (dev->ctrl_idx == 0) {
 937                 /* turn off calibration message if any device were opened */
 938                 if (pdev->usb_if->dev_opened_count > 0)
 939                         pcan_usb_pro_set_ts(dev, 0);
 940
 941                 /* tell the PCAN-USB Pro device the driver is being unloaded */
 942                 pcan_usb_pro_drv_loaded(dev, 0);
 943         }
 944 }
 945
 946 /*
 947  * called when PCAN-USB Pro adapter is unplugged
 948  */
 949 static void pcan_usb_pro_free(struct peak_usb_device *dev)
 950 {
 951         /* last device: can free pcan_usb_pro_interface object now */
 952         if (!dev->prev_siblings && !dev->next_siblings)
 953                 kfree(pcan_usb_pro_dev_if(dev));
 954 }
 955
 956 /*
 957  * probe function for new PCAN-USB Pro usb interface
 958  */
 959 static int pcan_usb_pro_probe(struct usb_interface *intf)
 960 {
 961         struct usb_host_interface *if_desc;
 962         int i;
 963
 964         if_desc = intf->altsetting;
 965
 966         /* check interface endpoint addresses */
 967         for (i = 0; i < if_desc->desc.bNumEndpoints; i++) {
 968                 struct usb_endpoint_descriptor *ep = &if_desc->endpoint[i].desc;
 969
 970                 /*
 971                  * below is the list of valid ep addreses. Any other ep address
 972                  * is considered as not-CAN interface address => no dev created
 973                  */
 974                 switch (ep->bEndpointAddress) {
 975                 case PCAN_USBPRO_EP_CMDOUT:
 976                 case PCAN_USBPRO_EP_CMDIN:
 977                 case PCAN_USBPRO_EP_MSGOUT_0:
 978                 case PCAN_USBPRO_EP_MSGOUT_1:
 979                 case PCAN_USBPRO_EP_MSGIN:
 980                 case PCAN_USBPRO_EP_UNUSED:
 981                         break;
 982                 default:
 983                         return -ENODEV;
 984                 }
 985         }
 986
 987         return 0;
 988 }
 989
 990 /*
 991  * describe the PCAN-USB Pro adapter
 992  */
 993 struct peak_usb_adapter pcan_usb_pro = {
 994         .name = "PCAN-USB Pro",
 995         .device_id = PCAN_USBPRO_PRODUCT_ID,
 996         .ctrl_count = PCAN_USBPRO_CHANNEL_COUNT,
 997         .clock = {
 998                 .freq = PCAN_USBPRO_CRYSTAL_HZ,
 999         },
1000         .bittiming_const = {
1001                 .name = "pcan_usb_pro",
1002                 .tseg1_min = 1,
1003                 .tseg1_max = 16,
1004                 .tseg2_min = 1,
1005                 .tseg2_max = 8,
1006                 .sjw_max = 4,
1007                 .brp_min = 1,
1008                 .brp_max = 1024,
1009                 .brp_inc = 1,
1010         },
1011
1012         /* size of device private data */
1013         .sizeof_dev_private = sizeof(struct pcan_usb_pro_device),
1014
1015         /* timestamps usage */
1016         .ts_used_bits = 32,
1017         .ts_period = 1000000, /* calibration period in ts. */
1018         .us_per_ts_scale = 1, /* us = (ts * scale) >> shift */
1019         .us_per_ts_shift = 0,
1020
1021         /* give here messages in/out endpoints */
1022         .ep_msg_in = PCAN_USBPRO_EP_MSGIN,
1023         .ep_msg_out = {PCAN_USBPRO_EP_MSGOUT_0, PCAN_USBPRO_EP_MSGOUT_1},
1024
1025         /* size of rx/tx usb buffers */
1026         .rx_buffer_size = PCAN_USBPRO_RX_BUFFER_SIZE,
1027         .tx_buffer_size = PCAN_USBPRO_TX_BUFFER_SIZE,
1028
1029         /* device callbacks */
1030         .intf_probe = pcan_usb_pro_probe,
1031         .dev_init = pcan_usb_pro_init,
1032         .dev_exit = pcan_usb_pro_exit,
1033         .dev_free = pcan_usb_pro_free,
1034         .dev_set_bus = pcan_usb_pro_set_bus,
1035         .dev_set_bittiming = pcan_usb_pro_set_bittiming,
1036         .dev_get_device_id = pcan_usb_pro_get_device_id,
1037         .dev_decode_buf = pcan_usb_pro_decode_buf,
1038         .dev_encode_msg = pcan_usb_pro_encode_msg,
1039         .dev_start = pcan_usb_pro_start,
1040         .dev_stop = pcan_usb_pro_stop,
1041         .dev_restart_async = pcan_usb_pro_restart_async,
1042 };