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                                 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
 536         skb = alloc_can_skb(netdev, &can_frame);
 537         if (!skb)
 538                 return -ENOMEM;
 539
 540         can_frame->can_id = le32_to_cpu(rx->id);
 541         can_frame->can_dlc = rx->len & 0x0f;
 542
 543         if (rx->flags & PCAN_USBPRO_EXT)
 544                 can_frame->can_id |= CAN_EFF_FLAG;
 545
 546         if (rx->flags & PCAN_USBPRO_RTR)
 547                 can_frame->can_id |= CAN_RTR_FLAG;
 548         else
 549                 memcpy(can_frame->data, rx->data, can_frame->can_dlc);
 550
 551         peak_usb_get_ts_tv(&usb_if->time_ref, le32_to_cpu(rx->ts32), &tv);
 552         skb->tstamp = timeval_to_ktime(tv);
 553
 554         netif_rx(skb);
 555         netdev->stats.rx_packets++;
 556         netdev->stats.rx_bytes += can_frame->can_dlc;
 557
 558         return 0;
 559 }
 560
 561 static int pcan_usb_pro_handle_error(struct pcan_usb_pro_interface *usb_if,
 562                                      struct pcan_usb_pro_rxstatus *er)
 563 {
 564         const u32 raw_status = le32_to_cpu(er->status);
 565         const unsigned int ctrl_idx = (er->channel >> 4) & 0x0f;
 566         struct peak_usb_device *dev = usb_if->dev[ctrl_idx];
 567         struct net_device *netdev = dev->netdev;
 568         struct can_frame *can_frame;
 569         enum can_state new_state = CAN_STATE_ERROR_ACTIVE;
 570         u8 err_mask = 0;
 571         struct sk_buff *skb;
 572         struct timeval tv;
 573
 574         /* nothing should be sent while in BUS_OFF state */
 575         if (dev->can.state == CAN_STATE_BUS_OFF)
 576                 return 0;
 577
 578         if (!raw_status) {
 579                 /* no error bit (back to active state) */
 580                 dev->can.state = CAN_STATE_ERROR_ACTIVE;
 581                 return 0;
 582         }
 583
 584         if (raw_status & (PCAN_USBPRO_STATUS_OVERRUN |
 585                           PCAN_USBPRO_STATUS_QOVERRUN)) {
 586                 /* trick to bypass next comparison and process other errors */
 587                 new_state = CAN_STATE_MAX;
 588         }
 589
 590         if (raw_status & PCAN_USBPRO_STATUS_BUS) {
 591                 new_state = CAN_STATE_BUS_OFF;
 592         } else if (raw_status & PCAN_USBPRO_STATUS_ERROR) {
 593                 u32 rx_err_cnt = (le32_to_cpu(er->err_frm) & 0x00ff0000) >> 16;
 594                 u32 tx_err_cnt = (le32_to_cpu(er->err_frm) & 0xff000000) >> 24;
 595
 596                 if (rx_err_cnt > 127)
 597                         err_mask |= CAN_ERR_CRTL_RX_PASSIVE;
 598                 else if (rx_err_cnt > 96)
 599                         err_mask |= CAN_ERR_CRTL_RX_WARNING;
 600
 601                 if (tx_err_cnt > 127)
 602                         err_mask |= CAN_ERR_CRTL_TX_PASSIVE;
 603                 else if (tx_err_cnt > 96)
 604                         err_mask |= CAN_ERR_CRTL_TX_WARNING;
 605
 606                 if (err_mask & (CAN_ERR_CRTL_RX_WARNING |
 607                                 CAN_ERR_CRTL_TX_WARNING))
 608                         new_state = CAN_STATE_ERROR_WARNING;
 609                 else if (err_mask & (CAN_ERR_CRTL_RX_PASSIVE |
 610                                      CAN_ERR_CRTL_TX_PASSIVE))
 611                         new_state = CAN_STATE_ERROR_PASSIVE;
 612         }
 613
 614         /* donot post any error if current state didn't change */
 615         if (dev->can.state == new_state)
 616                 return 0;
 617
 618         /* allocate an skb to store the error frame */
 619         skb = alloc_can_err_skb(netdev, &can_frame);
 620         if (!skb)
 621                 return -ENOMEM;
 622
 623         switch (new_state) {
 624         case CAN_STATE_BUS_OFF:
 625                 can_frame->can_id |= CAN_ERR_BUSOFF;
 626                 can_bus_off(netdev);
 627                 break;
 628
 629         case CAN_STATE_ERROR_PASSIVE:
 630                 can_frame->can_id |= CAN_ERR_CRTL;
 631                 can_frame->data[1] |= err_mask;
 632                 dev->can.can_stats.error_passive++;
 633                 break;
 634
 635         case CAN_STATE_ERROR_WARNING:
 636                 can_frame->can_id |= CAN_ERR_CRTL;
 637                 can_frame->data[1] |= err_mask;
 638                 dev->can.can_stats.error_warning++;
 639                 break;
 640
 641         case CAN_STATE_ERROR_ACTIVE:
 642                 break;
 643
 644         default:
 645                 /* CAN_STATE_MAX (trick to handle other errors) */
 646                 if (raw_status & PCAN_USBPRO_STATUS_OVERRUN) {
 647                         can_frame->can_id |= CAN_ERR_PROT;
 648                         can_frame->data[2] |= CAN_ERR_PROT_OVERLOAD;
 649                         netdev->stats.rx_over_errors++;
 650                         netdev->stats.rx_errors++;
 651                 }
 652
 653                 if (raw_status & PCAN_USBPRO_STATUS_QOVERRUN) {
 654                         can_frame->can_id |= CAN_ERR_CRTL;
 655                         can_frame->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
 656                         netdev->stats.rx_over_errors++;
 657                         netdev->stats.rx_errors++;
 658                 }
 659
 660                 new_state = CAN_STATE_ERROR_ACTIVE;
 661                 break;
 662         }
 663
 664         dev->can.state = new_state;
 665
 666         peak_usb_get_ts_tv(&usb_if->time_ref, le32_to_cpu(er->ts32), &tv);
 667         skb->tstamp = timeval_to_ktime(tv);
 668         netif_rx(skb);
 669         netdev->stats.rx_packets++;
 670         netdev->stats.rx_bytes += can_frame->can_dlc;
 671
 672         return 0;
 673 }
 674
 675 static void pcan_usb_pro_handle_ts(struct pcan_usb_pro_interface *usb_if,
 676                                    struct pcan_usb_pro_rxts *ts)
 677 {
 678         /* should wait until clock is stabilized */
 679         if (usb_if->cm_ignore_count > 0)
 680                 usb_if->cm_ignore_count--;
 681         else
 682                 peak_usb_set_ts_now(&usb_if->time_ref,
 683                                     le32_to_cpu(ts->ts64[1]));
 684 }
 685
 686 /*
 687  * callback for bulk IN urb
 688  */
 689 static int pcan_usb_pro_decode_buf(struct peak_usb_device *dev, struct urb *urb)
 690 {
 691         struct pcan_usb_pro_interface *usb_if = pcan_usb_pro_dev_if(dev);
 692         struct net_device *netdev = dev->netdev;
 693         struct pcan_usb_pro_msg usb_msg;
 694         u8 *rec_ptr, *msg_end;
 695         u16 rec_cnt;
 696         int err = 0;
 697
 698         rec_ptr = pcan_msg_init(&usb_msg, urb->transfer_buffer,
 699                                         urb->actual_length);
 700         if (!rec_ptr) {
 701                 netdev_err(netdev, "bad msg hdr len %d\n", urb->actual_length);
 702                 return -EINVAL;
 703         }
 704
 705         /* loop reading all the records from the incoming message */
 706         msg_end = urb->transfer_buffer + urb->actual_length;
 707         rec_cnt = le16_to_cpu(*usb_msg.u.rec_cnt_rd);
 708         for (; rec_cnt > 0; rec_cnt--) {
 709                 union pcan_usb_pro_rec *pr = (union pcan_usb_pro_rec *)rec_ptr;
 710                 u16 sizeof_rec = pcan_usb_pro_sizeof_rec[pr->data_type];
 711
 712                 if (!sizeof_rec) {
 713                         netdev_err(netdev,
 714                                    "got unsupported rec in usb msg:\n");
 715                         err = -ENOTSUPP;
 716                         break;
 717                 }
 718
 719                 /* check if the record goes out of current packet */
 720                 if (rec_ptr + sizeof_rec > msg_end) {
 721                         netdev_err(netdev,
 722                                 "got frag rec: should inc usb rx buf size\n");
 723                         err = -EBADMSG;
 724                         break;
 725                 }
 726
 727                 switch (pr->data_type) {
 728                 case PCAN_USBPRO_RXMSG8:
 729                 case PCAN_USBPRO_RXMSG4:
 730                 case PCAN_USBPRO_RXMSG0:
 731                 case PCAN_USBPRO_RXRTR:
 732                         err = pcan_usb_pro_handle_canmsg(usb_if, &pr->rx_msg);
 733                         if (err < 0)
 734                                 goto fail;
 735                         break;
 736
 737                 case PCAN_USBPRO_RXSTATUS:
 738                         err = pcan_usb_pro_handle_error(usb_if, &pr->rx_status);
 739                         if (err < 0)
 740                                 goto fail;
 741                         break;
 742
 743                 case PCAN_USBPRO_RXTS:
 744                         pcan_usb_pro_handle_ts(usb_if, &pr->rx_ts);
 745                         break;
 746
 747                 default:
 748                         netdev_err(netdev,
 749                                    "unhandled rec type 0x%02x (%d): ignored\n",
 750                                    pr->data_type, pr->data_type);
 751                         break;
 752                 }
 753
 754                 rec_ptr += sizeof_rec;
 755         }
 756
 757 fail:
 758         if (err)
 759                 dump_mem("received msg",
 760                          urb->transfer_buffer, urb->actual_length);
 761
 762         return err;
 763 }
 764
 765 static int pcan_usb_pro_encode_msg(struct peak_usb_device *dev,
 766                                    struct sk_buff *skb, u8 *obuf, size_t *size)
 767 {
 768         struct can_frame *cf = (struct can_frame *)skb->data;
 769         u8 data_type, len, flags;
 770         struct pcan_usb_pro_msg usb_msg;
 771
 772         pcan_msg_init_empty(&usb_msg, obuf, *size);
 773
 774         if ((cf->can_id & CAN_RTR_FLAG) || (cf->can_dlc == 0))
 775                 data_type = PCAN_USBPRO_TXMSG0;
 776         else if (cf->can_dlc <= 4)
 777                 data_type = PCAN_USBPRO_TXMSG4;
 778         else
 779                 data_type = PCAN_USBPRO_TXMSG8;
 780
 781         len = (dev->ctrl_idx << 4) | (cf->can_dlc & 0x0f);
 782
 783         flags = 0;
 784         if (cf->can_id & CAN_EFF_FLAG)
 785                 flags |= 0x02;
 786         if (cf->can_id & CAN_RTR_FLAG)
 787                 flags |= 0x01;
 788
 789         pcan_msg_add_rec(&usb_msg, data_type, 0, flags, len, cf->can_id,
 790                          cf->data);
 791
 792         *size = usb_msg.rec_buffer_len;
 793
 794         return 0;
 795 }
 796
 797 static int pcan_usb_pro_start(struct peak_usb_device *dev)
 798 {
 799         struct pcan_usb_pro_device *pdev =
 800                         container_of(dev, struct pcan_usb_pro_device, dev);
 801         int err;
 802
 803         err = pcan_usb_pro_set_silent(dev,
 804                                 dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY);
 805         if (err)
 806                 return err;
 807
 808         /* filter mode: 0-> All OFF; 1->bypass */
 809         err = pcan_usb_pro_set_filter(dev, 1);
 810         if (err)
 811                 return err;
 812
 813         /* opening first device: */
 814         if (pdev->usb_if->dev_opened_count == 0) {
 815                 /* reset time_ref */
 816                 peak_usb_init_time_ref(&pdev->usb_if->time_ref, &pcan_usb_pro);
 817
 818                 /* ask device to send ts messages */
 819                 err = pcan_usb_pro_set_ts(dev, 1);
 820         }
 821
 822         pdev->usb_if->dev_opened_count++;
 823
 824         return err;
 825 }
 826
 827 /*
 828  * stop interface
 829  * (last chance before set bus off)
 830  */
 831 static int pcan_usb_pro_stop(struct peak_usb_device *dev)
 832 {
 833         struct pcan_usb_pro_device *pdev =
 834                         container_of(dev, struct pcan_usb_pro_device, dev);
 835
 836         /* turn off ts msgs for that interface if no other dev opened */
 837         if (pdev->usb_if->dev_opened_count == 1)
 838                 pcan_usb_pro_set_ts(dev, 0);
 839
 840         pdev->usb_if->dev_opened_count--;
 841
 842         return 0;
 843 }
 844
 845 /*
 846  * called when probing to initialize a device object.
 847  */
 848 static int pcan_usb_pro_init(struct peak_usb_device *dev)
 849 {
 850         struct pcan_usb_pro_interface *usb_if;
 851         struct pcan_usb_pro_device *pdev =
 852                         container_of(dev, struct pcan_usb_pro_device, dev);
 853
 854         /* do this for 1st channel only */
 855         if (!dev->prev_siblings) {
 856                 struct pcan_usb_pro_fwinfo fi;
 857                 struct pcan_usb_pro_blinfo bi;
 858                 int err;
 859
 860                 /* allocate netdevices common structure attached to first one */
 861                 usb_if = kzalloc(sizeof(struct pcan_usb_pro_interface),
 862                                  GFP_KERNEL);
 863                 if (!usb_if)
 864                         return -ENOMEM;
 865
 866                 /* number of ts msgs to ignore before taking one into account */
 867                 usb_if->cm_ignore_count = 5;
 868
 869                 /*
 870                  * explicit use of dev_xxx() instead of netdev_xxx() here:
 871                  * information displayed are related to the device itself, not
 872                  * to the canx netdevices.
 873                  */
 874                 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
 875                                             PCAN_USBPRO_INFO_FW,
 876                                             &fi, sizeof(fi));
 877                 if (err) {
 878                         kfree(usb_if);
 879                         dev_err(dev->netdev->dev.parent,
 880                                 "unable to read %s firmware info (err %d)\n",
 881                                 pcan_usb_pro.name, err);
 882                         return err;
 883                 }
 884
 885                 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
 886                                             PCAN_USBPRO_INFO_BL,
 887                                             &bi, sizeof(bi));
 888                 if (err) {
 889                         kfree(usb_if);
 890                         dev_err(dev->netdev->dev.parent,
 891                                 "unable to read %s bootloader info (err %d)\n",
 892                                 pcan_usb_pro.name, err);
 893                         return err;
 894                 }
 895
 896                 dev_info(dev->netdev->dev.parent,
 897                      "PEAK-System %s hwrev %u serial %08X.%08X (%u channels)\n",
 898                      pcan_usb_pro.name,
 899                      bi.hw_rev, bi.serial_num_hi, bi.serial_num_lo,
 900                      pcan_usb_pro.ctrl_count);
 901
 902                 /* tell the device the can driver is running */
 903                 pcan_usb_pro_drv_loaded(dev, 1);
 904         } else {
 905                 usb_if = pcan_usb_pro_dev_if(dev->prev_siblings);
 906         }
 907
 908         pdev->usb_if = usb_if;
 909         usb_if->dev[dev->ctrl_idx] = dev;
 910
 911         /* set LED in default state (end of init phase) */
 912         pcan_usb_pro_set_led(dev, 0, 1);
 913
 914         return 0;
 915 }
 916
 917 static void pcan_usb_pro_exit(struct peak_usb_device *dev)
 918 {
 919         struct pcan_usb_pro_device *pdev =
 920                         container_of(dev, struct pcan_usb_pro_device, dev);
 921
 922         /*
 923          * when rmmod called before unplug and if down, should reset things
 924          * before leaving
 925          */
 926         if (dev->can.state != CAN_STATE_STOPPED) {
 927                 /* set bus off on the corresponding channel */
 928                 pcan_usb_pro_set_bus(dev, 0);
 929         }
 930
 931         /* if channel #0 (only) */
 932         if (dev->ctrl_idx == 0) {
 933                 /* turn off calibration message if any device were opened */
 934                 if (pdev->usb_if->dev_opened_count > 0)
 935                         pcan_usb_pro_set_ts(dev, 0);
 936
 937                 /* tell the PCAN-USB Pro device the driver is being unloaded */
 938                 pcan_usb_pro_drv_loaded(dev, 0);
 939         }
 940 }
 941
 942 /*
 943  * called when PCAN-USB Pro adapter is unplugged
 944  */
 945 static void pcan_usb_pro_free(struct peak_usb_device *dev)
 946 {
 947         /* last device: can free pcan_usb_pro_interface object now */
 948         if (!dev->prev_siblings && !dev->next_siblings)
 949                 kfree(pcan_usb_pro_dev_if(dev));
 950 }
 951
 952 /*
 953  * probe function for new PCAN-USB Pro usb interface
 954  */
 955 static int pcan_usb_pro_probe(struct usb_interface *intf)
 956 {
 957         struct usb_host_interface *if_desc;
 958         int i;
 959
 960         if_desc = intf->altsetting;
 961
 962         /* check interface endpoint addresses */
 963         for (i = 0; i < if_desc->desc.bNumEndpoints; i++) {
 964                 struct usb_endpoint_descriptor *ep = &if_desc->endpoint[i].desc;
 965
 966                 /*
 967                  * below is the list of valid ep addreses. Any other ep address
 968                  * is considered as not-CAN interface address => no dev created
 969                  */
 970                 switch (ep->bEndpointAddress) {
 971                 case PCAN_USBPRO_EP_CMDOUT:
 972                 case PCAN_USBPRO_EP_CMDIN:
 973                 case PCAN_USBPRO_EP_MSGOUT_0:
 974                 case PCAN_USBPRO_EP_MSGOUT_1:
 975                 case PCAN_USBPRO_EP_MSGIN:
 976                 case PCAN_USBPRO_EP_UNUSED:
 977                         break;
 978                 default:
 979                         return -ENODEV;
 980                 }
 981         }
 982
 983         return 0;
 984 }
 985
 986 /*
 987  * describe the PCAN-USB Pro adapter
 988  */
 989 struct peak_usb_adapter pcan_usb_pro = {
 990         .name = "PCAN-USB Pro",
 991         .device_id = PCAN_USBPRO_PRODUCT_ID,
 992         .ctrl_count = PCAN_USBPRO_CHANNEL_COUNT,
 993         .clock = {
 994                 .freq = PCAN_USBPRO_CRYSTAL_HZ,
 995         },
 996         .bittiming_const = {
 997                 .name = "pcan_usb_pro",
 998                 .tseg1_min = 1,
 999                 .tseg1_max = 16,
1000                 .tseg2_min = 1,
1001                 .tseg2_max = 8,
1002                 .sjw_max = 4,
1003                 .brp_min = 1,
1004                 .brp_max = 1024,
1005                 .brp_inc = 1,
1006         },
1007
1008         /* size of device private data */
1009         .sizeof_dev_private = sizeof(struct pcan_usb_pro_device),
1010
1011         /* timestamps usage */
1012         .ts_used_bits = 32,
1013         .ts_period = 1000000, /* calibration period in ts. */
1014         .us_per_ts_scale = 1, /* us = (ts * scale) >> shift */
1015         .us_per_ts_shift = 0,
1016
1017         /* give here messages in/out endpoints */
1018         .ep_msg_in = PCAN_USBPRO_EP_MSGIN,
1019         .ep_msg_out = {PCAN_USBPRO_EP_MSGOUT_0, PCAN_USBPRO_EP_MSGOUT_1},
1020
1021         /* size of rx/tx usb buffers */
1022         .rx_buffer_size = PCAN_USBPRO_RX_BUFFER_SIZE,
1023         .tx_buffer_size = PCAN_USBPRO_TX_BUFFER_SIZE,
1024
1025         /* device callbacks */
1026         .intf_probe = pcan_usb_pro_probe,
1027         .dev_init = pcan_usb_pro_init,
1028         .dev_exit = pcan_usb_pro_exit,
1029         .dev_free = pcan_usb_pro_free,
1030         .dev_set_bus = pcan_usb_pro_set_bus,
1031         .dev_set_bittiming = pcan_usb_pro_set_bittiming,
1032         .dev_get_device_id = pcan_usb_pro_get_device_id,
1033         .dev_decode_buf = pcan_usb_pro_decode_buf,
1034         .dev_encode_msg = pcan_usb_pro_encode_msg,
1035         .dev_start = pcan_usb_pro_start,
1036         .dev_stop = pcan_usb_pro_stop,
1037         .dev_restart_async = pcan_usb_pro_restart_async,
1038 };