drivers/net/can/usb/peak_usb/pcan_usb

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This source file includes following definitions.
pcan_msg_init
pcan_msg_init_empty
pcan_msg_add_rec
pcan_usb_pro_send_cmd
pcan_usb_pro_wait_rsp
pcan_usb_pro_send_req
pcan_usb_pro_set_ts
pcan_usb_pro_set_bitrate
pcan_usb_pro_set_bus
pcan_usb_pro_set_silent
pcan_usb_pro_set_filter
pcan_usb_pro_set_led
pcan_usb_pro_get_device_id
pcan_usb_pro_set_bittiming
pcan_usb_pro_restart_complete
pcan_usb_pro_restart_async
pcan_usb_pro_drv_loaded
pcan_usb_pro_dev_if
pcan_usb_pro_handle_canmsg
pcan_usb_pro_handle_error
pcan_usb_pro_handle_ts
pcan_usb_pro_decode_buf
pcan_usb_pro_encode_msg
pcan_usb_pro_start
pcan_usb_pro_stop
pcan_usb_pro_init
pcan_usb_pro_exit
pcan_usb_pro_free
pcan_usb_pro_probe
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * CAN driver for PEAK System PCAN-USB Pro adapter
   4  * Derived from the PCAN project file driver/src/pcan_usbpro.c
   5  *
   6  * Copyright (C) 2003-2011 PEAK System-Technik GmbH
   7  * Copyright (C) 2011-2012 Stephane Grosjean <s.grosjean@peak-system.com>
   8  */
   9 #include <linux/netdevice.h>
  10 #include <linux/usb.h>
  11 #include <linux/module.h>
  12 
  13 #include <linux/can.h>
  14 #include <linux/can/dev.h>
  15 #include <linux/can/error.h>
  16 
  17 #include "pcan_usb_core.h"
  18 #include "pcan_usb_pro.h"
  19 
  20 MODULE_SUPPORTED_DEVICE("PEAK-System PCAN-USB Pro adapter");
  21 
  22 #define PCAN_USBPRO_CHANNEL_COUNT       2
  23 
  24 /* PCAN-USB Pro adapter internal clock (MHz) */
  25 #define PCAN_USBPRO_CRYSTAL_HZ          56000000
  26 
  27 /* PCAN-USB Pro command timeout (ms.) */
  28 #define PCAN_USBPRO_COMMAND_TIMEOUT     1000
  29 
  30 /* PCAN-USB Pro rx/tx buffers size */
  31 #define PCAN_USBPRO_RX_BUFFER_SIZE      1024
  32 #define PCAN_USBPRO_TX_BUFFER_SIZE      64
  33 
  34 #define PCAN_USBPRO_MSG_HEADER_LEN      4
  35 
  36 /* some commands responses need to be re-submitted */
  37 #define PCAN_USBPRO_RSP_SUBMIT_MAX      2
  38 
  39 #define PCAN_USBPRO_RTR                 0x01
  40 #define PCAN_USBPRO_EXT                 0x02
  41 
  42 #define PCAN_USBPRO_CMD_BUFFER_SIZE     512
  43 
  44 /* handle device specific info used by the netdevices */
  45 struct pcan_usb_pro_interface {
  46         struct peak_usb_device *dev[PCAN_USBPRO_CHANNEL_COUNT];
  47         struct peak_time_ref time_ref;
  48         int cm_ignore_count;
  49         int dev_opened_count;
  50 };
  51 
  52 /* device information */
  53 struct pcan_usb_pro_device {
  54         struct peak_usb_device dev;
  55         struct pcan_usb_pro_interface *usb_if;
  56         u32 cached_ccbt;
  57 };
  58 
  59 /* internal structure used to handle messages sent to bulk urb */
  60 struct pcan_usb_pro_msg {
  61         u8 *rec_ptr;
  62         int rec_buffer_size;
  63         int rec_buffer_len;
  64         union {
  65                 __le16 *rec_cnt_rd;
  66                 __le32 *rec_cnt;
  67                 u8 *rec_buffer;
  68         } u;
  69 };
  70 
  71 /* records sizes table indexed on message id. (8-bits value) */
  72 static u16 pcan_usb_pro_sizeof_rec[256] = {
  73         [PCAN_USBPRO_SETBTR] = sizeof(struct pcan_usb_pro_btr),
  74         [PCAN_USBPRO_SETBUSACT] = sizeof(struct pcan_usb_pro_busact),
  75         [PCAN_USBPRO_SETSILENT] = sizeof(struct pcan_usb_pro_silent),
  76         [PCAN_USBPRO_SETFILTR] = sizeof(struct pcan_usb_pro_filter),
  77         [PCAN_USBPRO_SETTS] = sizeof(struct pcan_usb_pro_setts),
  78         [PCAN_USBPRO_GETDEVID] = sizeof(struct pcan_usb_pro_devid),
  79         [PCAN_USBPRO_SETLED] = sizeof(struct pcan_usb_pro_setled),
  80         [PCAN_USBPRO_RXMSG8] = sizeof(struct pcan_usb_pro_rxmsg),
  81         [PCAN_USBPRO_RXMSG4] = sizeof(struct pcan_usb_pro_rxmsg) - 4,
  82         [PCAN_USBPRO_RXMSG0] = sizeof(struct pcan_usb_pro_rxmsg) - 8,
  83         [PCAN_USBPRO_RXRTR] = sizeof(struct pcan_usb_pro_rxmsg) - 8,
  84         [PCAN_USBPRO_RXSTATUS] = sizeof(struct pcan_usb_pro_rxstatus),
  85         [PCAN_USBPRO_RXTS] = sizeof(struct pcan_usb_pro_rxts),
  86         [PCAN_USBPRO_TXMSG8] = sizeof(struct pcan_usb_pro_txmsg),
  87         [PCAN_USBPRO_TXMSG4] = sizeof(struct pcan_usb_pro_txmsg) - 4,
  88         [PCAN_USBPRO_TXMSG0] = sizeof(struct pcan_usb_pro_txmsg) - 8,
  89 };
  90 
  91 /*
  92  * initialize PCAN-USB Pro message data structure
  93  */
  94 static u8 *pcan_msg_init(struct pcan_usb_pro_msg *pm, void *buffer_addr,
  95                          int buffer_size)
  96 {
  97         if (buffer_size < PCAN_USBPRO_MSG_HEADER_LEN)
  98                 return NULL;
  99 
 100         pm->u.rec_buffer = (u8 *)buffer_addr;
 101         pm->rec_buffer_size = pm->rec_buffer_len = buffer_size;
 102         pm->rec_ptr = pm->u.rec_buffer + PCAN_USBPRO_MSG_HEADER_LEN;
 103 
 104         return pm->rec_ptr;
 105 }
 106 
 107 static u8 *pcan_msg_init_empty(struct pcan_usb_pro_msg *pm,
 108                                void *buffer_addr, int buffer_size)
 109 {
 110         u8 *pr = pcan_msg_init(pm, buffer_addr, buffer_size);
 111 
 112         if (pr) {
 113                 pm->rec_buffer_len = PCAN_USBPRO_MSG_HEADER_LEN;
 114                 *pm->u.rec_cnt = 0;
 115         }
 116         return pr;
 117 }
 118 
 119 /*
 120  * add one record to a message being built
 121  */
 122 static int pcan_msg_add_rec(struct pcan_usb_pro_msg *pm, int id, ...)
 123 {
 124         int len, i;
 125         u8 *pc;
 126         va_list ap;
 127 
 128         va_start(ap, id);
 129 
 130         pc = pm->rec_ptr + 1;
 131 
 132         i = 0;
 133         switch (id) {
 134         case PCAN_USBPRO_TXMSG8:
 135                 i += 4;
 136                 /* fall through */
 137         case PCAN_USBPRO_TXMSG4:
 138                 i += 4;
 139                 /* fall through */
 140         case PCAN_USBPRO_TXMSG0:
 141                 *pc++ = va_arg(ap, int);
 142                 *pc++ = va_arg(ap, int);
 143                 *pc++ = va_arg(ap, int);
 144                 *(__le32 *)pc = cpu_to_le32(va_arg(ap, u32));
 145                 pc += 4;
 146                 memcpy(pc, va_arg(ap, int *), i);
 147                 pc += i;
 148                 break;
 149 
 150         case PCAN_USBPRO_SETBTR:
 151         case PCAN_USBPRO_GETDEVID:
 152                 *pc++ = va_arg(ap, int);
 153                 pc += 2;
 154                 *(__le32 *)pc = cpu_to_le32(va_arg(ap, u32));
 155                 pc += 4;
 156                 break;
 157 
 158         case PCAN_USBPRO_SETFILTR:
 159         case PCAN_USBPRO_SETBUSACT:
 160         case PCAN_USBPRO_SETSILENT:
 161                 *pc++ = va_arg(ap, int);
 162                 *(__le16 *)pc = cpu_to_le16(va_arg(ap, int));
 163                 pc += 2;
 164                 break;
 165 
 166         case PCAN_USBPRO_SETLED:
 167                 *pc++ = va_arg(ap, int);
 168                 *(__le16 *)pc = cpu_to_le16(va_arg(ap, int));
 169                 pc += 2;
 170                 *(__le32 *)pc = cpu_to_le32(va_arg(ap, u32));
 171                 pc += 4;
 172                 break;
 173 
 174         case PCAN_USBPRO_SETTS:
 175                 pc++;
 176                 *(__le16 *)pc = cpu_to_le16(va_arg(ap, int));
 177                 pc += 2;
 178                 break;
 179 
 180         default:
 181                 pr_err("%s: %s(): unknown data type %02Xh (%d)\n",
 182                         PCAN_USB_DRIVER_NAME, __func__, id, id);
 183                 pc--;
 184                 break;
 185         }
 186 
 187         len = pc - pm->rec_ptr;
 188         if (len > 0) {
 189                 *pm->u.rec_cnt = cpu_to_le32(le32_to_cpu(*pm->u.rec_cnt) + 1);
 190                 *pm->rec_ptr = id;
 191 
 192                 pm->rec_ptr = pc;
 193                 pm->rec_buffer_len += len;
 194         }
 195 
 196         va_end(ap);
 197 
 198         return len;
 199 }
 200 
 201 /*
 202  * send PCAN-USB Pro command synchronously
 203  */
 204 static int pcan_usb_pro_send_cmd(struct peak_usb_device *dev,
 205                                  struct pcan_usb_pro_msg *pum)
 206 {
 207         int actual_length;
 208         int err;
 209 
 210         /* usb device unregistered? */
 211         if (!(dev->state & PCAN_USB_STATE_CONNECTED))
 212                 return 0;
 213 
 214         err = usb_bulk_msg(dev->udev,
 215                 usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT),
 216                 pum->u.rec_buffer, pum->rec_buffer_len,
 217                 &actual_length, PCAN_USBPRO_COMMAND_TIMEOUT);
 218         if (err)
 219                 netdev_err(dev->netdev, "sending command failure: %d\n", err);
 220 
 221         return err;
 222 }
 223 
 224 /*
 225  * wait for PCAN-USB Pro command response
 226  */
 227 static int pcan_usb_pro_wait_rsp(struct peak_usb_device *dev,
 228                                  struct pcan_usb_pro_msg *pum)
 229 {
 230         u8 req_data_type, req_channel;
 231         int actual_length;
 232         int i, err = 0;
 233 
 234         /* usb device unregistered? */
 235         if (!(dev->state & PCAN_USB_STATE_CONNECTED))
 236                 return 0;
 237 
 238         req_data_type = pum->u.rec_buffer[4];
 239         req_channel = pum->u.rec_buffer[5];
 240 
 241         *pum->u.rec_cnt = 0;
 242         for (i = 0; !err && i < PCAN_USBPRO_RSP_SUBMIT_MAX; i++) {
 243                 struct pcan_usb_pro_msg rsp;
 244                 union pcan_usb_pro_rec *pr;
 245                 u32 r, rec_cnt;
 246                 u16 rec_len;
 247                 u8 *pc;
 248 
 249                 err = usb_bulk_msg(dev->udev,
 250                         usb_rcvbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDIN),
 251                         pum->u.rec_buffer, pum->rec_buffer_len,
 252                         &actual_length, PCAN_USBPRO_COMMAND_TIMEOUT);
 253                 if (err) {
 254                         netdev_err(dev->netdev, "waiting rsp error %d\n", err);
 255                         break;
 256                 }
 257 
 258                 if (actual_length == 0)
 259                         continue;
 260 
 261                 err = -EBADMSG;
 262                 if (actual_length < PCAN_USBPRO_MSG_HEADER_LEN) {
 263                         netdev_err(dev->netdev,
 264                                    "got abnormal too small rsp (len=%d)\n",
 265                                    actual_length);
 266                         break;
 267                 }
 268 
 269                 pc = pcan_msg_init(&rsp, pum->u.rec_buffer,
 270                         actual_length);
 271 
 272                 rec_cnt = le32_to_cpu(*rsp.u.rec_cnt);
 273 
 274                 /* loop on records stored into message */
 275                 for (r = 0; r < rec_cnt; r++) {
 276                         pr = (union pcan_usb_pro_rec *)pc;
 277                         rec_len = pcan_usb_pro_sizeof_rec[pr->data_type];
 278                         if (!rec_len) {
 279                                 netdev_err(dev->netdev,
 280                                            "got unprocessed record in msg\n");
 281                                 pcan_dump_mem("rcvd rsp msg", pum->u.rec_buffer,
 282                                               actual_length);
 283                                 break;
 284                         }
 285 
 286                         /* check if response corresponds to request */
 287                         if (pr->data_type != req_data_type)
 288                                 netdev_err(dev->netdev,
 289                                            "got unwanted rsp %xh: ignored\n",
 290                                            pr->data_type);
 291 
 292                         /* check if channel in response corresponds too */
 293                         else if ((req_channel != 0xff) && \
 294                                 (pr->bus_act.channel != req_channel))
 295                                 netdev_err(dev->netdev,
 296                                         "got rsp %xh but on chan%u: ignored\n",
 297                                         req_data_type, pr->bus_act.channel);
 298 
 299                         /* got the response */
 300                         else
 301                                 return 0;
 302 
 303                         /* otherwise, go on with next record in message */
 304                         pc += rec_len;
 305                 }
 306         }
 307 
 308         return (i >= PCAN_USBPRO_RSP_SUBMIT_MAX) ? -ERANGE : err;
 309 }
 310 
 311 int pcan_usb_pro_send_req(struct peak_usb_device *dev, int req_id,
 312                           int req_value, void *req_addr, int req_size)
 313 {
 314         int err;
 315         u8 req_type;
 316         unsigned int p;
 317 
 318         /* usb device unregistered? */
 319         if (!(dev->state & PCAN_USB_STATE_CONNECTED))
 320                 return 0;
 321 
 322         req_type = USB_TYPE_VENDOR | USB_RECIP_OTHER;
 323 
 324         switch (req_id) {
 325         case PCAN_USBPRO_REQ_FCT:
 326                 p = usb_sndctrlpipe(dev->udev, 0);
 327                 break;
 328 
 329         default:
 330                 p = usb_rcvctrlpipe(dev->udev, 0);
 331                 req_type |= USB_DIR_IN;
 332                 memset(req_addr, '\0', req_size);
 333                 break;
 334         }
 335 
 336         err = usb_control_msg(dev->udev, p, req_id, req_type, req_value, 0,
 337                               req_addr, req_size, 2 * USB_CTRL_GET_TIMEOUT);
 338         if (err < 0) {
 339                 netdev_info(dev->netdev,
 340                             "unable to request usb[type=%d value=%d] err=%d\n",
 341                             req_id, req_value, err);
 342                 return err;
 343         }
 344 
 345         return 0;
 346 }
 347 
 348 static int pcan_usb_pro_set_ts(struct peak_usb_device *dev, u16 onoff)
 349 {
 350         struct pcan_usb_pro_msg um;
 351 
 352         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 353         pcan_msg_add_rec(&um, PCAN_USBPRO_SETTS, onoff);
 354 
 355         return pcan_usb_pro_send_cmd(dev, &um);
 356 }
 357 
 358 static int pcan_usb_pro_set_bitrate(struct peak_usb_device *dev, u32 ccbt)
 359 {
 360         struct pcan_usb_pro_device *pdev =
 361                         container_of(dev, struct pcan_usb_pro_device, dev);
 362         struct pcan_usb_pro_msg um;
 363 
 364         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 365         pcan_msg_add_rec(&um, PCAN_USBPRO_SETBTR, dev->ctrl_idx, ccbt);
 366 
 367         /* cache the CCBT value to reuse it before next buson */
 368         pdev->cached_ccbt = ccbt;
 369 
 370         return pcan_usb_pro_send_cmd(dev, &um);
 371 }
 372 
 373 static int pcan_usb_pro_set_bus(struct peak_usb_device *dev, u8 onoff)
 374 {
 375         struct pcan_usb_pro_msg um;
 376 
 377         /* if bus=on, be sure the bitrate being set before! */
 378         if (onoff) {
 379                 struct pcan_usb_pro_device *pdev =
 380                              container_of(dev, struct pcan_usb_pro_device, dev);
 381 
 382                 pcan_usb_pro_set_bitrate(dev, pdev->cached_ccbt);
 383         }
 384 
 385         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 386         pcan_msg_add_rec(&um, PCAN_USBPRO_SETBUSACT, dev->ctrl_idx, onoff);
 387 
 388         return pcan_usb_pro_send_cmd(dev, &um);
 389 }
 390 
 391 static int pcan_usb_pro_set_silent(struct peak_usb_device *dev, u8 onoff)
 392 {
 393         struct pcan_usb_pro_msg um;
 394 
 395         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 396         pcan_msg_add_rec(&um, PCAN_USBPRO_SETSILENT, dev->ctrl_idx, onoff);
 397 
 398         return pcan_usb_pro_send_cmd(dev, &um);
 399 }
 400 
 401 static int pcan_usb_pro_set_filter(struct peak_usb_device *dev, u16 filter_mode)
 402 {
 403         struct pcan_usb_pro_msg um;
 404 
 405         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 406         pcan_msg_add_rec(&um, PCAN_USBPRO_SETFILTR, dev->ctrl_idx, filter_mode);
 407 
 408         return pcan_usb_pro_send_cmd(dev, &um);
 409 }
 410 
 411 static int pcan_usb_pro_set_led(struct peak_usb_device *dev, u8 mode,
 412                                 u32 timeout)
 413 {
 414         struct pcan_usb_pro_msg um;
 415 
 416         pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 417         pcan_msg_add_rec(&um, PCAN_USBPRO_SETLED, dev->ctrl_idx, mode, timeout);
 418 
 419         return pcan_usb_pro_send_cmd(dev, &um);
 420 }
 421 
 422 static int pcan_usb_pro_get_device_id(struct peak_usb_device *dev,
 423                                       u32 *device_id)
 424 {
 425         struct pcan_usb_pro_devid *pdn;
 426         struct pcan_usb_pro_msg um;
 427         int err;
 428         u8 *pc;
 429 
 430         pc = pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
 431         pcan_msg_add_rec(&um, PCAN_USBPRO_GETDEVID, dev->ctrl_idx);
 432 
 433         err =  pcan_usb_pro_send_cmd(dev, &um);
 434         if (err)
 435                 return err;
 436 
 437         err = pcan_usb_pro_wait_rsp(dev, &um);
 438         if (err)
 439                 return err;
 440 
 441         pdn = (struct pcan_usb_pro_devid *)pc;
 442         if (device_id)
 443                 *device_id = le32_to_cpu(pdn->serial_num);
 444 
 445         return err;
 446 }
 447 
 448 static int pcan_usb_pro_set_bittiming(struct peak_usb_device *dev,
 449                                       struct can_bittiming *bt)
 450 {
 451         u32 ccbt;
 452 
 453         ccbt = (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) ? 0x00800000 : 0;
 454         ccbt |= (bt->sjw - 1) << 24;
 455         ccbt |= (bt->phase_seg2 - 1) << 20;
 456         ccbt |= (bt->prop_seg + bt->phase_seg1 - 1) << 16; /* = tseg1 */
 457         ccbt |= bt->brp - 1;
 458 
 459         netdev_info(dev->netdev, "setting ccbt=0x%08x\n", ccbt);
 460 
 461         return pcan_usb_pro_set_bitrate(dev, ccbt);
 462 }
 463 
 464 void pcan_usb_pro_restart_complete(struct urb *urb)
 465 {
 466         /* can delete usb resources */
 467         peak_usb_async_complete(urb);
 468 
 469         /* notify candev and netdev */
 470         peak_usb_restart_complete(urb->context);
 471 }
 472 
 473 /*
 474  * handle restart but in asynchronously way
 475  */
 476 static int pcan_usb_pro_restart_async(struct peak_usb_device *dev,
 477                                       struct urb *urb, u8 *buf)
 478 {
 479         struct pcan_usb_pro_msg um;
 480 
 481         pcan_msg_init_empty(&um, buf, PCAN_USB_MAX_CMD_LEN);
 482         pcan_msg_add_rec(&um, PCAN_USBPRO_SETBUSACT, dev->ctrl_idx, 1);
 483 
 484         usb_fill_bulk_urb(urb, dev->udev,
 485                         usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT),
 486                         buf, PCAN_USB_MAX_CMD_LEN,
 487                         pcan_usb_pro_restart_complete, dev);
 488 
 489         return usb_submit_urb(urb, GFP_ATOMIC);
 490 }
 491 
 492 static int pcan_usb_pro_drv_loaded(struct peak_usb_device *dev, int loaded)
 493 {
 494         u8 *buffer;
 495         int err;
 496 
 497         buffer = kzalloc(PCAN_USBPRO_FCT_DRVLD_REQ_LEN, GFP_KERNEL);
 498         if (!buffer)
 499                 return -ENOMEM;
 500 
 501         buffer[0] = 0;
 502         buffer[1] = !!loaded;
 503 
 504         err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_FCT,
 505                                     PCAN_USBPRO_FCT_DRVLD, buffer,
 506                                     PCAN_USBPRO_FCT_DRVLD_REQ_LEN);
 507         kfree(buffer);
 508 
 509         return err;
 510 }
 511 
 512 static inline
 513 struct pcan_usb_pro_interface *pcan_usb_pro_dev_if(struct peak_usb_device *dev)
 514 {
 515         struct pcan_usb_pro_device *pdev =
 516                         container_of(dev, struct pcan_usb_pro_device, dev);
 517         return pdev->usb_if;
 518 }
 519 
 520 static int pcan_usb_pro_handle_canmsg(struct pcan_usb_pro_interface *usb_if,
 521                                       struct pcan_usb_pro_rxmsg *rx)
 522 {
 523         const unsigned int ctrl_idx = (rx->len >> 4) & 0x0f;
 524         struct peak_usb_device *dev = usb_if->dev[ctrl_idx];
 525         struct net_device *netdev = dev->netdev;
 526         struct can_frame *can_frame;
 527         struct sk_buff *skb;
 528         struct skb_shared_hwtstamps *hwts;
 529 
 530         skb = alloc_can_skb(netdev, &can_frame);
 531         if (!skb)
 532                 return -ENOMEM;
 533 
 534         can_frame->can_id = le32_to_cpu(rx->id);
 535         can_frame->can_dlc = rx->len & 0x0f;
 536 
 537         if (rx->flags & PCAN_USBPRO_EXT)
 538                 can_frame->can_id |= CAN_EFF_FLAG;
 539 
 540         if (rx->flags & PCAN_USBPRO_RTR)
 541                 can_frame->can_id |= CAN_RTR_FLAG;
 542         else
 543                 memcpy(can_frame->data, rx->data, can_frame->can_dlc);
 544 
 545         hwts = skb_hwtstamps(skb);
 546         peak_usb_get_ts_time(&usb_if->time_ref, le32_to_cpu(rx->ts32),
 547                              &hwts->hwtstamp);
 548 
 549         netdev->stats.rx_packets++;
 550         netdev->stats.rx_bytes += can_frame->can_dlc;
 551         netif_rx(skb);
 552 
 553         return 0;
 554 }
 555 
 556 static int pcan_usb_pro_handle_error(struct pcan_usb_pro_interface *usb_if,
 557                                      struct pcan_usb_pro_rxstatus *er)
 558 {
 559         const u16 raw_status = le16_to_cpu(er->status);
 560         const unsigned int ctrl_idx = (er->channel >> 4) & 0x0f;
 561         struct peak_usb_device *dev = usb_if->dev[ctrl_idx];
 562         struct net_device *netdev = dev->netdev;
 563         struct can_frame *can_frame;
 564         enum can_state new_state = CAN_STATE_ERROR_ACTIVE;
 565         u8 err_mask = 0;
 566         struct sk_buff *skb;
 567         struct skb_shared_hwtstamps *hwts;
 568 
 569         /* nothing should be sent while in BUS_OFF state */
 570         if (dev->can.state == CAN_STATE_BUS_OFF)
 571                 return 0;
 572 
 573         if (!raw_status) {
 574                 /* no error bit (back to active state) */
 575                 dev->can.state = CAN_STATE_ERROR_ACTIVE;
 576                 return 0;
 577         }
 578 
 579         if (raw_status & (PCAN_USBPRO_STATUS_OVERRUN |
 580                           PCAN_USBPRO_STATUS_QOVERRUN)) {
 581                 /* trick to bypass next comparison and process other errors */
 582                 new_state = CAN_STATE_MAX;
 583         }
 584 
 585         if (raw_status & PCAN_USBPRO_STATUS_BUS) {
 586                 new_state = CAN_STATE_BUS_OFF;
 587         } else if (raw_status & PCAN_USBPRO_STATUS_ERROR) {
 588                 u32 rx_err_cnt = (le32_to_cpu(er->err_frm) & 0x00ff0000) >> 16;
 589                 u32 tx_err_cnt = (le32_to_cpu(er->err_frm) & 0xff000000) >> 24;
 590 
 591                 if (rx_err_cnt > 127)
 592                         err_mask |= CAN_ERR_CRTL_RX_PASSIVE;
 593                 else if (rx_err_cnt > 96)
 594                         err_mask |= CAN_ERR_CRTL_RX_WARNING;
 595 
 596                 if (tx_err_cnt > 127)
 597                         err_mask |= CAN_ERR_CRTL_TX_PASSIVE;
 598                 else if (tx_err_cnt > 96)
 599                         err_mask |= CAN_ERR_CRTL_TX_WARNING;
 600 
 601                 if (err_mask & (CAN_ERR_CRTL_RX_WARNING |
 602                                 CAN_ERR_CRTL_TX_WARNING))
 603                         new_state = CAN_STATE_ERROR_WARNING;
 604                 else if (err_mask & (CAN_ERR_CRTL_RX_PASSIVE |
 605                                      CAN_ERR_CRTL_TX_PASSIVE))
 606                         new_state = CAN_STATE_ERROR_PASSIVE;
 607         }
 608 
 609         /* donot post any error if current state didn't change */
 610         if (dev->can.state == new_state)
 611                 return 0;
 612 
 613         /* allocate an skb to store the error frame */
 614         skb = alloc_can_err_skb(netdev, &can_frame);
 615         if (!skb)
 616                 return -ENOMEM;
 617 
 618         switch (new_state) {
 619         case CAN_STATE_BUS_OFF:
 620                 can_frame->can_id |= CAN_ERR_BUSOFF;
 621                 dev->can.can_stats.bus_off++;
 622                 can_bus_off(netdev);
 623                 break;
 624 
 625         case CAN_STATE_ERROR_PASSIVE:
 626                 can_frame->can_id |= CAN_ERR_CRTL;
 627                 can_frame->data[1] |= err_mask;
 628                 dev->can.can_stats.error_passive++;
 629                 break;
 630 
 631         case CAN_STATE_ERROR_WARNING:
 632                 can_frame->can_id |= CAN_ERR_CRTL;
 633                 can_frame->data[1] |= err_mask;
 634                 dev->can.can_stats.error_warning++;
 635                 break;
 636 
 637         case CAN_STATE_ERROR_ACTIVE:
 638                 break;
 639 
 640         default:
 641                 /* CAN_STATE_MAX (trick to handle other errors) */
 642                 if (raw_status & PCAN_USBPRO_STATUS_OVERRUN) {
 643                         can_frame->can_id |= CAN_ERR_PROT;
 644                         can_frame->data[2] |= CAN_ERR_PROT_OVERLOAD;
 645                         netdev->stats.rx_over_errors++;
 646                         netdev->stats.rx_errors++;
 647                 }
 648 
 649                 if (raw_status & PCAN_USBPRO_STATUS_QOVERRUN) {
 650                         can_frame->can_id |= CAN_ERR_CRTL;
 651                         can_frame->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
 652                         netdev->stats.rx_over_errors++;
 653                         netdev->stats.rx_errors++;
 654                 }
 655 
 656                 new_state = CAN_STATE_ERROR_ACTIVE;
 657                 break;
 658         }
 659 
 660         dev->can.state = new_state;
 661 
 662         hwts = skb_hwtstamps(skb);
 663         peak_usb_get_ts_time(&usb_if->time_ref, le32_to_cpu(er->ts32), &hwts->hwtstamp);
 664         netdev->stats.rx_packets++;
 665         netdev->stats.rx_bytes += can_frame->can_dlc;
 666         netif_rx(skb);
 667 
 668         return 0;
 669 }
 670 
 671 static void pcan_usb_pro_handle_ts(struct pcan_usb_pro_interface *usb_if,
 672                                    struct pcan_usb_pro_rxts *ts)
 673 {
 674         /* should wait until clock is stabilized */
 675         if (usb_if->cm_ignore_count > 0)
 676                 usb_if->cm_ignore_count--;
 677         else
 678                 peak_usb_set_ts_now(&usb_if->time_ref,
 679                                     le32_to_cpu(ts->ts64[1]));
 680 }
 681 
 682 /*
 683  * callback for bulk IN urb
 684  */
 685 static int pcan_usb_pro_decode_buf(struct peak_usb_device *dev, struct urb *urb)
 686 {
 687         struct pcan_usb_pro_interface *usb_if = pcan_usb_pro_dev_if(dev);
 688         struct net_device *netdev = dev->netdev;
 689         struct pcan_usb_pro_msg usb_msg;
 690         u8 *rec_ptr, *msg_end;
 691         u16 rec_cnt;
 692         int err = 0;
 693 
 694         rec_ptr = pcan_msg_init(&usb_msg, urb->transfer_buffer,
 695                                         urb->actual_length);
 696         if (!rec_ptr) {
 697                 netdev_err(netdev, "bad msg hdr len %d\n", urb->actual_length);
 698                 return -EINVAL;
 699         }
 700 
 701         /* loop reading all the records from the incoming message */
 702         msg_end = urb->transfer_buffer + urb->actual_length;
 703         rec_cnt = le16_to_cpu(*usb_msg.u.rec_cnt_rd);
 704         for (; rec_cnt > 0; rec_cnt--) {
 705                 union pcan_usb_pro_rec *pr = (union pcan_usb_pro_rec *)rec_ptr;
 706                 u16 sizeof_rec = pcan_usb_pro_sizeof_rec[pr->data_type];
 707 
 708                 if (!sizeof_rec) {
 709                         netdev_err(netdev,
 710                                    "got unsupported rec in usb msg:\n");
 711                         err = -ENOTSUPP;
 712                         break;
 713                 }
 714 
 715                 /* check if the record goes out of current packet */
 716                 if (rec_ptr + sizeof_rec > msg_end) {
 717                         netdev_err(netdev,
 718                                 "got frag rec: should inc usb rx buf size\n");
 719                         err = -EBADMSG;
 720                         break;
 721                 }
 722 
 723                 switch (pr->data_type) {
 724                 case PCAN_USBPRO_RXMSG8:
 725                 case PCAN_USBPRO_RXMSG4:
 726                 case PCAN_USBPRO_RXMSG0:
 727                 case PCAN_USBPRO_RXRTR:
 728                         err = pcan_usb_pro_handle_canmsg(usb_if, &pr->rx_msg);
 729                         if (err < 0)
 730                                 goto fail;
 731                         break;
 732 
 733                 case PCAN_USBPRO_RXSTATUS:
 734                         err = pcan_usb_pro_handle_error(usb_if, &pr->rx_status);
 735                         if (err < 0)
 736                                 goto fail;
 737                         break;
 738 
 739                 case PCAN_USBPRO_RXTS:
 740                         pcan_usb_pro_handle_ts(usb_if, &pr->rx_ts);
 741                         break;
 742 
 743                 default:
 744                         netdev_err(netdev,
 745                                    "unhandled rec type 0x%02x (%d): ignored\n",
 746                                    pr->data_type, pr->data_type);
 747                         break;
 748                 }
 749 
 750                 rec_ptr += sizeof_rec;
 751         }
 752 
 753 fail:
 754         if (err)
 755                 pcan_dump_mem("received msg",
 756                               urb->transfer_buffer, urb->actual_length);
 757 
 758         return err;
 759 }
 760 
 761 static int pcan_usb_pro_encode_msg(struct peak_usb_device *dev,
 762                                    struct sk_buff *skb, u8 *obuf, size_t *size)
 763 {
 764         struct can_frame *cf = (struct can_frame *)skb->data;
 765         u8 data_type, len, flags;
 766         struct pcan_usb_pro_msg usb_msg;
 767 
 768         pcan_msg_init_empty(&usb_msg, obuf, *size);
 769 
 770         if ((cf->can_id & CAN_RTR_FLAG) || (cf->can_dlc == 0))
 771                 data_type = PCAN_USBPRO_TXMSG0;
 772         else if (cf->can_dlc <= 4)
 773                 data_type = PCAN_USBPRO_TXMSG4;
 774         else
 775                 data_type = PCAN_USBPRO_TXMSG8;
 776 
 777         len = (dev->ctrl_idx << 4) | (cf->can_dlc & 0x0f);
 778 
 779         flags = 0;
 780         if (cf->can_id & CAN_EFF_FLAG)
 781                 flags |= 0x02;
 782         if (cf->can_id & CAN_RTR_FLAG)
 783                 flags |= 0x01;
 784 
 785         pcan_msg_add_rec(&usb_msg, data_type, 0, flags, len, cf->can_id,
 786                          cf->data);
 787 
 788         *size = usb_msg.rec_buffer_len;
 789 
 790         return 0;
 791 }
 792 
 793 static int pcan_usb_pro_start(struct peak_usb_device *dev)
 794 {
 795         struct pcan_usb_pro_device *pdev =
 796                         container_of(dev, struct pcan_usb_pro_device, dev);
 797         int err;
 798 
 799         err = pcan_usb_pro_set_silent(dev,
 800                                 dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY);
 801         if (err)
 802                 return err;
 803 
 804         /* filter mode: 0-> All OFF; 1->bypass */
 805         err = pcan_usb_pro_set_filter(dev, 1);
 806         if (err)
 807                 return err;
 808 
 809         /* opening first device: */
 810         if (pdev->usb_if->dev_opened_count == 0) {
 811                 /* reset time_ref */
 812                 peak_usb_init_time_ref(&pdev->usb_if->time_ref, &pcan_usb_pro);
 813 
 814                 /* ask device to send ts messages */
 815                 err = pcan_usb_pro_set_ts(dev, 1);
 816         }
 817 
 818         pdev->usb_if->dev_opened_count++;
 819 
 820         return err;
 821 }
 822 
 823 /*
 824  * stop interface
 825  * (last chance before set bus off)
 826  */
 827 static int pcan_usb_pro_stop(struct peak_usb_device *dev)
 828 {
 829         struct pcan_usb_pro_device *pdev =
 830                         container_of(dev, struct pcan_usb_pro_device, dev);
 831 
 832         /* turn off ts msgs for that interface if no other dev opened */
 833         if (pdev->usb_if->dev_opened_count == 1)
 834                 pcan_usb_pro_set_ts(dev, 0);
 835 
 836         pdev->usb_if->dev_opened_count--;
 837 
 838         return 0;
 839 }
 840 
 841 /*
 842  * called when probing to initialize a device object.
 843  */
 844 static int pcan_usb_pro_init(struct peak_usb_device *dev)
 845 {
 846         struct pcan_usb_pro_device *pdev =
 847                         container_of(dev, struct pcan_usb_pro_device, dev);
 848         struct pcan_usb_pro_interface *usb_if = NULL;
 849         struct pcan_usb_pro_fwinfo *fi = NULL;
 850         struct pcan_usb_pro_blinfo *bi = NULL;
 851         int err;
 852 
 853         /* do this for 1st channel only */
 854         if (!dev->prev_siblings) {
 855                 /* allocate netdevices common structure attached to first one */
 856                 usb_if = kzalloc(sizeof(struct pcan_usb_pro_interface),
 857                                  GFP_KERNEL);
 858                 fi = kmalloc(sizeof(struct pcan_usb_pro_fwinfo), GFP_KERNEL);
 859                 bi = kmalloc(sizeof(struct pcan_usb_pro_blinfo), GFP_KERNEL);
 860                 if (!usb_if || !fi || !bi) {
 861                         err = -ENOMEM;
 862                         goto err_out;
 863                 }
 864 
 865                 /* number of ts msgs to ignore before taking one into account */
 866                 usb_if->cm_ignore_count = 5;
 867 
 868                 /*
 869                  * explicit use of dev_xxx() instead of netdev_xxx() here:
 870                  * information displayed are related to the device itself, not
 871                  * to the canx netdevices.
 872                  */
 873                 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
 874                                             PCAN_USBPRO_INFO_FW,
 875                                             fi, sizeof(*fi));
 876                 if (err) {
 877                         dev_err(dev->netdev->dev.parent,
 878                                 "unable to read %s firmware info (err %d)\n",
 879                                 pcan_usb_pro.name, err);
 880                         goto err_out;
 881                 }
 882 
 883                 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
 884                                             PCAN_USBPRO_INFO_BL,
 885                                             bi, sizeof(*bi));
 886                 if (err) {
 887                         dev_err(dev->netdev->dev.parent,
 888                                 "unable to read %s bootloader info (err %d)\n",
 889                                 pcan_usb_pro.name, err);
 890                         goto err_out;
 891                 }
 892 
 893                 /* tell the device the can driver is running */
 894                 err = pcan_usb_pro_drv_loaded(dev, 1);
 895                 if (err)
 896                         goto err_out;
 897 
 898                 dev_info(dev->netdev->dev.parent,
 899                      "PEAK-System %s hwrev %u serial %08X.%08X (%u channels)\n",
 900                      pcan_usb_pro.name,
 901                      bi->hw_rev, bi->serial_num_hi, bi->serial_num_lo,
 902                      pcan_usb_pro.ctrl_count);
 903         } else {
 904                 usb_if = pcan_usb_pro_dev_if(dev->prev_siblings);
 905         }
 906 
 907         pdev->usb_if = usb_if;
 908         usb_if->dev[dev->ctrl_idx] = dev;
 909 
 910         /* set LED in default state (end of init phase) */
 911         pcan_usb_pro_set_led(dev, 0, 1);
 912 
 913         kfree(bi);
 914         kfree(fi);
 915 
 916         return 0;
 917 
 918  err_out:
 919         kfree(bi);
 920         kfree(fi);
 921         kfree(usb_if);
 922 
 923         return err;
 924 }
 925 
 926 static void pcan_usb_pro_exit(struct peak_usb_device *dev)
 927 {
 928         struct pcan_usb_pro_device *pdev =
 929                         container_of(dev, struct pcan_usb_pro_device, dev);
 930 
 931         /*
 932          * when rmmod called before unplug and if down, should reset things
 933          * before leaving
 934          */
 935         if (dev->can.state != CAN_STATE_STOPPED) {
 936                 /* set bus off on the corresponding channel */
 937                 pcan_usb_pro_set_bus(dev, 0);
 938         }
 939 
 940         /* if channel #0 (only) */
 941         if (dev->ctrl_idx == 0) {
 942                 /* turn off calibration message if any device were opened */
 943                 if (pdev->usb_if->dev_opened_count > 0)
 944                         pcan_usb_pro_set_ts(dev, 0);
 945 
 946                 /* tell the PCAN-USB Pro device the driver is being unloaded */
 947                 pcan_usb_pro_drv_loaded(dev, 0);
 948         }
 949 }
 950 
 951 /*
 952  * called when PCAN-USB Pro adapter is unplugged
 953  */
 954 static void pcan_usb_pro_free(struct peak_usb_device *dev)
 955 {
 956         /* last device: can free pcan_usb_pro_interface object now */
 957         if (!dev->prev_siblings && !dev->next_siblings)
 958                 kfree(pcan_usb_pro_dev_if(dev));
 959 }
 960 
 961 /*
 962  * probe function for new PCAN-USB Pro usb interface
 963  */
 964 int pcan_usb_pro_probe(struct usb_interface *intf)
 965 {
 966         struct usb_host_interface *if_desc;
 967         int i;
 968 
 969         if_desc = intf->altsetting;
 970 
 971         /* check interface endpoint addresses */
 972         for (i = 0; i < if_desc->desc.bNumEndpoints; i++) {
 973                 struct usb_endpoint_descriptor *ep = &if_desc->endpoint[i].desc;
 974 
 975                 /*
 976                  * below is the list of valid ep addreses. Any other ep address
 977                  * is considered as not-CAN interface address => no dev created
 978                  */
 979                 switch (ep->bEndpointAddress) {
 980                 case PCAN_USBPRO_EP_CMDOUT:
 981                 case PCAN_USBPRO_EP_CMDIN:
 982                 case PCAN_USBPRO_EP_MSGOUT_0:
 983                 case PCAN_USBPRO_EP_MSGOUT_1:
 984                 case PCAN_USBPRO_EP_MSGIN:
 985                 case PCAN_USBPRO_EP_UNUSED:
 986                         break;
 987                 default:
 988                         return -ENODEV;
 989                 }
 990         }
 991 
 992         return 0;
 993 }
 994 
 995 /*
 996  * describe the PCAN-USB Pro adapter
 997  */
 998 static const struct can_bittiming_const pcan_usb_pro_const = {
 999         .name = "pcan_usb_pro",
1000         .tseg1_min = 1,
1001         .tseg1_max = 16,
1002         .tseg2_min = 1,
1003         .tseg2_max = 8,
1004         .sjw_max = 4,
1005         .brp_min = 1,
1006         .brp_max = 1024,
1007         .brp_inc = 1,
1008 };
1009 
1010 const struct peak_usb_adapter pcan_usb_pro = {
1011         .name = "PCAN-USB Pro",
1012         .device_id = PCAN_USBPRO_PRODUCT_ID,
1013         .ctrl_count = PCAN_USBPRO_CHANNEL_COUNT,
1014         .ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
1015         .clock = {
1016                 .freq = PCAN_USBPRO_CRYSTAL_HZ,
1017         },
1018         .bittiming_const = &pcan_usb_pro_const,
1019 
1020         /* size of device private data */
1021         .sizeof_dev_private = sizeof(struct pcan_usb_pro_device),
1022 
1023         /* timestamps usage */
1024         .ts_used_bits = 32,
1025         .ts_period = 1000000, /* calibration period in ts. */
1026         .us_per_ts_scale = 1, /* us = (ts * scale) >> shift */
1027         .us_per_ts_shift = 0,
1028 
1029         /* give here messages in/out endpoints */
1030         .ep_msg_in = PCAN_USBPRO_EP_MSGIN,
1031         .ep_msg_out = {PCAN_USBPRO_EP_MSGOUT_0, PCAN_USBPRO_EP_MSGOUT_1},
1032 
1033         /* size of rx/tx usb buffers */
1034         .rx_buffer_size = PCAN_USBPRO_RX_BUFFER_SIZE,
1035         .tx_buffer_size = PCAN_USBPRO_TX_BUFFER_SIZE,
1036 
1037         /* device callbacks */
1038         .intf_probe = pcan_usb_pro_probe,
1039         .dev_init = pcan_usb_pro_init,
1040         .dev_exit = pcan_usb_pro_exit,
1041         .dev_free = pcan_usb_pro_free,
1042         .dev_set_bus = pcan_usb_pro_set_bus,
1043         .dev_set_bittiming = pcan_usb_pro_set_bittiming,
1044         .dev_get_device_id = pcan_usb_pro_get_device_id,
1045         .dev_decode_buf = pcan_usb_pro_decode_buf,
1046         .dev_encode_msg = pcan_usb_pro_encode_msg,
1047         .dev_start = pcan_usb_pro_start,
1048         .dev_stop = pcan_usb_pro_stop,
1049         .dev_restart_async = pcan_usb_pro_restart_async,
1050 };
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/can/usb/peak_usb/pcan_usb_pro.c

DEFINITIONS
