lincan/src/usbcan.c

   1 /* usbcan.h
   2  * Header file for the Linux CAN-bus driver.
   3  * Written by Jan Kriz email:johen@post.cz
   4  * This software is released under the GPL-License.
   5  * Version lincan-0.3  17 Jul 2008
   6  */
   7
   8 #include "../include/can.h"
   9 #include "../include/can_sysdep.h"
  10 #include "../include/main.h"
  11 #include "../include/devcommon.h"
  12 #include "../include/setup.h"
  13 #include "../include/usbcan.h"
  14
  15 static int usbcan_probe(struct usb_interface *interface, const struct usb_device_id *id);
  16 static void usbcan_disconnect(struct usb_interface *interface);
  17
  18 /* table of devices that work with this driver */
  19 static struct usb_device_id usbcan_table [] = {
  20         { USB_DEVICE(USBCAN_VENDOR_ID, USBCAN_PRODUCT_ID) },
  21         { }                                     /* Terminating entry */
  22 };
  23 MODULE_DEVICE_TABLE(usb, usbcan_table);
  24
  25 static struct usb_driver usbcan_driver = {
  26         .name =         "usbcan",
  27         .id_table = usbcan_table,
  28         .probe =        usbcan_probe,
  29         .disconnect =   usbcan_disconnect,
  30 };
  31
  32 /**
  33  * usbcan_request_io: - reserve io or memory range for can board
  34  * @candev: pointer to candevice/board which asks for io. Field @io_addr
  35  *      of @candev is used in most cases to define start of the range
  36  *
  37  * The function usbcan_request_io() is used to reserve the io-memory. If your
  38  * hardware uses a dedicated memory range as hardware control registers you
  39  * will have to add the code to reserve this memory as well.
  40  * %IO_RANGE is the io-memory range that gets reserved, please adjust according
  41  * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or
  42  * #define IO_RANGE 0x20 for sja1000 chips in basic CAN mode.
  43  * Return Value: The function returns zero on success or %-ENODEV on failure
  44  * File: src/usbcan.c
  45  */
  46 int usbcan_request_io(struct candevice_t *candev)
  47 {
  48         struct usbcan_usb *dev = (struct usbcan_usb*)candev->sysdevptr.anydev;
  49
  50         /* start kernel thread */
  51         dev->rcvthread.arg = dev;
  52         start_kthread(usbcan_read_kthread, &dev->rcvthread);
  53
  54         /* Adding link to can device into usbcan_usb struct */
  55         ((struct usbcan_usb*)candev->sysdevptr.anydev)->candev=candev;
  56         return 0;
  57 }
  58
  59 /**
  60  * usbcan_release_io - free reserved io memory range
  61  * @candev: pointer to candevice/board which releases io
  62  *
  63  * The function usbcan_release_io() is used to free reserved io-memory.
  64  * In case you have reserved more io memory, don't forget to free it here.
  65  * IO_RANGE is the io-memory range that gets released, please adjust according
  66  * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or
  67  * #define IO_RANGE 0x20 for sja1000 chips in basic CAN mode.
  68  * Return Value: The function always returns zero
  69  * File: src/usbcan.c
  70  */
  71 int usbcan_release_io(struct candevice_t *candev)
  72 {
  73         struct usbcan_usb *dev = ((struct usbcan_usb*)candev->sysdevptr.anydev);
  74
  75         /* terminate the kernel thread */
  76         if (dev->rcv){
  77                 usb_kill_urb(dev->rcv);
  78                 usb_free_urb(dev->rcv);
  79         }
  80         stop_kthread(&dev->rcvthread);
  81         return 0;
  82 }
  83
  84 /**
  85  * usbcan_reset - hardware reset routine
  86  * @candev: Pointer to candevice/board structure
  87  *
  88  * The function usbcan_reset() is used to give a hardware reset. This is
  89  * rather hardware specific so I haven't included example code. Don't forget to
  90  * check the reset status of the chip before returning.
  91  * Return Value: The function returns zero on success or %-ENODEV on failure
  92  * File: src/usbcan.c
  93  */
  94 int usbcan_reset(struct candevice_t *candev)
  95 {
  96         return 0;
  97 }
  98
  99 /**
 100  * usbcan_init_hw_data - Initialize hardware cards
 101  * @candev: Pointer to candevice/board structure
 102  *
 103  * The function usbcan_init_hw_data() is used to initialize the hardware
 104  * structure containing information about the installed CAN-board.
 105  * %RESET_ADDR represents the io-address of the hardware reset register.
 106  * %NR_82527 represents the number of Intel 82527 chips on the board.
 107  * %NR_SJA1000 represents the number of Philips sja1000 chips on the board.
 108  * The flags entry can currently only be %CANDEV_PROGRAMMABLE_IRQ to indicate that
 109  * the hardware uses programmable interrupts.
 110  * Return Value: The function always returns zero
 111  * File: src/usbcan.c
 112  */
 113 int usbcan_init_hw_data(struct candevice_t *candev)
 114 {
 115         candev->res_addr=RESET_ADDR;
 116         candev->nr_82527_chips=0;
 117         candev->nr_sja1000_chips=0;
 118         candev->nr_all_chips=1;
 119         candev->flags |= CANDEV_PROGRAMMABLE_IRQ*0;
 120
 121         return 0;
 122 }
 123
 124 /**
 125  * usbcan_init_obj_data - Initialize message buffers
 126  * @chip: Pointer to chip specific structure
 127  * @objnr: Number of the message buffer
 128  *
 129  * The function usbcan_init_obj_data() is used to initialize the hardware
 130  * structure containing information about the different message objects on the
 131  * CAN chip. In case of the sja1000 there's only one message object but on the
 132  * i82527 chip there are 15.
 133  * The code below is for a i82527 chip and initializes the object base addresses
 134  * The entry @obj_base_addr represents the first memory address of the message
 135  * object. In case of the sja1000 @obj_base_addr is taken the same as the chips
 136  * base address.
 137  * Unless the hardware uses a segmented memory map, flags can be set zero.
 138  * Return Value: The function always returns zero
 139  * File: src/usbcan.c
 140  */
 141 int usbcan_init_obj_data(struct canchip_t *chip, int objnr)
 142 {
 143         chip->msgobj[objnr]->obj_base_addr=chip->chip_base_addr+(objnr+1)*0x10;
 144
 145         return 0;
 146 }
 147
 148 /**
 149  * usbcan_program_irq - program interrupts
 150  * @candev: Pointer to candevice/board structure
 151  *
 152  * The function usbcan_program_irq() is used for hardware that uses
 153  * programmable interrupts. If your hardware doesn't use programmable interrupts
 154  * you should not set the @candevices_t->flags entry to %CANDEV_PROGRAMMABLE_IRQ and
 155  * leave this function unedited. Again this function is hardware specific so
 156  * there's no example code.
 157  * Return value: The function returns zero on success or %-ENODEV on failure
 158  * File: src/usbcan.c
 159  */
 160 int usbcan_program_irq(struct candevice_t *candev)
 161 {
 162         return 0;
 163 }
 164
 165 /* !!! Don't change this function !!! */
 166 int usbcan_register(struct hwspecops_t *hwspecops)
 167 {
 168         hwspecops->request_io = usbcan_request_io;
 169         hwspecops->release_io = usbcan_release_io;
 170         hwspecops->reset = usbcan_reset;
 171         hwspecops->init_hw_data = usbcan_init_hw_data;
 172         hwspecops->init_chip_data = usbcan_init_chip_data;
 173         hwspecops->init_obj_data = usbcan_init_obj_data;
 174         hwspecops->write_register = NULL;
 175         hwspecops->read_register = NULL;
 176         hwspecops->program_irq = usbcan_program_irq;
 177         return 0;
 178 }
 179
 180 static int sja1000_report_error_limit_counter;
 181
 182 static void sja1000_report_error(struct canchip_t *chip,
 183                                 unsigned sr, unsigned ir, unsigned ecc)
 184 {
 185         /*TODO : Error reporting from device */
 186
 187 /*      if(sja1000_report_error_limit_counter>=100)
 188                 return;
 189
 190         CANMSG("Error: status register: 0x%x irq_register: 0x%02x error: 0x%02x\n",
 191                 sr, ir, ecc);
 192
 193         sja1000_report_error_limit_counter+=10;
 194
 195         if(sja1000_report_error_limit_counter>=100){
 196                 sja1000_report_error_limit_counter+=10;
 197                 CANMSG("Error: too many errors, reporting disabled\n");
 198                 return;
 199         }
 200
 201 #ifdef CONFIG_OC_LINCAN_DETAILED_ERRORS
 202         CANMSG("SR: BS=%c  ES=%c  TS=%c  RS=%c  TCS=%c TBS=%c DOS=%c RBS=%c\n",
 203                 sr&sjaSR_BS?'1':'0',sr&sjaSR_ES?'1':'0',
 204                 sr&sjaSR_TS?'1':'0',sr&sjaSR_RS?'1':'0',
 205                 sr&sjaSR_TCS?'1':'0',sr&sjaSR_TBS?'1':'0',
 206                 sr&sjaSR_DOS?'1':'0',sr&sjaSR_RBS?'1':'0');
 207         CANMSG("IR: BEI=%c ALI=%c EPI=%c WUI=%c DOI=%c EI=%c  TI=%c  RI=%c\n",
 208                 sr&sjaIR_BEI?'1':'0',sr&sjaIR_ALI?'1':'0',
 209                 sr&sjaIR_EPI?'1':'0',sr&sjaIR_WUI?'1':'0',
 210                 sr&sjaIR_DOI?'1':'0',sr&sjaIR_EI?'1':'0',
 211                 sr&sjaIR_TI?'1':'0',sr&sjaIR_RI?'1':'0');
 212         if((sr&sjaIR_EI) || 1){
 213                 CANMSG("EI: %s %s %s\n",
 214                        sja1000_ecc_errc_str[(ecc&(sjaECC_ERCC1|sjaECC_ERCC0))/sjaECC_ERCC0],
 215                        ecc&sjaECC_DIR?"RX":"TX",
 216                        sja1000_ecc_seg_str[ecc&sjaECC_SEG_M]
 217                       );
 218         }
 219 #endif /*CONFIG_OC_LINCAN_DETAILED_ERRORS*/
 220 }
 221
 222
 223 /**
 224  * usbcan_enable_configuration - enable chip configuration mode
 225  * @chip: pointer to chip state structure
 226  */
 227 int usbcan_enable_configuration(struct canchip_t *chip)
 228 {
 229         return 0;
 230 }
 231
 232 /**
 233  * usbcan_disable_configuration - disable chip configuration mode
 234  * @chip: pointer to chip state structure
 235  */
 236 int usbcan_disable_configuration(struct canchip_t *chip)
 237 {
 238         return 0;
 239 }
 240
 241 /**
 242  * usbcan_chip_config: - can chip configuration
 243  * @chip: pointer to chip state structure
 244  *
 245  * This function configures chip and prepares it for message
 246  * transmission and reception. The function resets chip,
 247  * resets mask for acceptance of all messages by call to
 248  * usbcan_extended_mask() function and then
 249  * computes and sets baudrate with use of function usbcan_baud_rate().
 250  * Return Value: negative value reports error.
 251  * File: src/usbcan.c
 252  */
 253 int usbcan_chip_config(struct canchip_t *chip)
 254 {
 255         return 0;
 256 }
 257
 258 /**
 259  * usbcan_extended_mask: - setup of extended mask for message filtering
 260  * @chip: pointer to chip state structure
 261  * @code: can message acceptance code
 262  * @mask: can message acceptance mask
 263  *
 264  * Return Value: negative value reports error.
 265  * File: src/usbcan.c
 266  */
 267 int usbcan_extended_mask(struct canchip_t *chip, unsigned long code, unsigned  long mask)
 268 {
 269         int retval;
 270         struct usbcan_usb *dev=(struct usbcan_usb*)chip->hostdevice->sysdevptr.anydev;
 271
 272         __u8 usbbuf[16];
 273
 274         *(uint32_t *)(usbbuf)=cpu_to_le32(mask);
 275         *(uint32_t *)(usbbuf+4)=cpu_to_le32(code);
 276
 277         retval=usb_control_msg(dev->udev,
 278                 usb_sndctrlpipe(dev->udev, dev->ctl_out_endpointAddr),
 279                 USBCAN_VENDOR_EXT_MASK_SET,
 280                 USB_TYPE_VENDOR,
 281                 0, chip->chip_idx,
 282                 &usbbuf, 16,
 283                 10000);
 284         if (retval<0)
 285                 return -ENODEV;
 286
 287         retval = usb_control_msg(dev->udev,
 288                 usb_rcvctrlpipe(dev->udev, dev->ctl_in_endpointAddr),
 289                 USBCAN_VENDOR_EXT_MASK_STATUS,
 290                 USB_TYPE_VENDOR,
 291                 0, chip->chip_idx,
 292                 &usbbuf, 16,
 293                 10000);
 294
 295         if (retval==16){
 296                 if(usbbuf[0]==1){
 297                         DEBUGMSG("Setting acceptance code to 0x%lx\n",(unsigned long)code);
 298                         DEBUGMSG("Setting acceptance mask to 0x%lx\n",(unsigned long)mask);
 299                         return 0;
 300                 }
 301         }
 302
 303         CANMSG("Setting extended mask failed\n");
 304         return -EINVAL;
 305 }
 306
 307 /**
 308  * usbcan_baud_rate: - set communication parameters.
 309  * @chip: pointer to chip state structure
 310  * @rate: baud rate in Hz
 311  * @clock: frequency of sja1000 clock in Hz (ISA osc is 14318000)
 312  * @sjw: synchronization jump width (0-3) prescaled clock cycles
 313  * @sampl_pt: sample point in % (0-100) sets (TSEG1+1)/(TSEG1+TSEG2+2) ratio
 314  * @flags: fields %BTR1_SAM, %OCMODE, %OCPOL, %OCTP, %OCTN, %CLK_OFF, %CBP
 315  *
 316  * Return Value: negative value reports error.
 317  * File: src/usbcan.c
 318  */
 319 int usbcan_baud_rate(struct canchip_t *chip, int rate, int clock, int sjw,
 320                                                         int sampl_pt, int flags)
 321 {
 322         int retval;
 323         struct usbcan_usb *dev=(struct usbcan_usb*)chip->hostdevice->sysdevptr.anydev;
 324
 325         __u8 usbbuf[16];
 326
 327         *(int32_t *)(usbbuf)=cpu_to_le32(rate);
 328         *(int32_t *)(usbbuf+4)=cpu_to_le32(sjw);
 329         *(int32_t *)(usbbuf+8)=cpu_to_le32(sampl_pt);
 330         *(int32_t *)(usbbuf+12)=cpu_to_le32(flags);
 331
 332         retval=usb_control_msg(dev->udev,
 333                 usb_sndctrlpipe(dev->udev, dev->ctl_out_endpointAddr),
 334                 USBCAN_VENDOR_BAUD_RATE_SET,
 335                 USB_TYPE_VENDOR,
 336                 0, chip->chip_idx,
 337                 &usbbuf, 16,
 338                 10000);
 339         if (retval<0)
 340                 return -ENODEV;
 341
 342         retval = usb_control_msg(dev->udev,
 343                 usb_rcvctrlpipe(dev->udev, dev->ctl_in_endpointAddr),
 344                 USBCAN_VENDOR_BAUD_RATE_STATUS,
 345                 USB_TYPE_VENDOR,
 346                 0, chip->chip_idx,
 347                 usbbuf, 16,
 348                 10000);
 349
 350         if (retval==16){
 351                 if(usbbuf[0]==1)
 352                         return 0;
 353         }
 354
 355         CANMSG("baud rate %d is not possible to set\n",
 356                 rate);
 357         return -EINVAL;
 358 }
 359
 360 /**
 361  * usbcan_pre_read_config: - prepares message object for message reception
 362  * @chip: pointer to chip state structure
 363  * @obj: pointer to message object state structure
 364  *
 365  * Return Value: negative value reports error.
 366  *      Positive value indicates immediate reception of message.
 367  * File: src/usbcan.c
 368  */
 369 int usbcan_pre_read_config(struct canchip_t *chip, struct msgobj_t *obj)
 370 {
 371         return 0;
 372 }
 373
 374 #define MAX_TRANSMIT_WAIT_LOOPS 10
 375 /**
 376  * usbcan_pre_write_config: - prepares message object for message transmission
 377  * @chip: pointer to chip state structure
 378  * @obj: pointer to message object state structure
 379  * @msg: pointer to CAN message
 380  *
 381  * This function prepares selected message object for future initiation
 382  * of message transmission by usbcan_send_msg() function.
 383  * The CAN message data and message ID are transfered from @msg slot
 384  * into chip buffer in this function.
 385  * Return Value: negative value reports error.
 386  * File: src/usbcan.c
 387  */
 388 int usbcan_pre_write_config(struct canchip_t *chip, struct msgobj_t *obj,
 389                                                         struct canmsg_t *msg)
 390 {
 391         struct usbcan_usb *dev=(struct usbcan_usb*)chip->hostdevice->sysdevptr.anydev;
 392         int i=0;
 393         int len;
 394         __u8 *ptr;
 395
 396         /* Wait until Transmit Buffer Status is released */
 397         while ( usbcan_chip_queue_status(chip) &&
 398                                                 i++<MAX_TRANSMIT_WAIT_LOOPS) {
 399                 udelay(i);
 400         }
 401         if (usbcan_chip_queue_status(chip)){
 402                 CANMSG("Buffer full, cannot send message\n");
 403                 return -EIO;
 404         }
 405
 406         *(uint8_t *)(dev->tx_msg)=chip->chip_idx & 0xFF;
 407
 408         len = msg->length;
 409         if(len > CAN_MSG_LENGTH) len = CAN_MSG_LENGTH;
 410
 411         *(uint8_t *)(dev->tx_msg+1)=len & 0xFF;
 412         *(uint16_t *)(dev->tx_msg+2)=cpu_to_le16(msg->flags);
 413         *(uint32_t *)(dev->tx_msg+4)=cpu_to_le32(msg->id);
 414
 415         for(ptr=dev->tx_msg+8,i=0; i < len; ptr++,i++) {
 416                 *ptr=msg->data[i] & 0xFF;
 417         }
 418         for(; i < 8; ptr++,i++) {
 419                 *ptr=0;
 420         }
 421         return 0;
 422 }
 423
 424 /**
 425  * usbcan_send_msg: - initiate message transmission
 426  * @chip: pointer to chip state structure
 427  * @obj: pointer to message object state structure
 428  * @msg: pointer to CAN message
 429  *
 430  * This function is called after usbcan_pre_write_config() function,
 431  * which prepares data in chip buffer.
 432  * Return Value: negative value reports error.
 433  * File: src/usbcan.c
 434  */
 435 int usbcan_send_msg(struct canchip_t *chip, struct msgobj_t *obj,
 436                                                         struct canmsg_t *msg)
 437 {
 438         struct usbcan_usb *dev=(struct usbcan_usb*)chip->hostdevice->sysdevptr.anydev;
 439         int len,retval;
 440
 441         set_bit(USBCAN_TX_PENDING,&dev->flags);
 442         retval=usb_bulk_msg(dev->udev,
 443                         usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
 444                         &dev->tx_msg, 16,
 445                         &len,10000);
 446         clear_bit(USBCAN_TX_PENDING,&dev->flags);
 447         if (retval){
 448                 CANMSG("URB error %d\n",retval);
 449                 return -EIO;
 450         }
 451         if (len!=sizeof(struct usbcan_canmsg_t)){
 452                 CANMSG("CAN message not sent\n");
 453                 return -EIO;
 454         }
 455
 456         return 0;
 457 }
 458
 459 /**
 460  * usbcan_check_tx_stat: - checks state of transmission engine
 461  * @chip: pointer to chip state structure
 462  *
 463  * Return Value: negative value reports error.
 464  *      Positive return value indicates transmission under way status.
 465  *      Zero value indicates finishing of all issued transmission requests.
 466  * File: src/usbcan.c
 467  */
 468 int usbcan_check_tx_stat(struct canchip_t *chip)
 469 {
 470         if (test_bit(USBCAN_TX_PENDING,&((struct usbcan_usb*)chip->hostdevice->sysdevptr.anydev)->flags))
 471                 return 1;
 472         return 0;
 473 }
 474
 475 /**
 476  * usbcan_set_btregs: -  configures bitrate registers
 477  * @chip: pointer to chip state structure
 478  * @btr0: bitrate register 0
 479  * @btr1: bitrate register 1
 480  *
 481  * Return Value: negative value reports error.
 482  * File: src/usbcan.c
 483  */
 484 int usbcan_set_btregs(struct canchip_t *chip, unsigned short btr0,
 485                                                         unsigned short btr1)
 486 {
 487         int retval;
 488         struct usbcan_usb *dev=(struct usbcan_usb*)chip->hostdevice->sysdevptr.anydev;
 489         uint16_t value=(btr1&0xFF)<<8 | (btr0&0xFF);
 490
 491         retval = usb_control_msg(dev->udev,
 492         usb_rcvctrlpipe(dev->udev, dev->ctl_in_endpointAddr),
 493         USBCAN_VENDOR_SET_BTREGS,
 494         USB_TYPE_VENDOR,
 495         cpu_to_le16(value), chip->chip_idx,
 496         dev->ctl_in_buffer, dev->ctl_in_size,
 497         10000);
 498
 499         if (retval==1){
 500                 if(dev->ctl_in_buffer[0]==1)
 501                         return 0;
 502         }
 503         return -ENODEV;
 504 }
 505
 506 /**
 507  * usbcan_start_chip: -  starts chip message processing
 508  * @chip: pointer to chip state structure
 509  *
 510  * Return Value: negative value reports error.
 511  * File: src/usbcan.c
 512  */
 513 int usbcan_start_chip(struct canchip_t *chip)
 514 {
 515         int retval;
 516         struct usbcan_usb *dev=(struct usbcan_usb*)chip->hostdevice->sysdevptr.anydev;
 517
 518         retval = usb_control_msg(dev->udev,
 519         usb_rcvctrlpipe(dev->udev, dev->ctl_in_endpointAddr),
 520         USBCAN_VENDOR_START_CHIP,
 521         USB_TYPE_VENDOR,
 522         0, chip->chip_idx,
 523         dev->ctl_in_buffer, dev->ctl_in_size,
 524         10000);
 525
 526         if (retval==1){
 527                 if(dev->ctl_in_buffer[0]==1)
 528                         return 0;
 529         }
 530         return -ENODEV;
 531 }
 532
 533 /**
 534  * usbcan_chip_queue_status: -  gets queue status from usb device
 535  * @chip: pointer to chip state structure
 536  *
 537  * Return Value: negative value reports error.
 538  * 0 means queue is not full
 539  * 1 means queue is full
 540  * File: src/usbcan.c
 541  */
 542 int usbcan_chip_queue_status(struct canchip_t *chip)
 543 {
 544         int retval;
 545         struct usbcan_usb *dev=(struct usbcan_usb*)chip->hostdevice->sysdevptr.anydev;
 546
 547         retval = usb_control_msg(dev->udev,
 548         usb_rcvctrlpipe(dev->udev, dev->ctl_in_endpointAddr),
 549         USBCAN_VENDOR_CHECK_TX_STAT,
 550         USB_TYPE_VENDOR,
 551         0, chip->chip_idx,
 552         dev->ctl_in_buffer, dev->ctl_in_size,
 553         10000);
 554
 555         if (retval==1){
 556                 if(dev->ctl_in_buffer[0]==1)
 557                         return 0;
 558                 if(dev->ctl_in_buffer[0]==0)
 559                         return 1;
 560         }
 561         return -ENODEV;
 562 }
 563
 564 /**
 565  * usbcan_stop_chip: -  stops chip message processing
 566  * @chip: pointer to chip state structure
 567  *
 568  * Return Value: negative value reports error.
 569  * File: src/usbcan.c
 570  */
 571 int usbcan_stop_chip(struct canchip_t *chip)
 572 {
 573         int retval;
 574         struct usbcan_usb *dev=(struct usbcan_usb*)chip->hostdevice->sysdevptr.anydev;
 575
 576         retval = usb_control_msg(dev->udev,
 577         usb_rcvctrlpipe(dev->udev, dev->ctl_in_endpointAddr),
 578         USBCAN_VENDOR_STOP_CHIP,
 579         USB_TYPE_VENDOR,
 580         0, chip->chip_idx,
 581         dev->ctl_in_buffer, dev->ctl_in_size,
 582         10000);
 583
 584         if (retval==1){
 585                 if(dev->ctl_in_buffer[0]==1)
 586                         return 0;
 587         }
 588         return -ENODEV;
 589 }
 590
 591 /**
 592  * usbcan_attach_to_chip: - attaches to the chip, setups registers and state
 593  * @chip: pointer to chip state structure
 594  *
 595  * Return Value: negative value reports error.
 596  * File: src/usbcan.c
 597  */
 598 int usbcan_attach_to_chip(struct canchip_t *chip)
 599 {
 600         return 0;
 601 }
 602
 603 /**
 604  * usbcan_release_chip: - called before chip structure removal if %CHIP_ATTACHED is set
 605  * @chip: pointer to chip state structure
 606  *
 607  * Return Value: negative value reports error.
 608  * File: src/usbcan.c
 609  */
 610 int usbcan_release_chip(struct canchip_t *chip)
 611 {
 612         usbcan_stop_chip(chip);
 613         return 0;
 614 }
 615
 616 /**
 617  * usbcan_remote_request: - configures message object and asks for RTR message
 618  * @chip: pointer to chip state structure
 619  * @obj: pointer to message object structure
 620  *
 621  * Return Value: negative value reports error.
 622  * File: src/usbcan.c
 623  */
 624 int usbcan_remote_request(struct canchip_t *chip, struct msgobj_t *obj)
 625 {
 626         CANMSG("usbcan_remote_request not implemented\n");
 627         return -ENOSYS;
 628 }
 629
 630 /**
 631  * usbcan_standard_mask: - setup of mask for message filtering
 632  * @chip: pointer to chip state structure
 633  * @code: can message acceptance code
 634  * @mask: can message acceptance mask
 635  *
 636  * Return Value: negative value reports error.
 637  * File: src/usbcan.c
 638  */
 639 int usbcan_standard_mask(struct canchip_t *chip, unsigned short code,
 640                 unsigned short mask)
 641 {
 642         CANMSG("usbcan_standard_mask not implemented\n");
 643         return -ENOSYS;
 644 }
 645
 646 /**
 647  * usbcan_clear_objects: - clears state of all message object residing in chip
 648  * @chip: pointer to chip state structure
 649  *
 650  * Return Value: negative value reports error.
 651  * File: src/usbcan.c
 652  */
 653 int usbcan_clear_objects(struct canchip_t *chip)
 654 {
 655         CANMSG("usbcan_clear_objects not implemented\n");
 656         return -ENOSYS;
 657 }
 658
 659 /**
 660  * usbcan_config_irqs: - tunes chip hardware interrupt delivery
 661  * @chip: pointer to chip state structure
 662  * @irqs: requested chip IRQ configuration
 663  *
 664  * Return Value: negative value reports error.
 665  * File: src/usbcan.c
 666  */
 667 int usbcan_config_irqs(struct canchip_t *chip, short irqs)
 668 {
 669         CANMSG("usbcan_config_irqs not implemented\n");
 670         return -ENOSYS;
 671 }
 672
 673 /**
 674  * usbcan_irq_write_handler: - part of ISR code responsible for transmit events
 675  * @chip: pointer to chip state structure
 676  * @obj: pointer to attached queue description
 677  *
 678  * The main purpose of this function is to read message from attached queues
 679  * and transfer message contents into CAN controller chip.
 680  * This subroutine is called by
 681  * usbcan_irq_write_handler() for transmit events.
 682  * File: src/usbcan.c
 683  */
 684 void usbcan_irq_write_handler(struct canchip_t *chip, struct msgobj_t *obj)
 685 {
 686         int cmd;
 687
 688         if(obj->tx_slot){
 689                 // Do local transmitted message distribution if enabled
 690                 if (processlocal){
 691                         // fill CAN message timestamp
 692                         can_filltimestamp(&obj->tx_slot->msg.timestamp);
 693
 694                         obj->tx_slot->msg.flags |= MSG_LOCAL;
 695                         canque_filter_msg2edges(obj->qends, &obj->tx_slot->msg);
 696                 }
 697                 // Free transmitted slot
 698                 canque_free_outslot(obj->qends, obj->tx_qedge, obj->tx_slot);
 699                 obj->tx_slot=NULL;
 700         }
 701
 702         can_msgobj_clear_fl(obj,TX_PENDING);
 703         cmd=canque_test_outslot(obj->qends, &obj->tx_qedge, &obj->tx_slot);
 704         if(cmd<0)
 705                 return;
 706         can_msgobj_set_fl(obj,TX_PENDING);
 707
 708         if (chip->chipspecops->pre_write_config(chip, obj, &obj->tx_slot->msg)) {
 709                 obj->ret = -1;
 710                 canque_notify_inends(obj->tx_qedge, CANQUEUE_NOTIFY_ERRTX_PREP);
 711                 canque_free_outslot(obj->qends, obj->tx_qedge, obj->tx_slot);
 712                 obj->tx_slot=NULL;
 713                 return;
 714         }
 715         if (chip->chipspecops->send_msg(chip, obj, &obj->tx_slot->msg)) {
 716                 obj->ret = -1;
 717                 canque_notify_inends(obj->tx_qedge, CANQUEUE_NOTIFY_ERRTX_SEND);
 718                 canque_free_outslot(obj->qends, obj->tx_qedge, obj->tx_slot);
 719                 obj->tx_slot=NULL;
 720                 return;
 721         }
 722 }
 723
 724 #define MAX_RETR 10
 725
 726 /**
 727  * usbcan_irq_handler: - interrupt service routine
 728  * @irq: interrupt vector number, this value is system specific
 729  * @chip: pointer to chip state structure
 730  *
 731  * Interrupt handler is activated when state of CAN controller chip changes,
 732  * there is message to be read or there is more space for new messages or
 733  * error occurs. The receive events results in reading of the message from
 734  * CAN controller chip and distribution of message through attached
 735  * message queues.
 736  * File: src/usbcan.c
 737  */
 738 int usbcan_irq_handler(int irq, struct canchip_t *chip)
 739 {
 740 /*      int irq_register, status, error_code;
 741         struct msgobj_t *obj=chip->msgobj[0];
 742         int loop_cnt=CHIP_MAX_IRQLOOP;
 743
 744         irq_register=can_read_reg(chip,SJAIR);
 745 //      DEBUGMSG("sja1000_irq_handler: SJAIR:%02x\n",irq_register);
 746 //      DEBUGMSG("sja1000_irq_handler: SJASR:%02x\n",
 747 //                                      can_read_reg(chip,SJASR));
 748
 749         if ((irq_register & (sjaIR_BEI|sjaIR_EPI|sjaIR_DOI|sjaIR_EI|sjaIR_TI|sjaIR_RI)) == 0)
 750                 return CANCHIP_IRQ_NONE;
 751
 752         if(!(chip->flags&CHIP_CONFIGURED)) {
 753                 CANMSG("usbcan_irq_handler: called for non-configured device, irq_register 0x%02x\n", irq_register);
 754                 return CANCHIP_IRQ_NONE;
 755         }
 756
 757         status=can_read_reg(chip,SJASR);
 758
 759         do {
 760
 761                 if(!loop_cnt--) {
 762                         CANMSG("usbcan_irq_handler IRQ %d stuck\n",irq);
 763                         return CANCHIP_IRQ_STUCK;
 764                 }
 765
 766                 // (irq_register & sjaIR_TI)
 767                 //      old variant using SJAIR, collides with intended use with irq_accept
 768                 if (((status & sjaSR_TBS) && can_msgobj_test_fl(obj,TX_PENDING))||
 769                     (can_msgobj_test_fl(obj,TX_REQUEST))) {
 770                         DEBUGMSG("sja1000_irq_handler: TI or TX_PENDING and TBS\n");
 771                         obj->ret = 0;
 772                         can_msgobj_set_fl(obj,TX_REQUEST);
 773                         while(!can_msgobj_test_and_set_fl(obj,TX_LOCK)){
 774                                 can_msgobj_clear_fl(obj,TX_REQUEST);
 775
 776                                 if (can_read_reg(chip, SJASR) & sjaSR_TBS)
 777                                         usbcan_irq_write_handler(chip, obj);
 778
 779                                 can_msgobj_clear_fl(obj,TX_LOCK);
 780                                 if(!can_msgobj_test_fl(obj,TX_REQUEST)) break;
 781                                 DEBUGMSG("TX looping in sja1000_irq_handler\n");
 782                         }
 783                 }
 784                 if ((irq_register & (sjaIR_EI|sjaIR_BEI|sjaIR_EPI|sjaIR_DOI)) != 0) {
 785                         // Some error happened
 786                         error_code=can_read_reg(chip,SJAECC);
 787                         sja1000_report_error(chip, status, irq_register, error_code);
 788 // FIXME: chip should be brought to usable state. Transmission cancelled if in progress.
 789 // Reset flag set to 0 if chip is already off the bus. Full state report
 790                         obj->ret=-1;
 791
 792                         if(error_code == 0xd9) {
 793                                 obj->ret= -ENXIO;
 794                                 // no such device or address - no ACK received
 795                         }
 796                         if(obj->tx_retry_cnt++>MAX_RETR) {
 797                                 can_write_reg(chip, sjaCMR_AT, SJACMR); // cancel any transmition
 798                                 obj->tx_retry_cnt = 0;
 799                         }
 800                         if(status&sjaSR_BS) {
 801                                 CANMSG("bus-off, resetting usbcan\n");
 802                                 can_write_reg(chip, 0, SJAMOD);
 803                         }
 804
 805                         if(obj->tx_slot){
 806                                 canque_notify_inends(obj->tx_qedge, CANQUEUE_NOTIFY_ERRTX_BUS);
 807                                 //canque_free_outslot(obj->qends, obj->tx_qedge, obj->tx_slot);
 808                                 //obj->tx_slot=NULL;
 809                         }
 810
 811                 } else {
 812                         if(sja1000_report_error_limit_counter)
 813                                 sja1000_report_error_limit_counter--;
 814                         obj->tx_retry_cnt=0;
 815                 }
 816
 817                 irq_register=can_read_reg(chip,SJAIR);
 818
 819                 status=can_read_reg(chip,SJASR);
 820
 821                 if(((status & sjaSR_TBS) && can_msgobj_test_fl(obj,TX_PENDING)) ||
 822                    (irq_register & sjaIR_TI))
 823                          can_msgobj_set_fl(obj,TX_REQUEST);
 824
 825         } while((irq_register & (sjaIR_BEI|sjaIR_EPI|sjaIR_DOI|sjaIR_EI|sjaIR_RI)) ||
 826                 (can_msgobj_test_fl(obj,TX_REQUEST) && !can_msgobj_test_fl(obj,TX_LOCK)) ||
 827                 (status & sjaSR_RBS));
 828 */
 829         return CANCHIP_IRQ_HANDLED;
 830 }
 831
 832 /**
 833  * usbcan_wakeup_tx: - wakeups TX processing
 834  * @chip: pointer to chip state structure
 835  * @obj: pointer to message object structure
 836  *
 837  * Function is responsible for initiating message transmition.
 838  * It is responsible for clearing of object TX_REQUEST flag
 839  *
 840  * Return Value: negative value reports error.
 841  * File: src/usbcan.c
 842  */
 843 int usbcan_wakeup_tx(struct canchip_t *chip, struct msgobj_t *obj)
 844 {
 845
 846         can_preempt_disable();
 847
 848         can_msgobj_set_fl(obj,TX_PENDING);
 849         can_msgobj_set_fl(obj,TX_REQUEST);
 850         while(!can_msgobj_test_and_set_fl(obj,TX_LOCK)){
 851                 can_msgobj_clear_fl(obj,TX_REQUEST);
 852
 853                 if (!usbcan_chip_queue_status(chip)){
 854                         obj->tx_retry_cnt=0;
 855                         usbcan_irq_write_handler(chip, obj);
 856                 }
 857
 858                 can_msgobj_clear_fl(obj,TX_LOCK);
 859                 if(!can_msgobj_test_fl(obj,TX_REQUEST)) break;
 860                 DEBUGMSG("TX looping in usbcan_wakeup_tx\n");
 861         }
 862
 863         can_preempt_enable();
 864         return 0;
 865 }
 866
 867 int usbcan_chipregister(struct chipspecops_t *chipspecops)
 868 {
 869         CANMSG("initializing usbcan chip operations\n");
 870         chipspecops->chip_config=usbcan_chip_config;
 871         chipspecops->baud_rate=usbcan_baud_rate;
 872         chipspecops->standard_mask=usbcan_standard_mask;
 873         chipspecops->extended_mask=usbcan_extended_mask;
 874         chipspecops->message15_mask=usbcan_extended_mask;
 875         chipspecops->clear_objects=usbcan_clear_objects;
 876         chipspecops->config_irqs=usbcan_config_irqs;
 877         chipspecops->pre_read_config=usbcan_pre_read_config;
 878         chipspecops->pre_write_config=usbcan_pre_write_config;
 879         chipspecops->send_msg=usbcan_send_msg;
 880         chipspecops->check_tx_stat=usbcan_check_tx_stat;
 881         chipspecops->wakeup_tx=usbcan_wakeup_tx;
 882         chipspecops->remote_request=usbcan_remote_request;
 883         chipspecops->enable_configuration=usbcan_enable_configuration;
 884         chipspecops->disable_configuration=usbcan_disable_configuration;
 885         chipspecops->attach_to_chip=usbcan_attach_to_chip;
 886         chipspecops->release_chip=usbcan_release_chip;
 887         chipspecops->set_btregs=usbcan_set_btregs;
 888         chipspecops->start_chip=usbcan_start_chip;
 889         chipspecops->stop_chip=usbcan_stop_chip;
 890         chipspecops->irq_handler=usbcan_irq_handler;
 891         chipspecops->irq_accept=NULL;
 892         return 0;
 893 }
 894
 895 /**
 896  * usbcan_fill_chipspecops - fills chip specific operations
 897  * @chip: pointer to chip representation structure
 898  *
 899  * The function fills chip specific operations for sja1000 (PeliCAN) chip.
 900  *
 901  * Return Value: returns negative number in the case of fail
 902  */
 903 int usbcan_fill_chipspecops(struct canchip_t *chip)
 904 {
 905         chip->chip_type="usbcan";
 906         chip->max_objects=1;
 907         usbcan_chipregister(chip->chipspecops);
 908         return 0;
 909 }
 910
 911 /**
 912  * usbcan_init_chip_data - Initialize chips
 913  * @candev: Pointer to candevice/board structure
 914  * @chipnr: Number of the CAN chip on the hardware card
 915  *
 916  * The function usbcan_init_chip_data() is used to initialize the hardware
 917  * structure containing information about the CAN chips.
 918  * %CHIP_TYPE represents the type of CAN chip. %CHIP_TYPE can be "i82527" or
 919  * "sja1000".
 920  * The @chip_base_addr entry represents the start of the 'official' memory map
 921  * of the installed chip. It's likely that this is the same as the @io_addr
 922  * argument supplied at module loading time.
 923  * The @clock entry holds the chip clock value in Hz.
 924  * The entry @sja_cdr_reg holds hardware specific options for the Clock Divider
 925  * register. Options defined in the %sja1000.h file:
 926  * %sjaCDR_CLKOUT_MASK, %sjaCDR_CLK_OFF, %sjaCDR_RXINPEN, %sjaCDR_CBP, %sjaCDR_PELICAN
 927  * The entry @sja_ocr_reg holds hardware specific options for the Output Control
 928  * register. Options defined in the %sja1000.h file:
 929  * %sjaOCR_MODE_BIPHASE, %sjaOCR_MODE_TEST, %sjaOCR_MODE_NORMAL, %sjaOCR_MODE_CLOCK,
 930  * %sjaOCR_TX0_LH, %sjaOCR_TX1_ZZ.
 931  * The entry @int_clk_reg holds hardware specific options for the Clock Out
 932  * register. Options defined in the %i82527.h file:
 933  * %iCLK_CD0, %iCLK_CD1, %iCLK_CD2, %iCLK_CD3, %iCLK_SL0, %iCLK_SL1.
 934  * The entry @int_bus_reg holds hardware specific options for the Bus
 935  * Configuration register. Options defined in the %i82527.h file:
 936  * %iBUS_DR0, %iBUS_DR1, %iBUS_DT1, %iBUS_POL, %iBUS_CBY.
 937  * The entry @int_cpu_reg holds hardware specific options for the cpu interface
 938  * register. Options defined in the %i82527.h file:
 939  * %iCPU_CEN, %iCPU_MUX, %iCPU_SLP, %iCPU_PWD, %iCPU_DMC, %iCPU_DSC, %iCPU_RST.
 940  * Return Value: The function always returns zero
 941  * File: src/usbcan.c
 942  */
 943 int usbcan_init_chip_data(struct candevice_t *candev, int chipnr)
 944 {
 945         struct canchip_t *chip=candev->chip[chipnr];
 946
 947         usbcan_fill_chipspecops(chip);
 948
 949         candev->chip[chipnr]->flags|=CHIP_IRQ_CUSTOM;
 950         candev->chip[chipnr]->chip_base_addr=0;
 951         candev->chip[chipnr]->clock = 0;
 952
 953         return 0;
 954 }
 955
 956
 957
 958 /* --------------------------------------------------------------------------------------------------- */
 959
 960 static void usbcan_rcv(struct urb *urb)
 961 {
 962         struct usbcan_usb *dev = urb->context;
 963         int retval;
 964
 965         switch (urb->status) {
 966         case 0:
 967                 /* success */
 968                 set_bit(USBCAN_DATA_READ,&dev->flags);
 969                 wake_up(&dev->rcvthread.queue);
 970                 return;
 971         case -ECONNRESET:
 972         case -ENOENT:
 973         case -ESHUTDOWN:
 974                 /* this urb is terminated, clean up */
 975                 CANMSG("%s - urb shutting down with status: %d\n", __FUNCTION__, urb->status);
 976                 set_bit(USBCAN_TERMINATE,&dev->flags);
 977                 wake_up(&dev->rcvthread.queue);
 978                 return;
 979         default:
 980                 CANMSG("%s - nonzero urb status received: %d\n", __FUNCTION__, urb->status);
 981                 break;
 982         }
 983
 984         retval = usb_submit_urb (urb, GFP_ATOMIC);
 985         if (retval<0){
 986                 CANMSG("%s - usb_submit_urb failed with result %d\n",
 987                      __FUNCTION__, retval);
 988                 set_bit(USBCAN_ERROR,&dev->flags);
 989                 wake_up(&dev->rcvthread.queue);
 990         }
 991 }
 992
 993 void usbcan_read_kthread(kthread_t *kthread)
 994 {
 995         int retval;
 996         struct usbcan_usb *dev=(struct usbcan_usb *)kthread->arg;
 997         struct msgobj_t *obj;
 998
 999   /* setup the thread environment */
1000   init_kthread(kthread, "usbcan");
1001
1002   /* this is normal work to do */
1003   CANMSG ("usbcan thread started!\n");
1004
1005         dev->rcv = usb_alloc_urb(0, GFP_KERNEL);
1006         if (!dev->rcv){
1007                 CANMSG("Error allocating usb urb\n");
1008                 goto error;
1009         }
1010         dev->rcv->dev = dev->udev;
1011         usb_fill_bulk_urb(dev->rcv, dev->udev,
1012                          usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
1013                          &dev->rcv_msg, 16,
1014                          usbcan_rcv, dev);
1015
1016   /* an endless loop in which we are doing our work */
1017   for(;;)
1018   {
1019                 retval=usb_submit_urb(dev->rcv, GFP_KERNEL);
1020                 if (retval){
1021                         CANMSG("URB error %d\n",retval);
1022                         break;
1023                 }
1024                 /* fall asleep */
1025                 wait_event_interruptible(kthread->queue,
1026                         test_bit(USBCAN_DATA_READ,&dev->flags)
1027                         || test_bit(USBCAN_TERMINATE,&dev->flags)
1028                         || test_bit(USBCAN_ERROR,&dev->flags)
1029                 );
1030
1031                 /* We need to do a memory barrier here to be sure that
1032                 the flags are visible on all CPUs. */
1033                 mb();
1034
1035                 /* here we are back from sleep because we caught a signal. */
1036                 if (kthread->terminate)
1037                 {
1038                         /* we received a request to terminate ourself */
1039                         break;
1040                 }
1041
1042                 if (test_bit(USBCAN_ERROR,&dev->flags)){
1043                         CANMSG("URB error %d\n",retval);
1044                         break;
1045                 }
1046
1047                 { /* Normal work to do */
1048                         if (test_bit(USBCAN_DATA_READ,&dev->flags)){
1049                                 int i, len;
1050                                 clear_bit(USBCAN_DATA_READ,&dev->flags);
1051
1052                                 if ((dev->candev->chip[dev->rcv_msg[0]])&&
1053                                         (dev->candev->chip[dev->rcv_msg[0]]->flags & CHIP_CONFIGURED)
1054                                 ){
1055                                         __u8 *ptr;
1056
1057                                         obj=dev->candev->chip[dev->rcv_msg[0]]->msgobj[0];
1058
1059                                         len=*(uint8_t *)(dev->rcv_msg+1);
1060                                         if(len > CAN_MSG_LENGTH) len = CAN_MSG_LENGTH;
1061                                         obj->rx_msg.length = len;
1062
1063                                         obj->rx_msg.flags=le16_to_cpu(*(uint16_t *)(dev->rcv_msg+2));
1064                                         obj->rx_msg.id=le32_to_cpu((*(uint32_t *)(dev->rcv_msg+4)));
1065
1066                                         for(ptr=dev->rcv_msg+8,i=0; i < len; ptr++,i++) {
1067                                                 obj->rx_msg.data[i]=*ptr;
1068                                         }
1069
1070                                         // fill CAN message timestamp
1071                                         can_filltimestamp(&obj->rx_msg.timestamp);
1072                                         canque_filter_msg2edges(obj->qends, &obj->rx_msg);
1073                                 }
1074                         }
1075     }
1076   }
1077   /* here we go only in case of termination of the thread */
1078 error:
1079   /* cleanup the thread, leave */
1080   CANMSG ("kernel thread terminated!\n");
1081   exit_kthread(kthread);
1082
1083   /* returning from the thread here calls the exit functions */
1084 }
1085
1086 static int usbcan_probe(struct usb_interface *interface, const struct usb_device_id *id)
1087 {
1088         struct usbcan_usb *dev;
1089         struct usb_host_interface *iface_desc;
1090         struct usb_endpoint_descriptor *endpoint;
1091         size_t buffer_size;
1092         int i;
1093         int retval = -ENOMEM;
1094
1095         /* allocate memory for our device state and initialize it */
1096         dev = (struct usbcan_usb *) can_checked_malloc(sizeof(struct usbcan_usb));
1097         if (!dev) {
1098                 err("Out of memory");
1099                 goto error;
1100         }
1101
1102         sema_init(&dev->limit_sem, WRITES_IN_FLIGHT);
1103         spin_lock_init(&dev->err_lock);
1104         init_usb_anchor(&dev->submitted);
1105
1106 //      dev->udev = usb_get_dev(interface_to_usbdev(interface));
1107         dev->udev = interface_to_usbdev(interface);
1108         dev->interface = interface;
1109
1110         /* set up the endpoint information */
1111         /* use only the first bulk-in and bulk-out endpoints */
1112         iface_desc = interface->cur_altsetting;
1113         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1114                 endpoint = &iface_desc->endpoint[i].desc;
1115
1116                 if (!dev->bulk_in_endpointAddr &&
1117                     usb_endpoint_is_bulk_in(endpoint)) {
1118                         /* we found a bulk in endpoint */
1119                         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
1120                         dev->bulk_in_size = buffer_size;
1121                         dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
1122                         dev->bulk_in_buffer = can_checked_malloc(buffer_size);
1123                         if (!dev->bulk_in_buffer) {
1124                                 err("Could not allocate bulk_in_buffer");
1125                                 goto error;
1126                         }
1127                 }
1128
1129                 if (!dev->bulk_out_endpointAddr &&
1130                     usb_endpoint_is_bulk_out(endpoint)) {
1131                         /* we found a bulk out endpoint */
1132                                 dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
1133                 }
1134
1135                 if (!dev->ctl_in_endpointAddr &&
1136                     usb_endpoint_xfer_control(endpoint) &&
1137                     usb_endpoint_dir_in(endpoint)) {
1138                         /* we found a bulk in endpoint */
1139                         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
1140                         dev->ctl_in_size = buffer_size;
1141                         dev->ctl_in_endpointAddr = endpoint->bEndpointAddress;
1142                         dev->ctl_in_buffer = can_checked_malloc(buffer_size);
1143                         if (!dev->ctl_in_buffer) {
1144                                 err("Could not allocate bulk_in_buffer");
1145                                 goto error;
1146                         }
1147                 }
1148
1149                 if (!dev->ctl_out_endpointAddr &&
1150                     usb_endpoint_xfer_control(endpoint) &&
1151                     usb_endpoint_dir_out(endpoint)) {
1152                         /* we found a bulk out endpoint */
1153                                 dev->ctl_out_endpointAddr = endpoint->bEndpointAddress;
1154                 }
1155         }
1156         if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
1157                 err("Could not find all bulk-in and bulk-out endpoints");
1158                 goto error;
1159         }
1160
1161         /* save our data pointer in this interface device */
1162         usb_set_intfdata(interface, dev);
1163
1164         register_usbdev("usbcan",(void *) dev);
1165
1166         /* let the user know what node this device is now attached to */
1167         info("USB Skeleton device now attached");
1168         return 0;
1169
1170 error:
1171         usb_put_dev(dev->udev);
1172         if (dev->bulk_in_buffer)
1173                 can_checked_free(dev->bulk_in_buffer);
1174         if (dev->ctl_in_buffer)
1175                 can_checked_free(dev->ctl_in_buffer);
1176         if (dev->candev){
1177                 dev->candev->sysdevptr.anydev=NULL;
1178                 cleanup_usbdev(dev->candev);
1179         }
1180         can_checked_free(dev);
1181         return retval;
1182 }
1183
1184 // Physically disconnected device
1185 static void usbcan_disconnect(struct usb_interface *interface)
1186 {
1187         struct usbcan_usb *dev;
1188         int minor = interface->minor;
1189
1190         dev = usb_get_intfdata(interface);
1191         usb_set_intfdata(interface, NULL);
1192
1193         /* prevent more I/O from starting */
1194         mutex_lock(&dev->io_mutex);
1195         dev->interface = NULL;
1196         mutex_unlock(&dev->io_mutex);
1197
1198         //usb_kill_anchored_urbs(&dev->submitted);
1199
1200         usb_put_dev(dev->udev);
1201         if (dev->bulk_in_buffer)
1202                 can_checked_free(dev->bulk_in_buffer);
1203         if (dev->ctl_in_buffer)
1204                 can_checked_free(dev->ctl_in_buffer);
1205         if (dev->candev){
1206                 dev->candev->sysdevptr.anydev=NULL;
1207                 cleanup_usbdev(dev->candev);
1208         }
1209         can_checked_free(dev);
1210
1211         info("USB Skeleton now disconnected");
1212 }
1213
1214 int usbcan_init(void){
1215         return usb_register(&usbcan_driver);
1216 }
1217
1218 void usbcan_exit(void){
1219         usb_deregister(&usbcan_driver);
1220 }