drivers/media/dvb/b2c2/flexcop-usb.c

   1 /*
   2  * This file is part of linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III
   3  *
   4  * flexcop-usb.c - covers the USB part.
   5  *
   6  * see flexcop.c for copyright information.
   7  */
   8
   9 #define FC_LOG_PREFIX "flexcop_usb"
  10 #include "flexcop-usb.h"
  11 #include "flexcop-common.h"
  12
  13 /* Version information */
  14 #define DRIVER_VERSION "0.1"
  15 #define DRIVER_NAME "Technisat/B2C2 FlexCop II/IIb/III Digital TV USB Driver"
  16 #define DRIVER_AUTHOR "Patrick Boettcher <patrick.boettcher@desy.de>"
  17
  18 /* debug */
  19 #ifdef CONFIG_DVB_B2C2_FLEXCOP_DEBUG
  20 #define dprintk(level,args...) \
  21             do { if ((debug & level)) { printk(args); } } while (0)
  22 #define debug_dump(b,l,method) {\
  23         int i; \
  24         for (i = 0; i < l; i++) method("%02x ", b[i]); \
  25         method("\n");\
  26 }
  27
  28 #define DEBSTATUS ""
  29 #else
  30 #define dprintk(level,args...)
  31 #define debug_dump(b,l,method)
  32 #define DEBSTATUS " (debugging is not enabled)"
  33 #endif
  34
  35 static int debug;
  36 module_param(debug, int, 0644);
  37 MODULE_PARM_DESC(debug, "set debugging level (1=info,ts=2,ctrl=4,i2c=8,v8mem=16 (or-able))." DEBSTATUS);
  38 #undef DEBSTATUS
  39
  40 #define deb_info(args...) dprintk(0x01,args)
  41 #define deb_ts(args...)   dprintk(0x02,args)
  42 #define deb_ctrl(args...) dprintk(0x04,args)
  43 #define deb_i2c(args...)  dprintk(0x08,args)
  44 #define deb_v8(args...)   dprintk(0x10,args)
  45
  46 /* JLP 111700: we will include the 1 bit gap between the upper and lower 3 bits
  47  * in the IBI address, to make the V8 code simpler.
  48  * PCI ADDRESS FORMAT: 0x71C -> 0000 0111 0001 1100 (these are the six bits used)
  49  *                  in general: 0000 0HHH 000L LL00
  50  * IBI ADDRESS FORMAT:                    RHHH BLLL
  51  *
  52  * where R is the read(1)/write(0) bit, B is the busy bit
  53  * and HHH and LLL are the two sets of three bits from the PCI address.
  54  */
  55 #define B2C2_FLEX_PCIOFFSET_TO_INTERNALADDR(usPCI) (u8) (((usPCI >> 2) & 0x07) + ((usPCI >> 4) & 0x70))
  56 #define B2C2_FLEX_INTERNALADDR_TO_PCIOFFSET(ucAddr) (u16) (((ucAddr & 0x07) << 2) + ((ucAddr & 0x70) << 4))
  57
  58 /*
  59  * DKT 020228
  60  * - forget about this VENDOR_BUFFER_SIZE, read and write register
  61  *   deal with DWORD or 4 bytes, that should be should from now on
  62  * - from now on, we don't support anything older than firm 1.00
  63  *   I eliminated the write register as a 2 trip of writing hi word and lo word
  64  *   and force this to write only 4 bytes at a time.
  65  *   NOTE: this should work with all the firmware from 1.00 and newer
  66  */
  67 static int flexcop_usb_readwrite_dw(struct flexcop_device *fc, u16 wRegOffsPCI, u32 *val, u8 read)
  68 {
  69         struct flexcop_usb *fc_usb = fc->bus_specific;
  70         u8 request = read ? B2C2_USB_READ_REG : B2C2_USB_WRITE_REG;
  71         u8 request_type = (read ? USB_DIR_IN : USB_DIR_OUT) | USB_TYPE_VENDOR;
  72         u8 wAddress = B2C2_FLEX_PCIOFFSET_TO_INTERNALADDR(wRegOffsPCI) | (read ? 0x80 : 0);
  73
  74         int len = usb_control_msg(fc_usb->udev,
  75                         read ? B2C2_USB_CTRL_PIPE_IN : B2C2_USB_CTRL_PIPE_OUT,
  76                         request,
  77                         request_type,  /* 0xc0 read or 0x40 write*/
  78                         wAddress,
  79                         0,
  80                         val,
  81                         sizeof(u32),
  82                         B2C2_WAIT_FOR_OPERATION_RDW * HZ);
  83
  84         if (len != sizeof(u32)) {
  85                 err("error while %s dword from %d (%d).",read ? "reading" : "writing",
  86                         wAddress,wRegOffsPCI);
  87                 return -EIO;
  88         }
  89         return 0;
  90 }
  91
  92 /*
  93  * DKT 010817 - add support for V8 memory read/write and flash update
  94  */
  95 static int flexcop_usb_v8_memory_req(struct flexcop_usb *fc_usb,
  96                 flexcop_usb_request_t req, u8 page, u16 wAddress,
  97                 u8 *pbBuffer,u32 buflen)
  98 {
  99 //      u8 dwRequestType;
 100         u8 request_type = USB_TYPE_VENDOR;
 101         u16 wIndex;
 102         int nWaitTime,pipe,len;
 103
 104         wIndex = page << 8;
 105
 106         switch (req) {
 107                 case B2C2_USB_READ_V8_MEM:
 108                         nWaitTime = B2C2_WAIT_FOR_OPERATION_V8READ;
 109                         request_type |= USB_DIR_IN;
 110 //                      dwRequestType = (u8) RTYPE_READ_V8_MEMORY;
 111                         pipe = B2C2_USB_CTRL_PIPE_IN;
 112                 break;
 113                 case B2C2_USB_WRITE_V8_MEM:
 114                         wIndex |= pbBuffer[0];
 115                         request_type |= USB_DIR_OUT;
 116                         nWaitTime = B2C2_WAIT_FOR_OPERATION_V8WRITE;
 117 //                      dwRequestType = (u8) RTYPE_WRITE_V8_MEMORY;
 118                         pipe = B2C2_USB_CTRL_PIPE_OUT;
 119                 break;
 120                 case B2C2_USB_FLASH_BLOCK:
 121                         request_type |= USB_DIR_OUT;
 122                         nWaitTime = B2C2_WAIT_FOR_OPERATION_V8FLASH;
 123 //                      dwRequestType = (u8) RTYPE_WRITE_V8_FLASH;
 124                         pipe = B2C2_USB_CTRL_PIPE_OUT;
 125                 break;
 126                 default:
 127                         deb_info("unsupported request for v8_mem_req %x.\n",req);
 128                 return -EINVAL;
 129         }
 130         deb_v8("v8mem: %02x %02x %04x %04x, len: %d\n",request_type,req,
 131                         wAddress,wIndex,buflen);
 132
 133         len = usb_control_msg(fc_usb->udev,pipe,
 134                         req,
 135                         request_type,
 136                         wAddress,
 137                         wIndex,
 138                         pbBuffer,
 139                         buflen,
 140                         nWaitTime * HZ);
 141
 142         debug_dump(pbBuffer,len,deb_v8);
 143
 144         return len == buflen ? 0 : -EIO;
 145 }
 146
 147 #define bytes_left_to_read_on_page(paddr,buflen) \
 148                         ((V8_MEMORY_PAGE_SIZE - (paddr & V8_MEMORY_PAGE_MASK)) > buflen \
 149                         ? buflen : (V8_MEMORY_PAGE_SIZE - (paddr & V8_MEMORY_PAGE_MASK)))
 150
 151 static int flexcop_usb_memory_req(struct flexcop_usb *fc_usb,flexcop_usb_request_t req,
 152                 flexcop_usb_mem_page_t page_start, u32 addr, int extended, u8 *buf, u32 len)
 153 {
 154         int i,ret = 0;
 155         u16 wMax;
 156         u32 pagechunk = 0;
 157
 158         switch(req) {
 159                 case B2C2_USB_READ_V8_MEM:  wMax = USB_MEM_READ_MAX; break;
 160                 case B2C2_USB_WRITE_V8_MEM:     wMax = USB_MEM_WRITE_MAX; break;
 161                 case B2C2_USB_FLASH_BLOCK:  wMax = USB_FLASH_MAX; break;
 162                 default:
 163                         return -EINVAL;
 164                 break;
 165         }
 166         for (i = 0; i < len;) {
 167                 pagechunk = wMax < bytes_left_to_read_on_page(addr,len) ? wMax : bytes_left_to_read_on_page(addr,len);
 168                 deb_info("%x\n",(addr & V8_MEMORY_PAGE_MASK) | (V8_MEMORY_EXTENDED*extended));
 169                 if ((ret = flexcop_usb_v8_memory_req(fc_usb,req,
 170                                 page_start + (addr / V8_MEMORY_PAGE_SIZE), /* actual page */
 171                                 (addr & V8_MEMORY_PAGE_MASK) | (V8_MEMORY_EXTENDED*extended),
 172                                 &buf[i],pagechunk)) < 0)
 173                         return ret;
 174
 175                 addr += pagechunk;
 176                 len -= pagechunk;
 177         }
 178         return 0;
 179 }
 180
 181 static int flexcop_usb_get_mac_addr(struct flexcop_device *fc, int extended)
 182 {
 183         return flexcop_usb_memory_req(fc->bus_specific,B2C2_USB_READ_V8_MEM,V8_MEMORY_PAGE_FLASH,0x1f010,1,fc->mac_address,6);
 184 }
 185
 186 #if 0
 187 static int flexcop_usb_utility_req(struct flexcop_usb *fc_usb, int set,
 188                 flexcop_usb_utility_function_t func, u8 extra, u16 wIndex,
 189                 u16 buflen, u8 *pvBuffer)
 190 {
 191         u16 wValue;
 192         u8 request_type = (set ? USB_DIR_OUT : USB_DIR_IN) | USB_TYPE_VENDOR;
 193 //      u8 dwRequestType = (u8) RTYPE_GENERIC,
 194         int nWaitTime = 2,
 195                 pipe = set ? B2C2_USB_CTRL_PIPE_OUT : B2C2_USB_CTRL_PIPE_IN,
 196                 len;
 197
 198         wValue = (func << 8) | extra;
 199
 200         len = usb_control_msg(fc_usb->udev,pipe,
 201                         B2C2_USB_UTILITY,
 202                         request_type,
 203                         wValue,
 204                         wIndex,
 205                         pvBuffer,
 206                         buflen,
 207                         nWaitTime * HZ);
 208         return len == buflen ? 0 : -EIO;
 209 }
 210 #endif
 211
 212 /* usb i2c stuff */
 213 static int flexcop_usb_i2c_req(struct flexcop_usb *fc_usb,
 214                 flexcop_usb_request_t req, flexcop_usb_i2c_function_t func,
 215                 flexcop_i2c_port_t port, u8 chipaddr, u8 addr, u8 *buf, u8 buflen)
 216 {
 217         u16 wValue, wIndex;
 218         int nWaitTime,pipe,len;
 219 //      u8 dwRequestType;
 220         u8 request_type = USB_TYPE_VENDOR;
 221
 222         switch (func) {
 223                 case USB_FUNC_I2C_WRITE:
 224                 case USB_FUNC_I2C_MULTIWRITE:
 225                 case USB_FUNC_I2C_REPEATWRITE:
 226                 /* DKT 020208 - add this to support special case of DiSEqC */
 227                 case USB_FUNC_I2C_CHECKWRITE:
 228                         pipe = B2C2_USB_CTRL_PIPE_OUT;
 229                         nWaitTime = 2;
 230 //                      dwRequestType = (u8) RTYPE_GENERIC;
 231                         request_type |= USB_DIR_OUT;
 232                 break;
 233                 case USB_FUNC_I2C_READ:
 234                 case USB_FUNC_I2C_REPEATREAD:
 235                         pipe = B2C2_USB_CTRL_PIPE_IN;
 236                         nWaitTime = 2;
 237 //                      dwRequestType = (u8) RTYPE_GENERIC;
 238                         request_type |= USB_DIR_IN;
 239                 break;
 240                 default:
 241                         deb_info("unsupported function for i2c_req %x\n",func);
 242                         return -EINVAL;
 243         }
 244         wValue = (func << 8 ) | (port << 4);
 245         wIndex = (chipaddr << 8 ) | addr;
 246
 247         deb_i2c("i2c %2d: %02x %02x %02x %02x %02x %02x\n",func,request_type,req,
 248                         ((wValue && 0xff) << 8),wValue >> 8,((wIndex && 0xff) << 8),wIndex >> 8);
 249
 250         len = usb_control_msg(fc_usb->udev,pipe,
 251                         req,
 252                         request_type,
 253                         wValue,
 254                         wIndex,
 255                         buf,
 256                         buflen,
 257                         nWaitTime * HZ);
 258
 259         return len == buflen ? 0 : -EREMOTEIO;
 260 }
 261
 262 /* actual bus specific access functions, make sure prototype are/will be equal to pci */
 263 static flexcop_ibi_value flexcop_usb_read_ibi_reg(struct flexcop_device *fc, flexcop_ibi_register reg)
 264 {
 265         flexcop_ibi_value val;
 266         val.raw = 0;
 267         flexcop_usb_readwrite_dw(fc,reg, &val.raw, 1);
 268         return val;
 269 }
 270
 271 static int flexcop_usb_write_ibi_reg(struct flexcop_device *fc, flexcop_ibi_register reg, flexcop_ibi_value val)
 272 {
 273         return flexcop_usb_readwrite_dw(fc,reg, &val.raw, 0);
 274 }
 275
 276 static int flexcop_usb_i2c_request(struct flexcop_device *fc, flexcop_access_op_t op,
 277                 flexcop_i2c_port_t port, u8 chipaddr, u8 addr, u8 *buf, u16 len)
 278 {
 279         if (op == FC_READ)
 280                 return flexcop_usb_i2c_req(fc->bus_specific,B2C2_USB_I2C_REQUEST,USB_FUNC_I2C_READ,port,chipaddr,addr,buf,len);
 281         else
 282                 return flexcop_usb_i2c_req(fc->bus_specific,B2C2_USB_I2C_REQUEST,USB_FUNC_I2C_WRITE,port,chipaddr,addr,buf,len);
 283 }
 284
 285 static void flexcop_usb_urb_complete(struct urb *urb, struct pt_regs *ptregs)
 286 {
 287         struct flexcop_usb *fc_usb = urb->context;
 288         int i;
 289
 290         if (urb->actual_length > 0)
 291                 deb_ts("urb completed, bufsize: %d actlen; %d\n",urb->transfer_buffer_length, urb->actual_length);
 292
 293         for (i = 0; i < urb->number_of_packets; i++) {
 294                 if (urb->iso_frame_desc[i].status < 0) {
 295                         err("iso frame descriptor %d has an error: %d\n",i,urb->iso_frame_desc[i].status);
 296                 } else
 297                         if (urb->iso_frame_desc[i].actual_length > 0) {
 298                                 deb_ts("passed %d bytes to the demux\n",urb->iso_frame_desc[i].actual_length);
 299
 300                                 flexcop_pass_dmx_data(fc_usb->fc_dev,
 301                                         urb->transfer_buffer + urb->iso_frame_desc[i].offset,
 302                                         urb->iso_frame_desc[i].actual_length);
 303                 }
 304                 urb->iso_frame_desc[i].status = 0;
 305                 urb->iso_frame_desc[i].actual_length = 0;
 306         }
 307
 308         usb_submit_urb(urb,GFP_ATOMIC);
 309 }
 310
 311 static int flexcop_usb_stream_control(struct flexcop_device *fc, int onoff)
 312 {
 313         /* submit/kill iso packets */
 314         return 0;
 315 }
 316
 317 static void flexcop_usb_transfer_exit(struct flexcop_usb *fc_usb)
 318 {
 319         int i;
 320         for (i = 0; i < B2C2_USB_NUM_ISO_URB; i++)
 321                 if (fc_usb->iso_urb[i] != NULL) {
 322                         deb_ts("unlinking/killing urb no. %d\n",i);
 323                         usb_kill_urb(fc_usb->iso_urb[i]);
 324                         usb_free_urb(fc_usb->iso_urb[i]);
 325                 }
 326
 327         if (fc_usb->iso_buffer != NULL)
 328                 pci_free_consistent(NULL,fc_usb->buffer_size, fc_usb->iso_buffer, fc_usb->dma_addr);
 329 }
 330
 331 static int flexcop_usb_transfer_init(struct flexcop_usb *fc_usb)
 332 {
 333         u16 frame_size = fc_usb->uintf->cur_altsetting->endpoint[0].desc.wMaxPacketSize;
 334         int bufsize = B2C2_USB_NUM_ISO_URB * B2C2_USB_FRAMES_PER_ISO * frame_size,i,j,ret;
 335         int buffer_offset = 0;
 336
 337         deb_ts("creating %d iso-urbs with %d frames each of %d bytes size = %d.\n",
 338                         B2C2_USB_NUM_ISO_URB, B2C2_USB_FRAMES_PER_ISO, frame_size,bufsize);
 339
 340         fc_usb->iso_buffer = pci_alloc_consistent(NULL,bufsize,&fc_usb->dma_addr);
 341         if (fc_usb->iso_buffer == NULL)
 342                 return -ENOMEM;
 343         memset(fc_usb->iso_buffer, 0, bufsize);
 344         fc_usb->buffer_size = bufsize;
 345
 346         /* creating iso urbs */
 347         for (i = 0; i < B2C2_USB_NUM_ISO_URB; i++)
 348                 if (!(fc_usb->iso_urb[i] = usb_alloc_urb(B2C2_USB_FRAMES_PER_ISO,GFP_ATOMIC))) {
 349                         ret = -ENOMEM;
 350                         goto urb_error;
 351                 }
 352         /* initialising and submitting iso urbs */
 353         for (i = 0; i < B2C2_USB_NUM_ISO_URB; i++) {
 354                 int frame_offset = 0;
 355                 struct urb *urb = fc_usb->iso_urb[i];
 356                 deb_ts("initializing and submitting urb no. %d (buf_offset: %d).\n",i,buffer_offset);
 357
 358                 urb->dev = fc_usb->udev;
 359                 urb->context = fc_usb;
 360                 urb->complete = flexcop_usb_urb_complete;
 361                 urb->pipe = B2C2_USB_DATA_PIPE;
 362                 urb->transfer_flags = URB_ISO_ASAP;
 363                 urb->interval = 1;
 364                 urb->number_of_packets = B2C2_USB_FRAMES_PER_ISO;
 365                 urb->transfer_buffer_length = frame_size * B2C2_USB_FRAMES_PER_ISO;
 366                 urb->transfer_buffer = fc_usb->iso_buffer + buffer_offset;
 367
 368                 buffer_offset += frame_size * B2C2_USB_FRAMES_PER_ISO;
 369                 for (j = 0; j < B2C2_USB_FRAMES_PER_ISO; j++) {
 370                         deb_ts("urb no: %d, frame: %d, frame_offset: %d\n",i,j,frame_offset);
 371                         urb->iso_frame_desc[j].offset = frame_offset;
 372                         urb->iso_frame_desc[j].length = frame_size;
 373                         frame_offset += frame_size;
 374                 }
 375
 376                 if ((ret = usb_submit_urb(fc_usb->iso_urb[i],GFP_ATOMIC))) {
 377                         err("submitting urb %d failed with %d.",i,ret);
 378                         goto urb_error;
 379                 }
 380                 deb_ts("submitted urb no. %d.\n",i);
 381         }
 382
 383 /* SRAM */
 384
 385         flexcop_sram_set_dest(fc_usb->fc_dev,FC_SRAM_DEST_MEDIA | FC_SRAM_DEST_NET |
 386                         FC_SRAM_DEST_CAO | FC_SRAM_DEST_CAI, FC_SRAM_DEST_TARGET_WAN_USB);
 387         flexcop_wan_set_speed(fc_usb->fc_dev,FC_WAN_SPEED_8MBITS);
 388         flexcop_sram_ctrl(fc_usb->fc_dev,1,1,1);
 389
 390         ret = 0;
 391         goto success;
 392 urb_error:
 393         flexcop_usb_transfer_exit(fc_usb);
 394 success:
 395         return ret;
 396 }
 397
 398 static int flexcop_usb_init(struct flexcop_usb *fc_usb)
 399 {
 400         /* use the alternate setting with the larges buffer */
 401         usb_set_interface(fc_usb->udev,0,1);
 402         switch (fc_usb->udev->speed) {
 403                 case USB_SPEED_LOW:
 404                         err("cannot handle USB speed because it is to sLOW.");
 405                         return -ENODEV;
 406                         break;
 407                 case USB_SPEED_FULL:
 408                         info("running at FULL speed.");
 409                         break;
 410                 case USB_SPEED_HIGH:
 411                         info("running at HIGH speed.");
 412                         break;
 413                 case USB_SPEED_UNKNOWN: /* fall through */
 414                 default:
 415                         err("cannot handle USB speed because it is unkown.");
 416                         return -ENODEV;
 417         }
 418         usb_set_intfdata(fc_usb->uintf, fc_usb);
 419         return 0;
 420 }
 421
 422 static void flexcop_usb_exit(struct flexcop_usb *fc_usb)
 423 {
 424         usb_set_intfdata(fc_usb->uintf, NULL);
 425 }
 426
 427 static int flexcop_usb_probe(struct usb_interface *intf,
 428                 const struct usb_device_id *id)
 429 {
 430         struct usb_device *udev = interface_to_usbdev(intf);
 431         struct flexcop_usb *fc_usb = NULL;
 432         struct flexcop_device *fc = NULL;
 433         int ret;
 434
 435         if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_usb))) == NULL) {
 436                 err("out of memory\n");
 437                 return -ENOMEM;
 438         }
 439
 440 /* general flexcop init */
 441         fc_usb = fc->bus_specific;
 442         fc_usb->fc_dev = fc;
 443
 444         fc->read_ibi_reg  = flexcop_usb_read_ibi_reg;
 445         fc->write_ibi_reg = flexcop_usb_write_ibi_reg;
 446         fc->i2c_request = flexcop_usb_i2c_request;
 447         fc->get_mac_addr = flexcop_usb_get_mac_addr;
 448
 449         fc->stream_control = flexcop_usb_stream_control;
 450
 451         fc->pid_filtering = 1;
 452         fc->bus_type = FC_USB;
 453
 454         fc->dev = &udev->dev;
 455
 456 /* bus specific part */
 457         fc_usb->udev = udev;
 458         fc_usb->uintf = intf;
 459         if ((ret = flexcop_usb_init(fc_usb)) != 0)
 460                 goto err_kfree;
 461
 462 /* init flexcop */
 463         if ((ret = flexcop_device_initialize(fc)) != 0)
 464                 goto err_usb_exit;
 465
 466 /* xfer init */
 467         if ((ret = flexcop_usb_transfer_init(fc_usb)) != 0)
 468                 goto err_fc_exit;
 469
 470         info("%s successfully initialized and connected.",DRIVER_NAME);
 471         ret = 0;
 472         goto success;
 473 err_fc_exit:
 474         flexcop_device_exit(fc);
 475 err_usb_exit:
 476         flexcop_usb_exit(fc_usb);
 477 err_kfree:
 478         flexcop_device_kfree(fc);
 479 success:
 480         return ret;
 481 }
 482
 483 static void flexcop_usb_disconnect(struct usb_interface *intf)
 484 {
 485         struct flexcop_usb *fc_usb = usb_get_intfdata(intf);
 486         flexcop_usb_transfer_exit(fc_usb);
 487         flexcop_device_exit(fc_usb->fc_dev);
 488         flexcop_usb_exit(fc_usb);
 489         flexcop_device_kfree(fc_usb->fc_dev);
 490         info("%s successfully deinitialized and disconnected.",DRIVER_NAME);
 491 }
 492
 493 static struct usb_device_id flexcop_usb_table [] = {
 494             { USB_DEVICE(0x0af7, 0x0101) },
 495             { }
 496 };
 497
 498 /* usb specific object needed to register this driver with the usb subsystem */
 499 static struct usb_driver flexcop_usb_driver = {
 500         .owner          = THIS_MODULE,
 501         .name           = "Technisat/B2C2 FlexCop II/IIb/III USB",
 502         .probe          = flexcop_usb_probe,
 503         .disconnect = flexcop_usb_disconnect,
 504         .id_table       = flexcop_usb_table,
 505 };
 506
 507 /* module stuff */
 508 static int __init flexcop_usb_module_init(void)
 509 {
 510         int result;
 511         if ((result = usb_register(&flexcop_usb_driver))) {
 512                 err("usb_register failed. (%d)",result);
 513                 return result;
 514         }
 515
 516         return 0;
 517 }
 518
 519 static void __exit flexcop_usb_module_exit(void)
 520 {
 521         /* deregister this driver from the USB subsystem */
 522         usb_deregister(&flexcop_usb_driver);
 523 }
 524
 525 module_init(flexcop_usb_module_init);
 526 module_exit(flexcop_usb_module_exit);
 527
 528 MODULE_AUTHOR(DRIVER_AUTHOR);
 529 MODULE_DESCRIPTION(DRIVER_NAME);
 530 MODULE_LICENSE("GPL");