drivers/media/video/gspca/stk014.c

   1 /*
   2  * Syntek DV4000 (STK014) subdriver
   3  *
   4  * Copyright (C) 2008 Jean-Francois Moine (http://moinejf.free.fr)
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  */
  20
  21 #define MODULE_NAME "stk014"
  22
  23 #include "gspca.h"
  24 #include "jpeg.h"
  25
  26 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  27 MODULE_DESCRIPTION("Syntek DV4000 (STK014) USB Camera Driver");
  28 MODULE_LICENSE("GPL");
  29
  30 /* specific webcam descriptor */
  31 struct sd {
  32         struct gspca_dev gspca_dev;     /* !! must be the first item */
  33
  34         unsigned char brightness;
  35         unsigned char contrast;
  36         unsigned char colors;
  37         unsigned char lightfreq;
  38         u8 quality;
  39 #define QUALITY_MIN 70
  40 #define QUALITY_MAX 95
  41 #define QUALITY_DEF 88
  42
  43         u8 jpeg_hdr[JPEG_HDR_SZ];
  44 };
  45
  46 /* V4L2 controls supported by the driver */
  47 static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val);
  48 static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val);
  49 static int sd_setcontrast(struct gspca_dev *gspca_dev, __s32 val);
  50 static int sd_getcontrast(struct gspca_dev *gspca_dev, __s32 *val);
  51 static int sd_setcolors(struct gspca_dev *gspca_dev, __s32 val);
  52 static int sd_getcolors(struct gspca_dev *gspca_dev, __s32 *val);
  53 static int sd_setfreq(struct gspca_dev *gspca_dev, __s32 val);
  54 static int sd_getfreq(struct gspca_dev *gspca_dev, __s32 *val);
  55
  56 static const struct ctrl sd_ctrls[] = {
  57         {
  58             {
  59                 .id      = V4L2_CID_BRIGHTNESS,
  60                 .type    = V4L2_CTRL_TYPE_INTEGER,
  61                 .name    = "Brightness",
  62                 .minimum = 0,
  63                 .maximum = 255,
  64                 .step    = 1,
  65 #define BRIGHTNESS_DEF 127
  66                 .default_value = BRIGHTNESS_DEF,
  67             },
  68             .set = sd_setbrightness,
  69             .get = sd_getbrightness,
  70         },
  71         {
  72             {
  73                 .id      = V4L2_CID_CONTRAST,
  74                 .type    = V4L2_CTRL_TYPE_INTEGER,
  75                 .name    = "Contrast",
  76                 .minimum = 0,
  77                 .maximum = 255,
  78                 .step    = 1,
  79 #define CONTRAST_DEF 127
  80                 .default_value = CONTRAST_DEF,
  81             },
  82             .set = sd_setcontrast,
  83             .get = sd_getcontrast,
  84         },
  85         {
  86             {
  87                 .id      = V4L2_CID_SATURATION,
  88                 .type    = V4L2_CTRL_TYPE_INTEGER,
  89                 .name    = "Color",
  90                 .minimum = 0,
  91                 .maximum = 255,
  92                 .step    = 1,
  93 #define COLOR_DEF 127
  94                 .default_value = COLOR_DEF,
  95             },
  96             .set = sd_setcolors,
  97             .get = sd_getcolors,
  98         },
  99         {
 100             {
 101                 .id      = V4L2_CID_POWER_LINE_FREQUENCY,
 102                 .type    = V4L2_CTRL_TYPE_MENU,
 103                 .name    = "Light frequency filter",
 104                 .minimum = 1,
 105                 .maximum = 2,   /* 0: 0, 1: 50Hz, 2:60Hz */
 106                 .step    = 1,
 107 #define FREQ_DEF 1
 108                 .default_value = FREQ_DEF,
 109             },
 110             .set = sd_setfreq,
 111             .get = sd_getfreq,
 112         },
 113 };
 114
 115 static const struct v4l2_pix_format vga_mode[] = {
 116         {320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
 117                 .bytesperline = 320,
 118                 .sizeimage = 320 * 240 * 3 / 8 + 590,
 119                 .colorspace = V4L2_COLORSPACE_JPEG,
 120                 .priv = 1},
 121         {640, 480, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
 122                 .bytesperline = 640,
 123                 .sizeimage = 640 * 480 * 3 / 8 + 590,
 124                 .colorspace = V4L2_COLORSPACE_JPEG,
 125                 .priv = 0},
 126 };
 127
 128 /* -- read a register -- */
 129 static u8 reg_r(struct gspca_dev *gspca_dev,
 130                         __u16 index)
 131 {
 132         struct usb_device *dev = gspca_dev->dev;
 133         int ret;
 134
 135         if (gspca_dev->usb_err < 0)
 136                 return 0;
 137         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 138                         0x00,
 139                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 140                         0x00,
 141                         index,
 142                         gspca_dev->usb_buf, 1,
 143                         500);
 144         if (ret < 0) {
 145                 PDEBUG(D_ERR, "reg_r err %d", ret);
 146                 gspca_dev->usb_err = ret;
 147                 return 0;
 148         }
 149         return gspca_dev->usb_buf[0];
 150 }
 151
 152 /* -- write a register -- */
 153 static void reg_w(struct gspca_dev *gspca_dev,
 154                         __u16 index, __u16 value)
 155 {
 156         struct usb_device *dev = gspca_dev->dev;
 157         int ret;
 158
 159         if (gspca_dev->usb_err < 0)
 160                 return;
 161         ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 162                         0x01,
 163                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 164                         value,
 165                         index,
 166                         NULL,
 167                         0,
 168                         500);
 169         if (ret < 0) {
 170                 PDEBUG(D_ERR, "reg_w err %d", ret);
 171                 gspca_dev->usb_err = ret;
 172         }
 173 }
 174
 175 /* -- get a bulk value (4 bytes) -- */
 176 static void rcv_val(struct gspca_dev *gspca_dev,
 177                         int ads)
 178 {
 179         struct usb_device *dev = gspca_dev->dev;
 180         int alen, ret;
 181
 182         reg_w(gspca_dev, 0x634, (ads >> 16) & 0xff);
 183         reg_w(gspca_dev, 0x635, (ads >> 8) & 0xff);
 184         reg_w(gspca_dev, 0x636, ads & 0xff);
 185         reg_w(gspca_dev, 0x637, 0);
 186         reg_w(gspca_dev, 0x638, 4);     /* len & 0xff */
 187         reg_w(gspca_dev, 0x639, 0);     /* len >> 8 */
 188         reg_w(gspca_dev, 0x63a, 0);
 189         reg_w(gspca_dev, 0x63b, 0);
 190         reg_w(gspca_dev, 0x630, 5);
 191         if (gspca_dev->usb_err < 0)
 192                 return;
 193         ret = usb_bulk_msg(dev,
 194                         usb_rcvbulkpipe(dev, 0x05),
 195                         gspca_dev->usb_buf,
 196                         4,              /* length */
 197                         &alen,
 198                         500);           /* timeout in milliseconds */
 199         if (ret < 0) {
 200                 PDEBUG(D_ERR, "rcv_val err %d", ret);
 201                 gspca_dev->usb_err = ret;
 202         }
 203 }
 204
 205 /* -- send a bulk value -- */
 206 static void snd_val(struct gspca_dev *gspca_dev,
 207                         int ads,
 208                         unsigned int val)
 209 {
 210         struct usb_device *dev = gspca_dev->dev;
 211         int alen, ret;
 212         __u8 seq = 0;
 213
 214         if (ads == 0x003f08) {
 215                 reg_r(gspca_dev, 0x0704);
 216                 seq = reg_r(gspca_dev, 0x0705);
 217                 reg_r(gspca_dev, 0x0650);
 218                 reg_w(gspca_dev, 0x654, seq);
 219         } else {
 220                 reg_w(gspca_dev, 0x654, (ads >> 16) & 0xff);
 221         }
 222         reg_w(gspca_dev, 0x655, (ads >> 8) & 0xff);
 223         reg_w(gspca_dev, 0x656, ads & 0xff);
 224         reg_w(gspca_dev, 0x657, 0);
 225         reg_w(gspca_dev, 0x658, 0x04);  /* size */
 226         reg_w(gspca_dev, 0x659, 0);
 227         reg_w(gspca_dev, 0x65a, 0);
 228         reg_w(gspca_dev, 0x65b, 0);
 229         reg_w(gspca_dev, 0x650, 5);
 230         if (gspca_dev->usb_err < 0)
 231                 return;
 232         gspca_dev->usb_buf[0] = val >> 24;
 233         gspca_dev->usb_buf[1] = val >> 16;
 234         gspca_dev->usb_buf[2] = val >> 8;
 235         gspca_dev->usb_buf[3] = val;
 236         ret = usb_bulk_msg(dev,
 237                         usb_sndbulkpipe(dev, 6),
 238                         gspca_dev->usb_buf,
 239                         4,
 240                         &alen,
 241                         500);   /* timeout in milliseconds */
 242         if (ret < 0) {
 243                 PDEBUG(D_ERR, "snd_val err %d", ret);
 244                 gspca_dev->usb_err = ret;
 245         } else {
 246                 if (ads == 0x003f08) {
 247                         seq += 4;
 248                         seq &= 0x3f;
 249                         reg_w(gspca_dev, 0x705, seq);
 250                 }
 251         }
 252 }
 253
 254 /* set a camera parameter */
 255 static void set_par(struct gspca_dev *gspca_dev,
 256                    int parval)
 257 {
 258         snd_val(gspca_dev, 0x003f08, parval);
 259 }
 260
 261 static void setbrightness(struct gspca_dev *gspca_dev)
 262 {
 263         struct sd *sd = (struct sd *) gspca_dev;
 264         int parval;
 265
 266         parval = 0x06000000             /* whiteness */
 267                 + (sd->brightness << 16);
 268         set_par(gspca_dev, parval);
 269 }
 270
 271 static void setcontrast(struct gspca_dev *gspca_dev)
 272 {
 273         struct sd *sd = (struct sd *) gspca_dev;
 274         int parval;
 275
 276         parval = 0x07000000             /* contrast */
 277                 + (sd->contrast << 16);
 278         set_par(gspca_dev, parval);
 279 }
 280
 281 static void setcolors(struct gspca_dev *gspca_dev)
 282 {
 283         struct sd *sd = (struct sd *) gspca_dev;
 284         int parval;
 285
 286         parval = 0x08000000             /* saturation */
 287                 + (sd->colors << 16);
 288         set_par(gspca_dev, parval);
 289 }
 290
 291 static void setfreq(struct gspca_dev *gspca_dev)
 292 {
 293         struct sd *sd = (struct sd *) gspca_dev;
 294
 295         set_par(gspca_dev, sd->lightfreq == 1
 296                         ? 0x33640000            /* 50 Hz */
 297                         : 0x33780000);          /* 60 Hz */
 298 }
 299
 300 /* this function is called at probe time */
 301 static int sd_config(struct gspca_dev *gspca_dev,
 302                         const struct usb_device_id *id)
 303 {
 304         struct sd *sd = (struct sd *) gspca_dev;
 305
 306         gspca_dev->cam.cam_mode = vga_mode;
 307         gspca_dev->cam.nmodes = ARRAY_SIZE(vga_mode);
 308         sd->brightness = BRIGHTNESS_DEF;
 309         sd->contrast = CONTRAST_DEF;
 310         sd->colors = COLOR_DEF;
 311         sd->lightfreq = FREQ_DEF;
 312         sd->quality = QUALITY_DEF;
 313         return 0;
 314 }
 315
 316 /* this function is called at probe and resume time */
 317 static int sd_init(struct gspca_dev *gspca_dev)
 318 {
 319         u8 ret;
 320
 321         /* check if the device responds */
 322         usb_set_interface(gspca_dev->dev, gspca_dev->iface, 1);
 323         ret = reg_r(gspca_dev, 0x0740);
 324         if (gspca_dev->usb_err >= 0) {
 325                 if (ret != 0xff) {
 326                         PDEBUG(D_ERR|D_STREAM, "init reg: 0x%02x", ret);
 327                         gspca_dev->usb_err = -EIO;
 328                 }
 329         }
 330         return gspca_dev->usb_err;
 331 }
 332
 333 /* -- start the camera -- */
 334 static int sd_start(struct gspca_dev *gspca_dev)
 335 {
 336         struct sd *sd = (struct sd *) gspca_dev;
 337         int ret, value;
 338
 339         /* create the JPEG header */
 340         jpeg_define(sd->jpeg_hdr, gspca_dev->height, gspca_dev->width,
 341                         0x22);          /* JPEG 411 */
 342         jpeg_set_qual(sd->jpeg_hdr, sd->quality);
 343
 344         /* work on alternate 1 */
 345         usb_set_interface(gspca_dev->dev, gspca_dev->iface, 1);
 346
 347         set_par(gspca_dev, 0x10000000);
 348         set_par(gspca_dev, 0x00000000);
 349         set_par(gspca_dev, 0x8002e001);
 350         set_par(gspca_dev, 0x14000000);
 351         if (gspca_dev->width > 320)
 352                 value = 0x8002e001;             /* 640x480 */
 353         else
 354                 value = 0x4001f000;             /* 320x240 */
 355         set_par(gspca_dev, value);
 356         ret = usb_set_interface(gspca_dev->dev,
 357                                         gspca_dev->iface,
 358                                         gspca_dev->alt);
 359         if (ret < 0) {
 360                 PDEBUG(D_ERR|D_STREAM, "set intf %d %d failed",
 361                         gspca_dev->iface, gspca_dev->alt);
 362                 gspca_dev->usb_err = ret;
 363                 goto out;
 364         }
 365          reg_r(gspca_dev, 0x0630);
 366         rcv_val(gspca_dev, 0x000020);   /* << (value ff ff ff ff) */
 367         reg_r(gspca_dev, 0x0650);
 368         snd_val(gspca_dev, 0x000020, 0xffffffff);
 369         reg_w(gspca_dev, 0x0620, 0);
 370         reg_w(gspca_dev, 0x0630, 0);
 371         reg_w(gspca_dev, 0x0640, 0);
 372         reg_w(gspca_dev, 0x0650, 0);
 373         reg_w(gspca_dev, 0x0660, 0);
 374         setbrightness(gspca_dev);               /* whiteness */
 375         setcontrast(gspca_dev);                 /* contrast */
 376         setcolors(gspca_dev);                   /* saturation */
 377         set_par(gspca_dev, 0x09800000);         /* Red ? */
 378         set_par(gspca_dev, 0x0a800000);         /* Green ? */
 379         set_par(gspca_dev, 0x0b800000);         /* Blue ? */
 380         set_par(gspca_dev, 0x0d030000);         /* Gamma ? */
 381         setfreq(gspca_dev);                     /* light frequency */
 382
 383         /* start the video flow */
 384         set_par(gspca_dev, 0x01000000);
 385         set_par(gspca_dev, 0x01000000);
 386         if (gspca_dev->usb_err >= 0)
 387                 PDEBUG(D_STREAM, "camera started alt: 0x%02x",
 388                                 gspca_dev->alt);
 389 out:
 390         return gspca_dev->usb_err;
 391 }
 392
 393 static void sd_stopN(struct gspca_dev *gspca_dev)
 394 {
 395         struct usb_device *dev = gspca_dev->dev;
 396
 397         set_par(gspca_dev, 0x02000000);
 398         set_par(gspca_dev, 0x02000000);
 399         usb_set_interface(dev, gspca_dev->iface, 1);
 400         reg_r(gspca_dev, 0x0630);
 401         rcv_val(gspca_dev, 0x000020);   /* << (value ff ff ff ff) */
 402         reg_r(gspca_dev, 0x0650);
 403         snd_val(gspca_dev, 0x000020, 0xffffffff);
 404         reg_w(gspca_dev, 0x0620, 0);
 405         reg_w(gspca_dev, 0x0630, 0);
 406         reg_w(gspca_dev, 0x0640, 0);
 407         reg_w(gspca_dev, 0x0650, 0);
 408         reg_w(gspca_dev, 0x0660, 0);
 409         PDEBUG(D_STREAM, "camera stopped");
 410 }
 411
 412 static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 413                         u8 *data,                       /* isoc packet */
 414                         int len)                        /* iso packet length */
 415 {
 416         struct sd *sd = (struct sd *) gspca_dev;
 417         static unsigned char ffd9[] = {0xff, 0xd9};
 418
 419         /* a frame starts with:
 420          *      - 0xff 0xfe
 421          *      - 0x08 0x00     - length (little endian ?!)
 422          *      - 4 bytes = size of whole frame (BE - including header)
 423          *      - 0x00 0x0c
 424          *      - 0xff 0xd8
 425          *      - ..    JPEG image with escape sequences (ff 00)
 426          *              (without ending - ff d9)
 427          */
 428         if (data[0] == 0xff && data[1] == 0xfe) {
 429                 gspca_frame_add(gspca_dev, LAST_PACKET,
 430                                 ffd9, 2);
 431
 432                 /* put the JPEG 411 header */
 433                 gspca_frame_add(gspca_dev, FIRST_PACKET,
 434                         sd->jpeg_hdr, JPEG_HDR_SZ);
 435
 436                 /* beginning of the frame */
 437 #define STKHDRSZ 12
 438                 data += STKHDRSZ;
 439                 len -= STKHDRSZ;
 440         }
 441         gspca_frame_add(gspca_dev, INTER_PACKET, data, len);
 442 }
 443
 444 static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val)
 445 {
 446         struct sd *sd = (struct sd *) gspca_dev;
 447
 448         sd->brightness = val;
 449         if (gspca_dev->streaming)
 450                 setbrightness(gspca_dev);
 451         return gspca_dev->usb_err;
 452 }
 453
 454 static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val)
 455 {
 456         struct sd *sd = (struct sd *) gspca_dev;
 457
 458         *val = sd->brightness;
 459         return 0;
 460 }
 461
 462 static int sd_setcontrast(struct gspca_dev *gspca_dev, __s32 val)
 463 {
 464         struct sd *sd = (struct sd *) gspca_dev;
 465
 466         sd->contrast = val;
 467         if (gspca_dev->streaming)
 468                 setcontrast(gspca_dev);
 469         return gspca_dev->usb_err;
 470 }
 471
 472 static int sd_getcontrast(struct gspca_dev *gspca_dev, __s32 *val)
 473 {
 474         struct sd *sd = (struct sd *) gspca_dev;
 475
 476         *val = sd->contrast;
 477         return 0;
 478 }
 479
 480 static int sd_setcolors(struct gspca_dev *gspca_dev, __s32 val)
 481 {
 482         struct sd *sd = (struct sd *) gspca_dev;
 483
 484         sd->colors = val;
 485         if (gspca_dev->streaming)
 486                 setcolors(gspca_dev);
 487         return gspca_dev->usb_err;
 488 }
 489
 490 static int sd_getcolors(struct gspca_dev *gspca_dev, __s32 *val)
 491 {
 492         struct sd *sd = (struct sd *) gspca_dev;
 493
 494         *val = sd->colors;
 495         return 0;
 496 }
 497
 498 static int sd_setfreq(struct gspca_dev *gspca_dev, __s32 val)
 499 {
 500         struct sd *sd = (struct sd *) gspca_dev;
 501
 502         sd->lightfreq = val;
 503         if (gspca_dev->streaming)
 504                 setfreq(gspca_dev);
 505         return gspca_dev->usb_err;
 506 }
 507
 508 static int sd_getfreq(struct gspca_dev *gspca_dev, __s32 *val)
 509 {
 510         struct sd *sd = (struct sd *) gspca_dev;
 511
 512         *val = sd->lightfreq;
 513         return 0;
 514 }
 515
 516 static int sd_querymenu(struct gspca_dev *gspca_dev,
 517                         struct v4l2_querymenu *menu)
 518 {
 519         switch (menu->id) {
 520         case V4L2_CID_POWER_LINE_FREQUENCY:
 521                 switch (menu->index) {
 522                 case 1:         /* V4L2_CID_POWER_LINE_FREQUENCY_50HZ */
 523                         strcpy((char *) menu->name, "50 Hz");
 524                         return 0;
 525                 case 2:         /* V4L2_CID_POWER_LINE_FREQUENCY_60HZ */
 526                         strcpy((char *) menu->name, "60 Hz");
 527                         return 0;
 528                 }
 529                 break;
 530         }
 531         return -EINVAL;
 532 }
 533
 534 static int sd_set_jcomp(struct gspca_dev *gspca_dev,
 535                         struct v4l2_jpegcompression *jcomp)
 536 {
 537         struct sd *sd = (struct sd *) gspca_dev;
 538
 539         if (jcomp->quality < QUALITY_MIN)
 540                 sd->quality = QUALITY_MIN;
 541         else if (jcomp->quality > QUALITY_MAX)
 542                 sd->quality = QUALITY_MAX;
 543         else
 544                 sd->quality = jcomp->quality;
 545         if (gspca_dev->streaming)
 546                 jpeg_set_qual(sd->jpeg_hdr, sd->quality);
 547         return gspca_dev->usb_err;
 548 }
 549
 550 static int sd_get_jcomp(struct gspca_dev *gspca_dev,
 551                         struct v4l2_jpegcompression *jcomp)
 552 {
 553         struct sd *sd = (struct sd *) gspca_dev;
 554
 555         memset(jcomp, 0, sizeof *jcomp);
 556         jcomp->quality = sd->quality;
 557         jcomp->jpeg_markers = V4L2_JPEG_MARKER_DHT
 558                         | V4L2_JPEG_MARKER_DQT;
 559         return 0;
 560 }
 561
 562 /* sub-driver description */
 563 static const struct sd_desc sd_desc = {
 564         .name = MODULE_NAME,
 565         .ctrls = sd_ctrls,
 566         .nctrls = ARRAY_SIZE(sd_ctrls),
 567         .config = sd_config,
 568         .init = sd_init,
 569         .start = sd_start,
 570         .stopN = sd_stopN,
 571         .pkt_scan = sd_pkt_scan,
 572         .querymenu = sd_querymenu,
 573         .get_jcomp = sd_get_jcomp,
 574         .set_jcomp = sd_set_jcomp,
 575 };
 576
 577 /* -- module initialisation -- */
 578 static const __devinitdata struct usb_device_id device_table[] = {
 579         {USB_DEVICE(0x05e1, 0x0893)},
 580         {}
 581 };
 582 MODULE_DEVICE_TABLE(usb, device_table);
 583
 584 /* -- device connect -- */
 585 static int sd_probe(struct usb_interface *intf,
 586                         const struct usb_device_id *id)
 587 {
 588         return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
 589                                 THIS_MODULE);
 590 }
 591
 592 static struct usb_driver sd_driver = {
 593         .name = MODULE_NAME,
 594         .id_table = device_table,
 595         .probe = sd_probe,
 596         .disconnect = gspca_disconnect,
 597 #ifdef CONFIG_PM
 598         .suspend = gspca_suspend,
 599         .resume = gspca_resume,
 600 #endif
 601 };
 602
 603 /* -- module insert / remove -- */
 604 static int __init sd_mod_init(void)
 605 {
 606         int ret;
 607         ret = usb_register(&sd_driver);
 608         if (ret < 0)
 609                 return ret;
 610         info("registered");
 611         return 0;
 612 }
 613 static void __exit sd_mod_exit(void)
 614 {
 615         usb_deregister(&sd_driver);
 616         info("deregistered");
 617 }
 618
 619 module_init(sd_mod_init);
 620 module_exit(sd_mod_exit);