git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/gspca/pac207.c

   1 /*
   2  * Pixart PAC207BCA library
   3  *
   4  * Copyright (C) 2008 Hans de Goede <j.w.r.degoede@hhs.nl>
   5  * Copyright (C) 2005 Thomas Kaiser thomas@kaiser-linux.li
   6  * Copyleft (C) 2005 Michel Xhaard mxhaard@magic.fr
   7  *
   8  * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  */
  25
  26 #define MODULE_NAME "pac207"
  27
  28 #include "gspca.h"
  29
  30 MODULE_AUTHOR("Hans de Goede <j.w.r.degoede@hhs.nl>");
  31 MODULE_DESCRIPTION("Pixart PAC207");
  32 MODULE_LICENSE("GPL");
  33
  34 #define PAC207_CTRL_TIMEOUT             100  /* ms */
  35
  36 #define PAC207_BRIGHTNESS_MIN           0
  37 #define PAC207_BRIGHTNESS_MAX           255
  38 #define PAC207_BRIGHTNESS_DEFAULT       4 /* power on default: 4 */
  39
  40 /* An exposure value of 4 also works (3 does not) but then we need to lower
  41    the compression balance setting when in 352x288 mode, otherwise the usb
  42    bandwidth is not enough and packets get dropped resulting in corrupt
  43    frames. The problem with this is that when the compression balance gets
  44    lowered below 0x80, the pac207 starts using a different compression
  45    algorithm for some lines, these lines get prefixed with a 0x2dd2 prefix
  46    and currently we do not know how to decompress these lines, so for now
  47    we use a minimum exposure value of 5 */
  48 #define PAC207_EXPOSURE_MIN             5
  49 #define PAC207_EXPOSURE_MAX             26
  50 #define PAC207_EXPOSURE_DEFAULT         5 /* power on default: 3 ?? */
  51 #define PAC207_EXPOSURE_KNEE            11 /* 4 = 30 fps, 11 = 8, 15 = 6 */
  52
  53 #define PAC207_GAIN_MIN                 0
  54 #define PAC207_GAIN_MAX                 31
  55 #define PAC207_GAIN_DEFAULT             9 /* power on default: 9 */
  56 #define PAC207_GAIN_KNEE                20
  57
  58 #define PAC207_AUTOGAIN_DEADZONE        30
  59
  60 /* specific webcam descriptor */
  61 struct sd {
  62         struct gspca_dev gspca_dev;             /* !! must be the first item */
  63
  64         u8 mode;
  65
  66         u8 brightness;
  67         u8 exposure;
  68         u8 autogain;
  69         u8 gain;
  70
  71         u8 sof_read;
  72         u8 header_read;
  73         u8 autogain_ignore_frames;
  74
  75         atomic_t avg_lum;
  76 };
  77
  78 /* V4L2 controls supported by the driver */
  79 static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val);
  80 static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val);
  81 static int sd_setexposure(struct gspca_dev *gspca_dev, __s32 val);
  82 static int sd_getexposure(struct gspca_dev *gspca_dev, __s32 *val);
  83 static int sd_setautogain(struct gspca_dev *gspca_dev, __s32 val);
  84 static int sd_getautogain(struct gspca_dev *gspca_dev, __s32 *val);
  85 static int sd_setgain(struct gspca_dev *gspca_dev, __s32 val);
  86 static int sd_getgain(struct gspca_dev *gspca_dev, __s32 *val);
  87
  88 static struct ctrl sd_ctrls[] = {
  89 #define SD_BRIGHTNESS 0
  90         {
  91             {
  92                 .id      = V4L2_CID_BRIGHTNESS,
  93                 .type    = V4L2_CTRL_TYPE_INTEGER,
  94                 .name    = "Brightness",
  95                 .minimum = PAC207_BRIGHTNESS_MIN,
  96                 .maximum = PAC207_BRIGHTNESS_MAX,
  97                 .step = 1,
  98                 .default_value = PAC207_BRIGHTNESS_DEFAULT,
  99                 .flags = 0,
 100             },
 101             .set = sd_setbrightness,
 102             .get = sd_getbrightness,
 103         },
 104 #define SD_EXPOSURE 1
 105         {
 106             {
 107                 .id = V4L2_CID_EXPOSURE,
 108                 .type = V4L2_CTRL_TYPE_INTEGER,
 109                 .name = "exposure",
 110                 .minimum = PAC207_EXPOSURE_MIN,
 111                 .maximum = PAC207_EXPOSURE_MAX,
 112                 .step = 1,
 113                 .default_value = PAC207_EXPOSURE_DEFAULT,
 114                 .flags = 0,
 115             },
 116             .set = sd_setexposure,
 117             .get = sd_getexposure,
 118         },
 119 #define SD_AUTOGAIN 2
 120         {
 121             {
 122                 .id       = V4L2_CID_AUTOGAIN,
 123                 .type   = V4L2_CTRL_TYPE_BOOLEAN,
 124                 .name   = "Auto Gain",
 125                 .minimum = 0,
 126                 .maximum = 1,
 127                 .step   = 1,
 128 #define AUTOGAIN_DEF 1
 129                 .default_value = AUTOGAIN_DEF,
 130                 .flags = 0,
 131             },
 132             .set = sd_setautogain,
 133             .get = sd_getautogain,
 134         },
 135 #define SD_GAIN 3
 136         {
 137             {
 138                 .id = V4L2_CID_GAIN,
 139                 .type = V4L2_CTRL_TYPE_INTEGER,
 140                 .name = "gain",
 141                 .minimum = PAC207_GAIN_MIN,
 142                 .maximum = PAC207_GAIN_MAX,
 143                 .step = 1,
 144                 .default_value = PAC207_GAIN_DEFAULT,
 145                 .flags = 0,
 146             },
 147             .set = sd_setgain,
 148             .get = sd_getgain,
 149         },
 150 };
 151
 152 static struct v4l2_pix_format sif_mode[] = {
 153         {176, 144, V4L2_PIX_FMT_PAC207, V4L2_FIELD_NONE,
 154                 .bytesperline = 176,
 155                 .sizeimage = (176 + 2) * 144,
 156                         /* uncompressed, add 2 bytes / line for line header */
 157                 .colorspace = V4L2_COLORSPACE_SRGB,
 158                 .priv = 1},
 159         {352, 288, V4L2_PIX_FMT_PAC207, V4L2_FIELD_NONE,
 160                 .bytesperline = 352,
 161                         /* compressed, but only when needed (not compressed
 162                            when the framerate is low) */
 163                 .sizeimage = (352 + 2) * 288,
 164                 .colorspace = V4L2_COLORSPACE_SRGB,
 165                 .priv = 0},
 166 };
 167
 168 static const __u8 pac207_sensor_init[][8] = {
 169         {0x10, 0x12, 0x0d, 0x12, 0x0c, 0x01, 0x29, 0xf0},
 170         {0x00, 0x64, 0x64, 0x64, 0x04, 0x10, 0xf0, 0x30},
 171         {0x00, 0x00, 0x00, 0x70, 0xa0, 0xf8, 0x00, 0x00},
 172         {0x00, 0x00, 0x32, 0x00, 0x96, 0x00, 0xa2, 0x02},
 173         {0x32, 0x00, 0x96, 0x00, 0xA2, 0x02, 0xaf, 0x00},
 174 };
 175
 176                         /* 48 reg_72 Rate Control end BalSize_4a =0x36 */
 177 static const __u8 PacReg72[] = { 0x00, 0x00, 0x36, 0x00 };
 178
 179 static int pac207_write_regs(struct gspca_dev *gspca_dev, u16 index,
 180         const u8 *buffer, u16 length)
 181 {
 182         struct usb_device *udev = gspca_dev->dev;
 183         int err;
 184
 185         memcpy(gspca_dev->usb_buf, buffer, length);
 186
 187         err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x01,
 188                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 189                         0x00, index,
 190                         gspca_dev->usb_buf, length, PAC207_CTRL_TIMEOUT);
 191         if (err < 0)
 192                 PDEBUG(D_ERR,
 193                         "Failed to write registers to index 0x%04X, error %d)",
 194                         index, err);
 195
 196         return err;
 197 }
 198
 199
 200 static int pac207_write_reg(struct gspca_dev *gspca_dev, u16 index, u16 value)
 201 {
 202         struct usb_device *udev = gspca_dev->dev;
 203         int err;
 204
 205         err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00,
 206                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 207                         value, index, NULL, 0, PAC207_CTRL_TIMEOUT);
 208         if (err)
 209                 PDEBUG(D_ERR, "Failed to write a register (index 0x%04X,"
 210                         " value 0x%02X, error %d)", index, value, err);
 211
 212         return err;
 213 }
 214
 215 static int pac207_read_reg(struct gspca_dev *gspca_dev, u16 index)
 216 {
 217         struct usb_device *udev = gspca_dev->dev;
 218         int res;
 219
 220         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00,
 221                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 222                         0x00, index,
 223                         gspca_dev->usb_buf, 1, PAC207_CTRL_TIMEOUT);
 224         if (res < 0) {
 225                 PDEBUG(D_ERR,
 226                         "Failed to read a register (index 0x%04X, error %d)",
 227                         index, res);
 228                 return res;
 229         }
 230
 231         return gspca_dev->usb_buf[0];
 232 }
 233
 234 /* this function is called at probe time */
 235 static int sd_config(struct gspca_dev *gspca_dev,
 236                         const struct usb_device_id *id)
 237 {
 238         struct sd *sd = (struct sd *) gspca_dev;
 239         struct cam *cam;
 240         u8 idreg[2];
 241
 242         idreg[0] = pac207_read_reg(gspca_dev, 0x0000);
 243         idreg[1] = pac207_read_reg(gspca_dev, 0x0001);
 244         idreg[0] = ((idreg[0] & 0x0F) << 4) | ((idreg[1] & 0xf0) >> 4);
 245         idreg[1] = idreg[1] & 0x0f;
 246         PDEBUG(D_PROBE, "Pixart Sensor ID 0x%02X Chips ID 0x%02X",
 247                 idreg[0], idreg[1]);
 248
 249         if (idreg[0] != 0x27) {
 250                 PDEBUG(D_PROBE, "Error invalid sensor ID!");
 251                 return -ENODEV;
 252         }
 253
 254         PDEBUG(D_PROBE,
 255                 "Pixart PAC207BCA Image Processor and Control Chip detected"
 256                 " (vid/pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
 257
 258         cam = &gspca_dev->cam;
 259         cam->epaddr = 0x05;
 260         cam->cam_mode = sif_mode;
 261         cam->nmodes = ARRAY_SIZE(sif_mode);
 262         sd->brightness = PAC207_BRIGHTNESS_DEFAULT;
 263         sd->exposure = PAC207_EXPOSURE_DEFAULT;
 264         sd->gain = PAC207_GAIN_DEFAULT;
 265         sd->autogain = AUTOGAIN_DEF;
 266
 267         return 0;
 268 }
 269
 270 /* this function is called at probe and resume time */
 271 static int sd_init(struct gspca_dev *gspca_dev)
 272 {
 273         pac207_write_reg(gspca_dev, 0x41, 0x00);
 274                                 /* Bit_0=Image Format,
 275                                  * Bit_1=LED,
 276                                  * Bit_2=Compression test mode enable */
 277         pac207_write_reg(gspca_dev, 0x0f, 0x00); /* Power Control */
 278         pac207_write_reg(gspca_dev, 0x11, 0x30); /* Analog Bias */
 279
 280         return 0;
 281 }
 282
 283 /* -- start the camera -- */
 284 static int sd_start(struct gspca_dev *gspca_dev)
 285 {
 286         struct sd *sd = (struct sd *) gspca_dev;
 287         __u8 mode;
 288
 289         pac207_write_reg(gspca_dev, 0x0f, 0x10); /* Power control (Bit 6-0) */
 290         pac207_write_regs(gspca_dev, 0x0002, pac207_sensor_init[0], 8);
 291         pac207_write_regs(gspca_dev, 0x000a, pac207_sensor_init[1], 8);
 292         pac207_write_regs(gspca_dev, 0x0012, pac207_sensor_init[2], 8);
 293         pac207_write_regs(gspca_dev, 0x0040, pac207_sensor_init[3], 8);
 294         pac207_write_regs(gspca_dev, 0x0042, pac207_sensor_init[4], 8);
 295         pac207_write_regs(gspca_dev, 0x0048, PacReg72, 4);
 296
 297         /* Compression Balance */
 298         if (gspca_dev->width == 176)
 299                 pac207_write_reg(gspca_dev, 0x4a, 0xff);
 300         else
 301                 pac207_write_reg(gspca_dev, 0x4a, 0x88);
 302         pac207_write_reg(gspca_dev, 0x4b, 0x00); /* Sram test value */
 303         pac207_write_reg(gspca_dev, 0x08, sd->brightness);
 304
 305         /* PGA global gain (Bit 4-0) */
 306         pac207_write_reg(gspca_dev, 0x0e, sd->gain);
 307         pac207_write_reg(gspca_dev, 0x02, sd->exposure); /* PXCK = 12MHz /n */
 308
 309         mode = 0x02; /* Image Format (Bit 0), LED (1), Compr. test mode (2) */
 310         if (gspca_dev->width == 176) {  /* 176x144 */
 311                 mode |= 0x01;
 312                 PDEBUG(D_STREAM, "pac207_start mode 176x144");
 313         } else {                                /* 352x288 */
 314                 PDEBUG(D_STREAM, "pac207_start mode 352x288");
 315         }
 316         pac207_write_reg(gspca_dev, 0x41, mode);
 317
 318         pac207_write_reg(gspca_dev, 0x13, 0x01); /* Bit 0, auto clear */
 319         pac207_write_reg(gspca_dev, 0x1c, 0x01); /* not documented */
 320         msleep(10);
 321         pac207_write_reg(gspca_dev, 0x40, 0x01); /* Start ISO pipe */
 322
 323         sd->sof_read = 0;
 324         sd->autogain_ignore_frames = 0;
 325         atomic_set(&sd->avg_lum, -1);
 326         return 0;
 327 }
 328
 329 static void sd_stopN(struct gspca_dev *gspca_dev)
 330 {
 331         pac207_write_reg(gspca_dev, 0x40, 0x00); /* Stop ISO pipe */
 332         pac207_write_reg(gspca_dev, 0x41, 0x00); /* Turn of LED */
 333         pac207_write_reg(gspca_dev, 0x0f, 0x00); /* Power Control */
 334 }
 335
 336 /* Include pac common sof detection functions */
 337 #include "pac_common.h"
 338
 339 static void pac207_do_auto_gain(struct gspca_dev *gspca_dev)
 340 {
 341         struct sd *sd = (struct sd *) gspca_dev;
 342         int avg_lum = atomic_read(&sd->avg_lum);
 343
 344         if (avg_lum == -1)
 345                 return;
 346
 347         if (sd->autogain_ignore_frames > 0)
 348                 sd->autogain_ignore_frames--;
 349         else if (gspca_auto_gain_n_exposure(gspca_dev, avg_lum,
 350                         100 + sd->brightness / 2, PAC207_AUTOGAIN_DEADZONE,
 351                         PAC207_GAIN_KNEE, PAC207_EXPOSURE_KNEE))
 352                 sd->autogain_ignore_frames = PAC_AUTOGAIN_IGNORE_FRAMES;
 353 }
 354
 355 static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 356                         struct gspca_frame *frame,
 357                         __u8 *data,
 358                         int len)
 359 {
 360         struct sd *sd = (struct sd *) gspca_dev;
 361         unsigned char *sof;
 362
 363         sof = pac_find_sof(gspca_dev, data, len);
 364         if (sof) {
 365                 int n;
 366
 367                 /* finish decoding current frame */
 368                 n = sof - data;
 369                 if (n > sizeof pac_sof_marker)
 370                         n -= sizeof pac_sof_marker;
 371                 else
 372                         n = 0;
 373                 frame = gspca_frame_add(gspca_dev, LAST_PACKET, frame,
 374                                         data, n);
 375                 sd->header_read = 0;
 376                 gspca_frame_add(gspca_dev, FIRST_PACKET, frame, NULL, 0);
 377                 len -= sof - data;
 378                 data = sof;
 379         }
 380         if (sd->header_read < 11) {
 381                 int needed;
 382
 383                 /* get average lumination from frame header (byte 5) */
 384                 if (sd->header_read < 5) {
 385                         needed = 5 - sd->header_read;
 386                         if (len >= needed)
 387                                 atomic_set(&sd->avg_lum, data[needed - 1]);
 388                 }
 389                 /* skip the rest of the header */
 390                 needed = 11 - sd->header_read;
 391                 if (len <= needed) {
 392                         sd->header_read += len;
 393                         return;
 394                 }
 395                 data += needed;
 396                 len -= needed;
 397                 sd->header_read = 11;
 398         }
 399
 400         gspca_frame_add(gspca_dev, INTER_PACKET, frame, data, len);
 401 }
 402
 403 static void setbrightness(struct gspca_dev *gspca_dev)
 404 {
 405         struct sd *sd = (struct sd *) gspca_dev;
 406
 407         pac207_write_reg(gspca_dev, 0x08, sd->brightness);
 408         pac207_write_reg(gspca_dev, 0x13, 0x01);        /* Bit 0, auto clear */
 409         pac207_write_reg(gspca_dev, 0x1c, 0x01);        /* not documented */
 410 }
 411
 412 static void setexposure(struct gspca_dev *gspca_dev)
 413 {
 414         struct sd *sd = (struct sd *) gspca_dev;
 415
 416         pac207_write_reg(gspca_dev, 0x02, sd->exposure);
 417         pac207_write_reg(gspca_dev, 0x13, 0x01);        /* Bit 0, auto clear */
 418         pac207_write_reg(gspca_dev, 0x1c, 0x01);        /* not documented */
 419 }
 420
 421 static void setgain(struct gspca_dev *gspca_dev)
 422 {
 423         struct sd *sd = (struct sd *) gspca_dev;
 424
 425         pac207_write_reg(gspca_dev, 0x0e, sd->gain);
 426         pac207_write_reg(gspca_dev, 0x13, 0x01);        /* Bit 0, auto clear */
 427         pac207_write_reg(gspca_dev, 0x1c, 0x01);        /* not documented */
 428 }
 429
 430 static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val)
 431 {
 432         struct sd *sd = (struct sd *) gspca_dev;
 433
 434         sd->brightness = val;
 435         if (gspca_dev->streaming)
 436                 setbrightness(gspca_dev);
 437         return 0;
 438 }
 439
 440 static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val)
 441 {
 442         struct sd *sd = (struct sd *) gspca_dev;
 443
 444         *val = sd->brightness;
 445         return 0;
 446 }
 447
 448 static int sd_setexposure(struct gspca_dev *gspca_dev, __s32 val)
 449 {
 450         struct sd *sd = (struct sd *) gspca_dev;
 451
 452         sd->exposure = val;
 453         if (gspca_dev->streaming)
 454                 setexposure(gspca_dev);
 455         return 0;
 456 }
 457
 458 static int sd_getexposure(struct gspca_dev *gspca_dev, __s32 *val)
 459 {
 460         struct sd *sd = (struct sd *) gspca_dev;
 461
 462         *val = sd->exposure;
 463         return 0;
 464 }
 465
 466 static int sd_setgain(struct gspca_dev *gspca_dev, __s32 val)
 467 {
 468         struct sd *sd = (struct sd *) gspca_dev;
 469
 470         sd->gain = val;
 471         if (gspca_dev->streaming)
 472                 setgain(gspca_dev);
 473         return 0;
 474 }
 475
 476 static int sd_getgain(struct gspca_dev *gspca_dev, __s32 *val)
 477 {
 478         struct sd *sd = (struct sd *) gspca_dev;
 479
 480         *val = sd->gain;
 481         return 0;
 482 }
 483
 484 static int sd_setautogain(struct gspca_dev *gspca_dev, __s32 val)
 485 {
 486         struct sd *sd = (struct sd *) gspca_dev;
 487
 488         sd->autogain = val;
 489         /* when switching to autogain set defaults to make sure
 490            we are on a valid point of the autogain gain /
 491            exposure knee graph, and give this change time to
 492            take effect before doing autogain. */
 493         if (sd->autogain) {
 494                 sd->exposure = PAC207_EXPOSURE_DEFAULT;
 495                 sd->gain = PAC207_GAIN_DEFAULT;
 496                 if (gspca_dev->streaming) {
 497                         sd->autogain_ignore_frames =
 498                                 PAC_AUTOGAIN_IGNORE_FRAMES;
 499                         setexposure(gspca_dev);
 500                         setgain(gspca_dev);
 501                 }
 502         }
 503
 504         return 0;
 505 }
 506
 507 static int sd_getautogain(struct gspca_dev *gspca_dev, __s32 *val)
 508 {
 509         struct sd *sd = (struct sd *) gspca_dev;
 510
 511         *val = sd->autogain;
 512         return 0;
 513 }
 514
 515 /* sub-driver description */
 516 static const struct sd_desc sd_desc = {
 517         .name = MODULE_NAME,
 518         .ctrls = sd_ctrls,
 519         .nctrls = ARRAY_SIZE(sd_ctrls),
 520         .config = sd_config,
 521         .init = sd_init,
 522         .start = sd_start,
 523         .stopN = sd_stopN,
 524         .dq_callback = pac207_do_auto_gain,
 525         .pkt_scan = sd_pkt_scan,
 526 };
 527
 528 /* -- module initialisation -- */
 529 static const __devinitdata struct usb_device_id device_table[] = {
 530         {USB_DEVICE(0x041e, 0x4028)},
 531         {USB_DEVICE(0x093a, 0x2460)},
 532         {USB_DEVICE(0x093a, 0x2463)},
 533         {USB_DEVICE(0x093a, 0x2464)},
 534         {USB_DEVICE(0x093a, 0x2468)},
 535         {USB_DEVICE(0x093a, 0x2470)},
 536         {USB_DEVICE(0x093a, 0x2471)},
 537         {USB_DEVICE(0x093a, 0x2472)},
 538         {USB_DEVICE(0x093a, 0x2476)},
 539         {USB_DEVICE(0x2001, 0xf115)},
 540         {}
 541 };
 542 MODULE_DEVICE_TABLE(usb, device_table);
 543
 544 /* -- device connect -- */
 545 static int sd_probe(struct usb_interface *intf,
 546                         const struct usb_device_id *id)
 547 {
 548         return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
 549                                 THIS_MODULE);
 550 }
 551
 552 static struct usb_driver sd_driver = {
 553         .name = MODULE_NAME,
 554         .id_table = device_table,
 555         .probe = sd_probe,
 556         .disconnect = gspca_disconnect,
 557 #ifdef CONFIG_PM
 558         .suspend = gspca_suspend,
 559         .resume = gspca_resume,
 560 #endif
 561 };
 562
 563 /* -- module insert / remove -- */
 564 static int __init sd_mod_init(void)
 565 {
 566         if (usb_register(&sd_driver) < 0)
 567                 return -1;
 568         PDEBUG(D_PROBE, "registered");
 569         return 0;
 570 }
 571 static void __exit sd_mod_exit(void)
 572 {
 573         usb_deregister(&sd_driver);
 574         PDEBUG(D_PROBE, "deregistered");
 575 }
 576
 577 module_init(sd_mod_init);
 578 module_exit(sd_mod_exit);