drivers/media/video/mt9v011.c

   1 /*
   2  * mt9v011 -Micron 1/4-Inch VGA Digital Image Sensor
   3  *
   4  * Copyright (c) 2009 Mauro Carvalho Chehab (mchehab@redhat.com)
   5  * This code is placed under the terms of the GNU General Public License v2
   6  */
   7
   8 #include <linux/i2c.h>
   9 #include <linux/slab.h>
  10 #include <linux/videodev2.h>
  11 #include <linux/delay.h>
  12 #include <asm/div64.h>
  13 #include <media/v4l2-device.h>
  14 #include <media/v4l2-chip-ident.h>
  15 #include "mt9v011.h"
  16
  17 MODULE_DESCRIPTION("Micron mt9v011 sensor driver");
  18 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
  19 MODULE_LICENSE("GPL");
  20
  21
  22 static int debug;
  23 module_param(debug, int, 0);
  24 MODULE_PARM_DESC(debug, "Debug level (0-2)");
  25
  26 /* supported controls */
  27 static struct v4l2_queryctrl mt9v011_qctrl[] = {
  28         {
  29                 .id = V4L2_CID_GAIN,
  30                 .type = V4L2_CTRL_TYPE_INTEGER,
  31                 .name = "Gain",
  32                 .minimum = 0,
  33                 .maximum = (1 << 10) - 1,
  34                 .step = 1,
  35                 .default_value = 0x0020,
  36                 .flags = 0,
  37         }, {
  38                 .id = V4L2_CID_RED_BALANCE,
  39                 .type = V4L2_CTRL_TYPE_INTEGER,
  40                 .name = "Red Balance",
  41                 .minimum = -1 << 9,
  42                 .maximum = (1 << 9) - 1,
  43                 .step = 1,
  44                 .default_value = 0,
  45                 .flags = 0,
  46         }, {
  47                 .id = V4L2_CID_BLUE_BALANCE,
  48                 .type = V4L2_CTRL_TYPE_INTEGER,
  49                 .name = "Blue Balance",
  50                 .minimum = -1 << 9,
  51                 .maximum = (1 << 9) - 1,
  52                 .step = 1,
  53                 .default_value = 0,
  54                 .flags = 0,
  55         }, {
  56                 .id      = V4L2_CID_HFLIP,
  57                 .type    = V4L2_CTRL_TYPE_BOOLEAN,
  58                 .name    = "Mirror",
  59                 .minimum = 0,
  60                 .maximum = 1,
  61                 .step    = 1,
  62                 .default_value = 0,
  63                 .flags = 0,
  64         }, {
  65                 .id      = V4L2_CID_VFLIP,
  66                 .type    = V4L2_CTRL_TYPE_BOOLEAN,
  67                 .name    = "Vflip",
  68                 .minimum = 0,
  69                 .maximum = 1,
  70                 .step    = 1,
  71                 .default_value = 0,
  72                 .flags = 0,
  73         }, {
  74         }
  75 };
  76
  77 struct mt9v011 {
  78         struct v4l2_subdev sd;
  79         unsigned width, height;
  80         unsigned xtal;
  81         unsigned hflip:1;
  82         unsigned vflip:1;
  83
  84         u16 global_gain, red_bal, blue_bal;
  85 };
  86
  87 static inline struct mt9v011 *to_mt9v011(struct v4l2_subdev *sd)
  88 {
  89         return container_of(sd, struct mt9v011, sd);
  90 }
  91
  92 static int mt9v011_read(struct v4l2_subdev *sd, unsigned char addr)
  93 {
  94         struct i2c_client *c = v4l2_get_subdevdata(sd);
  95         __be16 buffer;
  96         int rc, val;
  97
  98         rc = i2c_master_send(c, &addr, 1);
  99         if (rc != 1)
 100                 v4l2_dbg(0, debug, sd,
 101                          "i2c i/o error: rc == %d (should be 1)\n", rc);
 102
 103         msleep(10);
 104
 105         rc = i2c_master_recv(c, (char *)&buffer, 2);
 106         if (rc != 2)
 107                 v4l2_dbg(0, debug, sd,
 108                          "i2c i/o error: rc == %d (should be 2)\n", rc);
 109
 110         val = be16_to_cpu(buffer);
 111
 112         v4l2_dbg(2, debug, sd, "mt9v011: read 0x%02x = 0x%04x\n", addr, val);
 113
 114         return val;
 115 }
 116
 117 static void mt9v011_write(struct v4l2_subdev *sd, unsigned char addr,
 118                                  u16 value)
 119 {
 120         struct i2c_client *c = v4l2_get_subdevdata(sd);
 121         unsigned char buffer[3];
 122         int rc;
 123
 124         buffer[0] = addr;
 125         buffer[1] = value >> 8;
 126         buffer[2] = value & 0xff;
 127
 128         v4l2_dbg(2, debug, sd,
 129                  "mt9v011: writing 0x%02x 0x%04x\n", buffer[0], value);
 130         rc = i2c_master_send(c, buffer, 3);
 131         if (rc != 3)
 132                 v4l2_dbg(0, debug, sd,
 133                          "i2c i/o error: rc == %d (should be 3)\n", rc);
 134 }
 135
 136
 137 struct i2c_reg_value {
 138         unsigned char reg;
 139         u16           value;
 140 };
 141
 142 /*
 143  * Values used at the original driver
 144  * Some values are marked as Reserved at the datasheet
 145  */
 146 static const struct i2c_reg_value mt9v011_init_default[] = {
 147                 { R0D_MT9V011_RESET, 0x0001 },
 148                 { R0D_MT9V011_RESET, 0x0000 },
 149
 150                 { R0C_MT9V011_SHUTTER_DELAY, 0x0000 },
 151                 { R09_MT9V011_SHUTTER_WIDTH, 0x1fc },
 152
 153                 { R0A_MT9V011_CLK_SPEED, 0x0000 },
 154                 { R1E_MT9V011_DIGITAL_ZOOM,  0x0000 },
 155
 156                 { R07_MT9V011_OUT_CTRL, 0x0002 },       /* chip enable */
 157 };
 158
 159 static void set_balance(struct v4l2_subdev *sd)
 160 {
 161         struct mt9v011 *core = to_mt9v011(sd);
 162         u16 green1_gain, green2_gain, blue_gain, red_gain;
 163
 164         green1_gain = core->global_gain;
 165         green2_gain = core->global_gain;
 166
 167         blue_gain = core->global_gain +
 168                     core->global_gain * core->blue_bal / (1 << 9);
 169
 170         red_gain = core->global_gain +
 171                    core->global_gain * core->blue_bal / (1 << 9);
 172
 173         mt9v011_write(sd, R2B_MT9V011_GREEN_1_GAIN, green1_gain);
 174         mt9v011_write(sd, R2E_MT9V011_GREEN_2_GAIN,  green1_gain);
 175         mt9v011_write(sd, R2C_MT9V011_BLUE_GAIN, blue_gain);
 176         mt9v011_write(sd, R2D_MT9V011_RED_GAIN, red_gain);
 177 }
 178
 179 static void calc_fps(struct v4l2_subdev *sd, u32 *numerator, u32 *denominator)
 180 {
 181         struct mt9v011 *core = to_mt9v011(sd);
 182         unsigned height, width, hblank, vblank, speed;
 183         unsigned row_time, t_time;
 184         u64 frames_per_ms;
 185         unsigned tmp;
 186
 187         height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
 188         width = mt9v011_read(sd, R04_MT9V011_WIDTH);
 189         hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
 190         vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
 191         speed = mt9v011_read(sd, R0A_MT9V011_CLK_SPEED);
 192
 193         row_time = (width + 113 + hblank) * (speed + 2);
 194         t_time = row_time * (height + vblank + 1);
 195
 196         frames_per_ms = core->xtal * 1000l;
 197         do_div(frames_per_ms, t_time);
 198         tmp = frames_per_ms;
 199
 200         v4l2_dbg(1, debug, sd, "Programmed to %u.%03u fps (%d pixel clcks)\n",
 201                 tmp / 1000, tmp % 1000, t_time);
 202
 203         if (numerator && denominator) {
 204                 *numerator = 1000;
 205                 *denominator = (u32)frames_per_ms;
 206         }
 207 }
 208
 209 static u16 calc_speed(struct v4l2_subdev *sd, u32 numerator, u32 denominator)
 210 {
 211         struct mt9v011 *core = to_mt9v011(sd);
 212         unsigned height, width, hblank, vblank;
 213         unsigned row_time, line_time;
 214         u64 t_time, speed;
 215
 216         /* Avoid bogus calculus */
 217         if (!numerator || !denominator)
 218                 return 0;
 219
 220         height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
 221         width = mt9v011_read(sd, R04_MT9V011_WIDTH);
 222         hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
 223         vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
 224
 225         row_time = width + 113 + hblank;
 226         line_time = height + vblank + 1;
 227
 228         t_time = core->xtal * ((u64)numerator);
 229         /* round to the closest value */
 230         t_time += denominator / 2;
 231         do_div(t_time, denominator);
 232
 233         speed = t_time;
 234         do_div(speed, row_time * line_time);
 235
 236         /* Avoid having a negative value for speed */
 237         if (speed < 2)
 238                 speed = 0;
 239         else
 240                 speed -= 2;
 241
 242         /* Avoid speed overflow */
 243         if (speed > 15)
 244                 return 15;
 245
 246         return (u16)speed;
 247 }
 248
 249 static void set_res(struct v4l2_subdev *sd)
 250 {
 251         struct mt9v011 *core = to_mt9v011(sd);
 252         unsigned vstart, hstart;
 253
 254         /*
 255          * The mt9v011 doesn't have scaling. So, in order to select the desired
 256          * resolution, we're cropping at the middle of the sensor.
 257          * hblank and vblank should be adjusted, in order to warrant that
 258          * we'll preserve the line timings for 30 fps, no matter what resolution
 259          * is selected.
 260          * NOTE: datasheet says that width (and height) should be filled with
 261          * width-1. However, this doesn't work, since one pixel per line will
 262          * be missing.
 263          */
 264
 265         hstart = 14 + (640 - core->width) / 2;
 266         mt9v011_write(sd, R02_MT9V011_COLSTART, hstart);
 267         mt9v011_write(sd, R04_MT9V011_WIDTH, core->width);
 268         mt9v011_write(sd, R05_MT9V011_HBLANK, 771 - core->width);
 269
 270         vstart = 8 + (480 - core->height) / 2;
 271         mt9v011_write(sd, R01_MT9V011_ROWSTART, vstart);
 272         mt9v011_write(sd, R03_MT9V011_HEIGHT, core->height);
 273         mt9v011_write(sd, R06_MT9V011_VBLANK, 508 - core->height);
 274
 275         calc_fps(sd, NULL, NULL);
 276 };
 277
 278 static void set_read_mode(struct v4l2_subdev *sd)
 279 {
 280         struct mt9v011 *core = to_mt9v011(sd);
 281         unsigned mode = 0x1000;
 282
 283         if (core->hflip)
 284                 mode |= 0x4000;
 285
 286         if (core->vflip)
 287                 mode |= 0x8000;
 288
 289         mt9v011_write(sd, R20_MT9V011_READ_MODE, mode);
 290 }
 291
 292 static int mt9v011_reset(struct v4l2_subdev *sd, u32 val)
 293 {
 294         int i;
 295
 296         for (i = 0; i < ARRAY_SIZE(mt9v011_init_default); i++)
 297                 mt9v011_write(sd, mt9v011_init_default[i].reg,
 298                                mt9v011_init_default[i].value);
 299
 300         set_balance(sd);
 301         set_res(sd);
 302         set_read_mode(sd);
 303
 304         return 0;
 305 };
 306
 307 static int mt9v011_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 308 {
 309         struct mt9v011 *core = to_mt9v011(sd);
 310
 311         v4l2_dbg(1, debug, sd, "g_ctrl called\n");
 312
 313         switch (ctrl->id) {
 314         case V4L2_CID_GAIN:
 315                 ctrl->value = core->global_gain;
 316                 return 0;
 317         case V4L2_CID_RED_BALANCE:
 318                 ctrl->value = core->red_bal;
 319                 return 0;
 320         case V4L2_CID_BLUE_BALANCE:
 321                 ctrl->value = core->blue_bal;
 322                 return 0;
 323         case V4L2_CID_HFLIP:
 324                 ctrl->value = core->hflip ? 1 : 0;
 325                 return 0;
 326         case V4L2_CID_VFLIP:
 327                 ctrl->value = core->vflip ? 1 : 0;
 328                 return 0;
 329         }
 330         return -EINVAL;
 331 }
 332
 333 static int mt9v011_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
 334 {
 335         int i;
 336
 337         v4l2_dbg(1, debug, sd, "queryctrl called\n");
 338
 339         for (i = 0; i < ARRAY_SIZE(mt9v011_qctrl); i++)
 340                 if (qc->id && qc->id == mt9v011_qctrl[i].id) {
 341                         memcpy(qc, &(mt9v011_qctrl[i]),
 342                                sizeof(*qc));
 343                         return 0;
 344                 }
 345
 346         return -EINVAL;
 347 }
 348
 349
 350 static int mt9v011_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 351 {
 352         struct mt9v011 *core = to_mt9v011(sd);
 353         u8 i, n;
 354         n = ARRAY_SIZE(mt9v011_qctrl);
 355
 356         for (i = 0; i < n; i++) {
 357                 if (ctrl->id != mt9v011_qctrl[i].id)
 358                         continue;
 359                 if (ctrl->value < mt9v011_qctrl[i].minimum ||
 360                     ctrl->value > mt9v011_qctrl[i].maximum)
 361                         return -ERANGE;
 362                 v4l2_dbg(1, debug, sd, "s_ctrl: id=%d, value=%d\n",
 363                                         ctrl->id, ctrl->value);
 364                 break;
 365         }
 366
 367         switch (ctrl->id) {
 368         case V4L2_CID_GAIN:
 369                 core->global_gain = ctrl->value;
 370                 break;
 371         case V4L2_CID_RED_BALANCE:
 372                 core->red_bal = ctrl->value;
 373                 break;
 374         case V4L2_CID_BLUE_BALANCE:
 375                 core->blue_bal = ctrl->value;
 376                 break;
 377         case V4L2_CID_HFLIP:
 378                 core->hflip = ctrl->value;
 379                 set_read_mode(sd);
 380                 return 0;
 381         case V4L2_CID_VFLIP:
 382                 core->vflip = ctrl->value;
 383                 set_read_mode(sd);
 384                 return 0;
 385         default:
 386                 return -EINVAL;
 387         }
 388
 389         set_balance(sd);
 390
 391         return 0;
 392 }
 393
 394 static int mt9v011_enum_mbus_fmt(struct v4l2_subdev *sd, unsigned index,
 395                                         enum v4l2_mbus_pixelcode *code)
 396 {
 397         if (index > 0)
 398                 return -EINVAL;
 399
 400         *code = V4L2_MBUS_FMT_SGRBG8_1X8;
 401         return 0;
 402 }
 403
 404 static int mt9v011_try_mbus_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *fmt)
 405 {
 406         if (fmt->code != V4L2_MBUS_FMT_SGRBG8_1X8)
 407                 return -EINVAL;
 408
 409         v4l_bound_align_image(&fmt->width, 48, 639, 1,
 410                               &fmt->height, 32, 480, 1, 0);
 411         fmt->field = V4L2_FIELD_NONE;
 412         fmt->colorspace = V4L2_COLORSPACE_SRGB;
 413
 414         return 0;
 415 }
 416
 417 static int mt9v011_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
 418 {
 419         struct v4l2_captureparm *cp = &parms->parm.capture;
 420
 421         if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 422                 return -EINVAL;
 423
 424         memset(cp, 0, sizeof(struct v4l2_captureparm));
 425         cp->capability = V4L2_CAP_TIMEPERFRAME;
 426         calc_fps(sd,
 427                  &cp->timeperframe.numerator,
 428                  &cp->timeperframe.denominator);
 429
 430         return 0;
 431 }
 432
 433 static int mt9v011_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
 434 {
 435         struct v4l2_captureparm *cp = &parms->parm.capture;
 436         struct v4l2_fract *tpf = &cp->timeperframe;
 437         u16 speed;
 438
 439         if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 440                 return -EINVAL;
 441         if (cp->extendedmode != 0)
 442                 return -EINVAL;
 443
 444         speed = calc_speed(sd, tpf->numerator, tpf->denominator);
 445
 446         mt9v011_write(sd, R0A_MT9V011_CLK_SPEED, speed);
 447         v4l2_dbg(1, debug, sd, "Setting speed to %d\n", speed);
 448
 449         /* Recalculate and update fps info */
 450         calc_fps(sd, &tpf->numerator, &tpf->denominator);
 451
 452         return 0;
 453 }
 454
 455 static int mt9v011_s_mbus_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *fmt)
 456 {
 457         struct mt9v011 *core = to_mt9v011(sd);
 458         int rc;
 459
 460         rc = mt9v011_try_mbus_fmt(sd, fmt);
 461         if (rc < 0)
 462                 return -EINVAL;
 463
 464         core->width = fmt->width;
 465         core->height = fmt->height;
 466
 467         set_res(sd);
 468
 469         return 0;
 470 }
 471
 472 static int mt9v011_s_config(struct v4l2_subdev *sd, int dumb, void *data)
 473 {
 474         struct mt9v011 *core = to_mt9v011(sd);
 475         unsigned *xtal = data;
 476
 477         v4l2_dbg(1, debug, sd, "s_config called\n");
 478
 479         if (xtal) {
 480                 core->xtal = *xtal;
 481                 v4l2_dbg(1, debug, sd, "xtal set to %d.%03d MHz\n",
 482                          *xtal / 1000000, (*xtal / 1000) % 1000);
 483         }
 484
 485         return 0;
 486 }
 487
 488
 489 #ifdef CONFIG_VIDEO_ADV_DEBUG
 490 static int mt9v011_g_register(struct v4l2_subdev *sd,
 491                               struct v4l2_dbg_register *reg)
 492 {
 493         struct i2c_client *client = v4l2_get_subdevdata(sd);
 494
 495         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 496                 return -EINVAL;
 497         if (!capable(CAP_SYS_ADMIN))
 498                 return -EPERM;
 499
 500         reg->val = mt9v011_read(sd, reg->reg & 0xff);
 501         reg->size = 2;
 502
 503         return 0;
 504 }
 505
 506 static int mt9v011_s_register(struct v4l2_subdev *sd,
 507                               struct v4l2_dbg_register *reg)
 508 {
 509         struct i2c_client *client = v4l2_get_subdevdata(sd);
 510
 511         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 512                 return -EINVAL;
 513         if (!capable(CAP_SYS_ADMIN))
 514                 return -EPERM;
 515
 516         mt9v011_write(sd, reg->reg & 0xff, reg->val & 0xffff);
 517
 518         return 0;
 519 }
 520 #endif
 521
 522 static int mt9v011_g_chip_ident(struct v4l2_subdev *sd,
 523                                 struct v4l2_dbg_chip_ident *chip)
 524 {
 525         u16 version;
 526         struct i2c_client *client = v4l2_get_subdevdata(sd);
 527
 528         version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION);
 529
 530         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_MT9V011,
 531                                           version);
 532 }
 533
 534 static const struct v4l2_subdev_core_ops mt9v011_core_ops = {
 535         .queryctrl = mt9v011_queryctrl,
 536         .g_ctrl = mt9v011_g_ctrl,
 537         .s_ctrl = mt9v011_s_ctrl,
 538         .reset = mt9v011_reset,
 539         .s_config = mt9v011_s_config,
 540         .g_chip_ident = mt9v011_g_chip_ident,
 541 #ifdef CONFIG_VIDEO_ADV_DEBUG
 542         .g_register = mt9v011_g_register,
 543         .s_register = mt9v011_s_register,
 544 #endif
 545 };
 546
 547 static const struct v4l2_subdev_video_ops mt9v011_video_ops = {
 548         .enum_mbus_fmt = mt9v011_enum_mbus_fmt,
 549         .try_mbus_fmt = mt9v011_try_mbus_fmt,
 550         .s_mbus_fmt = mt9v011_s_mbus_fmt,
 551         .g_parm = mt9v011_g_parm,
 552         .s_parm = mt9v011_s_parm,
 553 };
 554
 555 static const struct v4l2_subdev_ops mt9v011_ops = {
 556         .core  = &mt9v011_core_ops,
 557         .video = &mt9v011_video_ops,
 558 };
 559
 560
 561 /****************************************************************************
 562                         I2C Client & Driver
 563  ****************************************************************************/
 564
 565 static int mt9v011_probe(struct i2c_client *c,
 566                          const struct i2c_device_id *id)
 567 {
 568         u16 version;
 569         struct mt9v011 *core;
 570         struct v4l2_subdev *sd;
 571
 572         /* Check if the adapter supports the needed features */
 573         if (!i2c_check_functionality(c->adapter,
 574              I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 575                 return -EIO;
 576
 577         core = kzalloc(sizeof(struct mt9v011), GFP_KERNEL);
 578         if (!core)
 579                 return -ENOMEM;
 580
 581         sd = &core->sd;
 582         v4l2_i2c_subdev_init(sd, c, &mt9v011_ops);
 583
 584         /* Check if the sensor is really a MT9V011 */
 585         version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION);
 586         if ((version != MT9V011_VERSION) &&
 587             (version != MT9V011_REV_B_VERSION)) {
 588                 v4l2_info(sd, "*** unknown micron chip detected (0x%04x).\n",
 589                           version);
 590                 kfree(core);
 591                 return -EINVAL;
 592         }
 593
 594         core->global_gain = 0x0024;
 595         core->width  = 640;
 596         core->height = 480;
 597         core->xtal = 27000000;  /* Hz */
 598
 599         v4l_info(c, "chip found @ 0x%02x (%s - chip version 0x%04x)\n",
 600                  c->addr << 1, c->adapter->name, version);
 601
 602         return 0;
 603 }
 604
 605 static int mt9v011_remove(struct i2c_client *c)
 606 {
 607         struct v4l2_subdev *sd = i2c_get_clientdata(c);
 608
 609         v4l2_dbg(1, debug, sd,
 610                 "mt9v011.c: removing mt9v011 adapter on address 0x%x\n",
 611                 c->addr << 1);
 612
 613         v4l2_device_unregister_subdev(sd);
 614         kfree(to_mt9v011(sd));
 615         return 0;
 616 }
 617
 618 /* ----------------------------------------------------------------------- */
 619
 620 static const struct i2c_device_id mt9v011_id[] = {
 621         { "mt9v011", 0 },
 622         { }
 623 };
 624 MODULE_DEVICE_TABLE(i2c, mt9v011_id);
 625
 626 static struct i2c_driver mt9v011_driver = {
 627         .driver = {
 628                 .owner  = THIS_MODULE,
 629                 .name   = "mt9v011",
 630         },
 631         .probe          = mt9v011_probe,
 632         .remove         = mt9v011_remove,
 633         .id_table       = mt9v011_id,
 634 };
 635
 636 static __init int init_mt9v011(void)
 637 {
 638         return i2c_add_driver(&mt9v011_driver);
 639 }
 640
 641 static __exit void exit_mt9v011(void)
 642 {
 643         i2c_del_driver(&mt9v011_driver);
 644 }
 645
 646 module_init(init_mt9v011);
 647 module_exit(exit_mt9v011);