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 <media/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 static int debug;
  22 module_param(debug, int, 0);
  23 MODULE_PARM_DESC(debug, "Debug level (0-2)");
  24
  25 #define R00_MT9V011_CHIP_VERSION        0x00
  26 #define R01_MT9V011_ROWSTART            0x01
  27 #define R02_MT9V011_COLSTART            0x02
  28 #define R03_MT9V011_HEIGHT              0x03
  29 #define R04_MT9V011_WIDTH               0x04
  30 #define R05_MT9V011_HBLANK              0x05
  31 #define R06_MT9V011_VBLANK              0x06
  32 #define R07_MT9V011_OUT_CTRL            0x07
  33 #define R09_MT9V011_SHUTTER_WIDTH       0x09
  34 #define R0A_MT9V011_CLK_SPEED           0x0a
  35 #define R0B_MT9V011_RESTART             0x0b
  36 #define R0C_MT9V011_SHUTTER_DELAY       0x0c
  37 #define R0D_MT9V011_RESET               0x0d
  38 #define R1E_MT9V011_DIGITAL_ZOOM        0x1e
  39 #define R20_MT9V011_READ_MODE           0x20
  40 #define R2B_MT9V011_GREEN_1_GAIN        0x2b
  41 #define R2C_MT9V011_BLUE_GAIN           0x2c
  42 #define R2D_MT9V011_RED_GAIN            0x2d
  43 #define R2E_MT9V011_GREEN_2_GAIN        0x2e
  44 #define R35_MT9V011_GLOBAL_GAIN         0x35
  45 #define RF1_MT9V011_CHIP_ENABLE         0xf1
  46
  47 #define MT9V011_VERSION                 0x8232
  48 #define MT9V011_REV_B_VERSION           0x8243
  49
  50 /* supported controls */
  51 static struct v4l2_queryctrl mt9v011_qctrl[] = {
  52         {
  53                 .id = V4L2_CID_GAIN,
  54                 .type = V4L2_CTRL_TYPE_INTEGER,
  55                 .name = "Gain",
  56                 .minimum = 0,
  57                 .maximum = (1 << 12) - 1 - 0x0020,
  58                 .step = 1,
  59                 .default_value = 0x0020,
  60                 .flags = 0,
  61         }, {
  62                 .id = V4L2_CID_EXPOSURE,
  63                 .type = V4L2_CTRL_TYPE_INTEGER,
  64                 .name = "Exposure",
  65                 .minimum = 0,
  66                 .maximum = 2047,
  67                 .step = 1,
  68                 .default_value = 0x01fc,
  69                 .flags = 0,
  70         }, {
  71                 .id = V4L2_CID_RED_BALANCE,
  72                 .type = V4L2_CTRL_TYPE_INTEGER,
  73                 .name = "Red Balance",
  74                 .minimum = -1 << 9,
  75                 .maximum = (1 << 9) - 1,
  76                 .step = 1,
  77                 .default_value = 0,
  78                 .flags = 0,
  79         }, {
  80                 .id = V4L2_CID_BLUE_BALANCE,
  81                 .type = V4L2_CTRL_TYPE_INTEGER,
  82                 .name = "Blue Balance",
  83                 .minimum = -1 << 9,
  84                 .maximum = (1 << 9) - 1,
  85                 .step = 1,
  86                 .default_value = 0,
  87                 .flags = 0,
  88         }, {
  89                 .id      = V4L2_CID_HFLIP,
  90                 .type    = V4L2_CTRL_TYPE_BOOLEAN,
  91                 .name    = "Mirror",
  92                 .minimum = 0,
  93                 .maximum = 1,
  94                 .step    = 1,
  95                 .default_value = 0,
  96                 .flags = 0,
  97         }, {
  98                 .id      = V4L2_CID_VFLIP,
  99                 .type    = V4L2_CTRL_TYPE_BOOLEAN,
 100                 .name    = "Vflip",
 101                 .minimum = 0,
 102                 .maximum = 1,
 103                 .step    = 1,
 104                 .default_value = 0,
 105                 .flags = 0,
 106         }, {
 107         }
 108 };
 109
 110 struct mt9v011 {
 111         struct v4l2_subdev sd;
 112         unsigned width, height;
 113         unsigned xtal;
 114         unsigned hflip:1;
 115         unsigned vflip:1;
 116
 117         u16 global_gain, exposure;
 118         s16 red_bal, blue_bal;
 119 };
 120
 121 static inline struct mt9v011 *to_mt9v011(struct v4l2_subdev *sd)
 122 {
 123         return container_of(sd, struct mt9v011, sd);
 124 }
 125
 126 static int mt9v011_read(struct v4l2_subdev *sd, unsigned char addr)
 127 {
 128         struct i2c_client *c = v4l2_get_subdevdata(sd);
 129         __be16 buffer;
 130         int rc, val;
 131
 132         rc = i2c_master_send(c, &addr, 1);
 133         if (rc != 1)
 134                 v4l2_dbg(0, debug, sd,
 135                          "i2c i/o error: rc == %d (should be 1)\n", rc);
 136
 137         msleep(10);
 138
 139         rc = i2c_master_recv(c, (char *)&buffer, 2);
 140         if (rc != 2)
 141                 v4l2_dbg(0, debug, sd,
 142                          "i2c i/o error: rc == %d (should be 2)\n", rc);
 143
 144         val = be16_to_cpu(buffer);
 145
 146         v4l2_dbg(2, debug, sd, "mt9v011: read 0x%02x = 0x%04x\n", addr, val);
 147
 148         return val;
 149 }
 150
 151 static void mt9v011_write(struct v4l2_subdev *sd, unsigned char addr,
 152                                  u16 value)
 153 {
 154         struct i2c_client *c = v4l2_get_subdevdata(sd);
 155         unsigned char buffer[3];
 156         int rc;
 157
 158         buffer[0] = addr;
 159         buffer[1] = value >> 8;
 160         buffer[2] = value & 0xff;
 161
 162         v4l2_dbg(2, debug, sd,
 163                  "mt9v011: writing 0x%02x 0x%04x\n", buffer[0], value);
 164         rc = i2c_master_send(c, buffer, 3);
 165         if (rc != 3)
 166                 v4l2_dbg(0, debug, sd,
 167                          "i2c i/o error: rc == %d (should be 3)\n", rc);
 168 }
 169
 170
 171 struct i2c_reg_value {
 172         unsigned char reg;
 173         u16           value;
 174 };
 175
 176 /*
 177  * Values used at the original driver
 178  * Some values are marked as Reserved at the datasheet
 179  */
 180 static const struct i2c_reg_value mt9v011_init_default[] = {
 181                 { R0D_MT9V011_RESET, 0x0001 },
 182                 { R0D_MT9V011_RESET, 0x0000 },
 183
 184                 { R0C_MT9V011_SHUTTER_DELAY, 0x0000 },
 185                 { R09_MT9V011_SHUTTER_WIDTH, 0x1fc },
 186
 187                 { R0A_MT9V011_CLK_SPEED, 0x0000 },
 188                 { R1E_MT9V011_DIGITAL_ZOOM,  0x0000 },
 189
 190                 { R07_MT9V011_OUT_CTRL, 0x0002 },       /* chip enable */
 191 };
 192
 193
 194 static u16 calc_mt9v011_gain(s16 lineargain)
 195 {
 196
 197         u16 digitalgain = 0;
 198         u16 analogmult = 0;
 199         u16 analoginit = 0;
 200
 201         if (lineargain < 0)
 202                 lineargain = 0;
 203
 204         /* recommended minimum */
 205         lineargain += 0x0020;
 206
 207         if (lineargain > 2047)
 208                 lineargain = 2047;
 209
 210         if (lineargain > 1023) {
 211                 digitalgain = 3;
 212                 analogmult = 3;
 213                 analoginit = lineargain / 16;
 214         } else if (lineargain > 511) {
 215                 digitalgain = 1;
 216                 analogmult = 3;
 217                 analoginit = lineargain / 8;
 218         } else if (lineargain > 255) {
 219                 analogmult = 3;
 220                 analoginit = lineargain / 4;
 221         } else if (lineargain > 127) {
 222                 analogmult = 1;
 223                 analoginit = lineargain / 2;
 224         } else
 225                 analoginit = lineargain;
 226
 227         return analoginit + (analogmult << 7) + (digitalgain << 9);
 228
 229 }
 230
 231 static void set_balance(struct v4l2_subdev *sd)
 232 {
 233         struct mt9v011 *core = to_mt9v011(sd);
 234         u16 green_gain, blue_gain, red_gain;
 235         u16 exposure;
 236         s16 bal;
 237
 238         exposure = core->exposure;
 239
 240         green_gain = calc_mt9v011_gain(core->global_gain);
 241
 242         bal = core->global_gain;
 243         bal += (core->blue_bal * core->global_gain / (1 << 7));
 244         blue_gain = calc_mt9v011_gain(bal);
 245
 246         bal = core->global_gain;
 247         bal += (core->red_bal * core->global_gain / (1 << 7));
 248         red_gain = calc_mt9v011_gain(bal);
 249
 250         mt9v011_write(sd, R2B_MT9V011_GREEN_1_GAIN, green_gain);
 251         mt9v011_write(sd, R2E_MT9V011_GREEN_2_GAIN, green_gain);
 252         mt9v011_write(sd, R2C_MT9V011_BLUE_GAIN, blue_gain);
 253         mt9v011_write(sd, R2D_MT9V011_RED_GAIN, red_gain);
 254         mt9v011_write(sd, R09_MT9V011_SHUTTER_WIDTH, exposure);
 255 }
 256
 257 static void calc_fps(struct v4l2_subdev *sd, u32 *numerator, u32 *denominator)
 258 {
 259         struct mt9v011 *core = to_mt9v011(sd);
 260         unsigned height, width, hblank, vblank, speed;
 261         unsigned row_time, t_time;
 262         u64 frames_per_ms;
 263         unsigned tmp;
 264
 265         height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
 266         width = mt9v011_read(sd, R04_MT9V011_WIDTH);
 267         hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
 268         vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
 269         speed = mt9v011_read(sd, R0A_MT9V011_CLK_SPEED);
 270
 271         row_time = (width + 113 + hblank) * (speed + 2);
 272         t_time = row_time * (height + vblank + 1);
 273
 274         frames_per_ms = core->xtal * 1000l;
 275         do_div(frames_per_ms, t_time);
 276         tmp = frames_per_ms;
 277
 278         v4l2_dbg(1, debug, sd, "Programmed to %u.%03u fps (%d pixel clcks)\n",
 279                 tmp / 1000, tmp % 1000, t_time);
 280
 281         if (numerator && denominator) {
 282                 *numerator = 1000;
 283                 *denominator = (u32)frames_per_ms;
 284         }
 285 }
 286
 287 static u16 calc_speed(struct v4l2_subdev *sd, u32 numerator, u32 denominator)
 288 {
 289         struct mt9v011 *core = to_mt9v011(sd);
 290         unsigned height, width, hblank, vblank;
 291         unsigned row_time, line_time;
 292         u64 t_time, speed;
 293
 294         /* Avoid bogus calculus */
 295         if (!numerator || !denominator)
 296                 return 0;
 297
 298         height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
 299         width = mt9v011_read(sd, R04_MT9V011_WIDTH);
 300         hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
 301         vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
 302
 303         row_time = width + 113 + hblank;
 304         line_time = height + vblank + 1;
 305
 306         t_time = core->xtal * ((u64)numerator);
 307         /* round to the closest value */
 308         t_time += denominator / 2;
 309         do_div(t_time, denominator);
 310
 311         speed = t_time;
 312         do_div(speed, row_time * line_time);
 313
 314         /* Avoid having a negative value for speed */
 315         if (speed < 2)
 316                 speed = 0;
 317         else
 318                 speed -= 2;
 319
 320         /* Avoid speed overflow */
 321         if (speed > 15)
 322                 return 15;
 323
 324         return (u16)speed;
 325 }
 326
 327 static void set_res(struct v4l2_subdev *sd)
 328 {
 329         struct mt9v011 *core = to_mt9v011(sd);
 330         unsigned vstart, hstart;
 331
 332         /*
 333          * The mt9v011 doesn't have scaling. So, in order to select the desired
 334          * resolution, we're cropping at the middle of the sensor.
 335          * hblank and vblank should be adjusted, in order to warrant that
 336          * we'll preserve the line timings for 30 fps, no matter what resolution
 337          * is selected.
 338          * NOTE: datasheet says that width (and height) should be filled with
 339          * width-1. However, this doesn't work, since one pixel per line will
 340          * be missing.
 341          */
 342
 343         hstart = 20 + (640 - core->width) / 2;
 344         mt9v011_write(sd, R02_MT9V011_COLSTART, hstart);
 345         mt9v011_write(sd, R04_MT9V011_WIDTH, core->width);
 346         mt9v011_write(sd, R05_MT9V011_HBLANK, 771 - core->width);
 347
 348         vstart = 8 + (480 - core->height) / 2;
 349         mt9v011_write(sd, R01_MT9V011_ROWSTART, vstart);
 350         mt9v011_write(sd, R03_MT9V011_HEIGHT, core->height);
 351         mt9v011_write(sd, R06_MT9V011_VBLANK, 508 - core->height);
 352
 353         calc_fps(sd, NULL, NULL);
 354 };
 355
 356 static void set_read_mode(struct v4l2_subdev *sd)
 357 {
 358         struct mt9v011 *core = to_mt9v011(sd);
 359         unsigned mode = 0x1000;
 360
 361         if (core->hflip)
 362                 mode |= 0x4000;
 363
 364         if (core->vflip)
 365                 mode |= 0x8000;
 366
 367         mt9v011_write(sd, R20_MT9V011_READ_MODE, mode);
 368 }
 369
 370 static int mt9v011_reset(struct v4l2_subdev *sd, u32 val)
 371 {
 372         int i;
 373
 374         for (i = 0; i < ARRAY_SIZE(mt9v011_init_default); i++)
 375                 mt9v011_write(sd, mt9v011_init_default[i].reg,
 376                                mt9v011_init_default[i].value);
 377
 378         set_balance(sd);
 379         set_res(sd);
 380         set_read_mode(sd);
 381
 382         return 0;
 383 };
 384
 385 static int mt9v011_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 386 {
 387         struct mt9v011 *core = to_mt9v011(sd);
 388
 389         v4l2_dbg(1, debug, sd, "g_ctrl called\n");
 390
 391         switch (ctrl->id) {
 392         case V4L2_CID_GAIN:
 393                 ctrl->value = core->global_gain;
 394                 return 0;
 395         case V4L2_CID_EXPOSURE:
 396                 ctrl->value = core->exposure;
 397                 return 0;
 398         case V4L2_CID_RED_BALANCE:
 399                 ctrl->value = core->red_bal;
 400                 return 0;
 401         case V4L2_CID_BLUE_BALANCE:
 402                 ctrl->value = core->blue_bal;
 403                 return 0;
 404         case V4L2_CID_HFLIP:
 405                 ctrl->value = core->hflip ? 1 : 0;
 406                 return 0;
 407         case V4L2_CID_VFLIP:
 408                 ctrl->value = core->vflip ? 1 : 0;
 409                 return 0;
 410         }
 411         return -EINVAL;
 412 }
 413
 414 static int mt9v011_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
 415 {
 416         int i;
 417
 418         v4l2_dbg(1, debug, sd, "queryctrl called\n");
 419
 420         for (i = 0; i < ARRAY_SIZE(mt9v011_qctrl); i++)
 421                 if (qc->id && qc->id == mt9v011_qctrl[i].id) {
 422                         memcpy(qc, &(mt9v011_qctrl[i]),
 423                                sizeof(*qc));
 424                         return 0;
 425                 }
 426
 427         return -EINVAL;
 428 }
 429
 430
 431 static int mt9v011_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 432 {
 433         struct mt9v011 *core = to_mt9v011(sd);
 434         u8 i, n;
 435         n = ARRAY_SIZE(mt9v011_qctrl);
 436
 437         for (i = 0; i < n; i++) {
 438                 if (ctrl->id != mt9v011_qctrl[i].id)
 439                         continue;
 440                 if (ctrl->value < mt9v011_qctrl[i].minimum ||
 441                     ctrl->value > mt9v011_qctrl[i].maximum)
 442                         return -ERANGE;
 443                 v4l2_dbg(1, debug, sd, "s_ctrl: id=%d, value=%d\n",
 444                                         ctrl->id, ctrl->value);
 445                 break;
 446         }
 447
 448         switch (ctrl->id) {
 449         case V4L2_CID_GAIN:
 450                 core->global_gain = ctrl->value;
 451                 break;
 452         case V4L2_CID_EXPOSURE:
 453                 core->exposure = ctrl->value;
 454                 break;
 455         case V4L2_CID_RED_BALANCE:
 456                 core->red_bal = ctrl->value;
 457                 break;
 458         case V4L2_CID_BLUE_BALANCE:
 459                 core->blue_bal = ctrl->value;
 460                 break;
 461         case V4L2_CID_HFLIP:
 462                 core->hflip = ctrl->value;
 463                 set_read_mode(sd);
 464                 return 0;
 465         case V4L2_CID_VFLIP:
 466                 core->vflip = ctrl->value;
 467                 set_read_mode(sd);
 468                 return 0;
 469         default:
 470                 return -EINVAL;
 471         }
 472
 473         set_balance(sd);
 474
 475         return 0;
 476 }
 477
 478 static int mt9v011_enum_mbus_fmt(struct v4l2_subdev *sd, unsigned index,
 479                                         enum v4l2_mbus_pixelcode *code)
 480 {
 481         if (index > 0)
 482                 return -EINVAL;
 483
 484         *code = V4L2_MBUS_FMT_SGRBG8_1X8;
 485         return 0;
 486 }
 487
 488 static int mt9v011_try_mbus_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *fmt)
 489 {
 490         if (fmt->code != V4L2_MBUS_FMT_SGRBG8_1X8)
 491                 return -EINVAL;
 492
 493         v4l_bound_align_image(&fmt->width, 48, 639, 1,
 494                               &fmt->height, 32, 480, 1, 0);
 495         fmt->field = V4L2_FIELD_NONE;
 496         fmt->colorspace = V4L2_COLORSPACE_SRGB;
 497
 498         return 0;
 499 }
 500
 501 static int mt9v011_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
 502 {
 503         struct v4l2_captureparm *cp = &parms->parm.capture;
 504
 505         if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 506                 return -EINVAL;
 507
 508         memset(cp, 0, sizeof(struct v4l2_captureparm));
 509         cp->capability = V4L2_CAP_TIMEPERFRAME;
 510         calc_fps(sd,
 511                  &cp->timeperframe.numerator,
 512                  &cp->timeperframe.denominator);
 513
 514         return 0;
 515 }
 516
 517 static int mt9v011_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
 518 {
 519         struct v4l2_captureparm *cp = &parms->parm.capture;
 520         struct v4l2_fract *tpf = &cp->timeperframe;
 521         u16 speed;
 522
 523         if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 524                 return -EINVAL;
 525         if (cp->extendedmode != 0)
 526                 return -EINVAL;
 527
 528         speed = calc_speed(sd, tpf->numerator, tpf->denominator);
 529
 530         mt9v011_write(sd, R0A_MT9V011_CLK_SPEED, speed);
 531         v4l2_dbg(1, debug, sd, "Setting speed to %d\n", speed);
 532
 533         /* Recalculate and update fps info */
 534         calc_fps(sd, &tpf->numerator, &tpf->denominator);
 535
 536         return 0;
 537 }
 538
 539 static int mt9v011_s_mbus_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *fmt)
 540 {
 541         struct mt9v011 *core = to_mt9v011(sd);
 542         int rc;
 543
 544         rc = mt9v011_try_mbus_fmt(sd, fmt);
 545         if (rc < 0)
 546                 return -EINVAL;
 547
 548         core->width = fmt->width;
 549         core->height = fmt->height;
 550
 551         set_res(sd);
 552
 553         return 0;
 554 }
 555
 556 #ifdef CONFIG_VIDEO_ADV_DEBUG
 557 static int mt9v011_g_register(struct v4l2_subdev *sd,
 558                               struct v4l2_dbg_register *reg)
 559 {
 560         struct i2c_client *client = v4l2_get_subdevdata(sd);
 561
 562         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 563                 return -EINVAL;
 564         if (!capable(CAP_SYS_ADMIN))
 565                 return -EPERM;
 566
 567         reg->val = mt9v011_read(sd, reg->reg & 0xff);
 568         reg->size = 2;
 569
 570         return 0;
 571 }
 572
 573 static int mt9v011_s_register(struct v4l2_subdev *sd,
 574                               struct v4l2_dbg_register *reg)
 575 {
 576         struct i2c_client *client = v4l2_get_subdevdata(sd);
 577
 578         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 579                 return -EINVAL;
 580         if (!capable(CAP_SYS_ADMIN))
 581                 return -EPERM;
 582
 583         mt9v011_write(sd, reg->reg & 0xff, reg->val & 0xffff);
 584
 585         return 0;
 586 }
 587 #endif
 588
 589 static int mt9v011_g_chip_ident(struct v4l2_subdev *sd,
 590                                 struct v4l2_dbg_chip_ident *chip)
 591 {
 592         u16 version;
 593         struct i2c_client *client = v4l2_get_subdevdata(sd);
 594
 595         version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION);
 596
 597         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_MT9V011,
 598                                           version);
 599 }
 600
 601 static const struct v4l2_subdev_core_ops mt9v011_core_ops = {
 602         .queryctrl = mt9v011_queryctrl,
 603         .g_ctrl = mt9v011_g_ctrl,
 604         .s_ctrl = mt9v011_s_ctrl,
 605         .reset = mt9v011_reset,
 606         .g_chip_ident = mt9v011_g_chip_ident,
 607 #ifdef CONFIG_VIDEO_ADV_DEBUG
 608         .g_register = mt9v011_g_register,
 609         .s_register = mt9v011_s_register,
 610 #endif
 611 };
 612
 613 static const struct v4l2_subdev_video_ops mt9v011_video_ops = {
 614         .enum_mbus_fmt = mt9v011_enum_mbus_fmt,
 615         .try_mbus_fmt = mt9v011_try_mbus_fmt,
 616         .s_mbus_fmt = mt9v011_s_mbus_fmt,
 617         .g_parm = mt9v011_g_parm,
 618         .s_parm = mt9v011_s_parm,
 619 };
 620
 621 static const struct v4l2_subdev_ops mt9v011_ops = {
 622         .core  = &mt9v011_core_ops,
 623         .video = &mt9v011_video_ops,
 624 };
 625
 626
 627 /****************************************************************************
 628                         I2C Client & Driver
 629  ****************************************************************************/
 630
 631 static int mt9v011_probe(struct i2c_client *c,
 632                          const struct i2c_device_id *id)
 633 {
 634         u16 version;
 635         struct mt9v011 *core;
 636         struct v4l2_subdev *sd;
 637
 638         /* Check if the adapter supports the needed features */
 639         if (!i2c_check_functionality(c->adapter,
 640              I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 641                 return -EIO;
 642
 643         core = kzalloc(sizeof(struct mt9v011), GFP_KERNEL);
 644         if (!core)
 645                 return -ENOMEM;
 646
 647         sd = &core->sd;
 648         v4l2_i2c_subdev_init(sd, c, &mt9v011_ops);
 649
 650         /* Check if the sensor is really a MT9V011 */
 651         version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION);
 652         if ((version != MT9V011_VERSION) &&
 653             (version != MT9V011_REV_B_VERSION)) {
 654                 v4l2_info(sd, "*** unknown micron chip detected (0x%04x).\n",
 655                           version);
 656                 kfree(core);
 657                 return -EINVAL;
 658         }
 659
 660         core->global_gain = 0x0024;
 661         core->exposure = 0x01fc;
 662         core->width  = 640;
 663         core->height = 480;
 664         core->xtal = 27000000;  /* Hz */
 665
 666         if (c->dev.platform_data) {
 667                 struct mt9v011_platform_data *pdata = c->dev.platform_data;
 668
 669                 core->xtal = pdata->xtal;
 670                 v4l2_dbg(1, debug, sd, "xtal set to %d.%03d MHz\n",
 671                         core->xtal / 1000000, (core->xtal / 1000) % 1000);
 672         }
 673
 674         v4l_info(c, "chip found @ 0x%02x (%s - chip version 0x%04x)\n",
 675                  c->addr << 1, c->adapter->name, version);
 676
 677         return 0;
 678 }
 679
 680 static int mt9v011_remove(struct i2c_client *c)
 681 {
 682         struct v4l2_subdev *sd = i2c_get_clientdata(c);
 683
 684         v4l2_dbg(1, debug, sd,
 685                 "mt9v011.c: removing mt9v011 adapter on address 0x%x\n",
 686                 c->addr << 1);
 687
 688         v4l2_device_unregister_subdev(sd);
 689         kfree(to_mt9v011(sd));
 690         return 0;
 691 }
 692
 693 /* ----------------------------------------------------------------------- */
 694
 695 static const struct i2c_device_id mt9v011_id[] = {
 696         { "mt9v011", 0 },
 697         { }
 698 };
 699 MODULE_DEVICE_TABLE(i2c, mt9v011_id);
 700
 701 static struct i2c_driver mt9v011_driver = {
 702         .driver = {
 703                 .owner  = THIS_MODULE,
 704                 .name   = "mt9v011",
 705         },
 706         .probe          = mt9v011_probe,
 707         .remove         = mt9v011_remove,
 708         .id_table       = mt9v011_id,
 709 };
 710
 711 static __init int init_mt9v011(void)
 712 {
 713         return i2c_add_driver(&mt9v011_driver);
 714 }
 715
 716 static __exit void exit_mt9v011(void)
 717 {
 718         i2c_del_driver(&mt9v011_driver);
 719 }
 720
 721 module_init(init_mt9v011);
 722 module_exit(exit_mt9v011);