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 <linux/module.h>
  13 #include <asm/div64.h>
  14 #include <media/v4l2-device.h>
  15 #include <media/v4l2-chip-ident.h>
  16 #include <media/mt9v011.h>
  17
  18 MODULE_DESCRIPTION("Micron mt9v011 sensor driver");
  19 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
  20 MODULE_LICENSE("GPL");
  21
  22 static int debug;
  23 module_param(debug, int, 0);
  24 MODULE_PARM_DESC(debug, "Debug level (0-2)");
  25
  26 #define R00_MT9V011_CHIP_VERSION        0x00
  27 #define R01_MT9V011_ROWSTART            0x01
  28 #define R02_MT9V011_COLSTART            0x02
  29 #define R03_MT9V011_HEIGHT              0x03
  30 #define R04_MT9V011_WIDTH               0x04
  31 #define R05_MT9V011_HBLANK              0x05
  32 #define R06_MT9V011_VBLANK              0x06
  33 #define R07_MT9V011_OUT_CTRL            0x07
  34 #define R09_MT9V011_SHUTTER_WIDTH       0x09
  35 #define R0A_MT9V011_CLK_SPEED           0x0a
  36 #define R0B_MT9V011_RESTART             0x0b
  37 #define R0C_MT9V011_SHUTTER_DELAY       0x0c
  38 #define R0D_MT9V011_RESET               0x0d
  39 #define R1E_MT9V011_DIGITAL_ZOOM        0x1e
  40 #define R20_MT9V011_READ_MODE           0x20
  41 #define R2B_MT9V011_GREEN_1_GAIN        0x2b
  42 #define R2C_MT9V011_BLUE_GAIN           0x2c
  43 #define R2D_MT9V011_RED_GAIN            0x2d
  44 #define R2E_MT9V011_GREEN_2_GAIN        0x2e
  45 #define R35_MT9V011_GLOBAL_GAIN         0x35
  46 #define RF1_MT9V011_CHIP_ENABLE         0xf1
  47
  48 #define MT9V011_VERSION                 0x8232
  49 #define MT9V011_REV_B_VERSION           0x8243
  50
  51 /* supported controls */
  52 static struct v4l2_queryctrl mt9v011_qctrl[] = {
  53         {
  54                 .id = V4L2_CID_GAIN,
  55                 .type = V4L2_CTRL_TYPE_INTEGER,
  56                 .name = "Gain",
  57                 .minimum = 0,
  58                 .maximum = (1 << 12) - 1 - 0x0020,
  59                 .step = 1,
  60                 .default_value = 0x0020,
  61                 .flags = 0,
  62         }, {
  63                 .id = V4L2_CID_EXPOSURE,
  64                 .type = V4L2_CTRL_TYPE_INTEGER,
  65                 .name = "Exposure",
  66                 .minimum = 0,
  67                 .maximum = 2047,
  68                 .step = 1,
  69                 .default_value = 0x01fc,
  70                 .flags = 0,
  71         }, {
  72                 .id = V4L2_CID_RED_BALANCE,
  73                 .type = V4L2_CTRL_TYPE_INTEGER,
  74                 .name = "Red Balance",
  75                 .minimum = -1 << 9,
  76                 .maximum = (1 << 9) - 1,
  77                 .step = 1,
  78                 .default_value = 0,
  79                 .flags = 0,
  80         }, {
  81                 .id = V4L2_CID_BLUE_BALANCE,
  82                 .type = V4L2_CTRL_TYPE_INTEGER,
  83                 .name = "Blue Balance",
  84                 .minimum = -1 << 9,
  85                 .maximum = (1 << 9) - 1,
  86                 .step = 1,
  87                 .default_value = 0,
  88                 .flags = 0,
  89         }, {
  90                 .id      = V4L2_CID_HFLIP,
  91                 .type    = V4L2_CTRL_TYPE_BOOLEAN,
  92                 .name    = "Mirror",
  93                 .minimum = 0,
  94                 .maximum = 1,
  95                 .step    = 1,
  96                 .default_value = 0,
  97                 .flags = 0,
  98         }, {
  99                 .id      = V4L2_CID_VFLIP,
 100                 .type    = V4L2_CTRL_TYPE_BOOLEAN,
 101                 .name    = "Vflip",
 102                 .minimum = 0,
 103                 .maximum = 1,
 104                 .step    = 1,
 105                 .default_value = 0,
 106                 .flags = 0,
 107         }, {
 108         }
 109 };
 110
 111 struct mt9v011 {
 112         struct v4l2_subdev sd;
 113         unsigned width, height;
 114         unsigned xtal;
 115         unsigned hflip:1;
 116         unsigned vflip:1;
 117
 118         u16 global_gain, exposure;
 119         s16 red_bal, blue_bal;
 120 };
 121
 122 static inline struct mt9v011 *to_mt9v011(struct v4l2_subdev *sd)
 123 {
 124         return container_of(sd, struct mt9v011, sd);
 125 }
 126
 127 static int mt9v011_read(struct v4l2_subdev *sd, unsigned char addr)
 128 {
 129         struct i2c_client *c = v4l2_get_subdevdata(sd);
 130         __be16 buffer;
 131         int rc, val;
 132
 133         rc = i2c_master_send(c, &addr, 1);
 134         if (rc != 1)
 135                 v4l2_dbg(0, debug, sd,
 136                          "i2c i/o error: rc == %d (should be 1)\n", rc);
 137
 138         msleep(10);
 139
 140         rc = i2c_master_recv(c, (char *)&buffer, 2);
 141         if (rc != 2)
 142                 v4l2_dbg(0, debug, sd,
 143                          "i2c i/o error: rc == %d (should be 2)\n", rc);
 144
 145         val = be16_to_cpu(buffer);
 146
 147         v4l2_dbg(2, debug, sd, "mt9v011: read 0x%02x = 0x%04x\n", addr, val);
 148
 149         return val;
 150 }
 151
 152 static void mt9v011_write(struct v4l2_subdev *sd, unsigned char addr,
 153                                  u16 value)
 154 {
 155         struct i2c_client *c = v4l2_get_subdevdata(sd);
 156         unsigned char buffer[3];
 157         int rc;
 158
 159         buffer[0] = addr;
 160         buffer[1] = value >> 8;
 161         buffer[2] = value & 0xff;
 162
 163         v4l2_dbg(2, debug, sd,
 164                  "mt9v011: writing 0x%02x 0x%04x\n", buffer[0], value);
 165         rc = i2c_master_send(c, buffer, 3);
 166         if (rc != 3)
 167                 v4l2_dbg(0, debug, sd,
 168                          "i2c i/o error: rc == %d (should be 3)\n", rc);
 169 }
 170
 171
 172 struct i2c_reg_value {
 173         unsigned char reg;
 174         u16           value;
 175 };
 176
 177 /*
 178  * Values used at the original driver
 179  * Some values are marked as Reserved at the datasheet
 180  */
 181 static const struct i2c_reg_value mt9v011_init_default[] = {
 182                 { R0D_MT9V011_RESET, 0x0001 },
 183                 { R0D_MT9V011_RESET, 0x0000 },
 184
 185                 { R0C_MT9V011_SHUTTER_DELAY, 0x0000 },
 186                 { R09_MT9V011_SHUTTER_WIDTH, 0x1fc },
 187
 188                 { R0A_MT9V011_CLK_SPEED, 0x0000 },
 189                 { R1E_MT9V011_DIGITAL_ZOOM,  0x0000 },
 190
 191                 { R07_MT9V011_OUT_CTRL, 0x0002 },       /* chip enable */
 192 };
 193
 194
 195 static u16 calc_mt9v011_gain(s16 lineargain)
 196 {
 197
 198         u16 digitalgain = 0;
 199         u16 analogmult = 0;
 200         u16 analoginit = 0;
 201
 202         if (lineargain < 0)
 203                 lineargain = 0;
 204
 205         /* recommended minimum */
 206         lineargain += 0x0020;
 207
 208         if (lineargain > 2047)
 209                 lineargain = 2047;
 210
 211         if (lineargain > 1023) {
 212                 digitalgain = 3;
 213                 analogmult = 3;
 214                 analoginit = lineargain / 16;
 215         } else if (lineargain > 511) {
 216                 digitalgain = 1;
 217                 analogmult = 3;
 218                 analoginit = lineargain / 8;
 219         } else if (lineargain > 255) {
 220                 analogmult = 3;
 221                 analoginit = lineargain / 4;
 222         } else if (lineargain > 127) {
 223                 analogmult = 1;
 224                 analoginit = lineargain / 2;
 225         } else
 226                 analoginit = lineargain;
 227
 228         return analoginit + (analogmult << 7) + (digitalgain << 9);
 229
 230 }
 231
 232 static void set_balance(struct v4l2_subdev *sd)
 233 {
 234         struct mt9v011 *core = to_mt9v011(sd);
 235         u16 green_gain, blue_gain, red_gain;
 236         u16 exposure;
 237         s16 bal;
 238
 239         exposure = core->exposure;
 240
 241         green_gain = calc_mt9v011_gain(core->global_gain);
 242
 243         bal = core->global_gain;
 244         bal += (core->blue_bal * core->global_gain / (1 << 7));
 245         blue_gain = calc_mt9v011_gain(bal);
 246
 247         bal = core->global_gain;
 248         bal += (core->red_bal * core->global_gain / (1 << 7));
 249         red_gain = calc_mt9v011_gain(bal);
 250
 251         mt9v011_write(sd, R2B_MT9V011_GREEN_1_GAIN, green_gain);
 252         mt9v011_write(sd, R2E_MT9V011_GREEN_2_GAIN, green_gain);
 253         mt9v011_write(sd, R2C_MT9V011_BLUE_GAIN, blue_gain);
 254         mt9v011_write(sd, R2D_MT9V011_RED_GAIN, red_gain);
 255         mt9v011_write(sd, R09_MT9V011_SHUTTER_WIDTH, exposure);
 256 }
 257
 258 static void calc_fps(struct v4l2_subdev *sd, u32 *numerator, u32 *denominator)
 259 {
 260         struct mt9v011 *core = to_mt9v011(sd);
 261         unsigned height, width, hblank, vblank, speed;
 262         unsigned row_time, t_time;
 263         u64 frames_per_ms;
 264         unsigned tmp;
 265
 266         height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
 267         width = mt9v011_read(sd, R04_MT9V011_WIDTH);
 268         hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
 269         vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
 270         speed = mt9v011_read(sd, R0A_MT9V011_CLK_SPEED);
 271
 272         row_time = (width + 113 + hblank) * (speed + 2);
 273         t_time = row_time * (height + vblank + 1);
 274
 275         frames_per_ms = core->xtal * 1000l;
 276         do_div(frames_per_ms, t_time);
 277         tmp = frames_per_ms;
 278
 279         v4l2_dbg(1, debug, sd, "Programmed to %u.%03u fps (%d pixel clcks)\n",
 280                 tmp / 1000, tmp % 1000, t_time);
 281
 282         if (numerator && denominator) {
 283                 *numerator = 1000;
 284                 *denominator = (u32)frames_per_ms;
 285         }
 286 }
 287
 288 static u16 calc_speed(struct v4l2_subdev *sd, u32 numerator, u32 denominator)
 289 {
 290         struct mt9v011 *core = to_mt9v011(sd);
 291         unsigned height, width, hblank, vblank;
 292         unsigned row_time, line_time;
 293         u64 t_time, speed;
 294
 295         /* Avoid bogus calculus */
 296         if (!numerator || !denominator)
 297                 return 0;
 298
 299         height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
 300         width = mt9v011_read(sd, R04_MT9V011_WIDTH);
 301         hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
 302         vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
 303
 304         row_time = width + 113 + hblank;
 305         line_time = height + vblank + 1;
 306
 307         t_time = core->xtal * ((u64)numerator);
 308         /* round to the closest value */
 309         t_time += denominator / 2;
 310         do_div(t_time, denominator);
 311
 312         speed = t_time;
 313         do_div(speed, row_time * line_time);
 314
 315         /* Avoid having a negative value for speed */
 316         if (speed < 2)
 317                 speed = 0;
 318         else
 319                 speed -= 2;
 320
 321         /* Avoid speed overflow */
 322         if (speed > 15)
 323                 return 15;
 324
 325         return (u16)speed;
 326 }
 327
 328 static void set_res(struct v4l2_subdev *sd)
 329 {
 330         struct mt9v011 *core = to_mt9v011(sd);
 331         unsigned vstart, hstart;
 332
 333         /*
 334          * The mt9v011 doesn't have scaling. So, in order to select the desired
 335          * resolution, we're cropping at the middle of the sensor.
 336          * hblank and vblank should be adjusted, in order to warrant that
 337          * we'll preserve the line timings for 30 fps, no matter what resolution
 338          * is selected.
 339          * NOTE: datasheet says that width (and height) should be filled with
 340          * width-1. However, this doesn't work, since one pixel per line will
 341          * be missing.
 342          */
 343
 344         hstart = 20 + (640 - core->width) / 2;
 345         mt9v011_write(sd, R02_MT9V011_COLSTART, hstart);
 346         mt9v011_write(sd, R04_MT9V011_WIDTH, core->width);
 347         mt9v011_write(sd, R05_MT9V011_HBLANK, 771 - core->width);
 348
 349         vstart = 8 + (480 - core->height) / 2;
 350         mt9v011_write(sd, R01_MT9V011_ROWSTART, vstart);
 351         mt9v011_write(sd, R03_MT9V011_HEIGHT, core->height);
 352         mt9v011_write(sd, R06_MT9V011_VBLANK, 508 - core->height);
 353
 354         calc_fps(sd, NULL, NULL);
 355 };
 356
 357 static void set_read_mode(struct v4l2_subdev *sd)
 358 {
 359         struct mt9v011 *core = to_mt9v011(sd);
 360         unsigned mode = 0x1000;
 361
 362         if (core->hflip)
 363                 mode |= 0x4000;
 364
 365         if (core->vflip)
 366                 mode |= 0x8000;
 367
 368         mt9v011_write(sd, R20_MT9V011_READ_MODE, mode);
 369 }
 370
 371 static int mt9v011_reset(struct v4l2_subdev *sd, u32 val)
 372 {
 373         int i;
 374
 375         for (i = 0; i < ARRAY_SIZE(mt9v011_init_default); i++)
 376                 mt9v011_write(sd, mt9v011_init_default[i].reg,
 377                                mt9v011_init_default[i].value);
 378
 379         set_balance(sd);
 380         set_res(sd);
 381         set_read_mode(sd);
 382
 383         return 0;
 384 };
 385
 386 static int mt9v011_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 387 {
 388         struct mt9v011 *core = to_mt9v011(sd);
 389
 390         v4l2_dbg(1, debug, sd, "g_ctrl called\n");
 391
 392         switch (ctrl->id) {
 393         case V4L2_CID_GAIN:
 394                 ctrl->value = core->global_gain;
 395                 return 0;
 396         case V4L2_CID_EXPOSURE:
 397                 ctrl->value = core->exposure;
 398                 return 0;
 399         case V4L2_CID_RED_BALANCE:
 400                 ctrl->value = core->red_bal;
 401                 return 0;
 402         case V4L2_CID_BLUE_BALANCE:
 403                 ctrl->value = core->blue_bal;
 404                 return 0;
 405         case V4L2_CID_HFLIP:
 406                 ctrl->value = core->hflip ? 1 : 0;
 407                 return 0;
 408         case V4L2_CID_VFLIP:
 409                 ctrl->value = core->vflip ? 1 : 0;
 410                 return 0;
 411         }
 412         return -EINVAL;
 413 }
 414
 415 static int mt9v011_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
 416 {
 417         int i;
 418
 419         v4l2_dbg(1, debug, sd, "queryctrl called\n");
 420
 421         for (i = 0; i < ARRAY_SIZE(mt9v011_qctrl); i++)
 422                 if (qc->id && qc->id == mt9v011_qctrl[i].id) {
 423                         memcpy(qc, &(mt9v011_qctrl[i]),
 424                                sizeof(*qc));
 425                         return 0;
 426                 }
 427
 428         return -EINVAL;
 429 }
 430
 431
 432 static int mt9v011_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 433 {
 434         struct mt9v011 *core = to_mt9v011(sd);
 435         u8 i, n;
 436         n = ARRAY_SIZE(mt9v011_qctrl);
 437
 438         for (i = 0; i < n; i++) {
 439                 if (ctrl->id != mt9v011_qctrl[i].id)
 440                         continue;
 441                 if (ctrl->value < mt9v011_qctrl[i].minimum ||
 442                     ctrl->value > mt9v011_qctrl[i].maximum)
 443                         return -ERANGE;
 444                 v4l2_dbg(1, debug, sd, "s_ctrl: id=%d, value=%d\n",
 445                                         ctrl->id, ctrl->value);
 446                 break;
 447         }
 448
 449         switch (ctrl->id) {
 450         case V4L2_CID_GAIN:
 451                 core->global_gain = ctrl->value;
 452                 break;
 453         case V4L2_CID_EXPOSURE:
 454                 core->exposure = ctrl->value;
 455                 break;
 456         case V4L2_CID_RED_BALANCE:
 457                 core->red_bal = ctrl->value;
 458                 break;
 459         case V4L2_CID_BLUE_BALANCE:
 460                 core->blue_bal = ctrl->value;
 461                 break;
 462         case V4L2_CID_HFLIP:
 463                 core->hflip = ctrl->value;
 464                 set_read_mode(sd);
 465                 return 0;
 466         case V4L2_CID_VFLIP:
 467                 core->vflip = ctrl->value;
 468                 set_read_mode(sd);
 469                 return 0;
 470         default:
 471                 return -EINVAL;
 472         }
 473
 474         set_balance(sd);
 475
 476         return 0;
 477 }
 478
 479 static int mt9v011_enum_mbus_fmt(struct v4l2_subdev *sd, unsigned index,
 480                                         enum v4l2_mbus_pixelcode *code)
 481 {
 482         if (index > 0)
 483                 return -EINVAL;
 484
 485         *code = V4L2_MBUS_FMT_SGRBG8_1X8;
 486         return 0;
 487 }
 488
 489 static int mt9v011_try_mbus_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *fmt)
 490 {
 491         if (fmt->code != V4L2_MBUS_FMT_SGRBG8_1X8)
 492                 return -EINVAL;
 493
 494         v4l_bound_align_image(&fmt->width, 48, 639, 1,
 495                               &fmt->height, 32, 480, 1, 0);
 496         fmt->field = V4L2_FIELD_NONE;
 497         fmt->colorspace = V4L2_COLORSPACE_SRGB;
 498
 499         return 0;
 500 }
 501
 502 static int mt9v011_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
 503 {
 504         struct v4l2_captureparm *cp = &parms->parm.capture;
 505
 506         if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 507                 return -EINVAL;
 508
 509         memset(cp, 0, sizeof(struct v4l2_captureparm));
 510         cp->capability = V4L2_CAP_TIMEPERFRAME;
 511         calc_fps(sd,
 512                  &cp->timeperframe.numerator,
 513                  &cp->timeperframe.denominator);
 514
 515         return 0;
 516 }
 517
 518 static int mt9v011_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
 519 {
 520         struct v4l2_captureparm *cp = &parms->parm.capture;
 521         struct v4l2_fract *tpf = &cp->timeperframe;
 522         u16 speed;
 523
 524         if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 525                 return -EINVAL;
 526         if (cp->extendedmode != 0)
 527                 return -EINVAL;
 528
 529         speed = calc_speed(sd, tpf->numerator, tpf->denominator);
 530
 531         mt9v011_write(sd, R0A_MT9V011_CLK_SPEED, speed);
 532         v4l2_dbg(1, debug, sd, "Setting speed to %d\n", speed);
 533
 534         /* Recalculate and update fps info */
 535         calc_fps(sd, &tpf->numerator, &tpf->denominator);
 536
 537         return 0;
 538 }
 539
 540 static int mt9v011_s_mbus_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *fmt)
 541 {
 542         struct mt9v011 *core = to_mt9v011(sd);
 543         int rc;
 544
 545         rc = mt9v011_try_mbus_fmt(sd, fmt);
 546         if (rc < 0)
 547                 return -EINVAL;
 548
 549         core->width = fmt->width;
 550         core->height = fmt->height;
 551
 552         set_res(sd);
 553
 554         return 0;
 555 }
 556
 557 #ifdef CONFIG_VIDEO_ADV_DEBUG
 558 static int mt9v011_g_register(struct v4l2_subdev *sd,
 559                               struct v4l2_dbg_register *reg)
 560 {
 561         struct i2c_client *client = v4l2_get_subdevdata(sd);
 562
 563         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 564                 return -EINVAL;
 565         if (!capable(CAP_SYS_ADMIN))
 566                 return -EPERM;
 567
 568         reg->val = mt9v011_read(sd, reg->reg & 0xff);
 569         reg->size = 2;
 570
 571         return 0;
 572 }
 573
 574 static int mt9v011_s_register(struct v4l2_subdev *sd,
 575                               struct v4l2_dbg_register *reg)
 576 {
 577         struct i2c_client *client = v4l2_get_subdevdata(sd);
 578
 579         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 580                 return -EINVAL;
 581         if (!capable(CAP_SYS_ADMIN))
 582                 return -EPERM;
 583
 584         mt9v011_write(sd, reg->reg & 0xff, reg->val & 0xffff);
 585
 586         return 0;
 587 }
 588 #endif
 589
 590 static int mt9v011_g_chip_ident(struct v4l2_subdev *sd,
 591                                 struct v4l2_dbg_chip_ident *chip)
 592 {
 593         u16 version;
 594         struct i2c_client *client = v4l2_get_subdevdata(sd);
 595
 596         version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION);
 597
 598         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_MT9V011,
 599                                           version);
 600 }
 601
 602 static const struct v4l2_subdev_core_ops mt9v011_core_ops = {
 603         .queryctrl = mt9v011_queryctrl,
 604         .g_ctrl = mt9v011_g_ctrl,
 605         .s_ctrl = mt9v011_s_ctrl,
 606         .reset = mt9v011_reset,
 607         .g_chip_ident = mt9v011_g_chip_ident,
 608 #ifdef CONFIG_VIDEO_ADV_DEBUG
 609         .g_register = mt9v011_g_register,
 610         .s_register = mt9v011_s_register,
 611 #endif
 612 };
 613
 614 static const struct v4l2_subdev_video_ops mt9v011_video_ops = {
 615         .enum_mbus_fmt = mt9v011_enum_mbus_fmt,
 616         .try_mbus_fmt = mt9v011_try_mbus_fmt,
 617         .s_mbus_fmt = mt9v011_s_mbus_fmt,
 618         .g_parm = mt9v011_g_parm,
 619         .s_parm = mt9v011_s_parm,
 620 };
 621
 622 static const struct v4l2_subdev_ops mt9v011_ops = {
 623         .core  = &mt9v011_core_ops,
 624         .video = &mt9v011_video_ops,
 625 };
 626
 627
 628 /****************************************************************************
 629                         I2C Client & Driver
 630  ****************************************************************************/
 631
 632 static int mt9v011_probe(struct i2c_client *c,
 633                          const struct i2c_device_id *id)
 634 {
 635         u16 version;
 636         struct mt9v011 *core;
 637         struct v4l2_subdev *sd;
 638
 639         /* Check if the adapter supports the needed features */
 640         if (!i2c_check_functionality(c->adapter,
 641              I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 642                 return -EIO;
 643
 644         core = kzalloc(sizeof(struct mt9v011), GFP_KERNEL);
 645         if (!core)
 646                 return -ENOMEM;
 647
 648         sd = &core->sd;
 649         v4l2_i2c_subdev_init(sd, c, &mt9v011_ops);
 650
 651         /* Check if the sensor is really a MT9V011 */
 652         version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION);
 653         if ((version != MT9V011_VERSION) &&
 654             (version != MT9V011_REV_B_VERSION)) {
 655                 v4l2_info(sd, "*** unknown micron chip detected (0x%04x).\n",
 656                           version);
 657                 kfree(core);
 658                 return -EINVAL;
 659         }
 660
 661         core->global_gain = 0x0024;
 662         core->exposure = 0x01fc;
 663         core->width  = 640;
 664         core->height = 480;
 665         core->xtal = 27000000;  /* Hz */
 666
 667         if (c->dev.platform_data) {
 668                 struct mt9v011_platform_data *pdata = c->dev.platform_data;
 669
 670                 core->xtal = pdata->xtal;
 671                 v4l2_dbg(1, debug, sd, "xtal set to %d.%03d MHz\n",
 672                         core->xtal / 1000000, (core->xtal / 1000) % 1000);
 673         }
 674
 675         v4l_info(c, "chip found @ 0x%02x (%s - chip version 0x%04x)\n",
 676                  c->addr << 1, c->adapter->name, version);
 677
 678         return 0;
 679 }
 680
 681 static int mt9v011_remove(struct i2c_client *c)
 682 {
 683         struct v4l2_subdev *sd = i2c_get_clientdata(c);
 684
 685         v4l2_dbg(1, debug, sd,
 686                 "mt9v011.c: removing mt9v011 adapter on address 0x%x\n",
 687                 c->addr << 1);
 688
 689         v4l2_device_unregister_subdev(sd);
 690         kfree(to_mt9v011(sd));
 691         return 0;
 692 }
 693
 694 /* ----------------------------------------------------------------------- */
 695
 696 static const struct i2c_device_id mt9v011_id[] = {
 697         { "mt9v011", 0 },
 698         { }
 699 };
 700 MODULE_DEVICE_TABLE(i2c, mt9v011_id);
 701
 702 static struct i2c_driver mt9v011_driver = {
 703         .driver = {
 704                 .owner  = THIS_MODULE,
 705                 .name   = "mt9v011",
 706         },
 707         .probe          = mt9v011_probe,
 708         .remove         = mt9v011_remove,
 709         .id_table       = mt9v011_id,
 710 };
 711
 712 module_i2c_driver(mt9v011_driver);