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   1 /*
   2  * Driver for MT9T031 CMOS Image Sensor from Micron
   3  *
   4  * Copyright (C) 2008, Guennadi Liakhovetski, DENX Software Engineering <lg@denx.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/device.h>
  12 #include <linux/i2c.h>
  13 #include <linux/log2.h>
  14 #include <linux/pm.h>
  15 #include <linux/slab.h>
  16 #include <linux/videodev2.h>
  17
  18 #include <media/soc_camera.h>
  19 #include <media/v4l2-chip-ident.h>
  20 #include <media/v4l2-subdev.h>
  21
  22 /*
  23  * mt9t031 i2c address 0x5d
  24  * The platform has to define i2c_board_info and link to it from
  25  * struct soc_camera_link
  26  */
  27
  28 /* mt9t031 selected register addresses */
  29 #define MT9T031_CHIP_VERSION            0x00
  30 #define MT9T031_ROW_START               0x01
  31 #define MT9T031_COLUMN_START            0x02
  32 #define MT9T031_WINDOW_HEIGHT           0x03
  33 #define MT9T031_WINDOW_WIDTH            0x04
  34 #define MT9T031_HORIZONTAL_BLANKING     0x05
  35 #define MT9T031_VERTICAL_BLANKING       0x06
  36 #define MT9T031_OUTPUT_CONTROL          0x07
  37 #define MT9T031_SHUTTER_WIDTH_UPPER     0x08
  38 #define MT9T031_SHUTTER_WIDTH           0x09
  39 #define MT9T031_PIXEL_CLOCK_CONTROL     0x0a
  40 #define MT9T031_FRAME_RESTART           0x0b
  41 #define MT9T031_SHUTTER_DELAY           0x0c
  42 #define MT9T031_RESET                   0x0d
  43 #define MT9T031_READ_MODE_1             0x1e
  44 #define MT9T031_READ_MODE_2             0x20
  45 #define MT9T031_READ_MODE_3             0x21
  46 #define MT9T031_ROW_ADDRESS_MODE        0x22
  47 #define MT9T031_COLUMN_ADDRESS_MODE     0x23
  48 #define MT9T031_GLOBAL_GAIN             0x35
  49 #define MT9T031_CHIP_ENABLE             0xF8
  50
  51 #define MT9T031_MAX_HEIGHT              1536
  52 #define MT9T031_MAX_WIDTH               2048
  53 #define MT9T031_MIN_HEIGHT              2
  54 #define MT9T031_MIN_WIDTH               18
  55 #define MT9T031_HORIZONTAL_BLANK        142
  56 #define MT9T031_VERTICAL_BLANK          25
  57 #define MT9T031_COLUMN_SKIP             32
  58 #define MT9T031_ROW_SKIP                20
  59
  60 #define MT9T031_BUS_PARAM       (SOCAM_PCLK_SAMPLE_RISING |     \
  61         SOCAM_PCLK_SAMPLE_FALLING | SOCAM_HSYNC_ACTIVE_HIGH |   \
  62         SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_HIGH |      \
  63         SOCAM_MASTER | SOCAM_DATAWIDTH_10)
  64
  65 struct mt9t031 {
  66         struct v4l2_subdev subdev;
  67         struct v4l2_rect rect;  /* Sensor window */
  68         int model;      /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
  69         u16 xskip;
  70         u16 yskip;
  71         unsigned int gain;
  72         unsigned short y_skip_top;      /* Lines to skip at the top */
  73         unsigned int exposure;
  74         unsigned char autoexposure;
  75 };
  76
  77 static struct mt9t031 *to_mt9t031(const struct i2c_client *client)
  78 {
  79         return container_of(i2c_get_clientdata(client), struct mt9t031, subdev);
  80 }
  81
  82 static int reg_read(struct i2c_client *client, const u8 reg)
  83 {
  84         s32 data = i2c_smbus_read_word_data(client, reg);
  85         return data < 0 ? data : swab16(data);
  86 }
  87
  88 static int reg_write(struct i2c_client *client, const u8 reg,
  89                      const u16 data)
  90 {
  91         return i2c_smbus_write_word_data(client, reg, swab16(data));
  92 }
  93
  94 static int reg_set(struct i2c_client *client, const u8 reg,
  95                    const u16 data)
  96 {
  97         int ret;
  98
  99         ret = reg_read(client, reg);
 100         if (ret < 0)
 101                 return ret;
 102         return reg_write(client, reg, ret | data);
 103 }
 104
 105 static int reg_clear(struct i2c_client *client, const u8 reg,
 106                      const u16 data)
 107 {
 108         int ret;
 109
 110         ret = reg_read(client, reg);
 111         if (ret < 0)
 112                 return ret;
 113         return reg_write(client, reg, ret & ~data);
 114 }
 115
 116 static int set_shutter(struct i2c_client *client, const u32 data)
 117 {
 118         int ret;
 119
 120         ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
 121
 122         if (ret >= 0)
 123                 ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff);
 124
 125         return ret;
 126 }
 127
 128 static int get_shutter(struct i2c_client *client, u32 *data)
 129 {
 130         int ret;
 131
 132         ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER);
 133         *data = ret << 16;
 134
 135         if (ret >= 0)
 136                 ret = reg_read(client, MT9T031_SHUTTER_WIDTH);
 137         *data |= ret & 0xffff;
 138
 139         return ret < 0 ? ret : 0;
 140 }
 141
 142 static int mt9t031_idle(struct i2c_client *client)
 143 {
 144         int ret;
 145
 146         /* Disable chip output, synchronous option update */
 147         ret = reg_write(client, MT9T031_RESET, 1);
 148         if (ret >= 0)
 149                 ret = reg_write(client, MT9T031_RESET, 0);
 150         if (ret >= 0)
 151                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
 152
 153         return ret >= 0 ? 0 : -EIO;
 154 }
 155
 156 static int mt9t031_disable(struct i2c_client *client)
 157 {
 158         /* Disable the chip */
 159         reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
 160
 161         return 0;
 162 }
 163
 164 static int mt9t031_s_stream(struct v4l2_subdev *sd, int enable)
 165 {
 166         struct i2c_client *client = sd->priv;
 167         int ret;
 168
 169         if (enable)
 170                 /* Switch to master "normal" mode */
 171                 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 2);
 172         else
 173                 /* Stop sensor readout */
 174                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
 175
 176         if (ret < 0)
 177                 return -EIO;
 178
 179         return 0;
 180 }
 181
 182 static int mt9t031_set_bus_param(struct soc_camera_device *icd,
 183                                  unsigned long flags)
 184 {
 185         struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
 186
 187         /* The caller should have queried our parameters, check anyway */
 188         if (flags & ~MT9T031_BUS_PARAM)
 189                 return -EINVAL;
 190
 191         if (flags & SOCAM_PCLK_SAMPLE_FALLING)
 192                 reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
 193         else
 194                 reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
 195
 196         return 0;
 197 }
 198
 199 static unsigned long mt9t031_query_bus_param(struct soc_camera_device *icd)
 200 {
 201         struct soc_camera_link *icl = to_soc_camera_link(icd);
 202
 203         return soc_camera_apply_sensor_flags(icl, MT9T031_BUS_PARAM);
 204 }
 205
 206 enum {
 207         MT9T031_CTRL_VFLIP,
 208         MT9T031_CTRL_HFLIP,
 209         MT9T031_CTRL_GAIN,
 210         MT9T031_CTRL_EXPOSURE,
 211         MT9T031_CTRL_EXPOSURE_AUTO,
 212 };
 213
 214 static const struct v4l2_queryctrl mt9t031_controls[] = {
 215         [MT9T031_CTRL_VFLIP] = {
 216                 .id             = V4L2_CID_VFLIP,
 217                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
 218                 .name           = "Flip Vertically",
 219                 .minimum        = 0,
 220                 .maximum        = 1,
 221                 .step           = 1,
 222                 .default_value  = 0,
 223         },
 224         [MT9T031_CTRL_HFLIP] = {
 225                 .id             = V4L2_CID_HFLIP,
 226                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
 227                 .name           = "Flip Horizontally",
 228                 .minimum        = 0,
 229                 .maximum        = 1,
 230                 .step           = 1,
 231                 .default_value  = 0,
 232         },
 233         [MT9T031_CTRL_GAIN] = {
 234                 .id             = V4L2_CID_GAIN,
 235                 .type           = V4L2_CTRL_TYPE_INTEGER,
 236                 .name           = "Gain",
 237                 .minimum        = 0,
 238                 .maximum        = 127,
 239                 .step           = 1,
 240                 .default_value  = 64,
 241                 .flags          = V4L2_CTRL_FLAG_SLIDER,
 242         },
 243         [MT9T031_CTRL_EXPOSURE] = {
 244                 .id             = V4L2_CID_EXPOSURE,
 245                 .type           = V4L2_CTRL_TYPE_INTEGER,
 246                 .name           = "Exposure",
 247                 .minimum        = 1,
 248                 .maximum        = 255,
 249                 .step           = 1,
 250                 .default_value  = 255,
 251                 .flags          = V4L2_CTRL_FLAG_SLIDER,
 252         },
 253         [MT9T031_CTRL_EXPOSURE_AUTO] = {
 254                 .id             = V4L2_CID_EXPOSURE_AUTO,
 255                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
 256                 .name           = "Automatic Exposure",
 257                 .minimum        = 0,
 258                 .maximum        = 1,
 259                 .step           = 1,
 260                 .default_value  = 1,
 261         }
 262 };
 263
 264 static struct soc_camera_ops mt9t031_ops = {
 265         .set_bus_param          = mt9t031_set_bus_param,
 266         .query_bus_param        = mt9t031_query_bus_param,
 267         .controls               = mt9t031_controls,
 268         .num_controls           = ARRAY_SIZE(mt9t031_controls),
 269 };
 270
 271 /* target must be _even_ */
 272 static u16 mt9t031_skip(s32 *source, s32 target, s32 max)
 273 {
 274         unsigned int skip;
 275
 276         if (*source < target + target / 2) {
 277                 *source = target;
 278                 return 1;
 279         }
 280
 281         skip = min(max, *source + target / 2) / target;
 282         if (skip > 8)
 283                 skip = 8;
 284         *source = target * skip;
 285
 286         return skip;
 287 }
 288
 289 /* rect is the sensor rectangle, the caller guarantees parameter validity */
 290 static int mt9t031_set_params(struct i2c_client *client,
 291                               struct v4l2_rect *rect, u16 xskip, u16 yskip)
 292 {
 293         struct mt9t031 *mt9t031 = to_mt9t031(client);
 294         int ret;
 295         u16 xbin, ybin;
 296         const u16 hblank = MT9T031_HORIZONTAL_BLANK,
 297                 vblank = MT9T031_VERTICAL_BLANK;
 298
 299         xbin = min(xskip, (u16)3);
 300         ybin = min(yskip, (u16)3);
 301
 302         /*
 303          * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper.
 304          * There is always a valid suitably aligned value. The worst case is
 305          * xbin = 3, width = 2048. Then we will start at 36, the last read out
 306          * pixel will be 2083, which is < 2085 - first black pixel.
 307          *
 308          * MT9T031 datasheet imposes window left border alignment, depending on
 309          * the selected xskip. Failing to conform to this requirement produces
 310          * dark horizontal stripes in the image. However, even obeying to this
 311          * requirement doesn't eliminate the stripes in all configurations. They
 312          * appear "locally reproducibly," but can differ between tests under
 313          * different lighting conditions.
 314          */
 315         switch (xbin) {
 316         case 1:
 317                 rect->left &= ~1;
 318                 break;
 319         case 2:
 320                 rect->left &= ~3;
 321                 break;
 322         case 3:
 323                 rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ?
 324                         (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6);
 325         }
 326
 327         rect->top &= ~1;
 328
 329         dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n",
 330                 xskip, yskip, rect->width, rect->height, rect->left, rect->top);
 331
 332         /* Disable register update, reconfigure atomically */
 333         ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
 334         if (ret < 0)
 335                 return ret;
 336
 337         /* Blanking and start values - default... */
 338         ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank);
 339         if (ret >= 0)
 340                 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank);
 341
 342         if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
 343                 /* Binning, skipping */
 344                 if (ret >= 0)
 345                         ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
 346                                         ((xbin - 1) << 4) | (xskip - 1));
 347                 if (ret >= 0)
 348                         ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
 349                                         ((ybin - 1) << 4) | (yskip - 1));
 350         }
 351         dev_dbg(&client->dev, "new physical left %u, top %u\n",
 352                 rect->left, rect->top);
 353
 354         /*
 355          * The caller provides a supported format, as guaranteed by
 356          * icd->try_fmt_cap(), soc_camera_s_crop() and soc_camera_cropcap()
 357          */
 358         if (ret >= 0)
 359                 ret = reg_write(client, MT9T031_COLUMN_START, rect->left);
 360         if (ret >= 0)
 361                 ret = reg_write(client, MT9T031_ROW_START, rect->top);
 362         if (ret >= 0)
 363                 ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1);
 364         if (ret >= 0)
 365                 ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
 366                                 rect->height + mt9t031->y_skip_top - 1);
 367         if (ret >= 0 && mt9t031->autoexposure) {
 368                 unsigned int total_h = rect->height + mt9t031->y_skip_top + vblank;
 369                 ret = set_shutter(client, total_h);
 370                 if (ret >= 0) {
 371                         const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
 372                         const struct v4l2_queryctrl *qctrl =
 373                                 &mt9t031_controls[MT9T031_CTRL_EXPOSURE];
 374                         mt9t031->exposure = (shutter_max / 2 + (total_h - 1) *
 375                                  (qctrl->maximum - qctrl->minimum)) /
 376                                 shutter_max + qctrl->minimum;
 377                 }
 378         }
 379
 380         /* Re-enable register update, commit all changes */
 381         if (ret >= 0)
 382                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
 383
 384         if (ret >= 0) {
 385                 mt9t031->rect = *rect;
 386                 mt9t031->xskip = xskip;
 387                 mt9t031->yskip = yskip;
 388         }
 389
 390         return ret < 0 ? ret : 0;
 391 }
 392
 393 static int mt9t031_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
 394 {
 395         struct v4l2_rect rect = a->c;
 396         struct i2c_client *client = sd->priv;
 397         struct mt9t031 *mt9t031 = to_mt9t031(client);
 398
 399         rect.width = ALIGN(rect.width, 2);
 400         rect.height = ALIGN(rect.height, 2);
 401
 402         soc_camera_limit_side(&rect.left, &rect.width,
 403                      MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH);
 404
 405         soc_camera_limit_side(&rect.top, &rect.height,
 406                      MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT);
 407
 408         return mt9t031_set_params(client, &rect, mt9t031->xskip, mt9t031->yskip);
 409 }
 410
 411 static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
 412 {
 413         struct i2c_client *client = sd->priv;
 414         struct mt9t031 *mt9t031 = to_mt9t031(client);
 415
 416         a->c    = mt9t031->rect;
 417         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 418
 419         return 0;
 420 }
 421
 422 static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
 423 {
 424         a->bounds.left                  = MT9T031_COLUMN_SKIP;
 425         a->bounds.top                   = MT9T031_ROW_SKIP;
 426         a->bounds.width                 = MT9T031_MAX_WIDTH;
 427         a->bounds.height                = MT9T031_MAX_HEIGHT;
 428         a->defrect                      = a->bounds;
 429         a->type                         = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 430         a->pixelaspect.numerator        = 1;
 431         a->pixelaspect.denominator      = 1;
 432
 433         return 0;
 434 }
 435
 436 static int mt9t031_g_fmt(struct v4l2_subdev *sd,
 437                          struct v4l2_mbus_framefmt *mf)
 438 {
 439         struct i2c_client *client = sd->priv;
 440         struct mt9t031 *mt9t031 = to_mt9t031(client);
 441
 442         mf->width       = mt9t031->rect.width / mt9t031->xskip;
 443         mf->height      = mt9t031->rect.height / mt9t031->yskip;
 444         mf->code        = V4L2_MBUS_FMT_SBGGR10_1X10;
 445         mf->colorspace  = V4L2_COLORSPACE_SRGB;
 446         mf->field       = V4L2_FIELD_NONE;
 447
 448         return 0;
 449 }
 450
 451 static int mt9t031_s_fmt(struct v4l2_subdev *sd,
 452                          struct v4l2_mbus_framefmt *mf)
 453 {
 454         struct i2c_client *client = sd->priv;
 455         struct mt9t031 *mt9t031 = to_mt9t031(client);
 456         u16 xskip, yskip;
 457         struct v4l2_rect rect = mt9t031->rect;
 458
 459         /*
 460          * try_fmt has put width and height within limits.
 461          * S_FMT: use binning and skipping for scaling
 462          */
 463         xskip = mt9t031_skip(&rect.width, mf->width, MT9T031_MAX_WIDTH);
 464         yskip = mt9t031_skip(&rect.height, mf->height, MT9T031_MAX_HEIGHT);
 465
 466         mf->code        = V4L2_MBUS_FMT_SBGGR10_1X10;
 467         mf->colorspace  = V4L2_COLORSPACE_SRGB;
 468
 469         /* mt9t031_set_params() doesn't change width and height */
 470         return mt9t031_set_params(client, &rect, xskip, yskip);
 471 }
 472
 473 /*
 474  * If a user window larger than sensor window is requested, we'll increase the
 475  * sensor window.
 476  */
 477 static int mt9t031_try_fmt(struct v4l2_subdev *sd,
 478                            struct v4l2_mbus_framefmt *mf)
 479 {
 480         v4l_bound_align_image(
 481                 &mf->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1,
 482                 &mf->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0);
 483
 484         mf->code        = V4L2_MBUS_FMT_SBGGR10_1X10;
 485         mf->colorspace  = V4L2_COLORSPACE_SRGB;
 486
 487         return 0;
 488 }
 489
 490 static int mt9t031_g_chip_ident(struct v4l2_subdev *sd,
 491                                 struct v4l2_dbg_chip_ident *id)
 492 {
 493         struct i2c_client *client = sd->priv;
 494         struct mt9t031 *mt9t031 = to_mt9t031(client);
 495
 496         if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
 497                 return -EINVAL;
 498
 499         if (id->match.addr != client->addr)
 500                 return -ENODEV;
 501
 502         id->ident       = mt9t031->model;
 503         id->revision    = 0;
 504
 505         return 0;
 506 }
 507
 508 #ifdef CONFIG_VIDEO_ADV_DEBUG
 509 static int mt9t031_g_register(struct v4l2_subdev *sd,
 510                               struct v4l2_dbg_register *reg)
 511 {
 512         struct i2c_client *client = sd->priv;
 513
 514         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 515                 return -EINVAL;
 516
 517         if (reg->match.addr != client->addr)
 518                 return -ENODEV;
 519
 520         reg->val = reg_read(client, reg->reg);
 521
 522         if (reg->val > 0xffff)
 523                 return -EIO;
 524
 525         return 0;
 526 }
 527
 528 static int mt9t031_s_register(struct v4l2_subdev *sd,
 529                               struct v4l2_dbg_register *reg)
 530 {
 531         struct i2c_client *client = sd->priv;
 532
 533         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 534                 return -EINVAL;
 535
 536         if (reg->match.addr != client->addr)
 537                 return -ENODEV;
 538
 539         if (reg_write(client, reg->reg, reg->val) < 0)
 540                 return -EIO;
 541
 542         return 0;
 543 }
 544 #endif
 545
 546 static int mt9t031_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 547 {
 548         struct i2c_client *client = sd->priv;
 549         struct mt9t031 *mt9t031 = to_mt9t031(client);
 550         int data;
 551
 552         switch (ctrl->id) {
 553         case V4L2_CID_VFLIP:
 554                 data = reg_read(client, MT9T031_READ_MODE_2);
 555                 if (data < 0)
 556                         return -EIO;
 557                 ctrl->value = !!(data & 0x8000);
 558                 break;
 559         case V4L2_CID_HFLIP:
 560                 data = reg_read(client, MT9T031_READ_MODE_2);
 561                 if (data < 0)
 562                         return -EIO;
 563                 ctrl->value = !!(data & 0x4000);
 564                 break;
 565         case V4L2_CID_EXPOSURE_AUTO:
 566                 ctrl->value = mt9t031->autoexposure;
 567                 break;
 568         case V4L2_CID_GAIN:
 569                 ctrl->value = mt9t031->gain;
 570                 break;
 571         case V4L2_CID_EXPOSURE:
 572                 ctrl->value = mt9t031->exposure;
 573                 break;
 574         }
 575         return 0;
 576 }
 577
 578 static int mt9t031_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 579 {
 580         struct i2c_client *client = sd->priv;
 581         struct mt9t031 *mt9t031 = to_mt9t031(client);
 582         const struct v4l2_queryctrl *qctrl;
 583         int data;
 584
 585         switch (ctrl->id) {
 586         case V4L2_CID_VFLIP:
 587                 if (ctrl->value)
 588                         data = reg_set(client, MT9T031_READ_MODE_2, 0x8000);
 589                 else
 590                         data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000);
 591                 if (data < 0)
 592                         return -EIO;
 593                 break;
 594         case V4L2_CID_HFLIP:
 595                 if (ctrl->value)
 596                         data = reg_set(client, MT9T031_READ_MODE_2, 0x4000);
 597                 else
 598                         data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000);
 599                 if (data < 0)
 600                         return -EIO;
 601                 break;
 602         case V4L2_CID_GAIN:
 603                 qctrl = &mt9t031_controls[MT9T031_CTRL_GAIN];
 604                 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
 605                         return -EINVAL;
 606                 /* See Datasheet Table 7, Gain settings. */
 607                 if (ctrl->value <= qctrl->default_value) {
 608                         /* Pack it into 0..1 step 0.125, register values 0..8 */
 609                         unsigned long range = qctrl->default_value - qctrl->minimum;
 610                         data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
 611
 612                         dev_dbg(&client->dev, "Setting gain %d\n", data);
 613                         data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
 614                         if (data < 0)
 615                                 return -EIO;
 616                 } else {
 617                         /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
 618                         /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
 619                         unsigned long range = qctrl->maximum - qctrl->default_value - 1;
 620                         /* calculated gain: map 65..127 to 9..1024 step 0.125 */
 621                         unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
 622                                                1015 + range / 2) / range + 9;
 623
 624                         if (gain <= 32)         /* calculated gain 9..32 -> 9..32 */
 625                                 data = gain;
 626                         else if (gain <= 64)    /* calculated gain 33..64 -> 0x51..0x60 */
 627                                 data = ((gain - 32) * 16 + 16) / 32 + 80;
 628                         else
 629                                 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
 630                                 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
 631
 632                         dev_dbg(&client->dev, "Set gain from 0x%x to 0x%x\n",
 633                                 reg_read(client, MT9T031_GLOBAL_GAIN), data);
 634                         data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
 635                         if (data < 0)
 636                                 return -EIO;
 637                 }
 638
 639                 /* Success */
 640                 mt9t031->gain = ctrl->value;
 641                 break;
 642         case V4L2_CID_EXPOSURE:
 643                 qctrl = &mt9t031_controls[MT9T031_CTRL_EXPOSURE];
 644                 /* mt9t031 has maximum == default */
 645                 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
 646                         return -EINVAL;
 647                 else {
 648                         const unsigned long range = qctrl->maximum - qctrl->minimum;
 649                         const u32 shutter = ((ctrl->value - qctrl->minimum) * 1048 +
 650                                              range / 2) / range + 1;
 651                         u32 old;
 652
 653                         get_shutter(client, &old);
 654                         dev_dbg(&client->dev, "Set shutter from %u to %u\n",
 655                                 old, shutter);
 656                         if (set_shutter(client, shutter) < 0)
 657                                 return -EIO;
 658                         mt9t031->exposure = ctrl->value;
 659                         mt9t031->autoexposure = 0;
 660                 }
 661                 break;
 662         case V4L2_CID_EXPOSURE_AUTO:
 663                 if (ctrl->value) {
 664                         const u16 vblank = MT9T031_VERTICAL_BLANK;
 665                         const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
 666                         unsigned int total_h = mt9t031->rect.height +
 667                                 mt9t031->y_skip_top + vblank;
 668
 669                         if (set_shutter(client, total_h) < 0)
 670                                 return -EIO;
 671                         qctrl = &mt9t031_controls[MT9T031_CTRL_EXPOSURE];
 672                         mt9t031->exposure = (shutter_max / 2 + (total_h - 1) *
 673                                  (qctrl->maximum - qctrl->minimum)) /
 674                                 shutter_max + qctrl->minimum;
 675                         mt9t031->autoexposure = 1;
 676                 } else
 677                         mt9t031->autoexposure = 0;
 678                 break;
 679         default:
 680                 return -EINVAL;
 681         }
 682         return 0;
 683 }
 684
 685 /*
 686  * Power Management:
 687  * This function does nothing for now but must be present for pm to work
 688  */
 689 static int mt9t031_runtime_suspend(struct device *dev)
 690 {
 691         return 0;
 692 }
 693
 694 /*
 695  * Power Management:
 696  * COLUMN_ADDRESS_MODE and ROW_ADDRESS_MODE are not rewritten if unchanged
 697  * they are however changed at reset if the platform hook is present
 698  * thus we rewrite them with the values stored by the driver
 699  */
 700 static int mt9t031_runtime_resume(struct device *dev)
 701 {
 702         struct video_device *vdev = to_video_device(dev);
 703         struct soc_camera_device *icd = container_of(vdev->parent,
 704                 struct soc_camera_device, dev);
 705         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 706         struct i2c_client *client = sd->priv;
 707         struct mt9t031 *mt9t031 = to_mt9t031(client);
 708
 709         int ret;
 710         u16 xbin, ybin;
 711
 712         xbin = min(mt9t031->xskip, (u16)3);
 713         ybin = min(mt9t031->yskip, (u16)3);
 714
 715         ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
 716                 ((xbin - 1) << 4) | (mt9t031->xskip - 1));
 717         if (ret < 0)
 718                 return ret;
 719
 720         ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
 721                 ((ybin - 1) << 4) | (mt9t031->yskip - 1));
 722         if (ret < 0)
 723                 return ret;
 724
 725         return 0;
 726 }
 727
 728 static struct dev_pm_ops mt9t031_dev_pm_ops = {
 729         .runtime_suspend        = mt9t031_runtime_suspend,
 730         .runtime_resume         = mt9t031_runtime_resume,
 731 };
 732
 733 static struct device_type mt9t031_dev_type = {
 734         .name   = "MT9T031",
 735         .pm     = &mt9t031_dev_pm_ops,
 736 };
 737
 738 /*
 739  * Interface active, can use i2c. If it fails, it can indeed mean, that
 740  * this wasn't our capture interface, so, we wait for the right one
 741  */
 742 static int mt9t031_video_probe(struct i2c_client *client)
 743 {
 744         struct mt9t031 *mt9t031 = to_mt9t031(client);
 745         struct video_device *vdev = soc_camera_i2c_to_vdev(client);
 746         s32 data;
 747         int ret;
 748
 749         /* Enable the chip */
 750         data = reg_write(client, MT9T031_CHIP_ENABLE, 1);
 751         dev_dbg(&client->dev, "write: %d\n", data);
 752
 753         /* Read out the chip version register */
 754         data = reg_read(client, MT9T031_CHIP_VERSION);
 755
 756         switch (data) {
 757         case 0x1621:
 758                 mt9t031->model = V4L2_IDENT_MT9T031;
 759                 break;
 760         default:
 761                 dev_err(&client->dev,
 762                         "No MT9T031 chip detected, register read %x\n", data);
 763                 return -ENODEV;
 764         }
 765
 766         dev_info(&client->dev, "Detected a MT9T031 chip ID %x\n", data);
 767
 768         ret = mt9t031_idle(client);
 769         if (ret < 0)
 770                 dev_err(&client->dev, "Failed to initialise the camera\n");
 771         else
 772                 vdev->dev.type = &mt9t031_dev_type;
 773
 774         /* mt9t031_idle() has reset the chip to default. */
 775         mt9t031->exposure = 255;
 776         mt9t031->gain = 64;
 777
 778         return ret;
 779 }
 780
 781 static int mt9t031_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
 782 {
 783         struct i2c_client *client = sd->priv;
 784         struct mt9t031 *mt9t031 = to_mt9t031(client);
 785
 786         *lines = mt9t031->y_skip_top;
 787
 788         return 0;
 789 }
 790
 791 static struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = {
 792         .g_ctrl         = mt9t031_g_ctrl,
 793         .s_ctrl         = mt9t031_s_ctrl,
 794         .g_chip_ident   = mt9t031_g_chip_ident,
 795 #ifdef CONFIG_VIDEO_ADV_DEBUG
 796         .g_register     = mt9t031_g_register,
 797         .s_register     = mt9t031_s_register,
 798 #endif
 799 };
 800
 801 static int mt9t031_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
 802                             enum v4l2_mbus_pixelcode *code)
 803 {
 804         if (index)
 805                 return -EINVAL;
 806
 807         *code = V4L2_MBUS_FMT_SBGGR10_1X10;
 808         return 0;
 809 }
 810
 811 static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = {
 812         .s_stream       = mt9t031_s_stream,
 813         .s_mbus_fmt     = mt9t031_s_fmt,
 814         .g_mbus_fmt     = mt9t031_g_fmt,
 815         .try_mbus_fmt   = mt9t031_try_fmt,
 816         .s_crop         = mt9t031_s_crop,
 817         .g_crop         = mt9t031_g_crop,
 818         .cropcap        = mt9t031_cropcap,
 819         .enum_mbus_fmt  = mt9t031_enum_fmt,
 820 };
 821
 822 static struct v4l2_subdev_sensor_ops mt9t031_subdev_sensor_ops = {
 823         .g_skip_top_lines       = mt9t031_g_skip_top_lines,
 824 };
 825
 826 static struct v4l2_subdev_ops mt9t031_subdev_ops = {
 827         .core   = &mt9t031_subdev_core_ops,
 828         .video  = &mt9t031_subdev_video_ops,
 829         .sensor = &mt9t031_subdev_sensor_ops,
 830 };
 831
 832 static int mt9t031_probe(struct i2c_client *client,
 833                          const struct i2c_device_id *did)
 834 {
 835         struct mt9t031 *mt9t031;
 836         struct soc_camera_device *icd = client->dev.platform_data;
 837         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 838         int ret;
 839
 840         if (icd) {
 841                 struct soc_camera_link *icl = to_soc_camera_link(icd);
 842                 if (!icl) {
 843                         dev_err(&client->dev, "MT9T031 driver needs platform data\n");
 844                         return -EINVAL;
 845                 }
 846
 847                 icd->ops = &mt9t031_ops;
 848         }
 849
 850         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
 851                 dev_warn(&adapter->dev,
 852                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
 853                 return -EIO;
 854         }
 855
 856         mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
 857         if (!mt9t031)
 858                 return -ENOMEM;
 859
 860         v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops);
 861
 862         mt9t031->y_skip_top     = 0;
 863         mt9t031->rect.left      = MT9T031_COLUMN_SKIP;
 864         mt9t031->rect.top       = MT9T031_ROW_SKIP;
 865         mt9t031->rect.width     = MT9T031_MAX_WIDTH;
 866         mt9t031->rect.height    = MT9T031_MAX_HEIGHT;
 867
 868         /*
 869          * Simulated autoexposure. If enabled, we calculate shutter width
 870          * ourselves in the driver based on vertical blanking and frame width
 871          */
 872         mt9t031->autoexposure = 1;
 873
 874         mt9t031->xskip = 1;
 875         mt9t031->yskip = 1;
 876
 877         mt9t031_idle(client);
 878
 879         ret = mt9t031_video_probe(client);
 880
 881         mt9t031_disable(client);
 882
 883         if (ret) {
 884                 if (icd)
 885                         icd->ops = NULL;
 886                 kfree(mt9t031);
 887         }
 888
 889         return ret;
 890 }
 891
 892 static int mt9t031_remove(struct i2c_client *client)
 893 {
 894         struct mt9t031 *mt9t031 = to_mt9t031(client);
 895         struct soc_camera_device *icd = client->dev.platform_data;
 896
 897         if (icd)
 898                 icd->ops = NULL;
 899         client->driver = NULL;
 900         kfree(mt9t031);
 901
 902         return 0;
 903 }
 904
 905 static const struct i2c_device_id mt9t031_id[] = {
 906         { "mt9t031", 0 },
 907         { }
 908 };
 909 MODULE_DEVICE_TABLE(i2c, mt9t031_id);
 910
 911 static struct i2c_driver mt9t031_i2c_driver = {
 912         .driver = {
 913                 .name = "mt9t031",
 914         },
 915         .probe          = mt9t031_probe,
 916         .remove         = mt9t031_remove,
 917         .id_table       = mt9t031_id,
 918 };
 919
 920 static int __init mt9t031_mod_init(void)
 921 {
 922         return i2c_add_driver(&mt9t031_i2c_driver);
 923 }
 924
 925 static void __exit mt9t031_mod_exit(void)
 926 {
 927         i2c_del_driver(&mt9t031_i2c_driver);
 928 }
 929
 930 module_init(mt9t031_mod_init);
 931 module_exit(mt9t031_mod_exit);
 932
 933 MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
 934 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
 935 MODULE_LICENSE("GPL v2");