drivers/media/video/mt9t031.c

   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/soc_mediabus.h>
  20 #include <media/v4l2-chip-ident.h>
  21 #include <media/v4l2-subdev.h>
  22 #include <media/v4l2-ctrls.h>
  23
  24 /*
  25  * mt9t031 i2c address 0x5d
  26  * The platform has to define i2c_board_info and link to it from
  27  * struct soc_camera_link
  28  */
  29
  30 /* mt9t031 selected register addresses */
  31 #define MT9T031_CHIP_VERSION            0x00
  32 #define MT9T031_ROW_START               0x01
  33 #define MT9T031_COLUMN_START            0x02
  34 #define MT9T031_WINDOW_HEIGHT           0x03
  35 #define MT9T031_WINDOW_WIDTH            0x04
  36 #define MT9T031_HORIZONTAL_BLANKING     0x05
  37 #define MT9T031_VERTICAL_BLANKING       0x06
  38 #define MT9T031_OUTPUT_CONTROL          0x07
  39 #define MT9T031_SHUTTER_WIDTH_UPPER     0x08
  40 #define MT9T031_SHUTTER_WIDTH           0x09
  41 #define MT9T031_PIXEL_CLOCK_CONTROL     0x0a
  42 #define MT9T031_FRAME_RESTART           0x0b
  43 #define MT9T031_SHUTTER_DELAY           0x0c
  44 #define MT9T031_RESET                   0x0d
  45 #define MT9T031_READ_MODE_1             0x1e
  46 #define MT9T031_READ_MODE_2             0x20
  47 #define MT9T031_READ_MODE_3             0x21
  48 #define MT9T031_ROW_ADDRESS_MODE        0x22
  49 #define MT9T031_COLUMN_ADDRESS_MODE     0x23
  50 #define MT9T031_GLOBAL_GAIN             0x35
  51 #define MT9T031_CHIP_ENABLE             0xF8
  52
  53 #define MT9T031_MAX_HEIGHT              1536
  54 #define MT9T031_MAX_WIDTH               2048
  55 #define MT9T031_MIN_HEIGHT              2
  56 #define MT9T031_MIN_WIDTH               18
  57 #define MT9T031_HORIZONTAL_BLANK        142
  58 #define MT9T031_VERTICAL_BLANK          25
  59 #define MT9T031_COLUMN_SKIP             32
  60 #define MT9T031_ROW_SKIP                20
  61
  62 struct mt9t031 {
  63         struct v4l2_subdev subdev;
  64         struct v4l2_ctrl_handler hdl;
  65         struct {
  66                 /* exposure/auto-exposure cluster */
  67                 struct v4l2_ctrl *autoexposure;
  68                 struct v4l2_ctrl *exposure;
  69         };
  70         struct v4l2_rect rect;  /* Sensor window */
  71         int model;      /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
  72         u16 xskip;
  73         u16 yskip;
  74         unsigned int total_h;
  75         unsigned short y_skip_top;      /* Lines to skip at the top */
  76 };
  77
  78 static struct mt9t031 *to_mt9t031(const struct i2c_client *client)
  79 {
  80         return container_of(i2c_get_clientdata(client), struct mt9t031, subdev);
  81 }
  82
  83 static int reg_read(struct i2c_client *client, const u8 reg)
  84 {
  85         s32 data = i2c_smbus_read_word_data(client, reg);
  86         return data < 0 ? data : swab16(data);
  87 }
  88
  89 static int reg_write(struct i2c_client *client, const u8 reg,
  90                      const u16 data)
  91 {
  92         return i2c_smbus_write_word_data(client, reg, swab16(data));
  93 }
  94
  95 static int reg_set(struct i2c_client *client, const u8 reg,
  96                    const u16 data)
  97 {
  98         int ret;
  99
 100         ret = reg_read(client, reg);
 101         if (ret < 0)
 102                 return ret;
 103         return reg_write(client, reg, ret | data);
 104 }
 105
 106 static int reg_clear(struct i2c_client *client, const u8 reg,
 107                      const u16 data)
 108 {
 109         int ret;
 110
 111         ret = reg_read(client, reg);
 112         if (ret < 0)
 113                 return ret;
 114         return reg_write(client, reg, ret & ~data);
 115 }
 116
 117 static int set_shutter(struct i2c_client *client, const u32 data)
 118 {
 119         int ret;
 120
 121         ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
 122
 123         if (ret >= 0)
 124                 ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff);
 125
 126         return ret;
 127 }
 128
 129 static int get_shutter(struct i2c_client *client, u32 *data)
 130 {
 131         int ret;
 132
 133         ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER);
 134         *data = ret << 16;
 135
 136         if (ret >= 0)
 137                 ret = reg_read(client, MT9T031_SHUTTER_WIDTH);
 138         *data |= ret & 0xffff;
 139
 140         return ret < 0 ? ret : 0;
 141 }
 142
 143 static int mt9t031_idle(struct i2c_client *client)
 144 {
 145         int ret;
 146
 147         /* Disable chip output, synchronous option update */
 148         ret = reg_write(client, MT9T031_RESET, 1);
 149         if (ret >= 0)
 150                 ret = reg_write(client, MT9T031_RESET, 0);
 151         if (ret >= 0)
 152                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
 153
 154         return ret >= 0 ? 0 : -EIO;
 155 }
 156
 157 static int mt9t031_disable(struct i2c_client *client)
 158 {
 159         /* Disable the chip */
 160         reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
 161
 162         return 0;
 163 }
 164
 165 static int mt9t031_s_stream(struct v4l2_subdev *sd, int enable)
 166 {
 167         struct i2c_client *client = v4l2_get_subdevdata(sd);
 168         int ret;
 169
 170         if (enable)
 171                 /* Switch to master "normal" mode */
 172                 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 2);
 173         else
 174                 /* Stop sensor readout */
 175                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
 176
 177         if (ret < 0)
 178                 return -EIO;
 179
 180         return 0;
 181 }
 182
 183 /* target must be _even_ */
 184 static u16 mt9t031_skip(s32 *source, s32 target, s32 max)
 185 {
 186         unsigned int skip;
 187
 188         if (*source < target + target / 2) {
 189                 *source = target;
 190                 return 1;
 191         }
 192
 193         skip = min(max, *source + target / 2) / target;
 194         if (skip > 8)
 195                 skip = 8;
 196         *source = target * skip;
 197
 198         return skip;
 199 }
 200
 201 /* rect is the sensor rectangle, the caller guarantees parameter validity */
 202 static int mt9t031_set_params(struct i2c_client *client,
 203                               struct v4l2_rect *rect, u16 xskip, u16 yskip)
 204 {
 205         struct mt9t031 *mt9t031 = to_mt9t031(client);
 206         int ret;
 207         u16 xbin, ybin;
 208         const u16 hblank = MT9T031_HORIZONTAL_BLANK,
 209                 vblank = MT9T031_VERTICAL_BLANK;
 210
 211         xbin = min(xskip, (u16)3);
 212         ybin = min(yskip, (u16)3);
 213
 214         /*
 215          * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper.
 216          * There is always a valid suitably aligned value. The worst case is
 217          * xbin = 3, width = 2048. Then we will start at 36, the last read out
 218          * pixel will be 2083, which is < 2085 - first black pixel.
 219          *
 220          * MT9T031 datasheet imposes window left border alignment, depending on
 221          * the selected xskip. Failing to conform to this requirement produces
 222          * dark horizontal stripes in the image. However, even obeying to this
 223          * requirement doesn't eliminate the stripes in all configurations. They
 224          * appear "locally reproducibly," but can differ between tests under
 225          * different lighting conditions.
 226          */
 227         switch (xbin) {
 228         case 1:
 229                 rect->left &= ~1;
 230                 break;
 231         case 2:
 232                 rect->left &= ~3;
 233                 break;
 234         case 3:
 235                 rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ?
 236                         (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6);
 237         }
 238
 239         rect->top &= ~1;
 240
 241         dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n",
 242                 xskip, yskip, rect->width, rect->height, rect->left, rect->top);
 243
 244         /* Disable register update, reconfigure atomically */
 245         ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
 246         if (ret < 0)
 247                 return ret;
 248
 249         /* Blanking and start values - default... */
 250         ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank);
 251         if (ret >= 0)
 252                 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank);
 253
 254         if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
 255                 /* Binning, skipping */
 256                 if (ret >= 0)
 257                         ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
 258                                         ((xbin - 1) << 4) | (xskip - 1));
 259                 if (ret >= 0)
 260                         ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
 261                                         ((ybin - 1) << 4) | (yskip - 1));
 262         }
 263         dev_dbg(&client->dev, "new physical left %u, top %u\n",
 264                 rect->left, rect->top);
 265
 266         /*
 267          * The caller provides a supported format, as guaranteed by
 268          * .try_mbus_fmt(), soc_camera_s_crop() and soc_camera_cropcap()
 269          */
 270         if (ret >= 0)
 271                 ret = reg_write(client, MT9T031_COLUMN_START, rect->left);
 272         if (ret >= 0)
 273                 ret = reg_write(client, MT9T031_ROW_START, rect->top);
 274         if (ret >= 0)
 275                 ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1);
 276         if (ret >= 0)
 277                 ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
 278                                 rect->height + mt9t031->y_skip_top - 1);
 279         if (ret >= 0 && v4l2_ctrl_g_ctrl(mt9t031->autoexposure) == V4L2_EXPOSURE_AUTO) {
 280                 mt9t031->total_h = rect->height + mt9t031->y_skip_top + vblank;
 281
 282                 ret = set_shutter(client, mt9t031->total_h);
 283         }
 284
 285         /* Re-enable register update, commit all changes */
 286         if (ret >= 0)
 287                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
 288
 289         if (ret >= 0) {
 290                 mt9t031->rect = *rect;
 291                 mt9t031->xskip = xskip;
 292                 mt9t031->yskip = yskip;
 293         }
 294
 295         return ret < 0 ? ret : 0;
 296 }
 297
 298 static int mt9t031_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
 299 {
 300         struct v4l2_rect rect = a->c;
 301         struct i2c_client *client = v4l2_get_subdevdata(sd);
 302         struct mt9t031 *mt9t031 = to_mt9t031(client);
 303
 304         rect.width = ALIGN(rect.width, 2);
 305         rect.height = ALIGN(rect.height, 2);
 306
 307         soc_camera_limit_side(&rect.left, &rect.width,
 308                      MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH);
 309
 310         soc_camera_limit_side(&rect.top, &rect.height,
 311                      MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT);
 312
 313         return mt9t031_set_params(client, &rect, mt9t031->xskip, mt9t031->yskip);
 314 }
 315
 316 static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
 317 {
 318         struct i2c_client *client = v4l2_get_subdevdata(sd);
 319         struct mt9t031 *mt9t031 = to_mt9t031(client);
 320
 321         a->c    = mt9t031->rect;
 322         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 323
 324         return 0;
 325 }
 326
 327 static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
 328 {
 329         a->bounds.left                  = MT9T031_COLUMN_SKIP;
 330         a->bounds.top                   = MT9T031_ROW_SKIP;
 331         a->bounds.width                 = MT9T031_MAX_WIDTH;
 332         a->bounds.height                = MT9T031_MAX_HEIGHT;
 333         a->defrect                      = a->bounds;
 334         a->type                         = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 335         a->pixelaspect.numerator        = 1;
 336         a->pixelaspect.denominator      = 1;
 337
 338         return 0;
 339 }
 340
 341 static int mt9t031_g_fmt(struct v4l2_subdev *sd,
 342                          struct v4l2_mbus_framefmt *mf)
 343 {
 344         struct i2c_client *client = v4l2_get_subdevdata(sd);
 345         struct mt9t031 *mt9t031 = to_mt9t031(client);
 346
 347         mf->width       = mt9t031->rect.width / mt9t031->xskip;
 348         mf->height      = mt9t031->rect.height / mt9t031->yskip;
 349         mf->code        = V4L2_MBUS_FMT_SBGGR10_1X10;
 350         mf->colorspace  = V4L2_COLORSPACE_SRGB;
 351         mf->field       = V4L2_FIELD_NONE;
 352
 353         return 0;
 354 }
 355
 356 static int mt9t031_s_fmt(struct v4l2_subdev *sd,
 357                          struct v4l2_mbus_framefmt *mf)
 358 {
 359         struct i2c_client *client = v4l2_get_subdevdata(sd);
 360         struct mt9t031 *mt9t031 = to_mt9t031(client);
 361         u16 xskip, yskip;
 362         struct v4l2_rect rect = mt9t031->rect;
 363
 364         /*
 365          * try_fmt has put width and height within limits.
 366          * S_FMT: use binning and skipping for scaling
 367          */
 368         xskip = mt9t031_skip(&rect.width, mf->width, MT9T031_MAX_WIDTH);
 369         yskip = mt9t031_skip(&rect.height, mf->height, MT9T031_MAX_HEIGHT);
 370
 371         mf->code        = V4L2_MBUS_FMT_SBGGR10_1X10;
 372         mf->colorspace  = V4L2_COLORSPACE_SRGB;
 373
 374         /* mt9t031_set_params() doesn't change width and height */
 375         return mt9t031_set_params(client, &rect, xskip, yskip);
 376 }
 377
 378 /*
 379  * If a user window larger than sensor window is requested, we'll increase the
 380  * sensor window.
 381  */
 382 static int mt9t031_try_fmt(struct v4l2_subdev *sd,
 383                            struct v4l2_mbus_framefmt *mf)
 384 {
 385         v4l_bound_align_image(
 386                 &mf->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1,
 387                 &mf->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0);
 388
 389         mf->code        = V4L2_MBUS_FMT_SBGGR10_1X10;
 390         mf->colorspace  = V4L2_COLORSPACE_SRGB;
 391
 392         return 0;
 393 }
 394
 395 static int mt9t031_g_chip_ident(struct v4l2_subdev *sd,
 396                                 struct v4l2_dbg_chip_ident *id)
 397 {
 398         struct i2c_client *client = v4l2_get_subdevdata(sd);
 399         struct mt9t031 *mt9t031 = to_mt9t031(client);
 400
 401         if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
 402                 return -EINVAL;
 403
 404         if (id->match.addr != client->addr)
 405                 return -ENODEV;
 406
 407         id->ident       = mt9t031->model;
 408         id->revision    = 0;
 409
 410         return 0;
 411 }
 412
 413 #ifdef CONFIG_VIDEO_ADV_DEBUG
 414 static int mt9t031_g_register(struct v4l2_subdev *sd,
 415                               struct v4l2_dbg_register *reg)
 416 {
 417         struct i2c_client *client = v4l2_get_subdevdata(sd);
 418
 419         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 420                 return -EINVAL;
 421
 422         if (reg->match.addr != client->addr)
 423                 return -ENODEV;
 424
 425         reg->val = reg_read(client, reg->reg);
 426
 427         if (reg->val > 0xffff)
 428                 return -EIO;
 429
 430         return 0;
 431 }
 432
 433 static int mt9t031_s_register(struct v4l2_subdev *sd,
 434                               struct v4l2_dbg_register *reg)
 435 {
 436         struct i2c_client *client = v4l2_get_subdevdata(sd);
 437
 438         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 439                 return -EINVAL;
 440
 441         if (reg->match.addr != client->addr)
 442                 return -ENODEV;
 443
 444         if (reg_write(client, reg->reg, reg->val) < 0)
 445                 return -EIO;
 446
 447         return 0;
 448 }
 449 #endif
 450
 451 static int mt9t031_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 452 {
 453         struct mt9t031 *mt9t031 = container_of(ctrl->handler,
 454                                                struct mt9t031, hdl);
 455         const u32 shutter_max = MT9T031_MAX_HEIGHT + MT9T031_VERTICAL_BLANK;
 456         s32 min, max;
 457
 458         switch (ctrl->id) {
 459         case V4L2_CID_EXPOSURE_AUTO:
 460                 min = mt9t031->exposure->minimum;
 461                 max = mt9t031->exposure->maximum;
 462                 mt9t031->exposure->val =
 463                         (shutter_max / 2 + (mt9t031->total_h - 1) * (max - min))
 464                                 / shutter_max + min;
 465                 break;
 466         }
 467         return 0;
 468 }
 469
 470 static int mt9t031_s_ctrl(struct v4l2_ctrl *ctrl)
 471 {
 472         struct mt9t031 *mt9t031 = container_of(ctrl->handler,
 473                                                struct mt9t031, hdl);
 474         struct v4l2_subdev *sd = &mt9t031->subdev;
 475         struct i2c_client *client = v4l2_get_subdevdata(sd);
 476         struct v4l2_ctrl *exp = mt9t031->exposure;
 477         int data;
 478
 479         switch (ctrl->id) {
 480         case V4L2_CID_VFLIP:
 481                 if (ctrl->val)
 482                         data = reg_set(client, MT9T031_READ_MODE_2, 0x8000);
 483                 else
 484                         data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000);
 485                 if (data < 0)
 486                         return -EIO;
 487                 return 0;
 488         case V4L2_CID_HFLIP:
 489                 if (ctrl->val)
 490                         data = reg_set(client, MT9T031_READ_MODE_2, 0x4000);
 491                 else
 492                         data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000);
 493                 if (data < 0)
 494                         return -EIO;
 495                 return 0;
 496         case V4L2_CID_GAIN:
 497                 /* See Datasheet Table 7, Gain settings. */
 498                 if (ctrl->val <= ctrl->default_value) {
 499                         /* Pack it into 0..1 step 0.125, register values 0..8 */
 500                         unsigned long range = ctrl->default_value - ctrl->minimum;
 501                         data = ((ctrl->val - ctrl->minimum) * 8 + range / 2) / range;
 502
 503                         dev_dbg(&client->dev, "Setting gain %d\n", data);
 504                         data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
 505                         if (data < 0)
 506                                 return -EIO;
 507                 } else {
 508                         /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
 509                         /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
 510                         unsigned long range = ctrl->maximum - ctrl->default_value - 1;
 511                         /* calculated gain: map 65..127 to 9..1024 step 0.125 */
 512                         unsigned long gain = ((ctrl->val - ctrl->default_value - 1) *
 513                                                1015 + range / 2) / range + 9;
 514
 515                         if (gain <= 32)         /* calculated gain 9..32 -> 9..32 */
 516                                 data = gain;
 517                         else if (gain <= 64)    /* calculated gain 33..64 -> 0x51..0x60 */
 518                                 data = ((gain - 32) * 16 + 16) / 32 + 80;
 519                         else
 520                                 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
 521                                 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
 522
 523                         dev_dbg(&client->dev, "Set gain from 0x%x to 0x%x\n",
 524                                 reg_read(client, MT9T031_GLOBAL_GAIN), data);
 525                         data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
 526                         if (data < 0)
 527                                 return -EIO;
 528                 }
 529                 return 0;
 530
 531         case V4L2_CID_EXPOSURE_AUTO:
 532                 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
 533                         unsigned int range = exp->maximum - exp->minimum;
 534                         unsigned int shutter = ((exp->val - exp->minimum) * 1048 +
 535                                                  range / 2) / range + 1;
 536                         u32 old;
 537
 538                         get_shutter(client, &old);
 539                         dev_dbg(&client->dev, "Set shutter from %u to %u\n",
 540                                 old, shutter);
 541                         if (set_shutter(client, shutter) < 0)
 542                                 return -EIO;
 543                 } else {
 544                         const u16 vblank = MT9T031_VERTICAL_BLANK;
 545                         mt9t031->total_h = mt9t031->rect.height +
 546                                 mt9t031->y_skip_top + vblank;
 547
 548                         if (set_shutter(client, mt9t031->total_h) < 0)
 549                                 return -EIO;
 550                 }
 551                 return 0;
 552         default:
 553                 return -EINVAL;
 554         }
 555         return 0;
 556 }
 557
 558 /*
 559  * Power Management:
 560  * This function does nothing for now but must be present for pm to work
 561  */
 562 static int mt9t031_runtime_suspend(struct device *dev)
 563 {
 564         return 0;
 565 }
 566
 567 /*
 568  * Power Management:
 569  * COLUMN_ADDRESS_MODE and ROW_ADDRESS_MODE are not rewritten if unchanged
 570  * they are however changed at reset if the platform hook is present
 571  * thus we rewrite them with the values stored by the driver
 572  */
 573 static int mt9t031_runtime_resume(struct device *dev)
 574 {
 575         struct video_device *vdev = to_video_device(dev);
 576         struct v4l2_subdev *sd = soc_camera_vdev_to_subdev(vdev);
 577         struct i2c_client *client = v4l2_get_subdevdata(sd);
 578         struct mt9t031 *mt9t031 = to_mt9t031(client);
 579
 580         int ret;
 581         u16 xbin, ybin;
 582
 583         xbin = min(mt9t031->xskip, (u16)3);
 584         ybin = min(mt9t031->yskip, (u16)3);
 585
 586         ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
 587                 ((xbin - 1) << 4) | (mt9t031->xskip - 1));
 588         if (ret < 0)
 589                 return ret;
 590
 591         ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
 592                 ((ybin - 1) << 4) | (mt9t031->yskip - 1));
 593         if (ret < 0)
 594                 return ret;
 595
 596         return 0;
 597 }
 598
 599 static struct dev_pm_ops mt9t031_dev_pm_ops = {
 600         .runtime_suspend        = mt9t031_runtime_suspend,
 601         .runtime_resume         = mt9t031_runtime_resume,
 602 };
 603
 604 static struct device_type mt9t031_dev_type = {
 605         .name   = "MT9T031",
 606         .pm     = &mt9t031_dev_pm_ops,
 607 };
 608
 609 /*
 610  * Interface active, can use i2c. If it fails, it can indeed mean, that
 611  * this wasn't our capture interface, so, we wait for the right one
 612  */
 613 static int mt9t031_video_probe(struct i2c_client *client)
 614 {
 615         struct mt9t031 *mt9t031 = to_mt9t031(client);
 616         struct video_device *vdev = soc_camera_i2c_to_vdev(client);
 617         s32 data;
 618         int ret;
 619
 620         /* Enable the chip */
 621         data = reg_write(client, MT9T031_CHIP_ENABLE, 1);
 622         dev_dbg(&client->dev, "write: %d\n", data);
 623
 624         /* Read out the chip version register */
 625         data = reg_read(client, MT9T031_CHIP_VERSION);
 626
 627         switch (data) {
 628         case 0x1621:
 629                 mt9t031->model = V4L2_IDENT_MT9T031;
 630                 break;
 631         default:
 632                 dev_err(&client->dev,
 633                         "No MT9T031 chip detected, register read %x\n", data);
 634                 return -ENODEV;
 635         }
 636
 637         dev_info(&client->dev, "Detected a MT9T031 chip ID %x\n", data);
 638
 639         ret = mt9t031_idle(client);
 640         if (ret < 0) {
 641                 dev_err(&client->dev, "Failed to initialise the camera\n");
 642         } else {
 643                 vdev->dev.type = &mt9t031_dev_type;
 644                 v4l2_ctrl_handler_setup(&mt9t031->hdl);
 645         }
 646         return ret;
 647 }
 648
 649 static int mt9t031_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
 650 {
 651         struct i2c_client *client = v4l2_get_subdevdata(sd);
 652         struct mt9t031 *mt9t031 = to_mt9t031(client);
 653
 654         *lines = mt9t031->y_skip_top;
 655
 656         return 0;
 657 }
 658
 659 static const struct v4l2_ctrl_ops mt9t031_ctrl_ops = {
 660         .g_volatile_ctrl = mt9t031_g_volatile_ctrl,
 661         .s_ctrl = mt9t031_s_ctrl,
 662 };
 663
 664 static struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = {
 665         .g_chip_ident   = mt9t031_g_chip_ident,
 666 #ifdef CONFIG_VIDEO_ADV_DEBUG
 667         .g_register     = mt9t031_g_register,
 668         .s_register     = mt9t031_s_register,
 669 #endif
 670 };
 671
 672 static int mt9t031_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
 673                             enum v4l2_mbus_pixelcode *code)
 674 {
 675         if (index)
 676                 return -EINVAL;
 677
 678         *code = V4L2_MBUS_FMT_SBGGR10_1X10;
 679         return 0;
 680 }
 681
 682 static int mt9t031_g_mbus_config(struct v4l2_subdev *sd,
 683                                 struct v4l2_mbus_config *cfg)
 684 {
 685         struct i2c_client *client = v4l2_get_subdevdata(sd);
 686         struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 687
 688         cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_PCLK_SAMPLE_RISING |
 689                 V4L2_MBUS_PCLK_SAMPLE_FALLING | V4L2_MBUS_HSYNC_ACTIVE_HIGH |
 690                 V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_HIGH;
 691         cfg->type = V4L2_MBUS_PARALLEL;
 692         cfg->flags = soc_camera_apply_board_flags(icl, cfg);
 693
 694         return 0;
 695 }
 696
 697 static int mt9t031_s_mbus_config(struct v4l2_subdev *sd,
 698                                 const struct v4l2_mbus_config *cfg)
 699 {
 700         struct i2c_client *client = v4l2_get_subdevdata(sd);
 701         struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 702
 703         if (soc_camera_apply_board_flags(icl, cfg) &
 704             V4L2_MBUS_PCLK_SAMPLE_FALLING)
 705                 return reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
 706         else
 707                 return reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
 708 }
 709
 710 static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = {
 711         .s_stream       = mt9t031_s_stream,
 712         .s_mbus_fmt     = mt9t031_s_fmt,
 713         .g_mbus_fmt     = mt9t031_g_fmt,
 714         .try_mbus_fmt   = mt9t031_try_fmt,
 715         .s_crop         = mt9t031_s_crop,
 716         .g_crop         = mt9t031_g_crop,
 717         .cropcap        = mt9t031_cropcap,
 718         .enum_mbus_fmt  = mt9t031_enum_fmt,
 719         .g_mbus_config  = mt9t031_g_mbus_config,
 720         .s_mbus_config  = mt9t031_s_mbus_config,
 721 };
 722
 723 static struct v4l2_subdev_sensor_ops mt9t031_subdev_sensor_ops = {
 724         .g_skip_top_lines       = mt9t031_g_skip_top_lines,
 725 };
 726
 727 static struct v4l2_subdev_ops mt9t031_subdev_ops = {
 728         .core   = &mt9t031_subdev_core_ops,
 729         .video  = &mt9t031_subdev_video_ops,
 730         .sensor = &mt9t031_subdev_sensor_ops,
 731 };
 732
 733 static int mt9t031_probe(struct i2c_client *client,
 734                          const struct i2c_device_id *did)
 735 {
 736         struct mt9t031 *mt9t031;
 737         struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 738         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 739         int ret;
 740
 741         if (!icl) {
 742                 dev_err(&client->dev, "MT9T031 driver needs platform data\n");
 743                 return -EINVAL;
 744         }
 745
 746         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
 747                 dev_warn(&adapter->dev,
 748                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
 749                 return -EIO;
 750         }
 751
 752         mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
 753         if (!mt9t031)
 754                 return -ENOMEM;
 755
 756         v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops);
 757         v4l2_ctrl_handler_init(&mt9t031->hdl, 5);
 758         v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
 759                         V4L2_CID_VFLIP, 0, 1, 1, 0);
 760         v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
 761                         V4L2_CID_HFLIP, 0, 1, 1, 0);
 762         v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
 763                         V4L2_CID_GAIN, 0, 127, 1, 64);
 764
 765         /*
 766          * Simulated autoexposure. If enabled, we calculate shutter width
 767          * ourselves in the driver based on vertical blanking and frame width
 768          */
 769         mt9t031->autoexposure = v4l2_ctrl_new_std_menu(&mt9t031->hdl,
 770                         &mt9t031_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
 771                         V4L2_EXPOSURE_AUTO);
 772         mt9t031->exposure = v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
 773                         V4L2_CID_EXPOSURE, 1, 255, 1, 255);
 774
 775         mt9t031->subdev.ctrl_handler = &mt9t031->hdl;
 776         if (mt9t031->hdl.error) {
 777                 int err = mt9t031->hdl.error;
 778
 779                 kfree(mt9t031);
 780                 return err;
 781         }
 782         v4l2_ctrl_auto_cluster(2, &mt9t031->autoexposure,
 783                                 V4L2_EXPOSURE_MANUAL, true);
 784
 785         mt9t031->y_skip_top     = 0;
 786         mt9t031->rect.left      = MT9T031_COLUMN_SKIP;
 787         mt9t031->rect.top       = MT9T031_ROW_SKIP;
 788         mt9t031->rect.width     = MT9T031_MAX_WIDTH;
 789         mt9t031->rect.height    = MT9T031_MAX_HEIGHT;
 790
 791         mt9t031->xskip = 1;
 792         mt9t031->yskip = 1;
 793
 794         mt9t031_idle(client);
 795
 796         ret = mt9t031_video_probe(client);
 797
 798         mt9t031_disable(client);
 799
 800         if (ret) {
 801                 v4l2_ctrl_handler_free(&mt9t031->hdl);
 802                 kfree(mt9t031);
 803         }
 804
 805         return ret;
 806 }
 807
 808 static int mt9t031_remove(struct i2c_client *client)
 809 {
 810         struct mt9t031 *mt9t031 = to_mt9t031(client);
 811
 812         v4l2_device_unregister_subdev(&mt9t031->subdev);
 813         v4l2_ctrl_handler_free(&mt9t031->hdl);
 814         kfree(mt9t031);
 815
 816         return 0;
 817 }
 818
 819 static const struct i2c_device_id mt9t031_id[] = {
 820         { "mt9t031", 0 },
 821         { }
 822 };
 823 MODULE_DEVICE_TABLE(i2c, mt9t031_id);
 824
 825 static struct i2c_driver mt9t031_i2c_driver = {
 826         .driver = {
 827                 .name = "mt9t031",
 828         },
 829         .probe          = mt9t031_probe,
 830         .remove         = mt9t031_remove,
 831         .id_table       = mt9t031_id,
 832 };
 833
 834 static int __init mt9t031_mod_init(void)
 835 {
 836         return i2c_add_driver(&mt9t031_i2c_driver);
 837 }
 838
 839 static void __exit mt9t031_mod_exit(void)
 840 {
 841         i2c_del_driver(&mt9t031_i2c_driver);
 842 }
 843
 844 module_init(mt9t031_mod_init);
 845 module_exit(mt9t031_mod_exit);
 846
 847 MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
 848 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
 849 MODULE_LICENSE("GPL v2");