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/v4l2-mediabus.h>
  17 #include <linux/videodev2.h>
  18 #include <linux/module.h>
  19
  20 #include <media/soc_camera.h>
  21 #include <media/v4l2-chip-ident.h>
  22 #include <media/v4l2-subdev.h>
  23 #include <media/v4l2-ctrls.h>
  24
  25 /*
  26  * ATTENTION: this driver still cannot be used outside of the soc-camera
  27  * framework because of its PM implementation, using the video_device node.
  28  * If hardware becomes available for testing, alternative PM approaches shall
  29  * be considered and tested.
  30  */
  31
  32 /*
  33  * mt9t031 i2c address 0x5d
  34  * The platform has to define i2c_board_info and link to it from
  35  * struct soc_camera_link
  36  */
  37
  38 /* mt9t031 selected register addresses */
  39 #define MT9T031_CHIP_VERSION            0x00
  40 #define MT9T031_ROW_START               0x01
  41 #define MT9T031_COLUMN_START            0x02
  42 #define MT9T031_WINDOW_HEIGHT           0x03
  43 #define MT9T031_WINDOW_WIDTH            0x04
  44 #define MT9T031_HORIZONTAL_BLANKING     0x05
  45 #define MT9T031_VERTICAL_BLANKING       0x06
  46 #define MT9T031_OUTPUT_CONTROL          0x07
  47 #define MT9T031_SHUTTER_WIDTH_UPPER     0x08
  48 #define MT9T031_SHUTTER_WIDTH           0x09
  49 #define MT9T031_PIXEL_CLOCK_CONTROL     0x0a
  50 #define MT9T031_FRAME_RESTART           0x0b
  51 #define MT9T031_SHUTTER_DELAY           0x0c
  52 #define MT9T031_RESET                   0x0d
  53 #define MT9T031_READ_MODE_1             0x1e
  54 #define MT9T031_READ_MODE_2             0x20
  55 #define MT9T031_READ_MODE_3             0x21
  56 #define MT9T031_ROW_ADDRESS_MODE        0x22
  57 #define MT9T031_COLUMN_ADDRESS_MODE     0x23
  58 #define MT9T031_GLOBAL_GAIN             0x35
  59 #define MT9T031_CHIP_ENABLE             0xF8
  60
  61 #define MT9T031_MAX_HEIGHT              1536
  62 #define MT9T031_MAX_WIDTH               2048
  63 #define MT9T031_MIN_HEIGHT              2
  64 #define MT9T031_MIN_WIDTH               18
  65 #define MT9T031_HORIZONTAL_BLANK        142
  66 #define MT9T031_VERTICAL_BLANK          25
  67 #define MT9T031_COLUMN_SKIP             32
  68 #define MT9T031_ROW_SKIP                20
  69
  70 struct mt9t031 {
  71         struct v4l2_subdev subdev;
  72         struct v4l2_ctrl_handler hdl;
  73         struct {
  74                 /* exposure/auto-exposure cluster */
  75                 struct v4l2_ctrl *autoexposure;
  76                 struct v4l2_ctrl *exposure;
  77         };
  78         struct v4l2_rect rect;  /* Sensor window */
  79         int model;      /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
  80         u16 xskip;
  81         u16 yskip;
  82         unsigned int total_h;
  83         unsigned short y_skip_top;      /* Lines to skip at the top */
  84 };
  85
  86 static struct mt9t031 *to_mt9t031(const struct i2c_client *client)
  87 {
  88         return container_of(i2c_get_clientdata(client), struct mt9t031, subdev);
  89 }
  90
  91 static int reg_read(struct i2c_client *client, const u8 reg)
  92 {
  93         return i2c_smbus_read_word_swapped(client, reg);
  94 }
  95
  96 static int reg_write(struct i2c_client *client, const u8 reg,
  97                      const u16 data)
  98 {
  99         return i2c_smbus_write_word_swapped(client, reg, data);
 100 }
 101
 102 static int reg_set(struct i2c_client *client, const u8 reg,
 103                    const u16 data)
 104 {
 105         int ret;
 106
 107         ret = reg_read(client, reg);
 108         if (ret < 0)
 109                 return ret;
 110         return reg_write(client, reg, ret | data);
 111 }
 112
 113 static int reg_clear(struct i2c_client *client, const u8 reg,
 114                      const u16 data)
 115 {
 116         int ret;
 117
 118         ret = reg_read(client, reg);
 119         if (ret < 0)
 120                 return ret;
 121         return reg_write(client, reg, ret & ~data);
 122 }
 123
 124 static int set_shutter(struct i2c_client *client, const u32 data)
 125 {
 126         int ret;
 127
 128         ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
 129
 130         if (ret >= 0)
 131                 ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff);
 132
 133         return ret;
 134 }
 135
 136 static int get_shutter(struct i2c_client *client, u32 *data)
 137 {
 138         int ret;
 139
 140         ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER);
 141         *data = ret << 16;
 142
 143         if (ret >= 0)
 144                 ret = reg_read(client, MT9T031_SHUTTER_WIDTH);
 145         *data |= ret & 0xffff;
 146
 147         return ret < 0 ? ret : 0;
 148 }
 149
 150 static int mt9t031_idle(struct i2c_client *client)
 151 {
 152         int ret;
 153
 154         /* Disable chip output, synchronous option update */
 155         ret = reg_write(client, MT9T031_RESET, 1);
 156         if (ret >= 0)
 157                 ret = reg_write(client, MT9T031_RESET, 0);
 158         if (ret >= 0)
 159                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
 160
 161         return ret >= 0 ? 0 : -EIO;
 162 }
 163
 164 static int mt9t031_disable(struct i2c_client *client)
 165 {
 166         /* Disable the chip */
 167         reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
 168
 169         return 0;
 170 }
 171
 172 static int mt9t031_s_stream(struct v4l2_subdev *sd, int enable)
 173 {
 174         struct i2c_client *client = v4l2_get_subdevdata(sd);
 175         int ret;
 176
 177         if (enable)
 178                 /* Switch to master "normal" mode */
 179                 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 2);
 180         else
 181                 /* Stop sensor readout */
 182                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
 183
 184         if (ret < 0)
 185                 return -EIO;
 186
 187         return 0;
 188 }
 189
 190 /* target must be _even_ */
 191 static u16 mt9t031_skip(s32 *source, s32 target, s32 max)
 192 {
 193         unsigned int skip;
 194
 195         if (*source < target + target / 2) {
 196                 *source = target;
 197                 return 1;
 198         }
 199
 200         skip = min(max, *source + target / 2) / target;
 201         if (skip > 8)
 202                 skip = 8;
 203         *source = target * skip;
 204
 205         return skip;
 206 }
 207
 208 /* rect is the sensor rectangle, the caller guarantees parameter validity */
 209 static int mt9t031_set_params(struct i2c_client *client,
 210                               struct v4l2_rect *rect, u16 xskip, u16 yskip)
 211 {
 212         struct mt9t031 *mt9t031 = to_mt9t031(client);
 213         int ret;
 214         u16 xbin, ybin;
 215         const u16 hblank = MT9T031_HORIZONTAL_BLANK,
 216                 vblank = MT9T031_VERTICAL_BLANK;
 217
 218         xbin = min(xskip, (u16)3);
 219         ybin = min(yskip, (u16)3);
 220
 221         /*
 222          * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper.
 223          * There is always a valid suitably aligned value. The worst case is
 224          * xbin = 3, width = 2048. Then we will start at 36, the last read out
 225          * pixel will be 2083, which is < 2085 - first black pixel.
 226          *
 227          * MT9T031 datasheet imposes window left border alignment, depending on
 228          * the selected xskip. Failing to conform to this requirement produces
 229          * dark horizontal stripes in the image. However, even obeying to this
 230          * requirement doesn't eliminate the stripes in all configurations. They
 231          * appear "locally reproducibly," but can differ between tests under
 232          * different lighting conditions.
 233          */
 234         switch (xbin) {
 235         case 1:
 236                 rect->left &= ~1;
 237                 break;
 238         case 2:
 239                 rect->left &= ~3;
 240                 break;
 241         case 3:
 242                 rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ?
 243                         (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6);
 244         }
 245
 246         rect->top &= ~1;
 247
 248         dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n",
 249                 xskip, yskip, rect->width, rect->height, rect->left, rect->top);
 250
 251         /* Disable register update, reconfigure atomically */
 252         ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
 253         if (ret < 0)
 254                 return ret;
 255
 256         /* Blanking and start values - default... */
 257         ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank);
 258         if (ret >= 0)
 259                 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank);
 260
 261         if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
 262                 /* Binning, skipping */
 263                 if (ret >= 0)
 264                         ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
 265                                         ((xbin - 1) << 4) | (xskip - 1));
 266                 if (ret >= 0)
 267                         ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
 268                                         ((ybin - 1) << 4) | (yskip - 1));
 269         }
 270         dev_dbg(&client->dev, "new physical left %u, top %u\n",
 271                 rect->left, rect->top);
 272
 273         /*
 274          * The caller provides a supported format, as guaranteed by
 275          * .try_mbus_fmt(), soc_camera_s_crop() and soc_camera_cropcap()
 276          */
 277         if (ret >= 0)
 278                 ret = reg_write(client, MT9T031_COLUMN_START, rect->left);
 279         if (ret >= 0)
 280                 ret = reg_write(client, MT9T031_ROW_START, rect->top);
 281         if (ret >= 0)
 282                 ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1);
 283         if (ret >= 0)
 284                 ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
 285                                 rect->height + mt9t031->y_skip_top - 1);
 286         if (ret >= 0 && v4l2_ctrl_g_ctrl(mt9t031->autoexposure) == V4L2_EXPOSURE_AUTO) {
 287                 mt9t031->total_h = rect->height + mt9t031->y_skip_top + vblank;
 288
 289                 ret = set_shutter(client, mt9t031->total_h);
 290         }
 291
 292         /* Re-enable register update, commit all changes */
 293         if (ret >= 0)
 294                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
 295
 296         if (ret >= 0) {
 297                 mt9t031->rect = *rect;
 298                 mt9t031->xskip = xskip;
 299                 mt9t031->yskip = yskip;
 300         }
 301
 302         return ret < 0 ? ret : 0;
 303 }
 304
 305 static int mt9t031_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
 306 {
 307         struct v4l2_rect rect = a->c;
 308         struct i2c_client *client = v4l2_get_subdevdata(sd);
 309         struct mt9t031 *mt9t031 = to_mt9t031(client);
 310
 311         rect.width = ALIGN(rect.width, 2);
 312         rect.height = ALIGN(rect.height, 2);
 313
 314         soc_camera_limit_side(&rect.left, &rect.width,
 315                      MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH);
 316
 317         soc_camera_limit_side(&rect.top, &rect.height,
 318                      MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT);
 319
 320         return mt9t031_set_params(client, &rect, mt9t031->xskip, mt9t031->yskip);
 321 }
 322
 323 static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
 324 {
 325         struct i2c_client *client = v4l2_get_subdevdata(sd);
 326         struct mt9t031 *mt9t031 = to_mt9t031(client);
 327
 328         a->c    = mt9t031->rect;
 329         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 330
 331         return 0;
 332 }
 333
 334 static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
 335 {
 336         a->bounds.left                  = MT9T031_COLUMN_SKIP;
 337         a->bounds.top                   = MT9T031_ROW_SKIP;
 338         a->bounds.width                 = MT9T031_MAX_WIDTH;
 339         a->bounds.height                = MT9T031_MAX_HEIGHT;
 340         a->defrect                      = a->bounds;
 341         a->type                         = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 342         a->pixelaspect.numerator        = 1;
 343         a->pixelaspect.denominator      = 1;
 344
 345         return 0;
 346 }
 347
 348 static int mt9t031_g_fmt(struct v4l2_subdev *sd,
 349                          struct v4l2_mbus_framefmt *mf)
 350 {
 351         struct i2c_client *client = v4l2_get_subdevdata(sd);
 352         struct mt9t031 *mt9t031 = to_mt9t031(client);
 353
 354         mf->width       = mt9t031->rect.width / mt9t031->xskip;
 355         mf->height      = mt9t031->rect.height / mt9t031->yskip;
 356         mf->code        = V4L2_MBUS_FMT_SBGGR10_1X10;
 357         mf->colorspace  = V4L2_COLORSPACE_SRGB;
 358         mf->field       = V4L2_FIELD_NONE;
 359
 360         return 0;
 361 }
 362
 363 static int mt9t031_s_fmt(struct v4l2_subdev *sd,
 364                          struct v4l2_mbus_framefmt *mf)
 365 {
 366         struct i2c_client *client = v4l2_get_subdevdata(sd);
 367         struct mt9t031 *mt9t031 = to_mt9t031(client);
 368         u16 xskip, yskip;
 369         struct v4l2_rect rect = mt9t031->rect;
 370
 371         /*
 372          * try_fmt has put width and height within limits.
 373          * S_FMT: use binning and skipping for scaling
 374          */
 375         xskip = mt9t031_skip(&rect.width, mf->width, MT9T031_MAX_WIDTH);
 376         yskip = mt9t031_skip(&rect.height, mf->height, MT9T031_MAX_HEIGHT);
 377
 378         mf->code        = V4L2_MBUS_FMT_SBGGR10_1X10;
 379         mf->colorspace  = V4L2_COLORSPACE_SRGB;
 380
 381         /* mt9t031_set_params() doesn't change width and height */
 382         return mt9t031_set_params(client, &rect, xskip, yskip);
 383 }
 384
 385 /*
 386  * If a user window larger than sensor window is requested, we'll increase the
 387  * sensor window.
 388  */
 389 static int mt9t031_try_fmt(struct v4l2_subdev *sd,
 390                            struct v4l2_mbus_framefmt *mf)
 391 {
 392         v4l_bound_align_image(
 393                 &mf->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1,
 394                 &mf->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0);
 395
 396         mf->code        = V4L2_MBUS_FMT_SBGGR10_1X10;
 397         mf->colorspace  = V4L2_COLORSPACE_SRGB;
 398
 399         return 0;
 400 }
 401
 402 static int mt9t031_g_chip_ident(struct v4l2_subdev *sd,
 403                                 struct v4l2_dbg_chip_ident *id)
 404 {
 405         struct i2c_client *client = v4l2_get_subdevdata(sd);
 406         struct mt9t031 *mt9t031 = to_mt9t031(client);
 407
 408         if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
 409                 return -EINVAL;
 410
 411         if (id->match.addr != client->addr)
 412                 return -ENODEV;
 413
 414         id->ident       = mt9t031->model;
 415         id->revision    = 0;
 416
 417         return 0;
 418 }
 419
 420 #ifdef CONFIG_VIDEO_ADV_DEBUG
 421 static int mt9t031_g_register(struct v4l2_subdev *sd,
 422                               struct v4l2_dbg_register *reg)
 423 {
 424         struct i2c_client *client = v4l2_get_subdevdata(sd);
 425
 426         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 427                 return -EINVAL;
 428
 429         if (reg->match.addr != client->addr)
 430                 return -ENODEV;
 431
 432         reg->val = reg_read(client, reg->reg);
 433
 434         if (reg->val > 0xffff)
 435                 return -EIO;
 436
 437         return 0;
 438 }
 439
 440 static int mt9t031_s_register(struct v4l2_subdev *sd,
 441                               struct v4l2_dbg_register *reg)
 442 {
 443         struct i2c_client *client = v4l2_get_subdevdata(sd);
 444
 445         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 446                 return -EINVAL;
 447
 448         if (reg->match.addr != client->addr)
 449                 return -ENODEV;
 450
 451         if (reg_write(client, reg->reg, reg->val) < 0)
 452                 return -EIO;
 453
 454         return 0;
 455 }
 456 #endif
 457
 458 static int mt9t031_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 459 {
 460         struct mt9t031 *mt9t031 = container_of(ctrl->handler,
 461                                                struct mt9t031, hdl);
 462         const u32 shutter_max = MT9T031_MAX_HEIGHT + MT9T031_VERTICAL_BLANK;
 463         s32 min, max;
 464
 465         switch (ctrl->id) {
 466         case V4L2_CID_EXPOSURE_AUTO:
 467                 min = mt9t031->exposure->minimum;
 468                 max = mt9t031->exposure->maximum;
 469                 mt9t031->exposure->val =
 470                         (shutter_max / 2 + (mt9t031->total_h - 1) * (max - min))
 471                                 / shutter_max + min;
 472                 break;
 473         }
 474         return 0;
 475 }
 476
 477 static int mt9t031_s_ctrl(struct v4l2_ctrl *ctrl)
 478 {
 479         struct mt9t031 *mt9t031 = container_of(ctrl->handler,
 480                                                struct mt9t031, hdl);
 481         struct v4l2_subdev *sd = &mt9t031->subdev;
 482         struct i2c_client *client = v4l2_get_subdevdata(sd);
 483         struct v4l2_ctrl *exp = mt9t031->exposure;
 484         int data;
 485
 486         switch (ctrl->id) {
 487         case V4L2_CID_VFLIP:
 488                 if (ctrl->val)
 489                         data = reg_set(client, MT9T031_READ_MODE_2, 0x8000);
 490                 else
 491                         data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000);
 492                 if (data < 0)
 493                         return -EIO;
 494                 return 0;
 495         case V4L2_CID_HFLIP:
 496                 if (ctrl->val)
 497                         data = reg_set(client, MT9T031_READ_MODE_2, 0x4000);
 498                 else
 499                         data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000);
 500                 if (data < 0)
 501                         return -EIO;
 502                 return 0;
 503         case V4L2_CID_GAIN:
 504                 /* See Datasheet Table 7, Gain settings. */
 505                 if (ctrl->val <= ctrl->default_value) {
 506                         /* Pack it into 0..1 step 0.125, register values 0..8 */
 507                         unsigned long range = ctrl->default_value - ctrl->minimum;
 508                         data = ((ctrl->val - ctrl->minimum) * 8 + range / 2) / range;
 509
 510                         dev_dbg(&client->dev, "Setting gain %d\n", data);
 511                         data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
 512                         if (data < 0)
 513                                 return -EIO;
 514                 } else {
 515                         /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
 516                         /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
 517                         unsigned long range = ctrl->maximum - ctrl->default_value - 1;
 518                         /* calculated gain: map 65..127 to 9..1024 step 0.125 */
 519                         unsigned long gain = ((ctrl->val - ctrl->default_value - 1) *
 520                                                1015 + range / 2) / range + 9;
 521
 522                         if (gain <= 32)         /* calculated gain 9..32 -> 9..32 */
 523                                 data = gain;
 524                         else if (gain <= 64)    /* calculated gain 33..64 -> 0x51..0x60 */
 525                                 data = ((gain - 32) * 16 + 16) / 32 + 80;
 526                         else
 527                                 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
 528                                 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
 529
 530                         dev_dbg(&client->dev, "Set gain from 0x%x to 0x%x\n",
 531                                 reg_read(client, MT9T031_GLOBAL_GAIN), data);
 532                         data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
 533                         if (data < 0)
 534                                 return -EIO;
 535                 }
 536                 return 0;
 537
 538         case V4L2_CID_EXPOSURE_AUTO:
 539                 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
 540                         unsigned int range = exp->maximum - exp->minimum;
 541                         unsigned int shutter = ((exp->val - exp->minimum) * 1048 +
 542                                                  range / 2) / range + 1;
 543                         u32 old;
 544
 545                         get_shutter(client, &old);
 546                         dev_dbg(&client->dev, "Set shutter from %u to %u\n",
 547                                 old, shutter);
 548                         if (set_shutter(client, shutter) < 0)
 549                                 return -EIO;
 550                 } else {
 551                         const u16 vblank = MT9T031_VERTICAL_BLANK;
 552                         mt9t031->total_h = mt9t031->rect.height +
 553                                 mt9t031->y_skip_top + vblank;
 554
 555                         if (set_shutter(client, mt9t031->total_h) < 0)
 556                                 return -EIO;
 557                 }
 558                 return 0;
 559         default:
 560                 return -EINVAL;
 561         }
 562         return 0;
 563 }
 564
 565 /*
 566  * Power Management:
 567  * This function does nothing for now but must be present for pm to work
 568  */
 569 static int mt9t031_runtime_suspend(struct device *dev)
 570 {
 571         return 0;
 572 }
 573
 574 /*
 575  * Power Management:
 576  * COLUMN_ADDRESS_MODE and ROW_ADDRESS_MODE are not rewritten if unchanged
 577  * they are however changed at reset if the platform hook is present
 578  * thus we rewrite them with the values stored by the driver
 579  */
 580 static int mt9t031_runtime_resume(struct device *dev)
 581 {
 582         struct video_device *vdev = to_video_device(dev);
 583         struct v4l2_subdev *sd = soc_camera_vdev_to_subdev(vdev);
 584         struct i2c_client *client = v4l2_get_subdevdata(sd);
 585         struct mt9t031 *mt9t031 = to_mt9t031(client);
 586
 587         int ret;
 588         u16 xbin, ybin;
 589
 590         xbin = min(mt9t031->xskip, (u16)3);
 591         ybin = min(mt9t031->yskip, (u16)3);
 592
 593         ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
 594                 ((xbin - 1) << 4) | (mt9t031->xskip - 1));
 595         if (ret < 0)
 596                 return ret;
 597
 598         ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
 599                 ((ybin - 1) << 4) | (mt9t031->yskip - 1));
 600         if (ret < 0)
 601                 return ret;
 602
 603         return 0;
 604 }
 605
 606 static struct dev_pm_ops mt9t031_dev_pm_ops = {
 607         .runtime_suspend        = mt9t031_runtime_suspend,
 608         .runtime_resume         = mt9t031_runtime_resume,
 609 };
 610
 611 static struct device_type mt9t031_dev_type = {
 612         .name   = "MT9T031",
 613         .pm     = &mt9t031_dev_pm_ops,
 614 };
 615
 616 static int mt9t031_s_power(struct v4l2_subdev *sd, int on)
 617 {
 618         struct i2c_client *client = v4l2_get_subdevdata(sd);
 619         struct video_device *vdev = soc_camera_i2c_to_vdev(client);
 620
 621         if (on)
 622                 vdev->dev.type = &mt9t031_dev_type;
 623         else
 624                 vdev->dev.type = NULL;
 625
 626         return 0;
 627 }
 628
 629 /*
 630  * Interface active, can use i2c. If it fails, it can indeed mean, that
 631  * this wasn't our capture interface, so, we wait for the right one
 632  */
 633 static int mt9t031_video_probe(struct i2c_client *client)
 634 {
 635         struct mt9t031 *mt9t031 = to_mt9t031(client);
 636         s32 data;
 637         int ret;
 638
 639         /* Enable the chip */
 640         data = reg_write(client, MT9T031_CHIP_ENABLE, 1);
 641         dev_dbg(&client->dev, "write: %d\n", data);
 642
 643         /* Read out the chip version register */
 644         data = reg_read(client, MT9T031_CHIP_VERSION);
 645
 646         switch (data) {
 647         case 0x1621:
 648                 mt9t031->model = V4L2_IDENT_MT9T031;
 649                 break;
 650         default:
 651                 dev_err(&client->dev,
 652                         "No MT9T031 chip detected, register read %x\n", data);
 653                 return -ENODEV;
 654         }
 655
 656         dev_info(&client->dev, "Detected a MT9T031 chip ID %x\n", data);
 657
 658         ret = mt9t031_idle(client);
 659         if (ret < 0)
 660                 dev_err(&client->dev, "Failed to initialise the camera\n");
 661         else
 662                 v4l2_ctrl_handler_setup(&mt9t031->hdl);
 663
 664         return ret;
 665 }
 666
 667 static int mt9t031_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
 668 {
 669         struct i2c_client *client = v4l2_get_subdevdata(sd);
 670         struct mt9t031 *mt9t031 = to_mt9t031(client);
 671
 672         *lines = mt9t031->y_skip_top;
 673
 674         return 0;
 675 }
 676
 677 static const struct v4l2_ctrl_ops mt9t031_ctrl_ops = {
 678         .g_volatile_ctrl = mt9t031_g_volatile_ctrl,
 679         .s_ctrl = mt9t031_s_ctrl,
 680 };
 681
 682 static struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = {
 683         .g_chip_ident   = mt9t031_g_chip_ident,
 684         .s_power        = mt9t031_s_power,
 685 #ifdef CONFIG_VIDEO_ADV_DEBUG
 686         .g_register     = mt9t031_g_register,
 687         .s_register     = mt9t031_s_register,
 688 #endif
 689 };
 690
 691 static int mt9t031_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
 692                             enum v4l2_mbus_pixelcode *code)
 693 {
 694         if (index)
 695                 return -EINVAL;
 696
 697         *code = V4L2_MBUS_FMT_SBGGR10_1X10;
 698         return 0;
 699 }
 700
 701 static int mt9t031_g_mbus_config(struct v4l2_subdev *sd,
 702                                 struct v4l2_mbus_config *cfg)
 703 {
 704         struct i2c_client *client = v4l2_get_subdevdata(sd);
 705         struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 706
 707         cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_PCLK_SAMPLE_RISING |
 708                 V4L2_MBUS_PCLK_SAMPLE_FALLING | V4L2_MBUS_HSYNC_ACTIVE_HIGH |
 709                 V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_HIGH;
 710         cfg->type = V4L2_MBUS_PARALLEL;
 711         cfg->flags = soc_camera_apply_board_flags(icl, cfg);
 712
 713         return 0;
 714 }
 715
 716 static int mt9t031_s_mbus_config(struct v4l2_subdev *sd,
 717                                 const struct v4l2_mbus_config *cfg)
 718 {
 719         struct i2c_client *client = v4l2_get_subdevdata(sd);
 720         struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 721
 722         if (soc_camera_apply_board_flags(icl, cfg) &
 723             V4L2_MBUS_PCLK_SAMPLE_FALLING)
 724                 return reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
 725         else
 726                 return reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
 727 }
 728
 729 static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = {
 730         .s_stream       = mt9t031_s_stream,
 731         .s_mbus_fmt     = mt9t031_s_fmt,
 732         .g_mbus_fmt     = mt9t031_g_fmt,
 733         .try_mbus_fmt   = mt9t031_try_fmt,
 734         .s_crop         = mt9t031_s_crop,
 735         .g_crop         = mt9t031_g_crop,
 736         .cropcap        = mt9t031_cropcap,
 737         .enum_mbus_fmt  = mt9t031_enum_fmt,
 738         .g_mbus_config  = mt9t031_g_mbus_config,
 739         .s_mbus_config  = mt9t031_s_mbus_config,
 740 };
 741
 742 static struct v4l2_subdev_sensor_ops mt9t031_subdev_sensor_ops = {
 743         .g_skip_top_lines       = mt9t031_g_skip_top_lines,
 744 };
 745
 746 static struct v4l2_subdev_ops mt9t031_subdev_ops = {
 747         .core   = &mt9t031_subdev_core_ops,
 748         .video  = &mt9t031_subdev_video_ops,
 749         .sensor = &mt9t031_subdev_sensor_ops,
 750 };
 751
 752 static int mt9t031_probe(struct i2c_client *client,
 753                          const struct i2c_device_id *did)
 754 {
 755         struct mt9t031 *mt9t031;
 756         struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 757         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 758         int ret;
 759
 760         if (!icl) {
 761                 dev_err(&client->dev, "MT9T031 driver needs platform data\n");
 762                 return -EINVAL;
 763         }
 764
 765         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
 766                 dev_warn(&adapter->dev,
 767                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
 768                 return -EIO;
 769         }
 770
 771         mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
 772         if (!mt9t031)
 773                 return -ENOMEM;
 774
 775         v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops);
 776         v4l2_ctrl_handler_init(&mt9t031->hdl, 5);
 777         v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
 778                         V4L2_CID_VFLIP, 0, 1, 1, 0);
 779         v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
 780                         V4L2_CID_HFLIP, 0, 1, 1, 0);
 781         v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
 782                         V4L2_CID_GAIN, 0, 127, 1, 64);
 783
 784         /*
 785          * Simulated autoexposure. If enabled, we calculate shutter width
 786          * ourselves in the driver based on vertical blanking and frame width
 787          */
 788         mt9t031->autoexposure = v4l2_ctrl_new_std_menu(&mt9t031->hdl,
 789                         &mt9t031_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
 790                         V4L2_EXPOSURE_AUTO);
 791         mt9t031->exposure = v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
 792                         V4L2_CID_EXPOSURE, 1, 255, 1, 255);
 793
 794         mt9t031->subdev.ctrl_handler = &mt9t031->hdl;
 795         if (mt9t031->hdl.error) {
 796                 int err = mt9t031->hdl.error;
 797
 798                 kfree(mt9t031);
 799                 return err;
 800         }
 801         v4l2_ctrl_auto_cluster(2, &mt9t031->autoexposure,
 802                                 V4L2_EXPOSURE_MANUAL, true);
 803
 804         mt9t031->y_skip_top     = 0;
 805         mt9t031->rect.left      = MT9T031_COLUMN_SKIP;
 806         mt9t031->rect.top       = MT9T031_ROW_SKIP;
 807         mt9t031->rect.width     = MT9T031_MAX_WIDTH;
 808         mt9t031->rect.height    = MT9T031_MAX_HEIGHT;
 809
 810         mt9t031->xskip = 1;
 811         mt9t031->yskip = 1;
 812
 813         mt9t031_idle(client);
 814
 815         ret = mt9t031_video_probe(client);
 816
 817         mt9t031_disable(client);
 818
 819         if (ret) {
 820                 v4l2_ctrl_handler_free(&mt9t031->hdl);
 821                 kfree(mt9t031);
 822         }
 823
 824         return ret;
 825 }
 826
 827 static int mt9t031_remove(struct i2c_client *client)
 828 {
 829         struct mt9t031 *mt9t031 = to_mt9t031(client);
 830
 831         v4l2_device_unregister_subdev(&mt9t031->subdev);
 832         v4l2_ctrl_handler_free(&mt9t031->hdl);
 833         kfree(mt9t031);
 834
 835         return 0;
 836 }
 837
 838 static const struct i2c_device_id mt9t031_id[] = {
 839         { "mt9t031", 0 },
 840         { }
 841 };
 842 MODULE_DEVICE_TABLE(i2c, mt9t031_id);
 843
 844 static struct i2c_driver mt9t031_i2c_driver = {
 845         .driver = {
 846                 .name = "mt9t031",
 847         },
 848         .probe          = mt9t031_probe,
 849         .remove         = mt9t031_remove,
 850         .id_table       = mt9t031_id,
 851 };
 852
 853 module_i2c_driver(mt9t031_i2c_driver);
 854
 855 MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
 856 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
 857 MODULE_LICENSE("GPL v2");