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         s32 data = i2c_smbus_read_word_data(client, reg);
  94         return data < 0 ? data : swab16(data);
  95 }
  96
  97 static int reg_write(struct i2c_client *client, const u8 reg,
  98                      const u16 data)
  99 {
 100         return i2c_smbus_write_word_data(client, reg, swab16(data));
 101 }
 102
 103 static int reg_set(struct i2c_client *client, const u8 reg,
 104                    const u16 data)
 105 {
 106         int ret;
 107
 108         ret = reg_read(client, reg);
 109         if (ret < 0)
 110                 return ret;
 111         return reg_write(client, reg, ret | data);
 112 }
 113
 114 static int reg_clear(struct i2c_client *client, const u8 reg,
 115                      const u16 data)
 116 {
 117         int ret;
 118
 119         ret = reg_read(client, reg);
 120         if (ret < 0)
 121                 return ret;
 122         return reg_write(client, reg, ret & ~data);
 123 }
 124
 125 static int set_shutter(struct i2c_client *client, const u32 data)
 126 {
 127         int ret;
 128
 129         ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);
 130
 131         if (ret >= 0)
 132                 ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff);
 133
 134         return ret;
 135 }
 136
 137 static int get_shutter(struct i2c_client *client, u32 *data)
 138 {
 139         int ret;
 140
 141         ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER);
 142         *data = ret << 16;
 143
 144         if (ret >= 0)
 145                 ret = reg_read(client, MT9T031_SHUTTER_WIDTH);
 146         *data |= ret & 0xffff;
 147
 148         return ret < 0 ? ret : 0;
 149 }
 150
 151 static int mt9t031_idle(struct i2c_client *client)
 152 {
 153         int ret;
 154
 155         /* Disable chip output, synchronous option update */
 156         ret = reg_write(client, MT9T031_RESET, 1);
 157         if (ret >= 0)
 158                 ret = reg_write(client, MT9T031_RESET, 0);
 159         if (ret >= 0)
 160                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
 161
 162         return ret >= 0 ? 0 : -EIO;
 163 }
 164
 165 static int mt9t031_disable(struct i2c_client *client)
 166 {
 167         /* Disable the chip */
 168         reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
 169
 170         return 0;
 171 }
 172
 173 static int mt9t031_s_stream(struct v4l2_subdev *sd, int enable)
 174 {
 175         struct i2c_client *client = v4l2_get_subdevdata(sd);
 176         int ret;
 177
 178         if (enable)
 179                 /* Switch to master "normal" mode */
 180                 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 2);
 181         else
 182                 /* Stop sensor readout */
 183                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2);
 184
 185         if (ret < 0)
 186                 return -EIO;
 187
 188         return 0;
 189 }
 190
 191 /* target must be _even_ */
 192 static u16 mt9t031_skip(s32 *source, s32 target, s32 max)
 193 {
 194         unsigned int skip;
 195
 196         if (*source < target + target / 2) {
 197                 *source = target;
 198                 return 1;
 199         }
 200
 201         skip = min(max, *source + target / 2) / target;
 202         if (skip > 8)
 203                 skip = 8;
 204         *source = target * skip;
 205
 206         return skip;
 207 }
 208
 209 /* rect is the sensor rectangle, the caller guarantees parameter validity */
 210 static int mt9t031_set_params(struct i2c_client *client,
 211                               struct v4l2_rect *rect, u16 xskip, u16 yskip)
 212 {
 213         struct mt9t031 *mt9t031 = to_mt9t031(client);
 214         int ret;
 215         u16 xbin, ybin;
 216         const u16 hblank = MT9T031_HORIZONTAL_BLANK,
 217                 vblank = MT9T031_VERTICAL_BLANK;
 218
 219         xbin = min(xskip, (u16)3);
 220         ybin = min(yskip, (u16)3);
 221
 222         /*
 223          * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper.
 224          * There is always a valid suitably aligned value. The worst case is
 225          * xbin = 3, width = 2048. Then we will start at 36, the last read out
 226          * pixel will be 2083, which is < 2085 - first black pixel.
 227          *
 228          * MT9T031 datasheet imposes window left border alignment, depending on
 229          * the selected xskip. Failing to conform to this requirement produces
 230          * dark horizontal stripes in the image. However, even obeying to this
 231          * requirement doesn't eliminate the stripes in all configurations. They
 232          * appear "locally reproducibly," but can differ between tests under
 233          * different lighting conditions.
 234          */
 235         switch (xbin) {
 236         case 1:
 237                 rect->left &= ~1;
 238                 break;
 239         case 2:
 240                 rect->left &= ~3;
 241                 break;
 242         case 3:
 243                 rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ?
 244                         (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6);
 245         }
 246
 247         rect->top &= ~1;
 248
 249         dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n",
 250                 xskip, yskip, rect->width, rect->height, rect->left, rect->top);
 251
 252         /* Disable register update, reconfigure atomically */
 253         ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
 254         if (ret < 0)
 255                 return ret;
 256
 257         /* Blanking and start values - default... */
 258         ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank);
 259         if (ret >= 0)
 260                 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank);
 261
 262         if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) {
 263                 /* Binning, skipping */
 264                 if (ret >= 0)
 265                         ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
 266                                         ((xbin - 1) << 4) | (xskip - 1));
 267                 if (ret >= 0)
 268                         ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
 269                                         ((ybin - 1) << 4) | (yskip - 1));
 270         }
 271         dev_dbg(&client->dev, "new physical left %u, top %u\n",
 272                 rect->left, rect->top);
 273
 274         /*
 275          * The caller provides a supported format, as guaranteed by
 276          * .try_mbus_fmt(), soc_camera_s_crop() and soc_camera_cropcap()
 277          */
 278         if (ret >= 0)
 279                 ret = reg_write(client, MT9T031_COLUMN_START, rect->left);
 280         if (ret >= 0)
 281                 ret = reg_write(client, MT9T031_ROW_START, rect->top);
 282         if (ret >= 0)
 283                 ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1);
 284         if (ret >= 0)
 285                 ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
 286                                 rect->height + mt9t031->y_skip_top - 1);
 287         if (ret >= 0 && v4l2_ctrl_g_ctrl(mt9t031->autoexposure) == V4L2_EXPOSURE_AUTO) {
 288                 mt9t031->total_h = rect->height + mt9t031->y_skip_top + vblank;
 289
 290                 ret = set_shutter(client, mt9t031->total_h);
 291         }
 292
 293         /* Re-enable register update, commit all changes */
 294         if (ret >= 0)
 295                 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
 296
 297         if (ret >= 0) {
 298                 mt9t031->rect = *rect;
 299                 mt9t031->xskip = xskip;
 300                 mt9t031->yskip = yskip;
 301         }
 302
 303         return ret < 0 ? ret : 0;
 304 }
 305
 306 static int mt9t031_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
 307 {
 308         struct v4l2_rect rect = a->c;
 309         struct i2c_client *client = v4l2_get_subdevdata(sd);
 310         struct mt9t031 *mt9t031 = to_mt9t031(client);
 311
 312         rect.width = ALIGN(rect.width, 2);
 313         rect.height = ALIGN(rect.height, 2);
 314
 315         soc_camera_limit_side(&rect.left, &rect.width,
 316                      MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH);
 317
 318         soc_camera_limit_side(&rect.top, &rect.height,
 319                      MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT);
 320
 321         return mt9t031_set_params(client, &rect, mt9t031->xskip, mt9t031->yskip);
 322 }
 323
 324 static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
 325 {
 326         struct i2c_client *client = v4l2_get_subdevdata(sd);
 327         struct mt9t031 *mt9t031 = to_mt9t031(client);
 328
 329         a->c    = mt9t031->rect;
 330         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 331
 332         return 0;
 333 }
 334
 335 static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
 336 {
 337         a->bounds.left                  = MT9T031_COLUMN_SKIP;
 338         a->bounds.top                   = MT9T031_ROW_SKIP;
 339         a->bounds.width                 = MT9T031_MAX_WIDTH;
 340         a->bounds.height                = MT9T031_MAX_HEIGHT;
 341         a->defrect                      = a->bounds;
 342         a->type                         = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 343         a->pixelaspect.numerator        = 1;
 344         a->pixelaspect.denominator      = 1;
 345
 346         return 0;
 347 }
 348
 349 static int mt9t031_g_fmt(struct v4l2_subdev *sd,
 350                          struct v4l2_mbus_framefmt *mf)
 351 {
 352         struct i2c_client *client = v4l2_get_subdevdata(sd);
 353         struct mt9t031 *mt9t031 = to_mt9t031(client);
 354
 355         mf->width       = mt9t031->rect.width / mt9t031->xskip;
 356         mf->height      = mt9t031->rect.height / mt9t031->yskip;
 357         mf->code        = V4L2_MBUS_FMT_SBGGR10_1X10;
 358         mf->colorspace  = V4L2_COLORSPACE_SRGB;
 359         mf->field       = V4L2_FIELD_NONE;
 360
 361         return 0;
 362 }
 363
 364 static int mt9t031_s_fmt(struct v4l2_subdev *sd,
 365                          struct v4l2_mbus_framefmt *mf)
 366 {
 367         struct i2c_client *client = v4l2_get_subdevdata(sd);
 368         struct mt9t031 *mt9t031 = to_mt9t031(client);
 369         u16 xskip, yskip;
 370         struct v4l2_rect rect = mt9t031->rect;
 371
 372         /*
 373          * try_fmt has put width and height within limits.
 374          * S_FMT: use binning and skipping for scaling
 375          */
 376         xskip = mt9t031_skip(&rect.width, mf->width, MT9T031_MAX_WIDTH);
 377         yskip = mt9t031_skip(&rect.height, mf->height, MT9T031_MAX_HEIGHT);
 378
 379         mf->code        = V4L2_MBUS_FMT_SBGGR10_1X10;
 380         mf->colorspace  = V4L2_COLORSPACE_SRGB;
 381
 382         /* mt9t031_set_params() doesn't change width and height */
 383         return mt9t031_set_params(client, &rect, xskip, yskip);
 384 }
 385
 386 /*
 387  * If a user window larger than sensor window is requested, we'll increase the
 388  * sensor window.
 389  */
 390 static int mt9t031_try_fmt(struct v4l2_subdev *sd,
 391                            struct v4l2_mbus_framefmt *mf)
 392 {
 393         v4l_bound_align_image(
 394                 &mf->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1,
 395                 &mf->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0);
 396
 397         mf->code        = V4L2_MBUS_FMT_SBGGR10_1X10;
 398         mf->colorspace  = V4L2_COLORSPACE_SRGB;
 399
 400         return 0;
 401 }
 402
 403 static int mt9t031_g_chip_ident(struct v4l2_subdev *sd,
 404                                 struct v4l2_dbg_chip_ident *id)
 405 {
 406         struct i2c_client *client = v4l2_get_subdevdata(sd);
 407         struct mt9t031 *mt9t031 = to_mt9t031(client);
 408
 409         if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
 410                 return -EINVAL;
 411
 412         if (id->match.addr != client->addr)
 413                 return -ENODEV;
 414
 415         id->ident       = mt9t031->model;
 416         id->revision    = 0;
 417
 418         return 0;
 419 }
 420
 421 #ifdef CONFIG_VIDEO_ADV_DEBUG
 422 static int mt9t031_g_register(struct v4l2_subdev *sd,
 423                               struct v4l2_dbg_register *reg)
 424 {
 425         struct i2c_client *client = v4l2_get_subdevdata(sd);
 426
 427         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 428                 return -EINVAL;
 429
 430         if (reg->match.addr != client->addr)
 431                 return -ENODEV;
 432
 433         reg->val = reg_read(client, reg->reg);
 434
 435         if (reg->val > 0xffff)
 436                 return -EIO;
 437
 438         return 0;
 439 }
 440
 441 static int mt9t031_s_register(struct v4l2_subdev *sd,
 442                               struct v4l2_dbg_register *reg)
 443 {
 444         struct i2c_client *client = v4l2_get_subdevdata(sd);
 445
 446         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 447                 return -EINVAL;
 448
 449         if (reg->match.addr != client->addr)
 450                 return -ENODEV;
 451
 452         if (reg_write(client, reg->reg, reg->val) < 0)
 453                 return -EIO;
 454
 455         return 0;
 456 }
 457 #endif
 458
 459 static int mt9t031_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 460 {
 461         struct mt9t031 *mt9t031 = container_of(ctrl->handler,
 462                                                struct mt9t031, hdl);
 463         const u32 shutter_max = MT9T031_MAX_HEIGHT + MT9T031_VERTICAL_BLANK;
 464         s32 min, max;
 465
 466         switch (ctrl->id) {
 467         case V4L2_CID_EXPOSURE_AUTO:
 468                 min = mt9t031->exposure->minimum;
 469                 max = mt9t031->exposure->maximum;
 470                 mt9t031->exposure->val =
 471                         (shutter_max / 2 + (mt9t031->total_h - 1) * (max - min))
 472                                 / shutter_max + min;
 473                 break;
 474         }
 475         return 0;
 476 }
 477
 478 static int mt9t031_s_ctrl(struct v4l2_ctrl *ctrl)
 479 {
 480         struct mt9t031 *mt9t031 = container_of(ctrl->handler,
 481                                                struct mt9t031, hdl);
 482         struct v4l2_subdev *sd = &mt9t031->subdev;
 483         struct i2c_client *client = v4l2_get_subdevdata(sd);
 484         struct v4l2_ctrl *exp = mt9t031->exposure;
 485         int data;
 486
 487         switch (ctrl->id) {
 488         case V4L2_CID_VFLIP:
 489                 if (ctrl->val)
 490                         data = reg_set(client, MT9T031_READ_MODE_2, 0x8000);
 491                 else
 492                         data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000);
 493                 if (data < 0)
 494                         return -EIO;
 495                 return 0;
 496         case V4L2_CID_HFLIP:
 497                 if (ctrl->val)
 498                         data = reg_set(client, MT9T031_READ_MODE_2, 0x4000);
 499                 else
 500                         data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000);
 501                 if (data < 0)
 502                         return -EIO;
 503                 return 0;
 504         case V4L2_CID_GAIN:
 505                 /* See Datasheet Table 7, Gain settings. */
 506                 if (ctrl->val <= ctrl->default_value) {
 507                         /* Pack it into 0..1 step 0.125, register values 0..8 */
 508                         unsigned long range = ctrl->default_value - ctrl->minimum;
 509                         data = ((ctrl->val - ctrl->minimum) * 8 + range / 2) / range;
 510
 511                         dev_dbg(&client->dev, "Setting gain %d\n", data);
 512                         data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
 513                         if (data < 0)
 514                                 return -EIO;
 515                 } else {
 516                         /* Pack it into 1.125..128 variable step, register values 9..0x7860 */
 517                         /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
 518                         unsigned long range = ctrl->maximum - ctrl->default_value - 1;
 519                         /* calculated gain: map 65..127 to 9..1024 step 0.125 */
 520                         unsigned long gain = ((ctrl->val - ctrl->default_value - 1) *
 521                                                1015 + range / 2) / range + 9;
 522
 523                         if (gain <= 32)         /* calculated gain 9..32 -> 9..32 */
 524                                 data = gain;
 525                         else if (gain <= 64)    /* calculated gain 33..64 -> 0x51..0x60 */
 526                                 data = ((gain - 32) * 16 + 16) / 32 + 80;
 527                         else
 528                                 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
 529                                 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
 530
 531                         dev_dbg(&client->dev, "Set gain from 0x%x to 0x%x\n",
 532                                 reg_read(client, MT9T031_GLOBAL_GAIN), data);
 533                         data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
 534                         if (data < 0)
 535                                 return -EIO;
 536                 }
 537                 return 0;
 538
 539         case V4L2_CID_EXPOSURE_AUTO:
 540                 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
 541                         unsigned int range = exp->maximum - exp->minimum;
 542                         unsigned int shutter = ((exp->val - exp->minimum) * 1048 +
 543                                                  range / 2) / range + 1;
 544                         u32 old;
 545
 546                         get_shutter(client, &old);
 547                         dev_dbg(&client->dev, "Set shutter from %u to %u\n",
 548                                 old, shutter);
 549                         if (set_shutter(client, shutter) < 0)
 550                                 return -EIO;
 551                 } else {
 552                         const u16 vblank = MT9T031_VERTICAL_BLANK;
 553                         mt9t031->total_h = mt9t031->rect.height +
 554                                 mt9t031->y_skip_top + vblank;
 555
 556                         if (set_shutter(client, mt9t031->total_h) < 0)
 557                                 return -EIO;
 558                 }
 559                 return 0;
 560         default:
 561                 return -EINVAL;
 562         }
 563         return 0;
 564 }
 565
 566 /*
 567  * Power Management:
 568  * This function does nothing for now but must be present for pm to work
 569  */
 570 static int mt9t031_runtime_suspend(struct device *dev)
 571 {
 572         return 0;
 573 }
 574
 575 /*
 576  * Power Management:
 577  * COLUMN_ADDRESS_MODE and ROW_ADDRESS_MODE are not rewritten if unchanged
 578  * they are however changed at reset if the platform hook is present
 579  * thus we rewrite them with the values stored by the driver
 580  */
 581 static int mt9t031_runtime_resume(struct device *dev)
 582 {
 583         struct video_device *vdev = to_video_device(dev);
 584         struct v4l2_subdev *sd = soc_camera_vdev_to_subdev(vdev);
 585         struct i2c_client *client = v4l2_get_subdevdata(sd);
 586         struct mt9t031 *mt9t031 = to_mt9t031(client);
 587
 588         int ret;
 589         u16 xbin, ybin;
 590
 591         xbin = min(mt9t031->xskip, (u16)3);
 592         ybin = min(mt9t031->yskip, (u16)3);
 593
 594         ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE,
 595                 ((xbin - 1) << 4) | (mt9t031->xskip - 1));
 596         if (ret < 0)
 597                 return ret;
 598
 599         ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
 600                 ((ybin - 1) << 4) | (mt9t031->yskip - 1));
 601         if (ret < 0)
 602                 return ret;
 603
 604         return 0;
 605 }
 606
 607 static struct dev_pm_ops mt9t031_dev_pm_ops = {
 608         .runtime_suspend        = mt9t031_runtime_suspend,
 609         .runtime_resume         = mt9t031_runtime_resume,
 610 };
 611
 612 static struct device_type mt9t031_dev_type = {
 613         .name   = "MT9T031",
 614         .pm     = &mt9t031_dev_pm_ops,
 615 };
 616
 617 static int mt9t031_s_power(struct v4l2_subdev *sd, int on)
 618 {
 619         struct i2c_client *client = v4l2_get_subdevdata(sd);
 620         struct video_device *vdev = soc_camera_i2c_to_vdev(client);
 621
 622         if (on)
 623                 vdev->dev.type = &mt9t031_dev_type;
 624         else
 625                 vdev->dev.type = NULL;
 626
 627         return 0;
 628 }
 629
 630 /*
 631  * Interface active, can use i2c. If it fails, it can indeed mean, that
 632  * this wasn't our capture interface, so, we wait for the right one
 633  */
 634 static int mt9t031_video_probe(struct i2c_client *client)
 635 {
 636         struct mt9t031 *mt9t031 = to_mt9t031(client);
 637         s32 data;
 638         int ret;
 639
 640         /* Enable the chip */
 641         data = reg_write(client, MT9T031_CHIP_ENABLE, 1);
 642         dev_dbg(&client->dev, "write: %d\n", data);
 643
 644         /* Read out the chip version register */
 645         data = reg_read(client, MT9T031_CHIP_VERSION);
 646
 647         switch (data) {
 648         case 0x1621:
 649                 mt9t031->model = V4L2_IDENT_MT9T031;
 650                 break;
 651         default:
 652                 dev_err(&client->dev,
 653                         "No MT9T031 chip detected, register read %x\n", data);
 654                 return -ENODEV;
 655         }
 656
 657         dev_info(&client->dev, "Detected a MT9T031 chip ID %x\n", data);
 658
 659         ret = mt9t031_idle(client);
 660         if (ret < 0)
 661                 dev_err(&client->dev, "Failed to initialise the camera\n");
 662         else
 663                 v4l2_ctrl_handler_setup(&mt9t031->hdl);
 664
 665         return ret;
 666 }
 667
 668 static int mt9t031_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
 669 {
 670         struct i2c_client *client = v4l2_get_subdevdata(sd);
 671         struct mt9t031 *mt9t031 = to_mt9t031(client);
 672
 673         *lines = mt9t031->y_skip_top;
 674
 675         return 0;
 676 }
 677
 678 static const struct v4l2_ctrl_ops mt9t031_ctrl_ops = {
 679         .g_volatile_ctrl = mt9t031_g_volatile_ctrl,
 680         .s_ctrl = mt9t031_s_ctrl,
 681 };
 682
 683 static struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = {
 684         .g_chip_ident   = mt9t031_g_chip_ident,
 685         .s_power        = mt9t031_s_power,
 686 #ifdef CONFIG_VIDEO_ADV_DEBUG
 687         .g_register     = mt9t031_g_register,
 688         .s_register     = mt9t031_s_register,
 689 #endif
 690 };
 691
 692 static int mt9t031_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
 693                             enum v4l2_mbus_pixelcode *code)
 694 {
 695         if (index)
 696                 return -EINVAL;
 697
 698         *code = V4L2_MBUS_FMT_SBGGR10_1X10;
 699         return 0;
 700 }
 701
 702 static int mt9t031_g_mbus_config(struct v4l2_subdev *sd,
 703                                 struct v4l2_mbus_config *cfg)
 704 {
 705         struct i2c_client *client = v4l2_get_subdevdata(sd);
 706         struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 707
 708         cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_PCLK_SAMPLE_RISING |
 709                 V4L2_MBUS_PCLK_SAMPLE_FALLING | V4L2_MBUS_HSYNC_ACTIVE_HIGH |
 710                 V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_HIGH;
 711         cfg->type = V4L2_MBUS_PARALLEL;
 712         cfg->flags = soc_camera_apply_board_flags(icl, cfg);
 713
 714         return 0;
 715 }
 716
 717 static int mt9t031_s_mbus_config(struct v4l2_subdev *sd,
 718                                 const struct v4l2_mbus_config *cfg)
 719 {
 720         struct i2c_client *client = v4l2_get_subdevdata(sd);
 721         struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 722
 723         if (soc_camera_apply_board_flags(icl, cfg) &
 724             V4L2_MBUS_PCLK_SAMPLE_FALLING)
 725                 return reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
 726         else
 727                 return reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
 728 }
 729
 730 static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = {
 731         .s_stream       = mt9t031_s_stream,
 732         .s_mbus_fmt     = mt9t031_s_fmt,
 733         .g_mbus_fmt     = mt9t031_g_fmt,
 734         .try_mbus_fmt   = mt9t031_try_fmt,
 735         .s_crop         = mt9t031_s_crop,
 736         .g_crop         = mt9t031_g_crop,
 737         .cropcap        = mt9t031_cropcap,
 738         .enum_mbus_fmt  = mt9t031_enum_fmt,
 739         .g_mbus_config  = mt9t031_g_mbus_config,
 740         .s_mbus_config  = mt9t031_s_mbus_config,
 741 };
 742
 743 static struct v4l2_subdev_sensor_ops mt9t031_subdev_sensor_ops = {
 744         .g_skip_top_lines       = mt9t031_g_skip_top_lines,
 745 };
 746
 747 static struct v4l2_subdev_ops mt9t031_subdev_ops = {
 748         .core   = &mt9t031_subdev_core_ops,
 749         .video  = &mt9t031_subdev_video_ops,
 750         .sensor = &mt9t031_subdev_sensor_ops,
 751 };
 752
 753 static int mt9t031_probe(struct i2c_client *client,
 754                          const struct i2c_device_id *did)
 755 {
 756         struct mt9t031 *mt9t031;
 757         struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 758         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 759         int ret;
 760
 761         if (!icl) {
 762                 dev_err(&client->dev, "MT9T031 driver needs platform data\n");
 763                 return -EINVAL;
 764         }
 765
 766         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
 767                 dev_warn(&adapter->dev,
 768                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
 769                 return -EIO;
 770         }
 771
 772         mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
 773         if (!mt9t031)
 774                 return -ENOMEM;
 775
 776         v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops);
 777         v4l2_ctrl_handler_init(&mt9t031->hdl, 5);
 778         v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
 779                         V4L2_CID_VFLIP, 0, 1, 1, 0);
 780         v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
 781                         V4L2_CID_HFLIP, 0, 1, 1, 0);
 782         v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
 783                         V4L2_CID_GAIN, 0, 127, 1, 64);
 784
 785         /*
 786          * Simulated autoexposure. If enabled, we calculate shutter width
 787          * ourselves in the driver based on vertical blanking and frame width
 788          */
 789         mt9t031->autoexposure = v4l2_ctrl_new_std_menu(&mt9t031->hdl,
 790                         &mt9t031_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
 791                         V4L2_EXPOSURE_AUTO);
 792         mt9t031->exposure = v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops,
 793                         V4L2_CID_EXPOSURE, 1, 255, 1, 255);
 794
 795         mt9t031->subdev.ctrl_handler = &mt9t031->hdl;
 796         if (mt9t031->hdl.error) {
 797                 int err = mt9t031->hdl.error;
 798
 799                 kfree(mt9t031);
 800                 return err;
 801         }
 802         v4l2_ctrl_auto_cluster(2, &mt9t031->autoexposure,
 803                                 V4L2_EXPOSURE_MANUAL, true);
 804
 805         mt9t031->y_skip_top     = 0;
 806         mt9t031->rect.left      = MT9T031_COLUMN_SKIP;
 807         mt9t031->rect.top       = MT9T031_ROW_SKIP;
 808         mt9t031->rect.width     = MT9T031_MAX_WIDTH;
 809         mt9t031->rect.height    = MT9T031_MAX_HEIGHT;
 810
 811         mt9t031->xskip = 1;
 812         mt9t031->yskip = 1;
 813
 814         mt9t031_idle(client);
 815
 816         ret = mt9t031_video_probe(client);
 817
 818         mt9t031_disable(client);
 819
 820         if (ret) {
 821                 v4l2_ctrl_handler_free(&mt9t031->hdl);
 822                 kfree(mt9t031);
 823         }
 824
 825         return ret;
 826 }
 827
 828 static int mt9t031_remove(struct i2c_client *client)
 829 {
 830         struct mt9t031 *mt9t031 = to_mt9t031(client);
 831
 832         v4l2_device_unregister_subdev(&mt9t031->subdev);
 833         v4l2_ctrl_handler_free(&mt9t031->hdl);
 834         kfree(mt9t031);
 835
 836         return 0;
 837 }
 838
 839 static const struct i2c_device_id mt9t031_id[] = {
 840         { "mt9t031", 0 },
 841         { }
 842 };
 843 MODULE_DEVICE_TABLE(i2c, mt9t031_id);
 844
 845 static struct i2c_driver mt9t031_i2c_driver = {
 846         .driver = {
 847                 .name = "mt9t031",
 848         },
 849         .probe          = mt9t031_probe,
 850         .remove         = mt9t031_remove,
 851         .id_table       = mt9t031_id,
 852 };
 853
 854 static int __init mt9t031_mod_init(void)
 855 {
 856         return i2c_add_driver(&mt9t031_i2c_driver);
 857 }
 858
 859 static void __exit mt9t031_mod_exit(void)
 860 {
 861         i2c_del_driver(&mt9t031_i2c_driver);
 862 }
 863
 864 module_init(mt9t031_mod_init);
 865 module_exit(mt9t031_mod_exit);
 866
 867 MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
 868 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
 869 MODULE_LICENSE("GPL v2");