drivers/media/video/mt9t001.c

   1 /*
   2  * Driver for MT9T001 CMOS Image Sensor from Aptina (Micron)
   3  *
   4  * Copyright (C) 2010-2011, Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   5  *
   6  * Based on the MT9M001 driver,
   7  *
   8  * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/i2c.h>
  16 #include <linux/module.h>
  17 #include <linux/log2.h>
  18 #include <linux/slab.h>
  19 #include <linux/videodev2.h>
  20 #include <linux/v4l2-mediabus.h>
  21
  22 #include <media/mt9t001.h>
  23 #include <media/v4l2-ctrls.h>
  24 #include <media/v4l2-device.h>
  25 #include <media/v4l2-subdev.h>
  26
  27 #define MT9T001_PIXEL_ARRAY_HEIGHT                      1568
  28 #define MT9T001_PIXEL_ARRAY_WIDTH                       2112
  29
  30 #define MT9T001_CHIP_VERSION                            0x00
  31 #define         MT9T001_CHIP_ID                         0x1621
  32 #define MT9T001_ROW_START                               0x01
  33 #define         MT9T001_ROW_START_MIN                   0
  34 #define         MT9T001_ROW_START_DEF                   20
  35 #define         MT9T001_ROW_START_MAX                   1534
  36 #define MT9T001_COLUMN_START                            0x02
  37 #define         MT9T001_COLUMN_START_MIN                0
  38 #define         MT9T001_COLUMN_START_DEF                32
  39 #define         MT9T001_COLUMN_START_MAX                2046
  40 #define MT9T001_WINDOW_HEIGHT                           0x03
  41 #define         MT9T001_WINDOW_HEIGHT_MIN               1
  42 #define         MT9T001_WINDOW_HEIGHT_DEF               1535
  43 #define         MT9T001_WINDOW_HEIGHT_MAX               1567
  44 #define MT9T001_WINDOW_WIDTH                            0x04
  45 #define         MT9T001_WINDOW_WIDTH_MIN                1
  46 #define         MT9T001_WINDOW_WIDTH_DEF                2047
  47 #define         MT9T001_WINDOW_WIDTH_MAX                2111
  48 #define MT9T001_HORIZONTAL_BLANKING                     0x05
  49 #define         MT9T001_HORIZONTAL_BLANKING_MIN         21
  50 #define         MT9T001_HORIZONTAL_BLANKING_MAX         1023
  51 #define MT9T001_VERTICAL_BLANKING                       0x06
  52 #define         MT9T001_VERTICAL_BLANKING_MIN           3
  53 #define         MT9T001_VERTICAL_BLANKING_MAX           1023
  54 #define MT9T001_OUTPUT_CONTROL                          0x07
  55 #define         MT9T001_OUTPUT_CONTROL_SYNC             (1 << 0)
  56 #define         MT9T001_OUTPUT_CONTROL_CHIP_ENABLE      (1 << 1)
  57 #define         MT9T001_OUTPUT_CONTROL_TEST_DATA        (1 << 6)
  58 #define MT9T001_SHUTTER_WIDTH_HIGH                      0x08
  59 #define MT9T001_SHUTTER_WIDTH_LOW                       0x09
  60 #define         MT9T001_SHUTTER_WIDTH_MIN               1
  61 #define         MT9T001_SHUTTER_WIDTH_DEF               1561
  62 #define         MT9T001_SHUTTER_WIDTH_MAX               (1024 * 1024)
  63 #define MT9T001_PIXEL_CLOCK                             0x0a
  64 #define         MT9T001_PIXEL_CLOCK_INVERT              (1 << 15)
  65 #define         MT9T001_PIXEL_CLOCK_SHIFT_MASK          (7 << 8)
  66 #define         MT9T001_PIXEL_CLOCK_SHIFT_SHIFT         8
  67 #define         MT9T001_PIXEL_CLOCK_DIVIDE_MASK         (0x7f << 0)
  68 #define MT9T001_FRAME_RESTART                           0x0b
  69 #define MT9T001_SHUTTER_DELAY                           0x0c
  70 #define         MT9T001_SHUTTER_DELAY_MAX               2047
  71 #define MT9T001_RESET                                   0x0d
  72 #define MT9T001_READ_MODE1                              0x1e
  73 #define         MT9T001_READ_MODE_SNAPSHOT              (1 << 8)
  74 #define         MT9T001_READ_MODE_STROBE_ENABLE         (1 << 9)
  75 #define         MT9T001_READ_MODE_STROBE_WIDTH          (1 << 10)
  76 #define         MT9T001_READ_MODE_STROBE_OVERRIDE       (1 << 11)
  77 #define MT9T001_READ_MODE2                              0x20
  78 #define         MT9T001_READ_MODE_BAD_FRAMES            (1 << 0)
  79 #define         MT9T001_READ_MODE_LINE_VALID_CONTINUOUS (1 << 9)
  80 #define         MT9T001_READ_MODE_LINE_VALID_FRAME      (1 << 10)
  81 #define MT9T001_READ_MODE3                              0x21
  82 #define         MT9T001_READ_MODE_GLOBAL_RESET          (1 << 0)
  83 #define         MT9T001_READ_MODE_GHST_CTL              (1 << 1)
  84 #define MT9T001_ROW_ADDRESS_MODE                        0x22
  85 #define         MT9T001_ROW_SKIP_MASK                   (7 << 0)
  86 #define         MT9T001_ROW_BIN_MASK                    (3 << 3)
  87 #define         MT9T001_ROW_BIN_SHIFT                   3
  88 #define MT9T001_COLUMN_ADDRESS_MODE                     0x23
  89 #define         MT9T001_COLUMN_SKIP_MASK                (7 << 0)
  90 #define         MT9T001_COLUMN_BIN_MASK                 (3 << 3)
  91 #define         MT9T001_COLUMN_BIN_SHIFT                3
  92 #define MT9T001_GREEN1_GAIN                             0x2b
  93 #define MT9T001_BLUE_GAIN                               0x2c
  94 #define MT9T001_RED_GAIN                                0x2d
  95 #define MT9T001_GREEN2_GAIN                             0x2e
  96 #define MT9T001_TEST_DATA                               0x32
  97 #define MT9T001_GLOBAL_GAIN                             0x35
  98 #define         MT9T001_GLOBAL_GAIN_MIN                 8
  99 #define         MT9T001_GLOBAL_GAIN_MAX                 1024
 100 #define MT9T001_BLACK_LEVEL                             0x49
 101 #define MT9T001_ROW_BLACK_DEFAULT_OFFSET                0x4b
 102 #define MT9T001_BLC_DELTA_THRESHOLDS                    0x5d
 103 #define MT9T001_CAL_THRESHOLDS                          0x5f
 104 #define MT9T001_GREEN1_OFFSET                           0x60
 105 #define MT9T001_GREEN2_OFFSET                           0x61
 106 #define MT9T001_BLACK_LEVEL_CALIBRATION                 0x62
 107 #define         MT9T001_BLACK_LEVEL_OVERRIDE            (1 << 0)
 108 #define         MT9T001_BLACK_LEVEL_DISABLE_OFFSET      (1 << 1)
 109 #define         MT9T001_BLACK_LEVEL_RECALCULATE         (1 << 12)
 110 #define         MT9T001_BLACK_LEVEL_LOCK_RED_BLUE       (1 << 13)
 111 #define         MT9T001_BLACK_LEVEL_LOCK_GREEN          (1 << 14)
 112 #define MT9T001_RED_OFFSET                              0x63
 113 #define MT9T001_BLUE_OFFSET                             0x64
 114
 115 struct mt9t001 {
 116         struct v4l2_subdev subdev;
 117         struct media_pad pad;
 118
 119         struct v4l2_mbus_framefmt format;
 120         struct v4l2_rect crop;
 121
 122         struct v4l2_ctrl_handler ctrls;
 123         struct v4l2_ctrl *gains[4];
 124
 125         u16 output_control;
 126         u16 black_level;
 127 };
 128
 129 static inline struct mt9t001 *to_mt9t001(struct v4l2_subdev *sd)
 130 {
 131         return container_of(sd, struct mt9t001, subdev);
 132 }
 133
 134 static int mt9t001_read(struct i2c_client *client, u8 reg)
 135 {
 136         return i2c_smbus_read_word_swapped(client, reg);
 137 }
 138
 139 static int mt9t001_write(struct i2c_client *client, u8 reg, u16 data)
 140 {
 141         return i2c_smbus_write_word_swapped(client, reg, data);
 142 }
 143
 144 static int mt9t001_set_output_control(struct mt9t001 *mt9t001, u16 clear,
 145                                       u16 set)
 146 {
 147         struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev);
 148         u16 value = (mt9t001->output_control & ~clear) | set;
 149         int ret;
 150
 151         if (value == mt9t001->output_control)
 152                 return 0;
 153
 154         ret = mt9t001_write(client, MT9T001_OUTPUT_CONTROL, value);
 155         if (ret < 0)
 156                 return ret;
 157
 158         mt9t001->output_control = value;
 159         return 0;
 160 }
 161
 162 /* -----------------------------------------------------------------------------
 163  * V4L2 subdev video operations
 164  */
 165
 166 static struct v4l2_mbus_framefmt *
 167 __mt9t001_get_pad_format(struct mt9t001 *mt9t001, struct v4l2_subdev_fh *fh,
 168                          unsigned int pad, enum v4l2_subdev_format_whence which)
 169 {
 170         switch (which) {
 171         case V4L2_SUBDEV_FORMAT_TRY:
 172                 return v4l2_subdev_get_try_format(fh, pad);
 173         case V4L2_SUBDEV_FORMAT_ACTIVE:
 174                 return &mt9t001->format;
 175         default:
 176                 return NULL;
 177         }
 178 }
 179
 180 static struct v4l2_rect *
 181 __mt9t001_get_pad_crop(struct mt9t001 *mt9t001, struct v4l2_subdev_fh *fh,
 182                        unsigned int pad, enum v4l2_subdev_format_whence which)
 183 {
 184         switch (which) {
 185         case V4L2_SUBDEV_FORMAT_TRY:
 186                 return v4l2_subdev_get_try_crop(fh, pad);
 187         case V4L2_SUBDEV_FORMAT_ACTIVE:
 188                 return &mt9t001->crop;
 189         default:
 190                 return NULL;
 191         }
 192 }
 193
 194 static int mt9t001_s_stream(struct v4l2_subdev *subdev, int enable)
 195 {
 196         const u16 mode = MT9T001_OUTPUT_CONTROL_CHIP_ENABLE;
 197         struct i2c_client *client = v4l2_get_subdevdata(subdev);
 198         struct mt9t001 *mt9t001 = to_mt9t001(subdev);
 199         struct v4l2_mbus_framefmt *format = &mt9t001->format;
 200         struct v4l2_rect *crop = &mt9t001->crop;
 201         unsigned int hratio;
 202         unsigned int vratio;
 203         int ret;
 204
 205         if (!enable)
 206                 return mt9t001_set_output_control(mt9t001, mode, 0);
 207
 208         /* Configure the window size and row/column bin */
 209         hratio = DIV_ROUND_CLOSEST(crop->width, format->width);
 210         vratio = DIV_ROUND_CLOSEST(crop->height, format->height);
 211
 212         ret = mt9t001_write(client, MT9T001_ROW_ADDRESS_MODE, hratio - 1);
 213         if (ret < 0)
 214                 return ret;
 215
 216         ret = mt9t001_write(client, MT9T001_COLUMN_ADDRESS_MODE, vratio - 1);
 217         if (ret < 0)
 218                 return ret;
 219
 220         ret = mt9t001_write(client, MT9T001_COLUMN_START, crop->left);
 221         if (ret < 0)
 222                 return ret;
 223
 224         ret = mt9t001_write(client, MT9T001_ROW_START, crop->top);
 225         if (ret < 0)
 226                 return ret;
 227
 228         ret = mt9t001_write(client, MT9T001_WINDOW_WIDTH, crop->width - 1);
 229         if (ret < 0)
 230                 return ret;
 231
 232         ret = mt9t001_write(client, MT9T001_WINDOW_HEIGHT, crop->height - 1);
 233         if (ret < 0)
 234                 return ret;
 235
 236         /* Switch to master "normal" mode */
 237         return mt9t001_set_output_control(mt9t001, 0, mode);
 238 }
 239
 240 static int mt9t001_enum_mbus_code(struct v4l2_subdev *subdev,
 241                                   struct v4l2_subdev_fh *fh,
 242                                   struct v4l2_subdev_mbus_code_enum *code)
 243 {
 244         if (code->index > 0)
 245                 return -EINVAL;
 246
 247         code->code = V4L2_MBUS_FMT_SGRBG10_1X10;
 248         return 0;
 249 }
 250
 251 static int mt9t001_enum_frame_size(struct v4l2_subdev *subdev,
 252                                    struct v4l2_subdev_fh *fh,
 253                                    struct v4l2_subdev_frame_size_enum *fse)
 254 {
 255         if (fse->index >= 8 || fse->code != V4L2_MBUS_FMT_SGRBG10_1X10)
 256                 return -EINVAL;
 257
 258         fse->min_width = (MT9T001_WINDOW_WIDTH_DEF + 1) / fse->index;
 259         fse->max_width = fse->min_width;
 260         fse->min_height = (MT9T001_WINDOW_HEIGHT_DEF + 1) / fse->index;
 261         fse->max_height = fse->min_height;
 262
 263         return 0;
 264 }
 265
 266 static int mt9t001_get_format(struct v4l2_subdev *subdev,
 267                               struct v4l2_subdev_fh *fh,
 268                               struct v4l2_subdev_format *format)
 269 {
 270         struct mt9t001 *mt9t001 = to_mt9t001(subdev);
 271
 272         format->format = *__mt9t001_get_pad_format(mt9t001, fh, format->pad,
 273                                                    format->which);
 274         return 0;
 275 }
 276
 277 static int mt9t001_set_format(struct v4l2_subdev *subdev,
 278                               struct v4l2_subdev_fh *fh,
 279                               struct v4l2_subdev_format *format)
 280 {
 281         struct mt9t001 *mt9t001 = to_mt9t001(subdev);
 282         struct v4l2_mbus_framefmt *__format;
 283         struct v4l2_rect *__crop;
 284         unsigned int width;
 285         unsigned int height;
 286         unsigned int hratio;
 287         unsigned int vratio;
 288
 289         __crop = __mt9t001_get_pad_crop(mt9t001, fh, format->pad,
 290                                         format->which);
 291
 292         /* Clamp the width and height to avoid dividing by zero. */
 293         width = clamp_t(unsigned int, ALIGN(format->format.width, 2),
 294                         max(__crop->width / 8, MT9T001_WINDOW_HEIGHT_MIN + 1),
 295                         __crop->width);
 296         height = clamp_t(unsigned int, ALIGN(format->format.height, 2),
 297                          max(__crop->height / 8, MT9T001_WINDOW_HEIGHT_MIN + 1),
 298                          __crop->height);
 299
 300         hratio = DIV_ROUND_CLOSEST(__crop->width, width);
 301         vratio = DIV_ROUND_CLOSEST(__crop->height, height);
 302
 303         __format = __mt9t001_get_pad_format(mt9t001, fh, format->pad,
 304                                             format->which);
 305         __format->width = __crop->width / hratio;
 306         __format->height = __crop->height / vratio;
 307
 308         format->format = *__format;
 309
 310         return 0;
 311 }
 312
 313 static int mt9t001_get_crop(struct v4l2_subdev *subdev,
 314                             struct v4l2_subdev_fh *fh,
 315                             struct v4l2_subdev_crop *crop)
 316 {
 317         struct mt9t001 *mt9t001 = to_mt9t001(subdev);
 318
 319         crop->rect = *__mt9t001_get_pad_crop(mt9t001, fh, crop->pad,
 320                                              crop->which);
 321         return 0;
 322 }
 323
 324 static int mt9t001_set_crop(struct v4l2_subdev *subdev,
 325                             struct v4l2_subdev_fh *fh,
 326                             struct v4l2_subdev_crop *crop)
 327 {
 328         struct mt9t001 *mt9t001 = to_mt9t001(subdev);
 329         struct v4l2_mbus_framefmt *__format;
 330         struct v4l2_rect *__crop;
 331         struct v4l2_rect rect;
 332
 333         /* Clamp the crop rectangle boundaries and align them to a multiple of 2
 334          * pixels.
 335          */
 336         rect.left = clamp(ALIGN(crop->rect.left, 2),
 337                           MT9T001_COLUMN_START_MIN,
 338                           MT9T001_COLUMN_START_MAX);
 339         rect.top = clamp(ALIGN(crop->rect.top, 2),
 340                          MT9T001_ROW_START_MIN,
 341                          MT9T001_ROW_START_MAX);
 342         rect.width = clamp(ALIGN(crop->rect.width, 2),
 343                            MT9T001_WINDOW_WIDTH_MIN + 1,
 344                            MT9T001_WINDOW_WIDTH_MAX + 1);
 345         rect.height = clamp(ALIGN(crop->rect.height, 2),
 346                             MT9T001_WINDOW_HEIGHT_MIN + 1,
 347                             MT9T001_WINDOW_HEIGHT_MAX + 1);
 348
 349         rect.width = min(rect.width, MT9T001_PIXEL_ARRAY_WIDTH - rect.left);
 350         rect.height = min(rect.height, MT9T001_PIXEL_ARRAY_HEIGHT - rect.top);
 351
 352         __crop = __mt9t001_get_pad_crop(mt9t001, fh, crop->pad, crop->which);
 353
 354         if (rect.width != __crop->width || rect.height != __crop->height) {
 355                 /* Reset the output image size if the crop rectangle size has
 356                  * been modified.
 357                  */
 358                 __format = __mt9t001_get_pad_format(mt9t001, fh, crop->pad,
 359                                                     crop->which);
 360                 __format->width = rect.width;
 361                 __format->height = rect.height;
 362         }
 363
 364         *__crop = rect;
 365         crop->rect = rect;
 366
 367         return 0;
 368 }
 369
 370 /* -----------------------------------------------------------------------------
 371  * V4L2 subdev control operations
 372  */
 373
 374 #define V4L2_CID_TEST_PATTERN           (V4L2_CID_USER_BASE | 0x1001)
 375 #define V4L2_CID_BLACK_LEVEL_AUTO       (V4L2_CID_USER_BASE | 0x1002)
 376 #define V4L2_CID_BLACK_LEVEL_OFFSET     (V4L2_CID_USER_BASE | 0x1003)
 377 #define V4L2_CID_BLACK_LEVEL_CALIBRATE  (V4L2_CID_USER_BASE | 0x1004)
 378
 379 #define V4L2_CID_GAIN_RED               (V4L2_CTRL_CLASS_CAMERA | 0x1001)
 380 #define V4L2_CID_GAIN_GREEN_RED         (V4L2_CTRL_CLASS_CAMERA | 0x1002)
 381 #define V4L2_CID_GAIN_GREEN_BLUE        (V4L2_CTRL_CLASS_CAMERA | 0x1003)
 382 #define V4L2_CID_GAIN_BLUE              (V4L2_CTRL_CLASS_CAMERA | 0x1004)
 383
 384 static u16 mt9t001_gain_value(s32 *gain)
 385 {
 386         /* Gain is controlled by 2 analog stages and a digital stage. Valid
 387          * values for the 3 stages are
 388          *
 389          * Stage                Min     Max     Step
 390          * ------------------------------------------
 391          * First analog stage   x1      x2      1
 392          * Second analog stage  x1      x4      0.125
 393          * Digital stage        x1      x16     0.125
 394          *
 395          * To minimize noise, the gain stages should be used in the second
 396          * analog stage, first analog stage, digital stage order. Gain from a
 397          * previous stage should be pushed to its maximum value before the next
 398          * stage is used.
 399          */
 400         if (*gain <= 32)
 401                 return *gain;
 402
 403         if (*gain <= 64) {
 404                 *gain &= ~1;
 405                 return (1 << 6) | (*gain >> 1);
 406         }
 407
 408         *gain &= ~7;
 409         return ((*gain - 64) << 5) | (1 << 6) | 32;
 410 }
 411
 412 static int mt9t001_ctrl_freeze(struct mt9t001 *mt9t001, bool freeze)
 413 {
 414         return mt9t001_set_output_control(mt9t001,
 415                 freeze ? 0 : MT9T001_OUTPUT_CONTROL_SYNC,
 416                 freeze ? MT9T001_OUTPUT_CONTROL_SYNC : 0);
 417 }
 418
 419 static int mt9t001_s_ctrl(struct v4l2_ctrl *ctrl)
 420 {
 421         static const u8 gains[4] = {
 422                 MT9T001_RED_GAIN, MT9T001_GREEN1_GAIN,
 423                 MT9T001_GREEN2_GAIN, MT9T001_BLUE_GAIN
 424         };
 425
 426         struct mt9t001 *mt9t001 =
 427                         container_of(ctrl->handler, struct mt9t001, ctrls);
 428         struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev);
 429         unsigned int count;
 430         unsigned int i;
 431         u16 value;
 432         int ret;
 433
 434         switch (ctrl->id) {
 435         case V4L2_CID_GAIN_RED:
 436         case V4L2_CID_GAIN_GREEN_RED:
 437         case V4L2_CID_GAIN_GREEN_BLUE:
 438         case V4L2_CID_GAIN_BLUE:
 439
 440                 /* Disable control updates if more than one control has changed
 441                  * in the cluster.
 442                  */
 443                 for (i = 0, count = 0; i < 4; ++i) {
 444                         struct v4l2_ctrl *gain = mt9t001->gains[i];
 445
 446                         if (gain->val != gain->cur.val)
 447                                 count++;
 448                 }
 449
 450                 if (count > 1) {
 451                         ret = mt9t001_ctrl_freeze(mt9t001, true);
 452                         if (ret < 0)
 453                                 return ret;
 454                 }
 455
 456                 /* Update the gain controls. */
 457                 for (i = 0; i < 4; ++i) {
 458                         struct v4l2_ctrl *gain = mt9t001->gains[i];
 459
 460                         if (gain->val == gain->cur.val)
 461                                 continue;
 462
 463                         value = mt9t001_gain_value(&gain->val);
 464                         ret = mt9t001_write(client, gains[i], value);
 465                         if (ret < 0) {
 466                                 mt9t001_ctrl_freeze(mt9t001, false);
 467                                 return ret;
 468                         }
 469                 }
 470
 471                 /* Enable control updates. */
 472                 if (count > 1) {
 473                         ret = mt9t001_ctrl_freeze(mt9t001, false);
 474                         if (ret < 0)
 475                                 return ret;
 476                 }
 477
 478                 break;
 479
 480         case V4L2_CID_EXPOSURE:
 481                 ret = mt9t001_write(client, MT9T001_SHUTTER_WIDTH_LOW,
 482                                     ctrl->val & 0xffff);
 483                 if (ret < 0)
 484                         return ret;
 485
 486                 return mt9t001_write(client, MT9T001_SHUTTER_WIDTH_HIGH,
 487                                      ctrl->val >> 16);
 488
 489         case V4L2_CID_TEST_PATTERN:
 490                 ret = mt9t001_set_output_control(mt9t001,
 491                         ctrl->val ? 0 : MT9T001_OUTPUT_CONTROL_TEST_DATA,
 492                         ctrl->val ? MT9T001_OUTPUT_CONTROL_TEST_DATA : 0);
 493                 if (ret < 0)
 494                         return ret;
 495
 496                 return mt9t001_write(client, MT9T001_TEST_DATA, ctrl->val << 2);
 497
 498         case V4L2_CID_BLACK_LEVEL_AUTO:
 499                 value = ctrl->val ? 0 : MT9T001_BLACK_LEVEL_OVERRIDE;
 500                 ret = mt9t001_write(client, MT9T001_BLACK_LEVEL_CALIBRATION,
 501                                     value);
 502                 if (ret < 0)
 503                         return ret;
 504
 505                 mt9t001->black_level = value;
 506                 break;
 507
 508         case V4L2_CID_BLACK_LEVEL_OFFSET:
 509                 ret = mt9t001_write(client, MT9T001_GREEN1_OFFSET, ctrl->val);
 510                 if (ret < 0)
 511                         return ret;
 512
 513                 ret = mt9t001_write(client, MT9T001_GREEN2_OFFSET, ctrl->val);
 514                 if (ret < 0)
 515                         return ret;
 516
 517                 ret = mt9t001_write(client, MT9T001_RED_OFFSET, ctrl->val);
 518                 if (ret < 0)
 519                         return ret;
 520
 521                 return mt9t001_write(client, MT9T001_BLUE_OFFSET, ctrl->val);
 522
 523         case V4L2_CID_BLACK_LEVEL_CALIBRATE:
 524                 return mt9t001_write(client, MT9T001_BLACK_LEVEL_CALIBRATION,
 525                                      MT9T001_BLACK_LEVEL_RECALCULATE |
 526                                      mt9t001->black_level);
 527         }
 528
 529         return 0;
 530 }
 531
 532 static struct v4l2_ctrl_ops mt9t001_ctrl_ops = {
 533         .s_ctrl = mt9t001_s_ctrl,
 534 };
 535
 536 static const struct v4l2_ctrl_config mt9t001_ctrls[] = {
 537         {
 538                 .ops            = &mt9t001_ctrl_ops,
 539                 .id             = V4L2_CID_TEST_PATTERN,
 540                 .type           = V4L2_CTRL_TYPE_INTEGER,
 541                 .name           = "Test pattern",
 542                 .min            = 0,
 543                 .max            = 1023,
 544                 .step           = 1,
 545                 .def            = 0,
 546                 .flags          = 0,
 547         }, {
 548                 .ops            = &mt9t001_ctrl_ops,
 549                 .id             = V4L2_CID_BLACK_LEVEL_AUTO,
 550                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
 551                 .name           = "Black Level, Auto",
 552                 .min            = 0,
 553                 .max            = 1,
 554                 .step           = 1,
 555                 .def            = 1,
 556                 .flags          = 0,
 557         }, {
 558                 .ops            = &mt9t001_ctrl_ops,
 559                 .id             = V4L2_CID_BLACK_LEVEL_OFFSET,
 560                 .type           = V4L2_CTRL_TYPE_INTEGER,
 561                 .name           = "Black Level, Offset",
 562                 .min            = -256,
 563                 .max            = 255,
 564                 .step           = 1,
 565                 .def            = 32,
 566                 .flags          = 0,
 567         }, {
 568                 .ops            = &mt9t001_ctrl_ops,
 569                 .id             = V4L2_CID_BLACK_LEVEL_CALIBRATE,
 570                 .type           = V4L2_CTRL_TYPE_BUTTON,
 571                 .name           = "Black Level, Calibrate",
 572                 .min            = 0,
 573                 .max            = 0,
 574                 .step           = 0,
 575                 .def            = 0,
 576                 .flags          = V4L2_CTRL_FLAG_WRITE_ONLY,
 577         },
 578 };
 579
 580 static const struct v4l2_ctrl_config mt9t001_gains[] = {
 581         {
 582                 .ops            = &mt9t001_ctrl_ops,
 583                 .id             = V4L2_CID_GAIN_RED,
 584                 .type           = V4L2_CTRL_TYPE_INTEGER,
 585                 .name           = "Gain, Red",
 586                 .min            = MT9T001_GLOBAL_GAIN_MIN,
 587                 .max            = MT9T001_GLOBAL_GAIN_MAX,
 588                 .step           = 1,
 589                 .def            = MT9T001_GLOBAL_GAIN_MIN,
 590                 .flags          = 0,
 591         }, {
 592                 .ops            = &mt9t001_ctrl_ops,
 593                 .id             = V4L2_CID_GAIN_GREEN_RED,
 594                 .type           = V4L2_CTRL_TYPE_INTEGER,
 595                 .name           = "Gain, Green (R)",
 596                 .min            = MT9T001_GLOBAL_GAIN_MIN,
 597                 .max            = MT9T001_GLOBAL_GAIN_MAX,
 598                 .step           = 1,
 599                 .def            = MT9T001_GLOBAL_GAIN_MIN,
 600                 .flags          = 0,
 601         }, {
 602                 .ops            = &mt9t001_ctrl_ops,
 603                 .id             = V4L2_CID_GAIN_GREEN_BLUE,
 604                 .type           = V4L2_CTRL_TYPE_INTEGER,
 605                 .name           = "Gain, Green (B)",
 606                 .min            = MT9T001_GLOBAL_GAIN_MIN,
 607                 .max            = MT9T001_GLOBAL_GAIN_MAX,
 608                 .step           = 1,
 609                 .def            = MT9T001_GLOBAL_GAIN_MIN,
 610                 .flags          = 0,
 611         }, {
 612                 .ops            = &mt9t001_ctrl_ops,
 613                 .id             = V4L2_CID_GAIN_BLUE,
 614                 .type           = V4L2_CTRL_TYPE_INTEGER,
 615                 .name           = "Gain, Blue",
 616                 .min            = MT9T001_GLOBAL_GAIN_MIN,
 617                 .max            = MT9T001_GLOBAL_GAIN_MAX,
 618                 .step           = 1,
 619                 .def            = MT9T001_GLOBAL_GAIN_MIN,
 620                 .flags          = 0,
 621         },
 622 };
 623
 624 /* -----------------------------------------------------------------------------
 625  * V4L2 subdev internal operations
 626  */
 627
 628 static int mt9t001_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
 629 {
 630         struct v4l2_mbus_framefmt *format;
 631         struct v4l2_rect *crop;
 632
 633         crop = v4l2_subdev_get_try_crop(fh, 0);
 634         crop->left = MT9T001_COLUMN_START_DEF;
 635         crop->top = MT9T001_ROW_START_DEF;
 636         crop->width = MT9T001_WINDOW_WIDTH_DEF + 1;
 637         crop->height = MT9T001_WINDOW_HEIGHT_DEF + 1;
 638
 639         format = v4l2_subdev_get_try_format(fh, 0);
 640         format->code = V4L2_MBUS_FMT_SGRBG10_1X10;
 641         format->width = MT9T001_WINDOW_WIDTH_DEF + 1;
 642         format->height = MT9T001_WINDOW_HEIGHT_DEF + 1;
 643         format->field = V4L2_FIELD_NONE;
 644         format->colorspace = V4L2_COLORSPACE_SRGB;
 645
 646         return 0;
 647 }
 648
 649 static struct v4l2_subdev_video_ops mt9t001_subdev_video_ops = {
 650         .s_stream = mt9t001_s_stream,
 651 };
 652
 653 static struct v4l2_subdev_pad_ops mt9t001_subdev_pad_ops = {
 654         .enum_mbus_code = mt9t001_enum_mbus_code,
 655         .enum_frame_size = mt9t001_enum_frame_size,
 656         .get_fmt = mt9t001_get_format,
 657         .set_fmt = mt9t001_set_format,
 658         .get_crop = mt9t001_get_crop,
 659         .set_crop = mt9t001_set_crop,
 660 };
 661
 662 static struct v4l2_subdev_ops mt9t001_subdev_ops = {
 663         .video = &mt9t001_subdev_video_ops,
 664         .pad = &mt9t001_subdev_pad_ops,
 665 };
 666
 667 static struct v4l2_subdev_internal_ops mt9t001_subdev_internal_ops = {
 668         .open = mt9t001_open,
 669 };
 670
 671 static int mt9t001_video_probe(struct i2c_client *client)
 672 {
 673         struct mt9t001_platform_data *pdata = client->dev.platform_data;
 674         s32 data;
 675         int ret;
 676
 677         dev_info(&client->dev, "Probing MT9T001 at address 0x%02x\n",
 678                  client->addr);
 679
 680         /* Reset the chip and stop data read out */
 681         ret = mt9t001_write(client, MT9T001_RESET, 1);
 682         if (ret < 0)
 683                 return ret;
 684
 685         ret = mt9t001_write(client, MT9T001_RESET, 0);
 686         if (ret < 0)
 687                 return ret;
 688
 689         ret  = mt9t001_write(client, MT9T001_OUTPUT_CONTROL, 0);
 690         if (ret < 0)
 691                 return ret;
 692
 693         /* Configure the pixel clock polarity */
 694         if (pdata && pdata->clk_pol) {
 695                 ret  = mt9t001_write(client, MT9T001_PIXEL_CLOCK,
 696                                      MT9T001_PIXEL_CLOCK_INVERT);
 697                 if (ret < 0)
 698                         return ret;
 699         }
 700
 701         /* Read and check the sensor version */
 702         data = mt9t001_read(client, MT9T001_CHIP_VERSION);
 703         if (data != MT9T001_CHIP_ID) {
 704                 dev_err(&client->dev, "MT9T001 not detected, wrong version "
 705                         "0x%04x\n", data);
 706                 return -ENODEV;
 707         }
 708
 709         dev_info(&client->dev, "MT9T001 detected at address 0x%02x\n",
 710                  client->addr);
 711
 712         return ret;
 713 }
 714
 715 static int mt9t001_probe(struct i2c_client *client,
 716                          const struct i2c_device_id *did)
 717 {
 718         struct mt9t001 *mt9t001;
 719         unsigned int i;
 720         int ret;
 721
 722         if (!i2c_check_functionality(client->adapter,
 723                                      I2C_FUNC_SMBUS_WORD_DATA)) {
 724                 dev_warn(&client->adapter->dev,
 725                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
 726                 return -EIO;
 727         }
 728
 729         ret = mt9t001_video_probe(client);
 730         if (ret < 0)
 731                 return ret;
 732
 733         mt9t001 = kzalloc(sizeof(*mt9t001), GFP_KERNEL);
 734         if (!mt9t001)
 735                 return -ENOMEM;
 736
 737         v4l2_ctrl_handler_init(&mt9t001->ctrls, ARRAY_SIZE(mt9t001_ctrls) +
 738                                                 ARRAY_SIZE(mt9t001_gains) + 2);
 739
 740         v4l2_ctrl_new_std(&mt9t001->ctrls, &mt9t001_ctrl_ops,
 741                           V4L2_CID_EXPOSURE, MT9T001_SHUTTER_WIDTH_MIN,
 742                           MT9T001_SHUTTER_WIDTH_MAX, 1,
 743                           MT9T001_SHUTTER_WIDTH_DEF);
 744         v4l2_ctrl_new_std(&mt9t001->ctrls, &mt9t001_ctrl_ops,
 745                           V4L2_CID_BLACK_LEVEL, 1, 1, 1, 1);
 746
 747         for (i = 0; i < ARRAY_SIZE(mt9t001_ctrls); ++i)
 748                 v4l2_ctrl_new_custom(&mt9t001->ctrls, &mt9t001_ctrls[i], NULL);
 749
 750         for (i = 0; i < ARRAY_SIZE(mt9t001_gains); ++i)
 751                 mt9t001->gains[i] = v4l2_ctrl_new_custom(&mt9t001->ctrls,
 752                         &mt9t001_gains[i], NULL);
 753
 754         v4l2_ctrl_cluster(ARRAY_SIZE(mt9t001_gains), mt9t001->gains);
 755
 756         mt9t001->subdev.ctrl_handler = &mt9t001->ctrls;
 757
 758         if (mt9t001->ctrls.error) {
 759                 printk(KERN_INFO "%s: control initialization error %d\n",
 760                        __func__, mt9t001->ctrls.error);
 761                 ret = -EINVAL;
 762                 goto done;
 763         }
 764
 765         mt9t001->crop.left = MT9T001_COLUMN_START_DEF;
 766         mt9t001->crop.top = MT9T001_ROW_START_DEF;
 767         mt9t001->crop.width = MT9T001_WINDOW_WIDTH_DEF + 1;
 768         mt9t001->crop.height = MT9T001_WINDOW_HEIGHT_DEF + 1;
 769
 770         mt9t001->format.code = V4L2_MBUS_FMT_SGRBG10_1X10;
 771         mt9t001->format.width = MT9T001_WINDOW_WIDTH_DEF + 1;
 772         mt9t001->format.height = MT9T001_WINDOW_HEIGHT_DEF + 1;
 773         mt9t001->format.field = V4L2_FIELD_NONE;
 774         mt9t001->format.colorspace = V4L2_COLORSPACE_SRGB;
 775
 776         v4l2_i2c_subdev_init(&mt9t001->subdev, client, &mt9t001_subdev_ops);
 777         mt9t001->subdev.internal_ops = &mt9t001_subdev_internal_ops;
 778         mt9t001->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 779
 780         mt9t001->pad.flags = MEDIA_PAD_FL_SOURCE;
 781         ret = media_entity_init(&mt9t001->subdev.entity, 1, &mt9t001->pad, 0);
 782
 783 done:
 784         if (ret < 0) {
 785                 v4l2_ctrl_handler_free(&mt9t001->ctrls);
 786                 media_entity_cleanup(&mt9t001->subdev.entity);
 787                 kfree(mt9t001);
 788         }
 789
 790         return ret;
 791 }
 792
 793 static int mt9t001_remove(struct i2c_client *client)
 794 {
 795         struct v4l2_subdev *subdev = i2c_get_clientdata(client);
 796         struct mt9t001 *mt9t001 = to_mt9t001(subdev);
 797
 798         v4l2_ctrl_handler_free(&mt9t001->ctrls);
 799         v4l2_device_unregister_subdev(subdev);
 800         media_entity_cleanup(&subdev->entity);
 801         kfree(mt9t001);
 802         return 0;
 803 }
 804
 805 static const struct i2c_device_id mt9t001_id[] = {
 806         { "mt9t001", 0 },
 807         { }
 808 };
 809 MODULE_DEVICE_TABLE(i2c, mt9t001_id);
 810
 811 static struct i2c_driver mt9t001_driver = {
 812         .driver = {
 813                 .name = "mt9t001",
 814         },
 815         .probe          = mt9t001_probe,
 816         .remove         = mt9t001_remove,
 817         .id_table       = mt9t001_id,
 818 };
 819
 820 static int __init mt9t001_init(void)
 821 {
 822         return i2c_add_driver(&mt9t001_driver);
 823 }
 824
 825 static void __exit mt9t001_exit(void)
 826 {
 827         i2c_del_driver(&mt9t001_driver);
 828 }
 829
 830 module_init(mt9t001_init);
 831 module_exit(mt9t001_exit);
 832
 833 MODULE_DESCRIPTION("Aptina (Micron) MT9T001 Camera driver");
 834 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 835 MODULE_LICENSE("GPL");