drivers/media/i2c/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/clk.h>
  16 #include <linux/i2c.h>
  17 #include <linux/log2.h>
  18 #include <linux/module.h>
  19 #include <linux/regulator/consumer.h>
  20 #include <linux/slab.h>
  21 #include <linux/videodev2.h>
  22 #include <linux/v4l2-mediabus.h>
  23
  24 #include <media/mt9t001.h>
  25 #include <media/v4l2-ctrls.h>
  26 #include <media/v4l2-device.h>
  27 #include <media/v4l2-subdev.h>
  28
  29 #define MT9T001_PIXEL_ARRAY_HEIGHT                      1568
  30 #define MT9T001_PIXEL_ARRAY_WIDTH                       2112
  31
  32 #define MT9T001_CHIP_VERSION                            0x00
  33 #define         MT9T001_CHIP_ID                         0x1621
  34 #define MT9T001_ROW_START                               0x01
  35 #define         MT9T001_ROW_START_MIN                   0
  36 #define         MT9T001_ROW_START_DEF                   20
  37 #define         MT9T001_ROW_START_MAX                   1534
  38 #define MT9T001_COLUMN_START                            0x02
  39 #define         MT9T001_COLUMN_START_MIN                0
  40 #define         MT9T001_COLUMN_START_DEF                32
  41 #define         MT9T001_COLUMN_START_MAX                2046
  42 #define MT9T001_WINDOW_HEIGHT                           0x03
  43 #define         MT9T001_WINDOW_HEIGHT_MIN               1
  44 #define         MT9T001_WINDOW_HEIGHT_DEF               1535
  45 #define         MT9T001_WINDOW_HEIGHT_MAX               1567
  46 #define MT9T001_WINDOW_WIDTH                            0x04
  47 #define         MT9T001_WINDOW_WIDTH_MIN                1
  48 #define         MT9T001_WINDOW_WIDTH_DEF                2047
  49 #define         MT9T001_WINDOW_WIDTH_MAX                2111
  50 #define MT9T001_HORIZONTAL_BLANKING                     0x05
  51 #define         MT9T001_HORIZONTAL_BLANKING_MIN         21
  52 #define         MT9T001_HORIZONTAL_BLANKING_MAX         1023
  53 #define MT9T001_VERTICAL_BLANKING                       0x06
  54 #define         MT9T001_VERTICAL_BLANKING_MIN           3
  55 #define         MT9T001_VERTICAL_BLANKING_MAX           1023
  56 #define MT9T001_OUTPUT_CONTROL                          0x07
  57 #define         MT9T001_OUTPUT_CONTROL_SYNC             (1 << 0)
  58 #define         MT9T001_OUTPUT_CONTROL_CHIP_ENABLE      (1 << 1)
  59 #define         MT9T001_OUTPUT_CONTROL_TEST_DATA        (1 << 6)
  60 #define         MT9T001_OUTPUT_CONTROL_DEF              0x0002
  61 #define MT9T001_SHUTTER_WIDTH_HIGH                      0x08
  62 #define MT9T001_SHUTTER_WIDTH_LOW                       0x09
  63 #define         MT9T001_SHUTTER_WIDTH_MIN               1
  64 #define         MT9T001_SHUTTER_WIDTH_DEF               1561
  65 #define         MT9T001_SHUTTER_WIDTH_MAX               (1024 * 1024)
  66 #define MT9T001_PIXEL_CLOCK                             0x0a
  67 #define         MT9T001_PIXEL_CLOCK_INVERT              (1 << 15)
  68 #define         MT9T001_PIXEL_CLOCK_SHIFT_MASK          (7 << 8)
  69 #define         MT9T001_PIXEL_CLOCK_SHIFT_SHIFT         8
  70 #define         MT9T001_PIXEL_CLOCK_DIVIDE_MASK         (0x7f << 0)
  71 #define MT9T001_FRAME_RESTART                           0x0b
  72 #define MT9T001_SHUTTER_DELAY                           0x0c
  73 #define         MT9T001_SHUTTER_DELAY_MAX               2047
  74 #define MT9T001_RESET                                   0x0d
  75 #define MT9T001_READ_MODE1                              0x1e
  76 #define         MT9T001_READ_MODE_SNAPSHOT              (1 << 8)
  77 #define         MT9T001_READ_MODE_STROBE_ENABLE         (1 << 9)
  78 #define         MT9T001_READ_MODE_STROBE_WIDTH          (1 << 10)
  79 #define         MT9T001_READ_MODE_STROBE_OVERRIDE       (1 << 11)
  80 #define MT9T001_READ_MODE2                              0x20
  81 #define         MT9T001_READ_MODE_BAD_FRAMES            (1 << 0)
  82 #define         MT9T001_READ_MODE_LINE_VALID_CONTINUOUS (1 << 9)
  83 #define         MT9T001_READ_MODE_LINE_VALID_FRAME      (1 << 10)
  84 #define MT9T001_READ_MODE3                              0x21
  85 #define         MT9T001_READ_MODE_GLOBAL_RESET          (1 << 0)
  86 #define         MT9T001_READ_MODE_GHST_CTL              (1 << 1)
  87 #define MT9T001_ROW_ADDRESS_MODE                        0x22
  88 #define         MT9T001_ROW_SKIP_MASK                   (7 << 0)
  89 #define         MT9T001_ROW_BIN_MASK                    (3 << 3)
  90 #define         MT9T001_ROW_BIN_SHIFT                   3
  91 #define MT9T001_COLUMN_ADDRESS_MODE                     0x23
  92 #define         MT9T001_COLUMN_SKIP_MASK                (7 << 0)
  93 #define         MT9T001_COLUMN_BIN_MASK                 (3 << 3)
  94 #define         MT9T001_COLUMN_BIN_SHIFT                3
  95 #define MT9T001_GREEN1_GAIN                             0x2b
  96 #define MT9T001_BLUE_GAIN                               0x2c
  97 #define MT9T001_RED_GAIN                                0x2d
  98 #define MT9T001_GREEN2_GAIN                             0x2e
  99 #define MT9T001_TEST_DATA                               0x32
 100 #define MT9T001_GLOBAL_GAIN                             0x35
 101 #define         MT9T001_GLOBAL_GAIN_MIN                 8
 102 #define         MT9T001_GLOBAL_GAIN_MAX                 1024
 103 #define MT9T001_BLACK_LEVEL                             0x49
 104 #define MT9T001_ROW_BLACK_DEFAULT_OFFSET                0x4b
 105 #define MT9T001_BLC_DELTA_THRESHOLDS                    0x5d
 106 #define MT9T001_CAL_THRESHOLDS                          0x5f
 107 #define MT9T001_GREEN1_OFFSET                           0x60
 108 #define MT9T001_GREEN2_OFFSET                           0x61
 109 #define MT9T001_BLACK_LEVEL_CALIBRATION                 0x62
 110 #define         MT9T001_BLACK_LEVEL_OVERRIDE            (1 << 0)
 111 #define         MT9T001_BLACK_LEVEL_DISABLE_OFFSET      (1 << 1)
 112 #define         MT9T001_BLACK_LEVEL_RECALCULATE         (1 << 12)
 113 #define         MT9T001_BLACK_LEVEL_LOCK_RED_BLUE       (1 << 13)
 114 #define         MT9T001_BLACK_LEVEL_LOCK_GREEN          (1 << 14)
 115 #define MT9T001_RED_OFFSET                              0x63
 116 #define MT9T001_BLUE_OFFSET                             0x64
 117
 118 struct mt9t001 {
 119         struct v4l2_subdev subdev;
 120         struct media_pad pad;
 121
 122         struct clk *clk;
 123         struct regulator_bulk_data regulators[2];
 124
 125         struct mutex power_lock; /* lock to protect power_count */
 126         int power_count;
 127
 128         struct v4l2_mbus_framefmt format;
 129         struct v4l2_rect crop;
 130
 131         struct v4l2_ctrl_handler ctrls;
 132         struct v4l2_ctrl *gains[4];
 133
 134         u16 output_control;
 135         u16 black_level;
 136 };
 137
 138 static inline struct mt9t001 *to_mt9t001(struct v4l2_subdev *sd)
 139 {
 140         return container_of(sd, struct mt9t001, subdev);
 141 }
 142
 143 static int mt9t001_read(struct i2c_client *client, u8 reg)
 144 {
 145         return i2c_smbus_read_word_swapped(client, reg);
 146 }
 147
 148 static int mt9t001_write(struct i2c_client *client, u8 reg, u16 data)
 149 {
 150         return i2c_smbus_write_word_swapped(client, reg, data);
 151 }
 152
 153 static int mt9t001_set_output_control(struct mt9t001 *mt9t001, u16 clear,
 154                                       u16 set)
 155 {
 156         struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev);
 157         u16 value = (mt9t001->output_control & ~clear) | set;
 158         int ret;
 159
 160         if (value == mt9t001->output_control)
 161                 return 0;
 162
 163         ret = mt9t001_write(client, MT9T001_OUTPUT_CONTROL, value);
 164         if (ret < 0)
 165                 return ret;
 166
 167         mt9t001->output_control = value;
 168         return 0;
 169 }
 170
 171 static int mt9t001_reset(struct mt9t001 *mt9t001)
 172 {
 173         struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev);
 174         int ret;
 175
 176         /* Reset the chip and stop data read out */
 177         ret = mt9t001_write(client, MT9T001_RESET, 1);
 178         if (ret < 0)
 179                 return ret;
 180
 181         ret = mt9t001_write(client, MT9T001_RESET, 0);
 182         if (ret < 0)
 183                 return ret;
 184
 185         mt9t001->output_control = MT9T001_OUTPUT_CONTROL_DEF;
 186
 187         return mt9t001_set_output_control(mt9t001,
 188                                           MT9T001_OUTPUT_CONTROL_CHIP_ENABLE,
 189                                           0);
 190 }
 191
 192 static int mt9t001_power_on(struct mt9t001 *mt9t001)
 193 {
 194         int ret;
 195
 196         /* Bring up the supplies */
 197         ret = regulator_bulk_enable(ARRAY_SIZE(mt9t001->regulators),
 198                                    mt9t001->regulators);
 199         if (ret < 0)
 200                 return ret;
 201
 202         /* Enable clock */
 203         ret = clk_prepare_enable(mt9t001->clk);
 204         if (ret < 0)
 205                 regulator_bulk_disable(ARRAY_SIZE(mt9t001->regulators),
 206                                        mt9t001->regulators);
 207
 208         return ret;
 209 }
 210
 211 static void mt9t001_power_off(struct mt9t001 *mt9t001)
 212 {
 213         regulator_bulk_disable(ARRAY_SIZE(mt9t001->regulators),
 214                                mt9t001->regulators);
 215
 216         clk_disable_unprepare(mt9t001->clk);
 217 }
 218
 219 static int __mt9t001_set_power(struct mt9t001 *mt9t001, bool on)
 220 {
 221         struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev);
 222         int ret;
 223
 224         if (!on) {
 225                 mt9t001_power_off(mt9t001);
 226                 return 0;
 227         }
 228
 229         ret = mt9t001_power_on(mt9t001);
 230         if (ret < 0)
 231                 return ret;
 232
 233         ret = mt9t001_reset(mt9t001);
 234         if (ret < 0) {
 235                 dev_err(&client->dev, "Failed to reset the camera\n");
 236                 return ret;
 237         }
 238
 239         return v4l2_ctrl_handler_setup(&mt9t001->ctrls);
 240 }
 241
 242 /* -----------------------------------------------------------------------------
 243  * V4L2 subdev video operations
 244  */
 245
 246 static struct v4l2_mbus_framefmt *
 247 __mt9t001_get_pad_format(struct mt9t001 *mt9t001, struct v4l2_subdev_fh *fh,
 248                          unsigned int pad, enum v4l2_subdev_format_whence which)
 249 {
 250         switch (which) {
 251         case V4L2_SUBDEV_FORMAT_TRY:
 252                 return v4l2_subdev_get_try_format(fh, pad);
 253         case V4L2_SUBDEV_FORMAT_ACTIVE:
 254                 return &mt9t001->format;
 255         default:
 256                 return NULL;
 257         }
 258 }
 259
 260 static struct v4l2_rect *
 261 __mt9t001_get_pad_crop(struct mt9t001 *mt9t001, struct v4l2_subdev_fh *fh,
 262                        unsigned int pad, enum v4l2_subdev_format_whence which)
 263 {
 264         switch (which) {
 265         case V4L2_SUBDEV_FORMAT_TRY:
 266                 return v4l2_subdev_get_try_crop(fh, pad);
 267         case V4L2_SUBDEV_FORMAT_ACTIVE:
 268                 return &mt9t001->crop;
 269         default:
 270                 return NULL;
 271         }
 272 }
 273
 274 static int mt9t001_s_stream(struct v4l2_subdev *subdev, int enable)
 275 {
 276         const u16 mode = MT9T001_OUTPUT_CONTROL_CHIP_ENABLE;
 277         struct i2c_client *client = v4l2_get_subdevdata(subdev);
 278         struct mt9t001_platform_data *pdata = client->dev.platform_data;
 279         struct mt9t001 *mt9t001 = to_mt9t001(subdev);
 280         struct v4l2_mbus_framefmt *format = &mt9t001->format;
 281         struct v4l2_rect *crop = &mt9t001->crop;
 282         unsigned int hratio;
 283         unsigned int vratio;
 284         int ret;
 285
 286         if (!enable)
 287                 return mt9t001_set_output_control(mt9t001, mode, 0);
 288
 289         /* Configure the pixel clock polarity */
 290         if (pdata->clk_pol) {
 291                 ret  = mt9t001_write(client, MT9T001_PIXEL_CLOCK,
 292                                      MT9T001_PIXEL_CLOCK_INVERT);
 293                 if (ret < 0)
 294                         return ret;
 295         }
 296
 297         /* Configure the window size and row/column bin */
 298         hratio = DIV_ROUND_CLOSEST(crop->width, format->width);
 299         vratio = DIV_ROUND_CLOSEST(crop->height, format->height);
 300
 301         ret = mt9t001_write(client, MT9T001_ROW_ADDRESS_MODE, hratio - 1);
 302         if (ret < 0)
 303                 return ret;
 304
 305         ret = mt9t001_write(client, MT9T001_COLUMN_ADDRESS_MODE, vratio - 1);
 306         if (ret < 0)
 307                 return ret;
 308
 309         ret = mt9t001_write(client, MT9T001_COLUMN_START, crop->left);
 310         if (ret < 0)
 311                 return ret;
 312
 313         ret = mt9t001_write(client, MT9T001_ROW_START, crop->top);
 314         if (ret < 0)
 315                 return ret;
 316
 317         ret = mt9t001_write(client, MT9T001_WINDOW_WIDTH, crop->width - 1);
 318         if (ret < 0)
 319                 return ret;
 320
 321         ret = mt9t001_write(client, MT9T001_WINDOW_HEIGHT, crop->height - 1);
 322         if (ret < 0)
 323                 return ret;
 324
 325         /* Switch to master "normal" mode */
 326         return mt9t001_set_output_control(mt9t001, 0, mode);
 327 }
 328
 329 static int mt9t001_enum_mbus_code(struct v4l2_subdev *subdev,
 330                                   struct v4l2_subdev_fh *fh,
 331                                   struct v4l2_subdev_mbus_code_enum *code)
 332 {
 333         if (code->index > 0)
 334                 return -EINVAL;
 335
 336         code->code = V4L2_MBUS_FMT_SGRBG10_1X10;
 337         return 0;
 338 }
 339
 340 static int mt9t001_enum_frame_size(struct v4l2_subdev *subdev,
 341                                    struct v4l2_subdev_fh *fh,
 342                                    struct v4l2_subdev_frame_size_enum *fse)
 343 {
 344         if (fse->index >= 8 || fse->code != V4L2_MBUS_FMT_SGRBG10_1X10)
 345                 return -EINVAL;
 346
 347         fse->min_width = (MT9T001_WINDOW_WIDTH_DEF + 1) / fse->index;
 348         fse->max_width = fse->min_width;
 349         fse->min_height = (MT9T001_WINDOW_HEIGHT_DEF + 1) / fse->index;
 350         fse->max_height = fse->min_height;
 351
 352         return 0;
 353 }
 354
 355 static int mt9t001_get_format(struct v4l2_subdev *subdev,
 356                               struct v4l2_subdev_fh *fh,
 357                               struct v4l2_subdev_format *format)
 358 {
 359         struct mt9t001 *mt9t001 = to_mt9t001(subdev);
 360
 361         format->format = *__mt9t001_get_pad_format(mt9t001, fh, format->pad,
 362                                                    format->which);
 363         return 0;
 364 }
 365
 366 static int mt9t001_set_format(struct v4l2_subdev *subdev,
 367                               struct v4l2_subdev_fh *fh,
 368                               struct v4l2_subdev_format *format)
 369 {
 370         struct mt9t001 *mt9t001 = to_mt9t001(subdev);
 371         struct v4l2_mbus_framefmt *__format;
 372         struct v4l2_rect *__crop;
 373         unsigned int width;
 374         unsigned int height;
 375         unsigned int hratio;
 376         unsigned int vratio;
 377
 378         __crop = __mt9t001_get_pad_crop(mt9t001, fh, format->pad,
 379                                         format->which);
 380
 381         /* Clamp the width and height to avoid dividing by zero. */
 382         width = clamp_t(unsigned int, ALIGN(format->format.width, 2),
 383                         max_t(unsigned int, __crop->width / 8,
 384                               MT9T001_WINDOW_HEIGHT_MIN + 1),
 385                         __crop->width);
 386         height = clamp_t(unsigned int, ALIGN(format->format.height, 2),
 387                          max_t(unsigned int, __crop->height / 8,
 388                                MT9T001_WINDOW_HEIGHT_MIN + 1),
 389                          __crop->height);
 390
 391         hratio = DIV_ROUND_CLOSEST(__crop->width, width);
 392         vratio = DIV_ROUND_CLOSEST(__crop->height, height);
 393
 394         __format = __mt9t001_get_pad_format(mt9t001, fh, format->pad,
 395                                             format->which);
 396         __format->width = __crop->width / hratio;
 397         __format->height = __crop->height / vratio;
 398
 399         format->format = *__format;
 400
 401         return 0;
 402 }
 403
 404 static int mt9t001_get_crop(struct v4l2_subdev *subdev,
 405                             struct v4l2_subdev_fh *fh,
 406                             struct v4l2_subdev_crop *crop)
 407 {
 408         struct mt9t001 *mt9t001 = to_mt9t001(subdev);
 409
 410         crop->rect = *__mt9t001_get_pad_crop(mt9t001, fh, crop->pad,
 411                                              crop->which);
 412         return 0;
 413 }
 414
 415 static int mt9t001_set_crop(struct v4l2_subdev *subdev,
 416                             struct v4l2_subdev_fh *fh,
 417                             struct v4l2_subdev_crop *crop)
 418 {
 419         struct mt9t001 *mt9t001 = to_mt9t001(subdev);
 420         struct v4l2_mbus_framefmt *__format;
 421         struct v4l2_rect *__crop;
 422         struct v4l2_rect rect;
 423
 424         /* Clamp the crop rectangle boundaries and align them to a multiple of 2
 425          * pixels.
 426          */
 427         rect.left = clamp(ALIGN(crop->rect.left, 2),
 428                           MT9T001_COLUMN_START_MIN,
 429                           MT9T001_COLUMN_START_MAX);
 430         rect.top = clamp(ALIGN(crop->rect.top, 2),
 431                          MT9T001_ROW_START_MIN,
 432                          MT9T001_ROW_START_MAX);
 433         rect.width = clamp_t(unsigned int, ALIGN(crop->rect.width, 2),
 434                              MT9T001_WINDOW_WIDTH_MIN + 1,
 435                              MT9T001_WINDOW_WIDTH_MAX + 1);
 436         rect.height = clamp_t(unsigned int, ALIGN(crop->rect.height, 2),
 437                               MT9T001_WINDOW_HEIGHT_MIN + 1,
 438                               MT9T001_WINDOW_HEIGHT_MAX + 1);
 439
 440         rect.width = min_t(unsigned int, rect.width,
 441                            MT9T001_PIXEL_ARRAY_WIDTH - rect.left);
 442         rect.height = min_t(unsigned int, rect.height,
 443                             MT9T001_PIXEL_ARRAY_HEIGHT - rect.top);
 444
 445         __crop = __mt9t001_get_pad_crop(mt9t001, fh, crop->pad, crop->which);
 446
 447         if (rect.width != __crop->width || rect.height != __crop->height) {
 448                 /* Reset the output image size if the crop rectangle size has
 449                  * been modified.
 450                  */
 451                 __format = __mt9t001_get_pad_format(mt9t001, fh, crop->pad,
 452                                                     crop->which);
 453                 __format->width = rect.width;
 454                 __format->height = rect.height;
 455         }
 456
 457         *__crop = rect;
 458         crop->rect = rect;
 459
 460         return 0;
 461 }
 462
 463 /* -----------------------------------------------------------------------------
 464  * V4L2 subdev control operations
 465  */
 466
 467 #define V4L2_CID_TEST_PATTERN_COLOR     (V4L2_CID_USER_BASE | 0x1001)
 468 #define V4L2_CID_BLACK_LEVEL_AUTO       (V4L2_CID_USER_BASE | 0x1002)
 469 #define V4L2_CID_BLACK_LEVEL_OFFSET     (V4L2_CID_USER_BASE | 0x1003)
 470 #define V4L2_CID_BLACK_LEVEL_CALIBRATE  (V4L2_CID_USER_BASE | 0x1004)
 471
 472 #define V4L2_CID_GAIN_RED               (V4L2_CTRL_CLASS_CAMERA | 0x1001)
 473 #define V4L2_CID_GAIN_GREEN_RED         (V4L2_CTRL_CLASS_CAMERA | 0x1002)
 474 #define V4L2_CID_GAIN_GREEN_BLUE        (V4L2_CTRL_CLASS_CAMERA | 0x1003)
 475 #define V4L2_CID_GAIN_BLUE              (V4L2_CTRL_CLASS_CAMERA | 0x1004)
 476
 477 static u16 mt9t001_gain_value(s32 *gain)
 478 {
 479         /* Gain is controlled by 2 analog stages and a digital stage. Valid
 480          * values for the 3 stages are
 481          *
 482          * Stage                Min     Max     Step
 483          * ------------------------------------------
 484          * First analog stage   x1      x2      1
 485          * Second analog stage  x1      x4      0.125
 486          * Digital stage        x1      x16     0.125
 487          *
 488          * To minimize noise, the gain stages should be used in the second
 489          * analog stage, first analog stage, digital stage order. Gain from a
 490          * previous stage should be pushed to its maximum value before the next
 491          * stage is used.
 492          */
 493         if (*gain <= 32)
 494                 return *gain;
 495
 496         if (*gain <= 64) {
 497                 *gain &= ~1;
 498                 return (1 << 6) | (*gain >> 1);
 499         }
 500
 501         *gain &= ~7;
 502         return ((*gain - 64) << 5) | (1 << 6) | 32;
 503 }
 504
 505 static int mt9t001_ctrl_freeze(struct mt9t001 *mt9t001, bool freeze)
 506 {
 507         return mt9t001_set_output_control(mt9t001,
 508                 freeze ? 0 : MT9T001_OUTPUT_CONTROL_SYNC,
 509                 freeze ? MT9T001_OUTPUT_CONTROL_SYNC : 0);
 510 }
 511
 512 static int mt9t001_s_ctrl(struct v4l2_ctrl *ctrl)
 513 {
 514         static const u8 gains[4] = {
 515                 MT9T001_RED_GAIN, MT9T001_GREEN1_GAIN,
 516                 MT9T001_GREEN2_GAIN, MT9T001_BLUE_GAIN
 517         };
 518
 519         struct mt9t001 *mt9t001 =
 520                         container_of(ctrl->handler, struct mt9t001, ctrls);
 521         struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev);
 522         unsigned int count;
 523         unsigned int i;
 524         u16 value;
 525         int ret;
 526
 527         switch (ctrl->id) {
 528         case V4L2_CID_GAIN_RED:
 529         case V4L2_CID_GAIN_GREEN_RED:
 530         case V4L2_CID_GAIN_GREEN_BLUE:
 531         case V4L2_CID_GAIN_BLUE:
 532
 533                 /* Disable control updates if more than one control has changed
 534                  * in the cluster.
 535                  */
 536                 for (i = 0, count = 0; i < 4; ++i) {
 537                         struct v4l2_ctrl *gain = mt9t001->gains[i];
 538
 539                         if (gain->val != gain->cur.val)
 540                                 count++;
 541                 }
 542
 543                 if (count > 1) {
 544                         ret = mt9t001_ctrl_freeze(mt9t001, true);
 545                         if (ret < 0)
 546                                 return ret;
 547                 }
 548
 549                 /* Update the gain controls. */
 550                 for (i = 0; i < 4; ++i) {
 551                         struct v4l2_ctrl *gain = mt9t001->gains[i];
 552
 553                         if (gain->val == gain->cur.val)
 554                                 continue;
 555
 556                         value = mt9t001_gain_value(&gain->val);
 557                         ret = mt9t001_write(client, gains[i], value);
 558                         if (ret < 0) {
 559                                 mt9t001_ctrl_freeze(mt9t001, false);
 560                                 return ret;
 561                         }
 562                 }
 563
 564                 /* Enable control updates. */
 565                 if (count > 1) {
 566                         ret = mt9t001_ctrl_freeze(mt9t001, false);
 567                         if (ret < 0)
 568                                 return ret;
 569                 }
 570
 571                 break;
 572
 573         case V4L2_CID_EXPOSURE:
 574                 ret = mt9t001_write(client, MT9T001_SHUTTER_WIDTH_LOW,
 575                                     ctrl->val & 0xffff);
 576                 if (ret < 0)
 577                         return ret;
 578
 579                 return mt9t001_write(client, MT9T001_SHUTTER_WIDTH_HIGH,
 580                                      ctrl->val >> 16);
 581
 582         case V4L2_CID_TEST_PATTERN:
 583                 return mt9t001_set_output_control(mt9t001,
 584                         ctrl->val ? 0 : MT9T001_OUTPUT_CONTROL_TEST_DATA,
 585                         ctrl->val ? MT9T001_OUTPUT_CONTROL_TEST_DATA : 0);
 586
 587         case V4L2_CID_TEST_PATTERN_COLOR:
 588                 return mt9t001_write(client, MT9T001_TEST_DATA, ctrl->val << 2);
 589
 590         case V4L2_CID_BLACK_LEVEL_AUTO:
 591                 value = ctrl->val ? 0 : MT9T001_BLACK_LEVEL_OVERRIDE;
 592                 ret = mt9t001_write(client, MT9T001_BLACK_LEVEL_CALIBRATION,
 593                                     value);
 594                 if (ret < 0)
 595                         return ret;
 596
 597                 mt9t001->black_level = value;
 598                 break;
 599
 600         case V4L2_CID_BLACK_LEVEL_OFFSET:
 601                 ret = mt9t001_write(client, MT9T001_GREEN1_OFFSET, ctrl->val);
 602                 if (ret < 0)
 603                         return ret;
 604
 605                 ret = mt9t001_write(client, MT9T001_GREEN2_OFFSET, ctrl->val);
 606                 if (ret < 0)
 607                         return ret;
 608
 609                 ret = mt9t001_write(client, MT9T001_RED_OFFSET, ctrl->val);
 610                 if (ret < 0)
 611                         return ret;
 612
 613                 return mt9t001_write(client, MT9T001_BLUE_OFFSET, ctrl->val);
 614
 615         case V4L2_CID_BLACK_LEVEL_CALIBRATE:
 616                 return mt9t001_write(client, MT9T001_BLACK_LEVEL_CALIBRATION,
 617                                      MT9T001_BLACK_LEVEL_RECALCULATE |
 618                                      mt9t001->black_level);
 619         }
 620
 621         return 0;
 622 }
 623
 624 static struct v4l2_ctrl_ops mt9t001_ctrl_ops = {
 625         .s_ctrl = mt9t001_s_ctrl,
 626 };
 627
 628 static const char * const mt9t001_test_pattern_menu[] = {
 629         "Disabled",
 630         "Enabled",
 631 };
 632
 633 static const struct v4l2_ctrl_config mt9t001_ctrls[] = {
 634         {
 635                 .ops            = &mt9t001_ctrl_ops,
 636                 .id             = V4L2_CID_TEST_PATTERN_COLOR,
 637                 .type           = V4L2_CTRL_TYPE_INTEGER,
 638                 .name           = "Test Pattern Color",
 639                 .min            = 0,
 640                 .max            = 1023,
 641                 .step           = 1,
 642                 .def            = 0,
 643                 .flags          = 0,
 644         }, {
 645                 .ops            = &mt9t001_ctrl_ops,
 646                 .id             = V4L2_CID_BLACK_LEVEL_AUTO,
 647                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
 648                 .name           = "Black Level, Auto",
 649                 .min            = 0,
 650                 .max            = 1,
 651                 .step           = 1,
 652                 .def            = 1,
 653                 .flags          = 0,
 654         }, {
 655                 .ops            = &mt9t001_ctrl_ops,
 656                 .id             = V4L2_CID_BLACK_LEVEL_OFFSET,
 657                 .type           = V4L2_CTRL_TYPE_INTEGER,
 658                 .name           = "Black Level, Offset",
 659                 .min            = -256,
 660                 .max            = 255,
 661                 .step           = 1,
 662                 .def            = 32,
 663                 .flags          = 0,
 664         }, {
 665                 .ops            = &mt9t001_ctrl_ops,
 666                 .id             = V4L2_CID_BLACK_LEVEL_CALIBRATE,
 667                 .type           = V4L2_CTRL_TYPE_BUTTON,
 668                 .name           = "Black Level, Calibrate",
 669                 .min            = 0,
 670                 .max            = 0,
 671                 .step           = 0,
 672                 .def            = 0,
 673                 .flags          = V4L2_CTRL_FLAG_WRITE_ONLY,
 674         },
 675 };
 676
 677 static const struct v4l2_ctrl_config mt9t001_gains[] = {
 678         {
 679                 .ops            = &mt9t001_ctrl_ops,
 680                 .id             = V4L2_CID_GAIN_RED,
 681                 .type           = V4L2_CTRL_TYPE_INTEGER,
 682                 .name           = "Gain, Red",
 683                 .min            = MT9T001_GLOBAL_GAIN_MIN,
 684                 .max            = MT9T001_GLOBAL_GAIN_MAX,
 685                 .step           = 1,
 686                 .def            = MT9T001_GLOBAL_GAIN_MIN,
 687                 .flags          = 0,
 688         }, {
 689                 .ops            = &mt9t001_ctrl_ops,
 690                 .id             = V4L2_CID_GAIN_GREEN_RED,
 691                 .type           = V4L2_CTRL_TYPE_INTEGER,
 692                 .name           = "Gain, Green (R)",
 693                 .min            = MT9T001_GLOBAL_GAIN_MIN,
 694                 .max            = MT9T001_GLOBAL_GAIN_MAX,
 695                 .step           = 1,
 696                 .def            = MT9T001_GLOBAL_GAIN_MIN,
 697                 .flags          = 0,
 698         }, {
 699                 .ops            = &mt9t001_ctrl_ops,
 700                 .id             = V4L2_CID_GAIN_GREEN_BLUE,
 701                 .type           = V4L2_CTRL_TYPE_INTEGER,
 702                 .name           = "Gain, Green (B)",
 703                 .min            = MT9T001_GLOBAL_GAIN_MIN,
 704                 .max            = MT9T001_GLOBAL_GAIN_MAX,
 705                 .step           = 1,
 706                 .def            = MT9T001_GLOBAL_GAIN_MIN,
 707                 .flags          = 0,
 708         }, {
 709                 .ops            = &mt9t001_ctrl_ops,
 710                 .id             = V4L2_CID_GAIN_BLUE,
 711                 .type           = V4L2_CTRL_TYPE_INTEGER,
 712                 .name           = "Gain, Blue",
 713                 .min            = MT9T001_GLOBAL_GAIN_MIN,
 714                 .max            = MT9T001_GLOBAL_GAIN_MAX,
 715                 .step           = 1,
 716                 .def            = MT9T001_GLOBAL_GAIN_MIN,
 717                 .flags          = 0,
 718         },
 719 };
 720
 721 /* -----------------------------------------------------------------------------
 722  * V4L2 subdev core operations
 723  */
 724
 725 static int mt9t001_set_power(struct v4l2_subdev *subdev, int on)
 726 {
 727         struct mt9t001 *mt9t001 = to_mt9t001(subdev);
 728         int ret = 0;
 729
 730         mutex_lock(&mt9t001->power_lock);
 731
 732         /* If the power count is modified from 0 to != 0 or from != 0 to 0,
 733          * update the power state.
 734          */
 735         if (mt9t001->power_count == !on) {
 736                 ret = __mt9t001_set_power(mt9t001, !!on);
 737                 if (ret < 0)
 738                         goto out;
 739         }
 740
 741         /* Update the power count. */
 742         mt9t001->power_count += on ? 1 : -1;
 743         WARN_ON(mt9t001->power_count < 0);
 744
 745 out:
 746         mutex_unlock(&mt9t001->power_lock);
 747         return ret;
 748 }
 749
 750 /* -----------------------------------------------------------------------------
 751  * V4L2 subdev internal operations
 752  */
 753
 754 static int mt9t001_registered(struct v4l2_subdev *subdev)
 755 {
 756         struct i2c_client *client = v4l2_get_subdevdata(subdev);
 757         struct mt9t001 *mt9t001 = to_mt9t001(subdev);
 758         s32 data;
 759         int ret;
 760
 761         ret = mt9t001_power_on(mt9t001);
 762         if (ret < 0) {
 763                 dev_err(&client->dev, "MT9T001 power up failed\n");
 764                 return ret;
 765         }
 766
 767         /* Read out the chip version register */
 768         data = mt9t001_read(client, MT9T001_CHIP_VERSION);
 769         mt9t001_power_off(mt9t001);
 770
 771         if (data != MT9T001_CHIP_ID) {
 772                 dev_err(&client->dev,
 773                         "MT9T001 not detected, wrong version 0x%04x\n", data);
 774                 return -ENODEV;
 775         }
 776
 777         dev_info(&client->dev, "MT9T001 detected at address 0x%02x\n",
 778                  client->addr);
 779
 780         return 0;
 781 }
 782
 783 static int mt9t001_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
 784 {
 785         struct v4l2_mbus_framefmt *format;
 786         struct v4l2_rect *crop;
 787
 788         crop = v4l2_subdev_get_try_crop(fh, 0);
 789         crop->left = MT9T001_COLUMN_START_DEF;
 790         crop->top = MT9T001_ROW_START_DEF;
 791         crop->width = MT9T001_WINDOW_WIDTH_DEF + 1;
 792         crop->height = MT9T001_WINDOW_HEIGHT_DEF + 1;
 793
 794         format = v4l2_subdev_get_try_format(fh, 0);
 795         format->code = V4L2_MBUS_FMT_SGRBG10_1X10;
 796         format->width = MT9T001_WINDOW_WIDTH_DEF + 1;
 797         format->height = MT9T001_WINDOW_HEIGHT_DEF + 1;
 798         format->field = V4L2_FIELD_NONE;
 799         format->colorspace = V4L2_COLORSPACE_SRGB;
 800
 801         return mt9t001_set_power(subdev, 1);
 802 }
 803
 804 static int mt9t001_close(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
 805 {
 806         return mt9t001_set_power(subdev, 0);
 807 }
 808
 809 static struct v4l2_subdev_core_ops mt9t001_subdev_core_ops = {
 810         .s_power = mt9t001_set_power,
 811 };
 812
 813 static struct v4l2_subdev_video_ops mt9t001_subdev_video_ops = {
 814         .s_stream = mt9t001_s_stream,
 815 };
 816
 817 static struct v4l2_subdev_pad_ops mt9t001_subdev_pad_ops = {
 818         .enum_mbus_code = mt9t001_enum_mbus_code,
 819         .enum_frame_size = mt9t001_enum_frame_size,
 820         .get_fmt = mt9t001_get_format,
 821         .set_fmt = mt9t001_set_format,
 822         .get_crop = mt9t001_get_crop,
 823         .set_crop = mt9t001_set_crop,
 824 };
 825
 826 static struct v4l2_subdev_ops mt9t001_subdev_ops = {
 827         .core = &mt9t001_subdev_core_ops,
 828         .video = &mt9t001_subdev_video_ops,
 829         .pad = &mt9t001_subdev_pad_ops,
 830 };
 831
 832 static struct v4l2_subdev_internal_ops mt9t001_subdev_internal_ops = {
 833         .registered = mt9t001_registered,
 834         .open = mt9t001_open,
 835         .close = mt9t001_close,
 836 };
 837
 838 static int mt9t001_probe(struct i2c_client *client,
 839                          const struct i2c_device_id *did)
 840 {
 841         struct mt9t001_platform_data *pdata = client->dev.platform_data;
 842         struct mt9t001 *mt9t001;
 843         unsigned int i;
 844         int ret;
 845
 846         if (pdata == NULL) {
 847                 dev_err(&client->dev, "No platform data\n");
 848                 return -EINVAL;
 849         }
 850
 851         if (!i2c_check_functionality(client->adapter,
 852                                      I2C_FUNC_SMBUS_WORD_DATA)) {
 853                 dev_warn(&client->adapter->dev,
 854                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
 855                 return -EIO;
 856         }
 857
 858         mt9t001 = devm_kzalloc(&client->dev, sizeof(*mt9t001), GFP_KERNEL);
 859         if (!mt9t001)
 860                 return -ENOMEM;
 861
 862         mutex_init(&mt9t001->power_lock);
 863         mt9t001->output_control = MT9T001_OUTPUT_CONTROL_DEF;
 864
 865         mt9t001->regulators[0].supply = "vdd";
 866         mt9t001->regulators[1].supply = "vaa";
 867
 868         ret = devm_regulator_bulk_get(&client->dev, 2, mt9t001->regulators);
 869         if (ret < 0) {
 870                 dev_err(&client->dev, "Unable to get regulators\n");
 871                 return ret;
 872         }
 873
 874         mt9t001->clk = devm_clk_get(&client->dev, NULL);
 875         if (IS_ERR(mt9t001->clk)) {
 876                 dev_err(&client->dev, "Unable to get clock\n");
 877                 return PTR_ERR(mt9t001->clk);
 878         }
 879
 880         v4l2_ctrl_handler_init(&mt9t001->ctrls, ARRAY_SIZE(mt9t001_ctrls) +
 881                                                 ARRAY_SIZE(mt9t001_gains) + 4);
 882
 883         v4l2_ctrl_new_std(&mt9t001->ctrls, &mt9t001_ctrl_ops,
 884                           V4L2_CID_EXPOSURE, MT9T001_SHUTTER_WIDTH_MIN,
 885                           MT9T001_SHUTTER_WIDTH_MAX, 1,
 886                           MT9T001_SHUTTER_WIDTH_DEF);
 887         v4l2_ctrl_new_std(&mt9t001->ctrls, &mt9t001_ctrl_ops,
 888                           V4L2_CID_BLACK_LEVEL, 1, 1, 1, 1);
 889         v4l2_ctrl_new_std(&mt9t001->ctrls, &mt9t001_ctrl_ops,
 890                           V4L2_CID_PIXEL_RATE, pdata->ext_clk, pdata->ext_clk,
 891                           1, pdata->ext_clk);
 892         v4l2_ctrl_new_std_menu_items(&mt9t001->ctrls, &mt9t001_ctrl_ops,
 893                         V4L2_CID_TEST_PATTERN,
 894                         ARRAY_SIZE(mt9t001_test_pattern_menu) - 1, 0,
 895                         0, mt9t001_test_pattern_menu);
 896
 897         for (i = 0; i < ARRAY_SIZE(mt9t001_ctrls); ++i)
 898                 v4l2_ctrl_new_custom(&mt9t001->ctrls, &mt9t001_ctrls[i], NULL);
 899
 900         for (i = 0; i < ARRAY_SIZE(mt9t001_gains); ++i)
 901                 mt9t001->gains[i] = v4l2_ctrl_new_custom(&mt9t001->ctrls,
 902                         &mt9t001_gains[i], NULL);
 903
 904         v4l2_ctrl_cluster(ARRAY_SIZE(mt9t001_gains), mt9t001->gains);
 905
 906         mt9t001->subdev.ctrl_handler = &mt9t001->ctrls;
 907
 908         if (mt9t001->ctrls.error) {
 909                 printk(KERN_INFO "%s: control initialization error %d\n",
 910                        __func__, mt9t001->ctrls.error);
 911                 ret = -EINVAL;
 912                 goto done;
 913         }
 914
 915         mt9t001->crop.left = MT9T001_COLUMN_START_DEF;
 916         mt9t001->crop.top = MT9T001_ROW_START_DEF;
 917         mt9t001->crop.width = MT9T001_WINDOW_WIDTH_DEF + 1;
 918         mt9t001->crop.height = MT9T001_WINDOW_HEIGHT_DEF + 1;
 919
 920         mt9t001->format.code = V4L2_MBUS_FMT_SGRBG10_1X10;
 921         mt9t001->format.width = MT9T001_WINDOW_WIDTH_DEF + 1;
 922         mt9t001->format.height = MT9T001_WINDOW_HEIGHT_DEF + 1;
 923         mt9t001->format.field = V4L2_FIELD_NONE;
 924         mt9t001->format.colorspace = V4L2_COLORSPACE_SRGB;
 925
 926         v4l2_i2c_subdev_init(&mt9t001->subdev, client, &mt9t001_subdev_ops);
 927         mt9t001->subdev.internal_ops = &mt9t001_subdev_internal_ops;
 928         mt9t001->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 929
 930         mt9t001->pad.flags = MEDIA_PAD_FL_SOURCE;
 931         ret = media_entity_init(&mt9t001->subdev.entity, 1, &mt9t001->pad, 0);
 932
 933 done:
 934         if (ret < 0) {
 935                 v4l2_ctrl_handler_free(&mt9t001->ctrls);
 936                 media_entity_cleanup(&mt9t001->subdev.entity);
 937         }
 938
 939         return ret;
 940 }
 941
 942 static int mt9t001_remove(struct i2c_client *client)
 943 {
 944         struct v4l2_subdev *subdev = i2c_get_clientdata(client);
 945         struct mt9t001 *mt9t001 = to_mt9t001(subdev);
 946
 947         v4l2_ctrl_handler_free(&mt9t001->ctrls);
 948         v4l2_device_unregister_subdev(subdev);
 949         media_entity_cleanup(&subdev->entity);
 950         return 0;
 951 }
 952
 953 static const struct i2c_device_id mt9t001_id[] = {
 954         { "mt9t001", 0 },
 955         { }
 956 };
 957 MODULE_DEVICE_TABLE(i2c, mt9t001_id);
 958
 959 static struct i2c_driver mt9t001_driver = {
 960         .driver = {
 961                 .name = "mt9t001",
 962         },
 963         .probe          = mt9t001_probe,
 964         .remove         = mt9t001_remove,
 965         .id_table       = mt9t001_id,
 966 };
 967
 968 module_i2c_driver(mt9t001_driver);
 969
 970 MODULE_DESCRIPTION("Aptina (Micron) MT9T001 Camera driver");
 971 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 972 MODULE_LICENSE("GPL");