drivers/media/i2c/mt9m032.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Driver for MT9M032 CMOS Image Sensor from Micron
   4  *
   5  * Copyright (C) 2010-2011 Lund Engineering
   6  * Contact: Gil Lund <gwlund@lundeng.com>
   7  * Author: Martin Hostettler <martin@neutronstar.dyndns.org>
   8  */
   9
  10 #include <linux/delay.h>
  11 #include <linux/i2c.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/math64.h>
  15 #include <linux/module.h>
  16 #include <linux/mutex.h>
  17 #include <linux/slab.h>
  18 #include <linux/v4l2-mediabus.h>
  19
  20 #include <media/media-entity.h>
  21 #include <media/i2c/mt9m032.h>
  22 #include <media/v4l2-ctrls.h>
  23 #include <media/v4l2-device.h>
  24 #include <media/v4l2-subdev.h>
  25
  26 #include "aptina-pll.h"
  27
  28 /*
  29  * width and height include active boundary and black parts
  30  *
  31  * column    0-  15 active boundary
  32  * column   16-1455 image
  33  * column 1456-1471 active boundary
  34  * column 1472-1599 black
  35  *
  36  * row       0-  51 black
  37  * row      53-  59 active boundary
  38  * row      60-1139 image
  39  * row    1140-1147 active boundary
  40  * row    1148-1151 black
  41  */
  42
  43 #define MT9M032_PIXEL_ARRAY_WIDTH                       1600
  44 #define MT9M032_PIXEL_ARRAY_HEIGHT                      1152
  45
  46 #define MT9M032_CHIP_VERSION                            0x00
  47 #define         MT9M032_CHIP_VERSION_VALUE              0x1402
  48 #define MT9M032_ROW_START                               0x01
  49 #define         MT9M032_ROW_START_MIN                   0
  50 #define         MT9M032_ROW_START_MAX                   1152
  51 #define         MT9M032_ROW_START_DEF                   60
  52 #define MT9M032_COLUMN_START                            0x02
  53 #define         MT9M032_COLUMN_START_MIN                0
  54 #define         MT9M032_COLUMN_START_MAX                1600
  55 #define         MT9M032_COLUMN_START_DEF                16
  56 #define MT9M032_ROW_SIZE                                0x03
  57 #define         MT9M032_ROW_SIZE_MIN                    32
  58 #define         MT9M032_ROW_SIZE_MAX                    1152
  59 #define         MT9M032_ROW_SIZE_DEF                    1080
  60 #define MT9M032_COLUMN_SIZE                             0x04
  61 #define         MT9M032_COLUMN_SIZE_MIN                 32
  62 #define         MT9M032_COLUMN_SIZE_MAX                 1600
  63 #define         MT9M032_COLUMN_SIZE_DEF                 1440
  64 #define MT9M032_HBLANK                                  0x05
  65 #define MT9M032_VBLANK                                  0x06
  66 #define         MT9M032_VBLANK_MAX                      0x7ff
  67 #define MT9M032_SHUTTER_WIDTH_HIGH                      0x08
  68 #define MT9M032_SHUTTER_WIDTH_LOW                       0x09
  69 #define         MT9M032_SHUTTER_WIDTH_MIN               1
  70 #define         MT9M032_SHUTTER_WIDTH_MAX               1048575
  71 #define         MT9M032_SHUTTER_WIDTH_DEF               1943
  72 #define MT9M032_PIX_CLK_CTRL                            0x0a
  73 #define         MT9M032_PIX_CLK_CTRL_INV_PIXCLK         0x8000
  74 #define MT9M032_RESTART                                 0x0b
  75 #define MT9M032_RESET                                   0x0d
  76 #define MT9M032_PLL_CONFIG1                             0x11
  77 #define         MT9M032_PLL_CONFIG1_PREDIV_MASK         0x3f
  78 #define         MT9M032_PLL_CONFIG1_MUL_SHIFT           8
  79 #define MT9M032_READ_MODE1                              0x1e
  80 #define         MT9M032_READ_MODE1_OUTPUT_BAD_FRAMES    (1 << 13)
  81 #define         MT9M032_READ_MODE1_MAINTAIN_FRAME_RATE  (1 << 12)
  82 #define         MT9M032_READ_MODE1_XOR_LINE_VALID       (1 << 11)
  83 #define         MT9M032_READ_MODE1_CONT_LINE_VALID      (1 << 10)
  84 #define         MT9M032_READ_MODE1_INVERT_TRIGGER       (1 << 9)
  85 #define         MT9M032_READ_MODE1_SNAPSHOT             (1 << 8)
  86 #define         MT9M032_READ_MODE1_GLOBAL_RESET         (1 << 7)
  87 #define         MT9M032_READ_MODE1_BULB_EXPOSURE        (1 << 6)
  88 #define         MT9M032_READ_MODE1_INVERT_STROBE        (1 << 5)
  89 #define         MT9M032_READ_MODE1_STROBE_ENABLE        (1 << 4)
  90 #define         MT9M032_READ_MODE1_STROBE_START_TRIG1   (0 << 2)
  91 #define         MT9M032_READ_MODE1_STROBE_START_EXP     (1 << 2)
  92 #define         MT9M032_READ_MODE1_STROBE_START_SHUTTER (2 << 2)
  93 #define         MT9M032_READ_MODE1_STROBE_START_TRIG2   (3 << 2)
  94 #define         MT9M032_READ_MODE1_STROBE_END_TRIG1     (0 << 0)
  95 #define         MT9M032_READ_MODE1_STROBE_END_EXP       (1 << 0)
  96 #define         MT9M032_READ_MODE1_STROBE_END_SHUTTER   (2 << 0)
  97 #define         MT9M032_READ_MODE1_STROBE_END_TRIG2     (3 << 0)
  98 #define MT9M032_READ_MODE2                              0x20
  99 #define         MT9M032_READ_MODE2_VFLIP_SHIFT          15
 100 #define         MT9M032_READ_MODE2_HFLIP_SHIFT          14
 101 #define         MT9M032_READ_MODE2_ROW_BLC              0x40
 102 #define MT9M032_GAIN_GREEN1                             0x2b
 103 #define MT9M032_GAIN_BLUE                               0x2c
 104 #define MT9M032_GAIN_RED                                0x2d
 105 #define MT9M032_GAIN_GREEN2                             0x2e
 106
 107 /* write only */
 108 #define MT9M032_GAIN_ALL                                0x35
 109 #define         MT9M032_GAIN_DIGITAL_MASK               0x7f
 110 #define         MT9M032_GAIN_DIGITAL_SHIFT              8
 111 #define         MT9M032_GAIN_AMUL_SHIFT                 6
 112 #define         MT9M032_GAIN_ANALOG_MASK                0x3f
 113 #define MT9M032_FORMATTER1                              0x9e
 114 #define         MT9M032_FORMATTER1_PLL_P1_6             (1 << 8)
 115 #define         MT9M032_FORMATTER1_PARALLEL             (1 << 12)
 116 #define MT9M032_FORMATTER2                              0x9f
 117 #define         MT9M032_FORMATTER2_DOUT_EN              0x1000
 118 #define         MT9M032_FORMATTER2_PIXCLK_EN            0x2000
 119
 120 /*
 121  * The available MT9M032 datasheet is missing documentation for register 0x10
 122  * MT9P031 seems to be close enough, so use constants from that datasheet for
 123  * now.
 124  * But keep the name MT9P031 to remind us, that this isn't really confirmed
 125  * for this sensor.
 126  */
 127 #define MT9P031_PLL_CONTROL                             0x10
 128 #define         MT9P031_PLL_CONTROL_PWROFF              0x0050
 129 #define         MT9P031_PLL_CONTROL_PWRON               0x0051
 130 #define         MT9P031_PLL_CONTROL_USEPLL              0x0052
 131
 132 struct mt9m032 {
 133         struct v4l2_subdev subdev;
 134         struct media_pad pad;
 135         struct mt9m032_platform_data *pdata;
 136
 137         unsigned int pix_clock;
 138
 139         struct v4l2_ctrl_handler ctrls;
 140         struct {
 141                 struct v4l2_ctrl *hflip;
 142                 struct v4l2_ctrl *vflip;
 143         };
 144
 145         struct mutex lock; /* Protects streaming, format, interval and crop */
 146
 147         bool streaming;
 148
 149         struct v4l2_mbus_framefmt format;
 150         struct v4l2_rect crop;
 151         struct v4l2_fract frame_interval;
 152 };
 153
 154 #define to_mt9m032(sd)  container_of(sd, struct mt9m032, subdev)
 155 #define to_dev(sensor) \
 156         (&((struct i2c_client *)v4l2_get_subdevdata(&(sensor)->subdev))->dev)
 157
 158 static int mt9m032_read(struct i2c_client *client, u8 reg)
 159 {
 160         return i2c_smbus_read_word_swapped(client, reg);
 161 }
 162
 163 static int mt9m032_write(struct i2c_client *client, u8 reg, const u16 data)
 164 {
 165         return i2c_smbus_write_word_swapped(client, reg, data);
 166 }
 167
 168 static u32 mt9m032_row_time(struct mt9m032 *sensor, unsigned int width)
 169 {
 170         unsigned int effective_width;
 171         u32 ns;
 172
 173         effective_width = width + 716; /* empirical value */
 174         ns = div_u64(1000000000ULL * effective_width, sensor->pix_clock);
 175         dev_dbg(to_dev(sensor), "MT9M032 line time: %u ns\n", ns);
 176         return ns;
 177 }
 178
 179 static int mt9m032_update_timing(struct mt9m032 *sensor,
 180                                  struct v4l2_fract *interval)
 181 {
 182         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 183         struct v4l2_rect *crop = &sensor->crop;
 184         unsigned int min_vblank;
 185         unsigned int vblank;
 186         u32 row_time;
 187
 188         if (!interval)
 189                 interval = &sensor->frame_interval;
 190
 191         row_time = mt9m032_row_time(sensor, crop->width);
 192
 193         vblank = div_u64(1000000000ULL * interval->numerator,
 194                          (u64)row_time * interval->denominator)
 195                - crop->height;
 196
 197         if (vblank > MT9M032_VBLANK_MAX) {
 198                 /* hardware limits to 11 bit values */
 199                 interval->denominator = 1000;
 200                 interval->numerator =
 201                         div_u64((crop->height + MT9M032_VBLANK_MAX) *
 202                                 (u64)row_time * interval->denominator,
 203                                 1000000000ULL);
 204                 vblank = div_u64(1000000000ULL * interval->numerator,
 205                                  (u64)row_time * interval->denominator)
 206                        - crop->height;
 207         }
 208         /* enforce minimal 1.6ms blanking time. */
 209         min_vblank = 1600000 / row_time;
 210         vblank = clamp_t(unsigned int, vblank, min_vblank, MT9M032_VBLANK_MAX);
 211
 212         return mt9m032_write(client, MT9M032_VBLANK, vblank);
 213 }
 214
 215 static int mt9m032_update_geom_timing(struct mt9m032 *sensor)
 216 {
 217         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 218         int ret;
 219
 220         ret = mt9m032_write(client, MT9M032_COLUMN_SIZE,
 221                             sensor->crop.width - 1);
 222         if (!ret)
 223                 ret = mt9m032_write(client, MT9M032_ROW_SIZE,
 224                                     sensor->crop.height - 1);
 225         if (!ret)
 226                 ret = mt9m032_write(client, MT9M032_COLUMN_START,
 227                                     sensor->crop.left);
 228         if (!ret)
 229                 ret = mt9m032_write(client, MT9M032_ROW_START,
 230                                     sensor->crop.top);
 231         if (!ret)
 232                 ret = mt9m032_update_timing(sensor, NULL);
 233         return ret;
 234 }
 235
 236 static int update_formatter2(struct mt9m032 *sensor, bool streaming)
 237 {
 238         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 239         u16 reg_val =   MT9M032_FORMATTER2_DOUT_EN
 240                       | 0x0070;  /* parts reserved! */
 241                                  /* possibly for changing to 14-bit mode */
 242
 243         if (streaming)
 244                 reg_val |= MT9M032_FORMATTER2_PIXCLK_EN;   /* pixclock enable */
 245
 246         return mt9m032_write(client, MT9M032_FORMATTER2, reg_val);
 247 }
 248
 249 static int mt9m032_setup_pll(struct mt9m032 *sensor)
 250 {
 251         static const struct aptina_pll_limits limits = {
 252                 .ext_clock_min = 8000000,
 253                 .ext_clock_max = 16500000,
 254                 .int_clock_min = 2000000,
 255                 .int_clock_max = 24000000,
 256                 .out_clock_min = 322000000,
 257                 .out_clock_max = 693000000,
 258                 .pix_clock_max = 99000000,
 259                 .n_min = 1,
 260                 .n_max = 64,
 261                 .m_min = 16,
 262                 .m_max = 255,
 263                 .p1_min = 6,
 264                 .p1_max = 7,
 265         };
 266
 267         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 268         struct mt9m032_platform_data *pdata = sensor->pdata;
 269         struct aptina_pll pll;
 270         u16 reg_val;
 271         int ret;
 272
 273         pll.ext_clock = pdata->ext_clock;
 274         pll.pix_clock = pdata->pix_clock;
 275
 276         ret = aptina_pll_calculate(&client->dev, &limits, &pll);
 277         if (ret < 0)
 278                 return ret;
 279
 280         sensor->pix_clock = pdata->pix_clock;
 281
 282         ret = mt9m032_write(client, MT9M032_PLL_CONFIG1,
 283                             (pll.m << MT9M032_PLL_CONFIG1_MUL_SHIFT) |
 284                             ((pll.n - 1) & MT9M032_PLL_CONFIG1_PREDIV_MASK));
 285         if (!ret)
 286                 ret = mt9m032_write(client, MT9P031_PLL_CONTROL,
 287                                     MT9P031_PLL_CONTROL_PWRON |
 288                                     MT9P031_PLL_CONTROL_USEPLL);
 289         if (!ret)               /* more reserved, Continuous, Master Mode */
 290                 ret = mt9m032_write(client, MT9M032_READ_MODE1, 0x8000 |
 291                                     MT9M032_READ_MODE1_STROBE_START_EXP |
 292                                     MT9M032_READ_MODE1_STROBE_END_SHUTTER);
 293         if (!ret) {
 294                 reg_val = (pll.p1 == 6 ? MT9M032_FORMATTER1_PLL_P1_6 : 0)
 295                         | MT9M032_FORMATTER1_PARALLEL | 0x001e; /* 14-bit */
 296                 ret = mt9m032_write(client, MT9M032_FORMATTER1, reg_val);
 297         }
 298
 299         return ret;
 300 }
 301
 302 /* -----------------------------------------------------------------------------
 303  * Subdev pad operations
 304  */
 305
 306 static int mt9m032_enum_mbus_code(struct v4l2_subdev *subdev,
 307                                   struct v4l2_subdev_pad_config *cfg,
 308                                   struct v4l2_subdev_mbus_code_enum *code)
 309 {
 310         if (code->index != 0)
 311                 return -EINVAL;
 312
 313         code->code = MEDIA_BUS_FMT_Y8_1X8;
 314         return 0;
 315 }
 316
 317 static int mt9m032_enum_frame_size(struct v4l2_subdev *subdev,
 318                                    struct v4l2_subdev_pad_config *cfg,
 319                                    struct v4l2_subdev_frame_size_enum *fse)
 320 {
 321         if (fse->index != 0 || fse->code != MEDIA_BUS_FMT_Y8_1X8)
 322                 return -EINVAL;
 323
 324         fse->min_width = MT9M032_COLUMN_SIZE_DEF;
 325         fse->max_width = MT9M032_COLUMN_SIZE_DEF;
 326         fse->min_height = MT9M032_ROW_SIZE_DEF;
 327         fse->max_height = MT9M032_ROW_SIZE_DEF;
 328
 329         return 0;
 330 }
 331
 332 /**
 333  * __mt9m032_get_pad_crop() - get crop rect
 334  * @sensor: pointer to the sensor struct
 335  * @cfg: v4l2_subdev_pad_config for getting the try crop rect from
 336  * @which: select try or active crop rect
 337  *
 338  * Returns a pointer the current active or fh relative try crop rect
 339  */
 340 static struct v4l2_rect *
 341 __mt9m032_get_pad_crop(struct mt9m032 *sensor, struct v4l2_subdev_pad_config *cfg,
 342                        enum v4l2_subdev_format_whence which)
 343 {
 344         switch (which) {
 345         case V4L2_SUBDEV_FORMAT_TRY:
 346                 return v4l2_subdev_get_try_crop(&sensor->subdev, cfg, 0);
 347         case V4L2_SUBDEV_FORMAT_ACTIVE:
 348                 return &sensor->crop;
 349         default:
 350                 return NULL;
 351         }
 352 }
 353
 354 /**
 355  * __mt9m032_get_pad_format() - get format
 356  * @sensor: pointer to the sensor struct
 357  * @cfg: v4l2_subdev_pad_config for getting the try format from
 358  * @which: select try or active format
 359  *
 360  * Returns a pointer the current active or fh relative try format
 361  */
 362 static struct v4l2_mbus_framefmt *
 363 __mt9m032_get_pad_format(struct mt9m032 *sensor, struct v4l2_subdev_pad_config *cfg,
 364                          enum v4l2_subdev_format_whence which)
 365 {
 366         switch (which) {
 367         case V4L2_SUBDEV_FORMAT_TRY:
 368                 return v4l2_subdev_get_try_format(&sensor->subdev, cfg, 0);
 369         case V4L2_SUBDEV_FORMAT_ACTIVE:
 370                 return &sensor->format;
 371         default:
 372                 return NULL;
 373         }
 374 }
 375
 376 static int mt9m032_get_pad_format(struct v4l2_subdev *subdev,
 377                                   struct v4l2_subdev_pad_config *cfg,
 378                                   struct v4l2_subdev_format *fmt)
 379 {
 380         struct mt9m032 *sensor = to_mt9m032(subdev);
 381
 382         mutex_lock(&sensor->lock);
 383         fmt->format = *__mt9m032_get_pad_format(sensor, cfg, fmt->which);
 384         mutex_unlock(&sensor->lock);
 385
 386         return 0;
 387 }
 388
 389 static int mt9m032_set_pad_format(struct v4l2_subdev *subdev,
 390                                   struct v4l2_subdev_pad_config *cfg,
 391                                   struct v4l2_subdev_format *fmt)
 392 {
 393         struct mt9m032 *sensor = to_mt9m032(subdev);
 394         int ret;
 395
 396         mutex_lock(&sensor->lock);
 397
 398         if (sensor->streaming && fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
 399                 ret = -EBUSY;
 400                 goto done;
 401         }
 402
 403         /* Scaling is not supported, the format is thus fixed. */
 404         fmt->format = *__mt9m032_get_pad_format(sensor, cfg, fmt->which);
 405         ret = 0;
 406
 407 done:
 408         mutex_unlock(&sensor->lock);
 409         return ret;
 410 }
 411
 412 static int mt9m032_get_pad_selection(struct v4l2_subdev *subdev,
 413                                      struct v4l2_subdev_pad_config *cfg,
 414                                      struct v4l2_subdev_selection *sel)
 415 {
 416         struct mt9m032 *sensor = to_mt9m032(subdev);
 417
 418         if (sel->target != V4L2_SEL_TGT_CROP)
 419                 return -EINVAL;
 420
 421         mutex_lock(&sensor->lock);
 422         sel->r = *__mt9m032_get_pad_crop(sensor, cfg, sel->which);
 423         mutex_unlock(&sensor->lock);
 424
 425         return 0;
 426 }
 427
 428 static int mt9m032_set_pad_selection(struct v4l2_subdev *subdev,
 429                                      struct v4l2_subdev_pad_config *cfg,
 430                                      struct v4l2_subdev_selection *sel)
 431 {
 432         struct mt9m032 *sensor = to_mt9m032(subdev);
 433         struct v4l2_mbus_framefmt *format;
 434         struct v4l2_rect *__crop;
 435         struct v4l2_rect rect;
 436         int ret = 0;
 437
 438         if (sel->target != V4L2_SEL_TGT_CROP)
 439                 return -EINVAL;
 440
 441         mutex_lock(&sensor->lock);
 442
 443         if (sensor->streaming && sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
 444                 ret = -EBUSY;
 445                 goto done;
 446         }
 447
 448         /* Clamp the crop rectangle boundaries and align them to a multiple of 2
 449          * pixels to ensure a GRBG Bayer pattern.
 450          */
 451         rect.left = clamp(ALIGN(sel->r.left, 2), MT9M032_COLUMN_START_MIN,
 452                           MT9M032_COLUMN_START_MAX);
 453         rect.top = clamp(ALIGN(sel->r.top, 2), MT9M032_ROW_START_MIN,
 454                          MT9M032_ROW_START_MAX);
 455         rect.width = clamp_t(unsigned int, ALIGN(sel->r.width, 2),
 456                              MT9M032_COLUMN_SIZE_MIN, MT9M032_COLUMN_SIZE_MAX);
 457         rect.height = clamp_t(unsigned int, ALIGN(sel->r.height, 2),
 458                               MT9M032_ROW_SIZE_MIN, MT9M032_ROW_SIZE_MAX);
 459
 460         rect.width = min_t(unsigned int, rect.width,
 461                            MT9M032_PIXEL_ARRAY_WIDTH - rect.left);
 462         rect.height = min_t(unsigned int, rect.height,
 463                             MT9M032_PIXEL_ARRAY_HEIGHT - rect.top);
 464
 465         __crop = __mt9m032_get_pad_crop(sensor, cfg, sel->which);
 466
 467         if (rect.width != __crop->width || rect.height != __crop->height) {
 468                 /* Reset the output image size if the crop rectangle size has
 469                  * been modified.
 470                  */
 471                 format = __mt9m032_get_pad_format(sensor, cfg, sel->which);
 472                 format->width = rect.width;
 473                 format->height = rect.height;
 474         }
 475
 476         *__crop = rect;
 477         sel->r = rect;
 478
 479         if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE)
 480                 ret = mt9m032_update_geom_timing(sensor);
 481
 482 done:
 483         mutex_unlock(&sensor->lock);
 484         return ret;
 485 }
 486
 487 static int mt9m032_get_frame_interval(struct v4l2_subdev *subdev,
 488                                       struct v4l2_subdev_frame_interval *fi)
 489 {
 490         struct mt9m032 *sensor = to_mt9m032(subdev);
 491
 492         mutex_lock(&sensor->lock);
 493         memset(fi, 0, sizeof(*fi));
 494         fi->interval = sensor->frame_interval;
 495         mutex_unlock(&sensor->lock);
 496
 497         return 0;
 498 }
 499
 500 static int mt9m032_set_frame_interval(struct v4l2_subdev *subdev,
 501                                       struct v4l2_subdev_frame_interval *fi)
 502 {
 503         struct mt9m032 *sensor = to_mt9m032(subdev);
 504         int ret;
 505
 506         mutex_lock(&sensor->lock);
 507
 508         if (sensor->streaming) {
 509                 ret = -EBUSY;
 510                 goto done;
 511         }
 512
 513         /* Avoid divisions by 0. */
 514         if (fi->interval.denominator == 0)
 515                 fi->interval.denominator = 1;
 516
 517         ret = mt9m032_update_timing(sensor, &fi->interval);
 518         if (!ret)
 519                 sensor->frame_interval = fi->interval;
 520
 521 done:
 522         mutex_unlock(&sensor->lock);
 523         return ret;
 524 }
 525
 526 static int mt9m032_s_stream(struct v4l2_subdev *subdev, int streaming)
 527 {
 528         struct mt9m032 *sensor = to_mt9m032(subdev);
 529         int ret;
 530
 531         mutex_lock(&sensor->lock);
 532         ret = update_formatter2(sensor, streaming);
 533         if (!ret)
 534                 sensor->streaming = streaming;
 535         mutex_unlock(&sensor->lock);
 536
 537         return ret;
 538 }
 539
 540 /* -----------------------------------------------------------------------------
 541  * V4L2 subdev core operations
 542  */
 543
 544 #ifdef CONFIG_VIDEO_ADV_DEBUG
 545 static int mt9m032_g_register(struct v4l2_subdev *sd,
 546                               struct v4l2_dbg_register *reg)
 547 {
 548         struct mt9m032 *sensor = to_mt9m032(sd);
 549         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 550         int val;
 551
 552         if (reg->reg > 0xff)
 553                 return -EINVAL;
 554
 555         val = mt9m032_read(client, reg->reg);
 556         if (val < 0)
 557                 return -EIO;
 558
 559         reg->size = 2;
 560         reg->val = val;
 561
 562         return 0;
 563 }
 564
 565 static int mt9m032_s_register(struct v4l2_subdev *sd,
 566                               const struct v4l2_dbg_register *reg)
 567 {
 568         struct mt9m032 *sensor = to_mt9m032(sd);
 569         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 570
 571         if (reg->reg > 0xff)
 572                 return -EINVAL;
 573
 574         return mt9m032_write(client, reg->reg, reg->val);
 575 }
 576 #endif
 577
 578 /* -----------------------------------------------------------------------------
 579  * V4L2 subdev control operations
 580  */
 581
 582 static int update_read_mode2(struct mt9m032 *sensor, bool vflip, bool hflip)
 583 {
 584         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 585         int reg_val = (vflip << MT9M032_READ_MODE2_VFLIP_SHIFT)
 586                     | (hflip << MT9M032_READ_MODE2_HFLIP_SHIFT)
 587                     | MT9M032_READ_MODE2_ROW_BLC
 588                     | 0x0007;
 589
 590         return mt9m032_write(client, MT9M032_READ_MODE2, reg_val);
 591 }
 592
 593 static int mt9m032_set_gain(struct mt9m032 *sensor, s32 val)
 594 {
 595         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 596         int digital_gain_val;   /* in 1/8th (0..127) */
 597         int analog_mul;         /* 0 or 1 */
 598         int analog_gain_val;    /* in 1/16th. (0..63) */
 599         u16 reg_val;
 600
 601         digital_gain_val = 51; /* from setup example */
 602
 603         if (val < 63) {
 604                 analog_mul = 0;
 605                 analog_gain_val = val;
 606         } else {
 607                 analog_mul = 1;
 608                 analog_gain_val = val / 2;
 609         }
 610
 611         /* a_gain = (1 + analog_mul) + (analog_gain_val + 1) / 16 */
 612         /* overall_gain = a_gain * (1 + digital_gain_val / 8) */
 613
 614         reg_val = ((digital_gain_val & MT9M032_GAIN_DIGITAL_MASK)
 615                    << MT9M032_GAIN_DIGITAL_SHIFT)
 616                 | ((analog_mul & 1) << MT9M032_GAIN_AMUL_SHIFT)
 617                 | (analog_gain_val & MT9M032_GAIN_ANALOG_MASK);
 618
 619         return mt9m032_write(client, MT9M032_GAIN_ALL, reg_val);
 620 }
 621
 622 static int mt9m032_try_ctrl(struct v4l2_ctrl *ctrl)
 623 {
 624         if (ctrl->id == V4L2_CID_GAIN && ctrl->val >= 63) {
 625                 /* round because of multiplier used for values >= 63 */
 626                 ctrl->val &= ~1;
 627         }
 628
 629         return 0;
 630 }
 631
 632 static int mt9m032_set_ctrl(struct v4l2_ctrl *ctrl)
 633 {
 634         struct mt9m032 *sensor =
 635                 container_of(ctrl->handler, struct mt9m032, ctrls);
 636         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 637         int ret;
 638
 639         switch (ctrl->id) {
 640         case V4L2_CID_GAIN:
 641                 return mt9m032_set_gain(sensor, ctrl->val);
 642
 643         case V4L2_CID_HFLIP:
 644         /* case V4L2_CID_VFLIP: -- In the same cluster */
 645                 return update_read_mode2(sensor, sensor->vflip->val,
 646                                          sensor->hflip->val);
 647
 648         case V4L2_CID_EXPOSURE:
 649                 ret = mt9m032_write(client, MT9M032_SHUTTER_WIDTH_HIGH,
 650                                     (ctrl->val >> 16) & 0xffff);
 651                 if (ret < 0)
 652                         return ret;
 653
 654                 return mt9m032_write(client, MT9M032_SHUTTER_WIDTH_LOW,
 655                                      ctrl->val & 0xffff);
 656         }
 657
 658         return 0;
 659 }
 660
 661 static const struct v4l2_ctrl_ops mt9m032_ctrl_ops = {
 662         .s_ctrl = mt9m032_set_ctrl,
 663         .try_ctrl = mt9m032_try_ctrl,
 664 };
 665
 666 /* -------------------------------------------------------------------------- */
 667
 668 static const struct v4l2_subdev_core_ops mt9m032_core_ops = {
 669 #ifdef CONFIG_VIDEO_ADV_DEBUG
 670         .g_register = mt9m032_g_register,
 671         .s_register = mt9m032_s_register,
 672 #endif
 673 };
 674
 675 static const struct v4l2_subdev_video_ops mt9m032_video_ops = {
 676         .s_stream = mt9m032_s_stream,
 677         .g_frame_interval = mt9m032_get_frame_interval,
 678         .s_frame_interval = mt9m032_set_frame_interval,
 679 };
 680
 681 static const struct v4l2_subdev_pad_ops mt9m032_pad_ops = {
 682         .enum_mbus_code = mt9m032_enum_mbus_code,
 683         .enum_frame_size = mt9m032_enum_frame_size,
 684         .get_fmt = mt9m032_get_pad_format,
 685         .set_fmt = mt9m032_set_pad_format,
 686         .set_selection = mt9m032_set_pad_selection,
 687         .get_selection = mt9m032_get_pad_selection,
 688 };
 689
 690 static const struct v4l2_subdev_ops mt9m032_ops = {
 691         .core = &mt9m032_core_ops,
 692         .video = &mt9m032_video_ops,
 693         .pad = &mt9m032_pad_ops,
 694 };
 695
 696 /* -----------------------------------------------------------------------------
 697  * Driver initialization and probing
 698  */
 699
 700 static int mt9m032_probe(struct i2c_client *client,
 701                          const struct i2c_device_id *devid)
 702 {
 703         struct mt9m032_platform_data *pdata = client->dev.platform_data;
 704         struct i2c_adapter *adapter = client->adapter;
 705         struct mt9m032 *sensor;
 706         int chip_version;
 707         int ret;
 708
 709         if (pdata == NULL) {
 710                 dev_err(&client->dev, "No platform data\n");
 711                 return -EINVAL;
 712         }
 713
 714         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
 715                 dev_warn(&client->dev,
 716                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
 717                 return -EIO;
 718         }
 719
 720         if (!client->dev.platform_data)
 721                 return -ENODEV;
 722
 723         sensor = devm_kzalloc(&client->dev, sizeof(*sensor), GFP_KERNEL);
 724         if (sensor == NULL)
 725                 return -ENOMEM;
 726
 727         mutex_init(&sensor->lock);
 728
 729         sensor->pdata = pdata;
 730
 731         v4l2_i2c_subdev_init(&sensor->subdev, client, &mt9m032_ops);
 732         sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 733
 734         chip_version = mt9m032_read(client, MT9M032_CHIP_VERSION);
 735         if (chip_version != MT9M032_CHIP_VERSION_VALUE) {
 736                 dev_err(&client->dev, "MT9M032 not detected, wrong version "
 737                         "0x%04x\n", chip_version);
 738                 ret = -ENODEV;
 739                 goto error_sensor;
 740         }
 741
 742         dev_info(&client->dev, "MT9M032 detected at address 0x%02x\n",
 743                  client->addr);
 744
 745         sensor->frame_interval.numerator = 1;
 746         sensor->frame_interval.denominator = 30;
 747
 748         sensor->crop.left = MT9M032_COLUMN_START_DEF;
 749         sensor->crop.top = MT9M032_ROW_START_DEF;
 750         sensor->crop.width = MT9M032_COLUMN_SIZE_DEF;
 751         sensor->crop.height = MT9M032_ROW_SIZE_DEF;
 752
 753         sensor->format.width = sensor->crop.width;
 754         sensor->format.height = sensor->crop.height;
 755         sensor->format.code = MEDIA_BUS_FMT_Y8_1X8;
 756         sensor->format.field = V4L2_FIELD_NONE;
 757         sensor->format.colorspace = V4L2_COLORSPACE_SRGB;
 758
 759         v4l2_ctrl_handler_init(&sensor->ctrls, 5);
 760
 761         v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
 762                           V4L2_CID_GAIN, 0, 127, 1, 64);
 763
 764         sensor->hflip = v4l2_ctrl_new_std(&sensor->ctrls,
 765                                           &mt9m032_ctrl_ops,
 766                                           V4L2_CID_HFLIP, 0, 1, 1, 0);
 767         sensor->vflip = v4l2_ctrl_new_std(&sensor->ctrls,
 768                                           &mt9m032_ctrl_ops,
 769                                           V4L2_CID_VFLIP, 0, 1, 1, 0);
 770
 771         v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
 772                           V4L2_CID_EXPOSURE, MT9M032_SHUTTER_WIDTH_MIN,
 773                           MT9M032_SHUTTER_WIDTH_MAX, 1,
 774                           MT9M032_SHUTTER_WIDTH_DEF);
 775         v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
 776                           V4L2_CID_PIXEL_RATE, pdata->pix_clock,
 777                           pdata->pix_clock, 1, pdata->pix_clock);
 778
 779         if (sensor->ctrls.error) {
 780                 ret = sensor->ctrls.error;
 781                 dev_err(&client->dev, "control initialization error %d\n", ret);
 782                 goto error_ctrl;
 783         }
 784
 785         v4l2_ctrl_cluster(2, &sensor->hflip);
 786
 787         sensor->subdev.ctrl_handler = &sensor->ctrls;
 788         sensor->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
 789         sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
 790         ret = media_entity_pads_init(&sensor->subdev.entity, 1, &sensor->pad);
 791         if (ret < 0)
 792                 goto error_ctrl;
 793
 794         ret = mt9m032_write(client, MT9M032_RESET, 1);  /* reset on */
 795         if (ret < 0)
 796                 goto error_entity;
 797         ret = mt9m032_write(client, MT9M032_RESET, 0);  /* reset off */
 798         if (ret < 0)
 799                 goto error_entity;
 800
 801         ret = mt9m032_setup_pll(sensor);
 802         if (ret < 0)
 803                 goto error_entity;
 804         usleep_range(10000, 11000);
 805
 806         ret = v4l2_ctrl_handler_setup(&sensor->ctrls);
 807         if (ret < 0)
 808                 goto error_entity;
 809
 810         /* SIZE */
 811         ret = mt9m032_update_geom_timing(sensor);
 812         if (ret < 0)
 813                 goto error_entity;
 814
 815         ret = mt9m032_write(client, 0x41, 0x0000);      /* reserved !!! */
 816         if (ret < 0)
 817                 goto error_entity;
 818         ret = mt9m032_write(client, 0x42, 0x0003);      /* reserved !!! */
 819         if (ret < 0)
 820                 goto error_entity;
 821         ret = mt9m032_write(client, 0x43, 0x0003);      /* reserved !!! */
 822         if (ret < 0)
 823                 goto error_entity;
 824         ret = mt9m032_write(client, 0x7f, 0x0000);      /* reserved !!! */
 825         if (ret < 0)
 826                 goto error_entity;
 827         if (sensor->pdata->invert_pixclock) {
 828                 ret = mt9m032_write(client, MT9M032_PIX_CLK_CTRL,
 829                                     MT9M032_PIX_CLK_CTRL_INV_PIXCLK);
 830                 if (ret < 0)
 831                         goto error_entity;
 832         }
 833
 834         ret = mt9m032_write(client, MT9M032_RESTART, 1); /* Restart on */
 835         if (ret < 0)
 836                 goto error_entity;
 837         msleep(100);
 838         ret = mt9m032_write(client, MT9M032_RESTART, 0); /* Restart off */
 839         if (ret < 0)
 840                 goto error_entity;
 841         msleep(100);
 842         ret = update_formatter2(sensor, false);
 843         if (ret < 0)
 844                 goto error_entity;
 845
 846         return ret;
 847
 848 error_entity:
 849         media_entity_cleanup(&sensor->subdev.entity);
 850 error_ctrl:
 851         v4l2_ctrl_handler_free(&sensor->ctrls);
 852 error_sensor:
 853         mutex_destroy(&sensor->lock);
 854         return ret;
 855 }
 856
 857 static int mt9m032_remove(struct i2c_client *client)
 858 {
 859         struct v4l2_subdev *subdev = i2c_get_clientdata(client);
 860         struct mt9m032 *sensor = to_mt9m032(subdev);
 861
 862         v4l2_device_unregister_subdev(subdev);
 863         v4l2_ctrl_handler_free(&sensor->ctrls);
 864         media_entity_cleanup(&subdev->entity);
 865         mutex_destroy(&sensor->lock);
 866         return 0;
 867 }
 868
 869 static const struct i2c_device_id mt9m032_id_table[] = {
 870         { MT9M032_NAME, 0 },
 871         { }
 872 };
 873
 874 MODULE_DEVICE_TABLE(i2c, mt9m032_id_table);
 875
 876 static struct i2c_driver mt9m032_i2c_driver = {
 877         .driver = {
 878                 .name = MT9M032_NAME,
 879         },
 880         .probe = mt9m032_probe,
 881         .remove = mt9m032_remove,
 882         .id_table = mt9m032_id_table,
 883 };
 884
 885 module_i2c_driver(mt9m032_i2c_driver);
 886
 887 MODULE_AUTHOR("Martin Hostettler <martin@neutronstar.dyndns.org>");
 888 MODULE_DESCRIPTION("MT9M032 camera sensor driver");
 889 MODULE_LICENSE("GPL v2");