drivers/media/i2c/mt9m032.c

   1 /*
   2  * Driver for MT9M032 CMOS Image Sensor from Micron
   3  *
   4  * Copyright (C) 2010-2011 Lund Engineering
   5  * Contact: Gil Lund <gwlund@lundeng.com>
   6  * Author: Martin Hostettler <martin@neutronstar.dyndns.org>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 #include <linux/delay.h>
  19 #include <linux/i2c.h>
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/math64.h>
  23 #include <linux/module.h>
  24 #include <linux/mutex.h>
  25 #include <linux/slab.h>
  26 #include <linux/v4l2-mediabus.h>
  27
  28 #include <media/media-entity.h>
  29 #include <media/i2c/mt9m032.h>
  30 #include <media/v4l2-ctrls.h>
  31 #include <media/v4l2-device.h>
  32 #include <media/v4l2-subdev.h>
  33
  34 #include "aptina-pll.h"
  35
  36 /*
  37  * width and height include active boundary and black parts
  38  *
  39  * column    0-  15 active boundary
  40  * column   16-1455 image
  41  * column 1456-1471 active boundary
  42  * column 1472-1599 black
  43  *
  44  * row       0-  51 black
  45  * row      53-  59 active boundary
  46  * row      60-1139 image
  47  * row    1140-1147 active boundary
  48  * row    1148-1151 black
  49  */
  50
  51 #define MT9M032_PIXEL_ARRAY_WIDTH                       1600
  52 #define MT9M032_PIXEL_ARRAY_HEIGHT                      1152
  53
  54 #define MT9M032_CHIP_VERSION                            0x00
  55 #define         MT9M032_CHIP_VERSION_VALUE              0x1402
  56 #define MT9M032_ROW_START                               0x01
  57 #define         MT9M032_ROW_START_MIN                   0
  58 #define         MT9M032_ROW_START_MAX                   1152
  59 #define         MT9M032_ROW_START_DEF                   60
  60 #define MT9M032_COLUMN_START                            0x02
  61 #define         MT9M032_COLUMN_START_MIN                0
  62 #define         MT9M032_COLUMN_START_MAX                1600
  63 #define         MT9M032_COLUMN_START_DEF                16
  64 #define MT9M032_ROW_SIZE                                0x03
  65 #define         MT9M032_ROW_SIZE_MIN                    32
  66 #define         MT9M032_ROW_SIZE_MAX                    1152
  67 #define         MT9M032_ROW_SIZE_DEF                    1080
  68 #define MT9M032_COLUMN_SIZE                             0x04
  69 #define         MT9M032_COLUMN_SIZE_MIN                 32
  70 #define         MT9M032_COLUMN_SIZE_MAX                 1600
  71 #define         MT9M032_COLUMN_SIZE_DEF                 1440
  72 #define MT9M032_HBLANK                                  0x05
  73 #define MT9M032_VBLANK                                  0x06
  74 #define         MT9M032_VBLANK_MAX                      0x7ff
  75 #define MT9M032_SHUTTER_WIDTH_HIGH                      0x08
  76 #define MT9M032_SHUTTER_WIDTH_LOW                       0x09
  77 #define         MT9M032_SHUTTER_WIDTH_MIN               1
  78 #define         MT9M032_SHUTTER_WIDTH_MAX               1048575
  79 #define         MT9M032_SHUTTER_WIDTH_DEF               1943
  80 #define MT9M032_PIX_CLK_CTRL                            0x0a
  81 #define         MT9M032_PIX_CLK_CTRL_INV_PIXCLK         0x8000
  82 #define MT9M032_RESTART                                 0x0b
  83 #define MT9M032_RESET                                   0x0d
  84 #define MT9M032_PLL_CONFIG1                             0x11
  85 #define         MT9M032_PLL_CONFIG1_PREDIV_MASK         0x3f
  86 #define         MT9M032_PLL_CONFIG1_MUL_SHIFT           8
  87 #define MT9M032_READ_MODE1                              0x1e
  88 #define         MT9M032_READ_MODE1_OUTPUT_BAD_FRAMES    (1 << 13)
  89 #define         MT9M032_READ_MODE1_MAINTAIN_FRAME_RATE  (1 << 12)
  90 #define         MT9M032_READ_MODE1_XOR_LINE_VALID       (1 << 11)
  91 #define         MT9M032_READ_MODE1_CONT_LINE_VALID      (1 << 10)
  92 #define         MT9M032_READ_MODE1_INVERT_TRIGGER       (1 << 9)
  93 #define         MT9M032_READ_MODE1_SNAPSHOT             (1 << 8)
  94 #define         MT9M032_READ_MODE1_GLOBAL_RESET         (1 << 7)
  95 #define         MT9M032_READ_MODE1_BULB_EXPOSURE        (1 << 6)
  96 #define         MT9M032_READ_MODE1_INVERT_STROBE        (1 << 5)
  97 #define         MT9M032_READ_MODE1_STROBE_ENABLE        (1 << 4)
  98 #define         MT9M032_READ_MODE1_STROBE_START_TRIG1   (0 << 2)
  99 #define         MT9M032_READ_MODE1_STROBE_START_EXP     (1 << 2)
 100 #define         MT9M032_READ_MODE1_STROBE_START_SHUTTER (2 << 2)
 101 #define         MT9M032_READ_MODE1_STROBE_START_TRIG2   (3 << 2)
 102 #define         MT9M032_READ_MODE1_STROBE_END_TRIG1     (0 << 0)
 103 #define         MT9M032_READ_MODE1_STROBE_END_EXP       (1 << 0)
 104 #define         MT9M032_READ_MODE1_STROBE_END_SHUTTER   (2 << 0)
 105 #define         MT9M032_READ_MODE1_STROBE_END_TRIG2     (3 << 0)
 106 #define MT9M032_READ_MODE2                              0x20
 107 #define         MT9M032_READ_MODE2_VFLIP_SHIFT          15
 108 #define         MT9M032_READ_MODE2_HFLIP_SHIFT          14
 109 #define         MT9M032_READ_MODE2_ROW_BLC              0x40
 110 #define MT9M032_GAIN_GREEN1                             0x2b
 111 #define MT9M032_GAIN_BLUE                               0x2c
 112 #define MT9M032_GAIN_RED                                0x2d
 113 #define MT9M032_GAIN_GREEN2                             0x2e
 114
 115 /* write only */
 116 #define MT9M032_GAIN_ALL                                0x35
 117 #define         MT9M032_GAIN_DIGITAL_MASK               0x7f
 118 #define         MT9M032_GAIN_DIGITAL_SHIFT              8
 119 #define         MT9M032_GAIN_AMUL_SHIFT                 6
 120 #define         MT9M032_GAIN_ANALOG_MASK                0x3f
 121 #define MT9M032_FORMATTER1                              0x9e
 122 #define         MT9M032_FORMATTER1_PLL_P1_6             (1 << 8)
 123 #define         MT9M032_FORMATTER1_PARALLEL             (1 << 12)
 124 #define MT9M032_FORMATTER2                              0x9f
 125 #define         MT9M032_FORMATTER2_DOUT_EN              0x1000
 126 #define         MT9M032_FORMATTER2_PIXCLK_EN            0x2000
 127
 128 /*
 129  * The available MT9M032 datasheet is missing documentation for register 0x10
 130  * MT9P031 seems to be close enough, so use constants from that datasheet for
 131  * now.
 132  * But keep the name MT9P031 to remind us, that this isn't really confirmed
 133  * for this sensor.
 134  */
 135 #define MT9P031_PLL_CONTROL                             0x10
 136 #define         MT9P031_PLL_CONTROL_PWROFF              0x0050
 137 #define         MT9P031_PLL_CONTROL_PWRON               0x0051
 138 #define         MT9P031_PLL_CONTROL_USEPLL              0x0052
 139
 140 struct mt9m032 {
 141         struct v4l2_subdev subdev;
 142         struct media_pad pad;
 143         struct mt9m032_platform_data *pdata;
 144
 145         unsigned int pix_clock;
 146
 147         struct v4l2_ctrl_handler ctrls;
 148         struct {
 149                 struct v4l2_ctrl *hflip;
 150                 struct v4l2_ctrl *vflip;
 151         };
 152
 153         struct mutex lock; /* Protects streaming, format, interval and crop */
 154
 155         bool streaming;
 156
 157         struct v4l2_mbus_framefmt format;
 158         struct v4l2_rect crop;
 159         struct v4l2_fract frame_interval;
 160 };
 161
 162 #define to_mt9m032(sd)  container_of(sd, struct mt9m032, subdev)
 163 #define to_dev(sensor) \
 164         (&((struct i2c_client *)v4l2_get_subdevdata(&(sensor)->subdev))->dev)
 165
 166 static int mt9m032_read(struct i2c_client *client, u8 reg)
 167 {
 168         return i2c_smbus_read_word_swapped(client, reg);
 169 }
 170
 171 static int mt9m032_write(struct i2c_client *client, u8 reg, const u16 data)
 172 {
 173         return i2c_smbus_write_word_swapped(client, reg, data);
 174 }
 175
 176 static u32 mt9m032_row_time(struct mt9m032 *sensor, unsigned int width)
 177 {
 178         unsigned int effective_width;
 179         u32 ns;
 180
 181         effective_width = width + 716; /* empirical value */
 182         ns = div_u64(1000000000ULL * effective_width, sensor->pix_clock);
 183         dev_dbg(to_dev(sensor), "MT9M032 line time: %u ns\n", ns);
 184         return ns;
 185 }
 186
 187 static int mt9m032_update_timing(struct mt9m032 *sensor,
 188                                  struct v4l2_fract *interval)
 189 {
 190         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 191         struct v4l2_rect *crop = &sensor->crop;
 192         unsigned int min_vblank;
 193         unsigned int vblank;
 194         u32 row_time;
 195
 196         if (!interval)
 197                 interval = &sensor->frame_interval;
 198
 199         row_time = mt9m032_row_time(sensor, crop->width);
 200
 201         vblank = div_u64(1000000000ULL * interval->numerator,
 202                          (u64)row_time * interval->denominator)
 203                - crop->height;
 204
 205         if (vblank > MT9M032_VBLANK_MAX) {
 206                 /* hardware limits to 11 bit values */
 207                 interval->denominator = 1000;
 208                 interval->numerator =
 209                         div_u64((crop->height + MT9M032_VBLANK_MAX) *
 210                                 (u64)row_time * interval->denominator,
 211                                 1000000000ULL);
 212                 vblank = div_u64(1000000000ULL * interval->numerator,
 213                                  (u64)row_time * interval->denominator)
 214                        - crop->height;
 215         }
 216         /* enforce minimal 1.6ms blanking time. */
 217         min_vblank = 1600000 / row_time;
 218         vblank = clamp_t(unsigned int, vblank, min_vblank, MT9M032_VBLANK_MAX);
 219
 220         return mt9m032_write(client, MT9M032_VBLANK, vblank);
 221 }
 222
 223 static int mt9m032_update_geom_timing(struct mt9m032 *sensor)
 224 {
 225         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 226         int ret;
 227
 228         ret = mt9m032_write(client, MT9M032_COLUMN_SIZE,
 229                             sensor->crop.width - 1);
 230         if (!ret)
 231                 ret = mt9m032_write(client, MT9M032_ROW_SIZE,
 232                                     sensor->crop.height - 1);
 233         if (!ret)
 234                 ret = mt9m032_write(client, MT9M032_COLUMN_START,
 235                                     sensor->crop.left);
 236         if (!ret)
 237                 ret = mt9m032_write(client, MT9M032_ROW_START,
 238                                     sensor->crop.top);
 239         if (!ret)
 240                 ret = mt9m032_update_timing(sensor, NULL);
 241         return ret;
 242 }
 243
 244 static int update_formatter2(struct mt9m032 *sensor, bool streaming)
 245 {
 246         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 247         u16 reg_val =   MT9M032_FORMATTER2_DOUT_EN
 248                       | 0x0070;  /* parts reserved! */
 249                                  /* possibly for changing to 14-bit mode */
 250
 251         if (streaming)
 252                 reg_val |= MT9M032_FORMATTER2_PIXCLK_EN;   /* pixclock enable */
 253
 254         return mt9m032_write(client, MT9M032_FORMATTER2, reg_val);
 255 }
 256
 257 static int mt9m032_setup_pll(struct mt9m032 *sensor)
 258 {
 259         static const struct aptina_pll_limits limits = {
 260                 .ext_clock_min = 8000000,
 261                 .ext_clock_max = 16500000,
 262                 .int_clock_min = 2000000,
 263                 .int_clock_max = 24000000,
 264                 .out_clock_min = 322000000,
 265                 .out_clock_max = 693000000,
 266                 .pix_clock_max = 99000000,
 267                 .n_min = 1,
 268                 .n_max = 64,
 269                 .m_min = 16,
 270                 .m_max = 255,
 271                 .p1_min = 6,
 272                 .p1_max = 7,
 273         };
 274
 275         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 276         struct mt9m032_platform_data *pdata = sensor->pdata;
 277         struct aptina_pll pll;
 278         u16 reg_val;
 279         int ret;
 280
 281         pll.ext_clock = pdata->ext_clock;
 282         pll.pix_clock = pdata->pix_clock;
 283
 284         ret = aptina_pll_calculate(&client->dev, &limits, &pll);
 285         if (ret < 0)
 286                 return ret;
 287
 288         sensor->pix_clock = pdata->pix_clock;
 289
 290         ret = mt9m032_write(client, MT9M032_PLL_CONFIG1,
 291                             (pll.m << MT9M032_PLL_CONFIG1_MUL_SHIFT) |
 292                             ((pll.n - 1) & MT9M032_PLL_CONFIG1_PREDIV_MASK));
 293         if (!ret)
 294                 ret = mt9m032_write(client, MT9P031_PLL_CONTROL,
 295                                     MT9P031_PLL_CONTROL_PWRON |
 296                                     MT9P031_PLL_CONTROL_USEPLL);
 297         if (!ret)               /* more reserved, Continuous, Master Mode */
 298                 ret = mt9m032_write(client, MT9M032_READ_MODE1, 0x8000 |
 299                                     MT9M032_READ_MODE1_STROBE_START_EXP |
 300                                     MT9M032_READ_MODE1_STROBE_END_SHUTTER);
 301         if (!ret) {
 302                 reg_val = (pll.p1 == 6 ? MT9M032_FORMATTER1_PLL_P1_6 : 0)
 303                         | MT9M032_FORMATTER1_PARALLEL | 0x001e; /* 14-bit */
 304                 ret = mt9m032_write(client, MT9M032_FORMATTER1, reg_val);
 305         }
 306
 307         return ret;
 308 }
 309
 310 /* -----------------------------------------------------------------------------
 311  * Subdev pad operations
 312  */
 313
 314 static int mt9m032_enum_mbus_code(struct v4l2_subdev *subdev,
 315                                   struct v4l2_subdev_pad_config *cfg,
 316                                   struct v4l2_subdev_mbus_code_enum *code)
 317 {
 318         if (code->index != 0)
 319                 return -EINVAL;
 320
 321         code->code = MEDIA_BUS_FMT_Y8_1X8;
 322         return 0;
 323 }
 324
 325 static int mt9m032_enum_frame_size(struct v4l2_subdev *subdev,
 326                                    struct v4l2_subdev_pad_config *cfg,
 327                                    struct v4l2_subdev_frame_size_enum *fse)
 328 {
 329         if (fse->index != 0 || fse->code != MEDIA_BUS_FMT_Y8_1X8)
 330                 return -EINVAL;
 331
 332         fse->min_width = MT9M032_COLUMN_SIZE_DEF;
 333         fse->max_width = MT9M032_COLUMN_SIZE_DEF;
 334         fse->min_height = MT9M032_ROW_SIZE_DEF;
 335         fse->max_height = MT9M032_ROW_SIZE_DEF;
 336
 337         return 0;
 338 }
 339
 340 /**
 341  * __mt9m032_get_pad_crop() - get crop rect
 342  * @sensor: pointer to the sensor struct
 343  * @cfg: v4l2_subdev_pad_config for getting the try crop rect from
 344  * @which: select try or active crop rect
 345  *
 346  * Returns a pointer the current active or fh relative try crop rect
 347  */
 348 static struct v4l2_rect *
 349 __mt9m032_get_pad_crop(struct mt9m032 *sensor, struct v4l2_subdev_pad_config *cfg,
 350                        enum v4l2_subdev_format_whence which)
 351 {
 352         switch (which) {
 353         case V4L2_SUBDEV_FORMAT_TRY:
 354                 return v4l2_subdev_get_try_crop(&sensor->subdev, cfg, 0);
 355         case V4L2_SUBDEV_FORMAT_ACTIVE:
 356                 return &sensor->crop;
 357         default:
 358                 return NULL;
 359         }
 360 }
 361
 362 /**
 363  * __mt9m032_get_pad_format() - get format
 364  * @sensor: pointer to the sensor struct
 365  * @cfg: v4l2_subdev_pad_config for getting the try format from
 366  * @which: select try or active format
 367  *
 368  * Returns a pointer the current active or fh relative try format
 369  */
 370 static struct v4l2_mbus_framefmt *
 371 __mt9m032_get_pad_format(struct mt9m032 *sensor, struct v4l2_subdev_pad_config *cfg,
 372                          enum v4l2_subdev_format_whence which)
 373 {
 374         switch (which) {
 375         case V4L2_SUBDEV_FORMAT_TRY:
 376                 return v4l2_subdev_get_try_format(&sensor->subdev, cfg, 0);
 377         case V4L2_SUBDEV_FORMAT_ACTIVE:
 378                 return &sensor->format;
 379         default:
 380                 return NULL;
 381         }
 382 }
 383
 384 static int mt9m032_get_pad_format(struct v4l2_subdev *subdev,
 385                                   struct v4l2_subdev_pad_config *cfg,
 386                                   struct v4l2_subdev_format *fmt)
 387 {
 388         struct mt9m032 *sensor = to_mt9m032(subdev);
 389
 390         mutex_lock(&sensor->lock);
 391         fmt->format = *__mt9m032_get_pad_format(sensor, cfg, fmt->which);
 392         mutex_unlock(&sensor->lock);
 393
 394         return 0;
 395 }
 396
 397 static int mt9m032_set_pad_format(struct v4l2_subdev *subdev,
 398                                   struct v4l2_subdev_pad_config *cfg,
 399                                   struct v4l2_subdev_format *fmt)
 400 {
 401         struct mt9m032 *sensor = to_mt9m032(subdev);
 402         int ret;
 403
 404         mutex_lock(&sensor->lock);
 405
 406         if (sensor->streaming && fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
 407                 ret = -EBUSY;
 408                 goto done;
 409         }
 410
 411         /* Scaling is not supported, the format is thus fixed. */
 412         fmt->format = *__mt9m032_get_pad_format(sensor, cfg, fmt->which);
 413         ret = 0;
 414
 415 done:
 416         mutex_unlock(&sensor->lock);
 417         return ret;
 418 }
 419
 420 static int mt9m032_get_pad_selection(struct v4l2_subdev *subdev,
 421                                      struct v4l2_subdev_pad_config *cfg,
 422                                      struct v4l2_subdev_selection *sel)
 423 {
 424         struct mt9m032 *sensor = to_mt9m032(subdev);
 425
 426         if (sel->target != V4L2_SEL_TGT_CROP)
 427                 return -EINVAL;
 428
 429         mutex_lock(&sensor->lock);
 430         sel->r = *__mt9m032_get_pad_crop(sensor, cfg, sel->which);
 431         mutex_unlock(&sensor->lock);
 432
 433         return 0;
 434 }
 435
 436 static int mt9m032_set_pad_selection(struct v4l2_subdev *subdev,
 437                                      struct v4l2_subdev_pad_config *cfg,
 438                                      struct v4l2_subdev_selection *sel)
 439 {
 440         struct mt9m032 *sensor = to_mt9m032(subdev);
 441         struct v4l2_mbus_framefmt *format;
 442         struct v4l2_rect *__crop;
 443         struct v4l2_rect rect;
 444         int ret = 0;
 445
 446         if (sel->target != V4L2_SEL_TGT_CROP)
 447                 return -EINVAL;
 448
 449         mutex_lock(&sensor->lock);
 450
 451         if (sensor->streaming && sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
 452                 ret = -EBUSY;
 453                 goto done;
 454         }
 455
 456         /* Clamp the crop rectangle boundaries and align them to a multiple of 2
 457          * pixels to ensure a GRBG Bayer pattern.
 458          */
 459         rect.left = clamp(ALIGN(sel->r.left, 2), MT9M032_COLUMN_START_MIN,
 460                           MT9M032_COLUMN_START_MAX);
 461         rect.top = clamp(ALIGN(sel->r.top, 2), MT9M032_ROW_START_MIN,
 462                          MT9M032_ROW_START_MAX);
 463         rect.width = clamp_t(unsigned int, ALIGN(sel->r.width, 2),
 464                              MT9M032_COLUMN_SIZE_MIN, MT9M032_COLUMN_SIZE_MAX);
 465         rect.height = clamp_t(unsigned int, ALIGN(sel->r.height, 2),
 466                               MT9M032_ROW_SIZE_MIN, MT9M032_ROW_SIZE_MAX);
 467
 468         rect.width = min_t(unsigned int, rect.width,
 469                            MT9M032_PIXEL_ARRAY_WIDTH - rect.left);
 470         rect.height = min_t(unsigned int, rect.height,
 471                             MT9M032_PIXEL_ARRAY_HEIGHT - rect.top);
 472
 473         __crop = __mt9m032_get_pad_crop(sensor, cfg, sel->which);
 474
 475         if (rect.width != __crop->width || rect.height != __crop->height) {
 476                 /* Reset the output image size if the crop rectangle size has
 477                  * been modified.
 478                  */
 479                 format = __mt9m032_get_pad_format(sensor, cfg, sel->which);
 480                 format->width = rect.width;
 481                 format->height = rect.height;
 482         }
 483
 484         *__crop = rect;
 485         sel->r = rect;
 486
 487         if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE)
 488                 ret = mt9m032_update_geom_timing(sensor);
 489
 490 done:
 491         mutex_unlock(&sensor->lock);
 492         return ret;
 493 }
 494
 495 static int mt9m032_get_frame_interval(struct v4l2_subdev *subdev,
 496                                       struct v4l2_subdev_frame_interval *fi)
 497 {
 498         struct mt9m032 *sensor = to_mt9m032(subdev);
 499
 500         mutex_lock(&sensor->lock);
 501         memset(fi, 0, sizeof(*fi));
 502         fi->interval = sensor->frame_interval;
 503         mutex_unlock(&sensor->lock);
 504
 505         return 0;
 506 }
 507
 508 static int mt9m032_set_frame_interval(struct v4l2_subdev *subdev,
 509                                       struct v4l2_subdev_frame_interval *fi)
 510 {
 511         struct mt9m032 *sensor = to_mt9m032(subdev);
 512         int ret;
 513
 514         mutex_lock(&sensor->lock);
 515
 516         if (sensor->streaming) {
 517                 ret = -EBUSY;
 518                 goto done;
 519         }
 520
 521         /* Avoid divisions by 0. */
 522         if (fi->interval.denominator == 0)
 523                 fi->interval.denominator = 1;
 524
 525         ret = mt9m032_update_timing(sensor, &fi->interval);
 526         if (!ret)
 527                 sensor->frame_interval = fi->interval;
 528
 529 done:
 530         mutex_unlock(&sensor->lock);
 531         return ret;
 532 }
 533
 534 static int mt9m032_s_stream(struct v4l2_subdev *subdev, int streaming)
 535 {
 536         struct mt9m032 *sensor = to_mt9m032(subdev);
 537         int ret;
 538
 539         mutex_lock(&sensor->lock);
 540         ret = update_formatter2(sensor, streaming);
 541         if (!ret)
 542                 sensor->streaming = streaming;
 543         mutex_unlock(&sensor->lock);
 544
 545         return ret;
 546 }
 547
 548 /* -----------------------------------------------------------------------------
 549  * V4L2 subdev core operations
 550  */
 551
 552 #ifdef CONFIG_VIDEO_ADV_DEBUG
 553 static int mt9m032_g_register(struct v4l2_subdev *sd,
 554                               struct v4l2_dbg_register *reg)
 555 {
 556         struct mt9m032 *sensor = to_mt9m032(sd);
 557         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 558         int val;
 559
 560         if (reg->reg > 0xff)
 561                 return -EINVAL;
 562
 563         val = mt9m032_read(client, reg->reg);
 564         if (val < 0)
 565                 return -EIO;
 566
 567         reg->size = 2;
 568         reg->val = val;
 569
 570         return 0;
 571 }
 572
 573 static int mt9m032_s_register(struct v4l2_subdev *sd,
 574                               const struct v4l2_dbg_register *reg)
 575 {
 576         struct mt9m032 *sensor = to_mt9m032(sd);
 577         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 578
 579         if (reg->reg > 0xff)
 580                 return -EINVAL;
 581
 582         return mt9m032_write(client, reg->reg, reg->val);
 583 }
 584 #endif
 585
 586 /* -----------------------------------------------------------------------------
 587  * V4L2 subdev control operations
 588  */
 589
 590 static int update_read_mode2(struct mt9m032 *sensor, bool vflip, bool hflip)
 591 {
 592         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 593         int reg_val = (vflip << MT9M032_READ_MODE2_VFLIP_SHIFT)
 594                     | (hflip << MT9M032_READ_MODE2_HFLIP_SHIFT)
 595                     | MT9M032_READ_MODE2_ROW_BLC
 596                     | 0x0007;
 597
 598         return mt9m032_write(client, MT9M032_READ_MODE2, reg_val);
 599 }
 600
 601 static int mt9m032_set_gain(struct mt9m032 *sensor, s32 val)
 602 {
 603         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 604         int digital_gain_val;   /* in 1/8th (0..127) */
 605         int analog_mul;         /* 0 or 1 */
 606         int analog_gain_val;    /* in 1/16th. (0..63) */
 607         u16 reg_val;
 608
 609         digital_gain_val = 51; /* from setup example */
 610
 611         if (val < 63) {
 612                 analog_mul = 0;
 613                 analog_gain_val = val;
 614         } else {
 615                 analog_mul = 1;
 616                 analog_gain_val = val / 2;
 617         }
 618
 619         /* a_gain = (1 + analog_mul) + (analog_gain_val + 1) / 16 */
 620         /* overall_gain = a_gain * (1 + digital_gain_val / 8) */
 621
 622         reg_val = ((digital_gain_val & MT9M032_GAIN_DIGITAL_MASK)
 623                    << MT9M032_GAIN_DIGITAL_SHIFT)
 624                 | ((analog_mul & 1) << MT9M032_GAIN_AMUL_SHIFT)
 625                 | (analog_gain_val & MT9M032_GAIN_ANALOG_MASK);
 626
 627         return mt9m032_write(client, MT9M032_GAIN_ALL, reg_val);
 628 }
 629
 630 static int mt9m032_try_ctrl(struct v4l2_ctrl *ctrl)
 631 {
 632         if (ctrl->id == V4L2_CID_GAIN && ctrl->val >= 63) {
 633                 /* round because of multiplier used for values >= 63 */
 634                 ctrl->val &= ~1;
 635         }
 636
 637         return 0;
 638 }
 639
 640 static int mt9m032_set_ctrl(struct v4l2_ctrl *ctrl)
 641 {
 642         struct mt9m032 *sensor =
 643                 container_of(ctrl->handler, struct mt9m032, ctrls);
 644         struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
 645         int ret;
 646
 647         switch (ctrl->id) {
 648         case V4L2_CID_GAIN:
 649                 return mt9m032_set_gain(sensor, ctrl->val);
 650
 651         case V4L2_CID_HFLIP:
 652         /* case V4L2_CID_VFLIP: -- In the same cluster */
 653                 return update_read_mode2(sensor, sensor->vflip->val,
 654                                          sensor->hflip->val);
 655
 656         case V4L2_CID_EXPOSURE:
 657                 ret = mt9m032_write(client, MT9M032_SHUTTER_WIDTH_HIGH,
 658                                     (ctrl->val >> 16) & 0xffff);
 659                 if (ret < 0)
 660                         return ret;
 661
 662                 return mt9m032_write(client, MT9M032_SHUTTER_WIDTH_LOW,
 663                                      ctrl->val & 0xffff);
 664         }
 665
 666         return 0;
 667 }
 668
 669 static const struct v4l2_ctrl_ops mt9m032_ctrl_ops = {
 670         .s_ctrl = mt9m032_set_ctrl,
 671         .try_ctrl = mt9m032_try_ctrl,
 672 };
 673
 674 /* -------------------------------------------------------------------------- */
 675
 676 static const struct v4l2_subdev_core_ops mt9m032_core_ops = {
 677 #ifdef CONFIG_VIDEO_ADV_DEBUG
 678         .g_register = mt9m032_g_register,
 679         .s_register = mt9m032_s_register,
 680 #endif
 681 };
 682
 683 static const struct v4l2_subdev_video_ops mt9m032_video_ops = {
 684         .s_stream = mt9m032_s_stream,
 685         .g_frame_interval = mt9m032_get_frame_interval,
 686         .s_frame_interval = mt9m032_set_frame_interval,
 687 };
 688
 689 static const struct v4l2_subdev_pad_ops mt9m032_pad_ops = {
 690         .enum_mbus_code = mt9m032_enum_mbus_code,
 691         .enum_frame_size = mt9m032_enum_frame_size,
 692         .get_fmt = mt9m032_get_pad_format,
 693         .set_fmt = mt9m032_set_pad_format,
 694         .set_selection = mt9m032_set_pad_selection,
 695         .get_selection = mt9m032_get_pad_selection,
 696 };
 697
 698 static const struct v4l2_subdev_ops mt9m032_ops = {
 699         .core = &mt9m032_core_ops,
 700         .video = &mt9m032_video_ops,
 701         .pad = &mt9m032_pad_ops,
 702 };
 703
 704 /* -----------------------------------------------------------------------------
 705  * Driver initialization and probing
 706  */
 707
 708 static int mt9m032_probe(struct i2c_client *client,
 709                          const struct i2c_device_id *devid)
 710 {
 711         struct mt9m032_platform_data *pdata = client->dev.platform_data;
 712         struct i2c_adapter *adapter = client->adapter;
 713         struct mt9m032 *sensor;
 714         int chip_version;
 715         int ret;
 716
 717         if (pdata == NULL) {
 718                 dev_err(&client->dev, "No platform data\n");
 719                 return -EINVAL;
 720         }
 721
 722         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
 723                 dev_warn(&client->dev,
 724                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
 725                 return -EIO;
 726         }
 727
 728         if (!client->dev.platform_data)
 729                 return -ENODEV;
 730
 731         sensor = devm_kzalloc(&client->dev, sizeof(*sensor), GFP_KERNEL);
 732         if (sensor == NULL)
 733                 return -ENOMEM;
 734
 735         mutex_init(&sensor->lock);
 736
 737         sensor->pdata = pdata;
 738
 739         v4l2_i2c_subdev_init(&sensor->subdev, client, &mt9m032_ops);
 740         sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 741
 742         chip_version = mt9m032_read(client, MT9M032_CHIP_VERSION);
 743         if (chip_version != MT9M032_CHIP_VERSION_VALUE) {
 744                 dev_err(&client->dev, "MT9M032 not detected, wrong version "
 745                         "0x%04x\n", chip_version);
 746                 ret = -ENODEV;
 747                 goto error_sensor;
 748         }
 749
 750         dev_info(&client->dev, "MT9M032 detected at address 0x%02x\n",
 751                  client->addr);
 752
 753         sensor->frame_interval.numerator = 1;
 754         sensor->frame_interval.denominator = 30;
 755
 756         sensor->crop.left = MT9M032_COLUMN_START_DEF;
 757         sensor->crop.top = MT9M032_ROW_START_DEF;
 758         sensor->crop.width = MT9M032_COLUMN_SIZE_DEF;
 759         sensor->crop.height = MT9M032_ROW_SIZE_DEF;
 760
 761         sensor->format.width = sensor->crop.width;
 762         sensor->format.height = sensor->crop.height;
 763         sensor->format.code = MEDIA_BUS_FMT_Y8_1X8;
 764         sensor->format.field = V4L2_FIELD_NONE;
 765         sensor->format.colorspace = V4L2_COLORSPACE_SRGB;
 766
 767         v4l2_ctrl_handler_init(&sensor->ctrls, 5);
 768
 769         v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
 770                           V4L2_CID_GAIN, 0, 127, 1, 64);
 771
 772         sensor->hflip = v4l2_ctrl_new_std(&sensor->ctrls,
 773                                           &mt9m032_ctrl_ops,
 774                                           V4L2_CID_HFLIP, 0, 1, 1, 0);
 775         sensor->vflip = v4l2_ctrl_new_std(&sensor->ctrls,
 776                                           &mt9m032_ctrl_ops,
 777                                           V4L2_CID_VFLIP, 0, 1, 1, 0);
 778
 779         v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
 780                           V4L2_CID_EXPOSURE, MT9M032_SHUTTER_WIDTH_MIN,
 781                           MT9M032_SHUTTER_WIDTH_MAX, 1,
 782                           MT9M032_SHUTTER_WIDTH_DEF);
 783         v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
 784                           V4L2_CID_PIXEL_RATE, pdata->pix_clock,
 785                           pdata->pix_clock, 1, pdata->pix_clock);
 786
 787         if (sensor->ctrls.error) {
 788                 ret = sensor->ctrls.error;
 789                 dev_err(&client->dev, "control initialization error %d\n", ret);
 790                 goto error_ctrl;
 791         }
 792
 793         v4l2_ctrl_cluster(2, &sensor->hflip);
 794
 795         sensor->subdev.ctrl_handler = &sensor->ctrls;
 796         sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
 797         ret = media_entity_pads_init(&sensor->subdev.entity, 1, &sensor->pad);
 798         if (ret < 0)
 799                 goto error_ctrl;
 800
 801         ret = mt9m032_write(client, MT9M032_RESET, 1);  /* reset on */
 802         if (ret < 0)
 803                 goto error_entity;
 804         ret = mt9m032_write(client, MT9M032_RESET, 0);  /* reset off */
 805         if (ret < 0)
 806                 goto error_entity;
 807
 808         ret = mt9m032_setup_pll(sensor);
 809         if (ret < 0)
 810                 goto error_entity;
 811         usleep_range(10000, 11000);
 812
 813         ret = v4l2_ctrl_handler_setup(&sensor->ctrls);
 814         if (ret < 0)
 815                 goto error_entity;
 816
 817         /* SIZE */
 818         ret = mt9m032_update_geom_timing(sensor);
 819         if (ret < 0)
 820                 goto error_entity;
 821
 822         ret = mt9m032_write(client, 0x41, 0x0000);      /* reserved !!! */
 823         if (ret < 0)
 824                 goto error_entity;
 825         ret = mt9m032_write(client, 0x42, 0x0003);      /* reserved !!! */
 826         if (ret < 0)
 827                 goto error_entity;
 828         ret = mt9m032_write(client, 0x43, 0x0003);      /* reserved !!! */
 829         if (ret < 0)
 830                 goto error_entity;
 831         ret = mt9m032_write(client, 0x7f, 0x0000);      /* reserved !!! */
 832         if (ret < 0)
 833                 goto error_entity;
 834         if (sensor->pdata->invert_pixclock) {
 835                 ret = mt9m032_write(client, MT9M032_PIX_CLK_CTRL,
 836                                     MT9M032_PIX_CLK_CTRL_INV_PIXCLK);
 837                 if (ret < 0)
 838                         goto error_entity;
 839         }
 840
 841         ret = mt9m032_write(client, MT9M032_RESTART, 1); /* Restart on */
 842         if (ret < 0)
 843                 goto error_entity;
 844         msleep(100);
 845         ret = mt9m032_write(client, MT9M032_RESTART, 0); /* Restart off */
 846         if (ret < 0)
 847                 goto error_entity;
 848         msleep(100);
 849         ret = update_formatter2(sensor, false);
 850         if (ret < 0)
 851                 goto error_entity;
 852
 853         return ret;
 854
 855 error_entity:
 856         media_entity_cleanup(&sensor->subdev.entity);
 857 error_ctrl:
 858         v4l2_ctrl_handler_free(&sensor->ctrls);
 859 error_sensor:
 860         mutex_destroy(&sensor->lock);
 861         return ret;
 862 }
 863
 864 static int mt9m032_remove(struct i2c_client *client)
 865 {
 866         struct v4l2_subdev *subdev = i2c_get_clientdata(client);
 867         struct mt9m032 *sensor = to_mt9m032(subdev);
 868
 869         v4l2_device_unregister_subdev(subdev);
 870         v4l2_ctrl_handler_free(&sensor->ctrls);
 871         media_entity_cleanup(&subdev->entity);
 872         mutex_destroy(&sensor->lock);
 873         return 0;
 874 }
 875
 876 static const struct i2c_device_id mt9m032_id_table[] = {
 877         { MT9M032_NAME, 0 },
 878         { }
 879 };
 880
 881 MODULE_DEVICE_TABLE(i2c, mt9m032_id_table);
 882
 883 static struct i2c_driver mt9m032_i2c_driver = {
 884         .driver = {
 885                 .name = MT9M032_NAME,
 886         },
 887         .probe = mt9m032_probe,
 888         .remove = mt9m032_remove,
 889         .id_table = mt9m032_id_table,
 890 };
 891
 892 module_i2c_driver(mt9m032_i2c_driver);
 893
 894 MODULE_AUTHOR("Martin Hostettler <martin@neutronstar.dyndns.org>");
 895 MODULE_DESCRIPTION("MT9M032 camera sensor driver");
 896 MODULE_LICENSE("GPL v2");