drivers/media/video/mt9m001.c

   1 /*
   2  * Driver for MT9M001 CMOS Image Sensor from Micron
   3  *
   4  * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/videodev2.h>
  12 #include <linux/slab.h>
  13 #include <linux/i2c.h>
  14 #include <linux/log2.h>
  15 #include <linux/module.h>
  16
  17 #include <media/soc_camera.h>
  18 #include <media/soc_mediabus.h>
  19 #include <media/v4l2-subdev.h>
  20 #include <media/v4l2-chip-ident.h>
  21 #include <media/v4l2-ctrls.h>
  22
  23 /*
  24  * mt9m001 i2c address 0x5d
  25  * The platform has to define ctruct i2c_board_info objects and link to them
  26  * from struct soc_camera_link
  27  */
  28
  29 /* mt9m001 selected register addresses */
  30 #define MT9M001_CHIP_VERSION            0x00
  31 #define MT9M001_ROW_START               0x01
  32 #define MT9M001_COLUMN_START            0x02
  33 #define MT9M001_WINDOW_HEIGHT           0x03
  34 #define MT9M001_WINDOW_WIDTH            0x04
  35 #define MT9M001_HORIZONTAL_BLANKING     0x05
  36 #define MT9M001_VERTICAL_BLANKING       0x06
  37 #define MT9M001_OUTPUT_CONTROL          0x07
  38 #define MT9M001_SHUTTER_WIDTH           0x09
  39 #define MT9M001_FRAME_RESTART           0x0b
  40 #define MT9M001_SHUTTER_DELAY           0x0c
  41 #define MT9M001_RESET                   0x0d
  42 #define MT9M001_READ_OPTIONS1           0x1e
  43 #define MT9M001_READ_OPTIONS2           0x20
  44 #define MT9M001_GLOBAL_GAIN             0x35
  45 #define MT9M001_CHIP_ENABLE             0xF1
  46
  47 #define MT9M001_MAX_WIDTH               1280
  48 #define MT9M001_MAX_HEIGHT              1024
  49 #define MT9M001_MIN_WIDTH               48
  50 #define MT9M001_MIN_HEIGHT              32
  51 #define MT9M001_COLUMN_SKIP             20
  52 #define MT9M001_ROW_SKIP                12
  53
  54 /* MT9M001 has only one fixed colorspace per pixelcode */
  55 struct mt9m001_datafmt {
  56         enum v4l2_mbus_pixelcode        code;
  57         enum v4l2_colorspace            colorspace;
  58 };
  59
  60 /* Find a data format by a pixel code in an array */
  61 static const struct mt9m001_datafmt *mt9m001_find_datafmt(
  62         enum v4l2_mbus_pixelcode code, const struct mt9m001_datafmt *fmt,
  63         int n)
  64 {
  65         int i;
  66         for (i = 0; i < n; i++)
  67                 if (fmt[i].code == code)
  68                         return fmt + i;
  69
  70         return NULL;
  71 }
  72
  73 static const struct mt9m001_datafmt mt9m001_colour_fmts[] = {
  74         /*
  75          * Order important: first natively supported,
  76          * second supported with a GPIO extender
  77          */
  78         {V4L2_MBUS_FMT_SBGGR10_1X10, V4L2_COLORSPACE_SRGB},
  79         {V4L2_MBUS_FMT_SBGGR8_1X8, V4L2_COLORSPACE_SRGB},
  80 };
  81
  82 static const struct mt9m001_datafmt mt9m001_monochrome_fmts[] = {
  83         /* Order important - see above */
  84         {V4L2_MBUS_FMT_Y10_1X10, V4L2_COLORSPACE_JPEG},
  85         {V4L2_MBUS_FMT_Y8_1X8, V4L2_COLORSPACE_JPEG},
  86 };
  87
  88 struct mt9m001 {
  89         struct v4l2_subdev subdev;
  90         struct v4l2_ctrl_handler hdl;
  91         struct {
  92                 /* exposure/auto-exposure cluster */
  93                 struct v4l2_ctrl *autoexposure;
  94                 struct v4l2_ctrl *exposure;
  95         };
  96         struct v4l2_rect rect;  /* Sensor window */
  97         const struct mt9m001_datafmt *fmt;
  98         const struct mt9m001_datafmt *fmts;
  99         int num_fmts;
 100         int model;      /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
 101         unsigned int total_h;
 102         unsigned short y_skip_top;      /* Lines to skip at the top */
 103 };
 104
 105 static struct mt9m001 *to_mt9m001(const struct i2c_client *client)
 106 {
 107         return container_of(i2c_get_clientdata(client), struct mt9m001, subdev);
 108 }
 109
 110 static int reg_read(struct i2c_client *client, const u8 reg)
 111 {
 112         s32 data = i2c_smbus_read_word_data(client, reg);
 113         return data < 0 ? data : swab16(data);
 114 }
 115
 116 static int reg_write(struct i2c_client *client, const u8 reg,
 117                      const u16 data)
 118 {
 119         return i2c_smbus_write_word_data(client, reg, swab16(data));
 120 }
 121
 122 static int reg_set(struct i2c_client *client, const u8 reg,
 123                    const u16 data)
 124 {
 125         int ret;
 126
 127         ret = reg_read(client, reg);
 128         if (ret < 0)
 129                 return ret;
 130         return reg_write(client, reg, ret | data);
 131 }
 132
 133 static int reg_clear(struct i2c_client *client, const u8 reg,
 134                      const u16 data)
 135 {
 136         int ret;
 137
 138         ret = reg_read(client, reg);
 139         if (ret < 0)
 140                 return ret;
 141         return reg_write(client, reg, ret & ~data);
 142 }
 143
 144 static int mt9m001_init(struct i2c_client *client)
 145 {
 146         int ret;
 147
 148         dev_dbg(&client->dev, "%s\n", __func__);
 149
 150         /*
 151          * We don't know, whether platform provides reset, issue a soft reset
 152          * too. This returns all registers to their default values.
 153          */
 154         ret = reg_write(client, MT9M001_RESET, 1);
 155         if (!ret)
 156                 ret = reg_write(client, MT9M001_RESET, 0);
 157
 158         /* Disable chip, synchronous option update */
 159         if (!ret)
 160                 ret = reg_write(client, MT9M001_OUTPUT_CONTROL, 0);
 161
 162         return ret;
 163 }
 164
 165 static int mt9m001_s_stream(struct v4l2_subdev *sd, int enable)
 166 {
 167         struct i2c_client *client = v4l2_get_subdevdata(sd);
 168
 169         /* Switch to master "normal" mode or stop sensor readout */
 170         if (reg_write(client, MT9M001_OUTPUT_CONTROL, enable ? 2 : 0) < 0)
 171                 return -EIO;
 172         return 0;
 173 }
 174
 175 static int mt9m001_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
 176 {
 177         struct i2c_client *client = v4l2_get_subdevdata(sd);
 178         struct mt9m001 *mt9m001 = to_mt9m001(client);
 179         struct v4l2_rect rect = a->c;
 180         int ret;
 181         const u16 hblank = 9, vblank = 25;
 182
 183         if (mt9m001->fmts == mt9m001_colour_fmts)
 184                 /*
 185                  * Bayer format - even number of rows for simplicity,
 186                  * but let the user play with the top row.
 187                  */
 188                 rect.height = ALIGN(rect.height, 2);
 189
 190         /* Datasheet requirement: see register description */
 191         rect.width = ALIGN(rect.width, 2);
 192         rect.left = ALIGN(rect.left, 2);
 193
 194         soc_camera_limit_side(&rect.left, &rect.width,
 195                      MT9M001_COLUMN_SKIP, MT9M001_MIN_WIDTH, MT9M001_MAX_WIDTH);
 196
 197         soc_camera_limit_side(&rect.top, &rect.height,
 198                      MT9M001_ROW_SKIP, MT9M001_MIN_HEIGHT, MT9M001_MAX_HEIGHT);
 199
 200         mt9m001->total_h = rect.height + mt9m001->y_skip_top + vblank;
 201
 202         /* Blanking and start values - default... */
 203         ret = reg_write(client, MT9M001_HORIZONTAL_BLANKING, hblank);
 204         if (!ret)
 205                 ret = reg_write(client, MT9M001_VERTICAL_BLANKING, vblank);
 206
 207         /*
 208          * The caller provides a supported format, as verified per
 209          * call to .try_mbus_fmt()
 210          */
 211         if (!ret)
 212                 ret = reg_write(client, MT9M001_COLUMN_START, rect.left);
 213         if (!ret)
 214                 ret = reg_write(client, MT9M001_ROW_START, rect.top);
 215         if (!ret)
 216                 ret = reg_write(client, MT9M001_WINDOW_WIDTH, rect.width - 1);
 217         if (!ret)
 218                 ret = reg_write(client, MT9M001_WINDOW_HEIGHT,
 219                                 rect.height + mt9m001->y_skip_top - 1);
 220         if (!ret && v4l2_ctrl_g_ctrl(mt9m001->autoexposure) == V4L2_EXPOSURE_AUTO)
 221                 ret = reg_write(client, MT9M001_SHUTTER_WIDTH, mt9m001->total_h);
 222
 223         if (!ret)
 224                 mt9m001->rect = rect;
 225
 226         return ret;
 227 }
 228
 229 static int mt9m001_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
 230 {
 231         struct i2c_client *client = v4l2_get_subdevdata(sd);
 232         struct mt9m001 *mt9m001 = to_mt9m001(client);
 233
 234         a->c    = mt9m001->rect;
 235         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 236
 237         return 0;
 238 }
 239
 240 static int mt9m001_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
 241 {
 242         a->bounds.left                  = MT9M001_COLUMN_SKIP;
 243         a->bounds.top                   = MT9M001_ROW_SKIP;
 244         a->bounds.width                 = MT9M001_MAX_WIDTH;
 245         a->bounds.height                = MT9M001_MAX_HEIGHT;
 246         a->defrect                      = a->bounds;
 247         a->type                         = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 248         a->pixelaspect.numerator        = 1;
 249         a->pixelaspect.denominator      = 1;
 250
 251         return 0;
 252 }
 253
 254 static int mt9m001_g_fmt(struct v4l2_subdev *sd,
 255                          struct v4l2_mbus_framefmt *mf)
 256 {
 257         struct i2c_client *client = v4l2_get_subdevdata(sd);
 258         struct mt9m001 *mt9m001 = to_mt9m001(client);
 259
 260         mf->width       = mt9m001->rect.width;
 261         mf->height      = mt9m001->rect.height;
 262         mf->code        = mt9m001->fmt->code;
 263         mf->colorspace  = mt9m001->fmt->colorspace;
 264         mf->field       = V4L2_FIELD_NONE;
 265
 266         return 0;
 267 }
 268
 269 static int mt9m001_s_fmt(struct v4l2_subdev *sd,
 270                          struct v4l2_mbus_framefmt *mf)
 271 {
 272         struct i2c_client *client = v4l2_get_subdevdata(sd);
 273         struct mt9m001 *mt9m001 = to_mt9m001(client);
 274         struct v4l2_crop a = {
 275                 .c = {
 276                         .left   = mt9m001->rect.left,
 277                         .top    = mt9m001->rect.top,
 278                         .width  = mf->width,
 279                         .height = mf->height,
 280                 },
 281         };
 282         int ret;
 283
 284         /* No support for scaling so far, just crop. TODO: use skipping */
 285         ret = mt9m001_s_crop(sd, &a);
 286         if (!ret) {
 287                 mf->width       = mt9m001->rect.width;
 288                 mf->height      = mt9m001->rect.height;
 289                 mt9m001->fmt    = mt9m001_find_datafmt(mf->code,
 290                                         mt9m001->fmts, mt9m001->num_fmts);
 291                 mf->colorspace  = mt9m001->fmt->colorspace;
 292         }
 293
 294         return ret;
 295 }
 296
 297 static int mt9m001_try_fmt(struct v4l2_subdev *sd,
 298                            struct v4l2_mbus_framefmt *mf)
 299 {
 300         struct i2c_client *client = v4l2_get_subdevdata(sd);
 301         struct mt9m001 *mt9m001 = to_mt9m001(client);
 302         const struct mt9m001_datafmt *fmt;
 303
 304         v4l_bound_align_image(&mf->width, MT9M001_MIN_WIDTH,
 305                 MT9M001_MAX_WIDTH, 1,
 306                 &mf->height, MT9M001_MIN_HEIGHT + mt9m001->y_skip_top,
 307                 MT9M001_MAX_HEIGHT + mt9m001->y_skip_top, 0, 0);
 308
 309         if (mt9m001->fmts == mt9m001_colour_fmts)
 310                 mf->height = ALIGN(mf->height - 1, 2);
 311
 312         fmt = mt9m001_find_datafmt(mf->code, mt9m001->fmts,
 313                                    mt9m001->num_fmts);
 314         if (!fmt) {
 315                 fmt = mt9m001->fmt;
 316                 mf->code = fmt->code;
 317         }
 318
 319         mf->colorspace  = fmt->colorspace;
 320
 321         return 0;
 322 }
 323
 324 static int mt9m001_g_chip_ident(struct v4l2_subdev *sd,
 325                                 struct v4l2_dbg_chip_ident *id)
 326 {
 327         struct i2c_client *client = v4l2_get_subdevdata(sd);
 328         struct mt9m001 *mt9m001 = to_mt9m001(client);
 329
 330         if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
 331                 return -EINVAL;
 332
 333         if (id->match.addr != client->addr)
 334                 return -ENODEV;
 335
 336         id->ident       = mt9m001->model;
 337         id->revision    = 0;
 338
 339         return 0;
 340 }
 341
 342 #ifdef CONFIG_VIDEO_ADV_DEBUG
 343 static int mt9m001_g_register(struct v4l2_subdev *sd,
 344                               struct v4l2_dbg_register *reg)
 345 {
 346         struct i2c_client *client = v4l2_get_subdevdata(sd);
 347
 348         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 349                 return -EINVAL;
 350
 351         if (reg->match.addr != client->addr)
 352                 return -ENODEV;
 353
 354         reg->size = 2;
 355         reg->val = reg_read(client, reg->reg);
 356
 357         if (reg->val > 0xffff)
 358                 return -EIO;
 359
 360         return 0;
 361 }
 362
 363 static int mt9m001_s_register(struct v4l2_subdev *sd,
 364                               struct v4l2_dbg_register *reg)
 365 {
 366         struct i2c_client *client = v4l2_get_subdevdata(sd);
 367
 368         if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 369                 return -EINVAL;
 370
 371         if (reg->match.addr != client->addr)
 372                 return -ENODEV;
 373
 374         if (reg_write(client, reg->reg, reg->val) < 0)
 375                 return -EIO;
 376
 377         return 0;
 378 }
 379 #endif
 380
 381 static int mt9m001_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 382 {
 383         struct mt9m001 *mt9m001 = container_of(ctrl->handler,
 384                                                struct mt9m001, hdl);
 385         s32 min, max;
 386
 387         switch (ctrl->id) {
 388         case V4L2_CID_EXPOSURE_AUTO:
 389                 min = mt9m001->exposure->minimum;
 390                 max = mt9m001->exposure->maximum;
 391                 mt9m001->exposure->val =
 392                         (524 + (mt9m001->total_h - 1) * (max - min)) / 1048 + min;
 393                 break;
 394         }
 395         return 0;
 396 }
 397
 398 static int mt9m001_s_ctrl(struct v4l2_ctrl *ctrl)
 399 {
 400         struct mt9m001 *mt9m001 = container_of(ctrl->handler,
 401                                                struct mt9m001, hdl);
 402         struct v4l2_subdev *sd = &mt9m001->subdev;
 403         struct i2c_client *client = v4l2_get_subdevdata(sd);
 404         struct v4l2_ctrl *exp = mt9m001->exposure;
 405         int data;
 406
 407         switch (ctrl->id) {
 408         case V4L2_CID_VFLIP:
 409                 if (ctrl->val)
 410                         data = reg_set(client, MT9M001_READ_OPTIONS2, 0x8000);
 411                 else
 412                         data = reg_clear(client, MT9M001_READ_OPTIONS2, 0x8000);
 413                 if (data < 0)
 414                         return -EIO;
 415                 return 0;
 416
 417         case V4L2_CID_GAIN:
 418                 /* See Datasheet Table 7, Gain settings. */
 419                 if (ctrl->val <= ctrl->default_value) {
 420                         /* Pack it into 0..1 step 0.125, register values 0..8 */
 421                         unsigned long range = ctrl->default_value - ctrl->minimum;
 422                         data = ((ctrl->val - ctrl->minimum) * 8 + range / 2) / range;
 423
 424                         dev_dbg(&client->dev, "Setting gain %d\n", data);
 425                         data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
 426                         if (data < 0)
 427                                 return -EIO;
 428                 } else {
 429                         /* Pack it into 1.125..15 variable step, register values 9..67 */
 430                         /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
 431                         unsigned long range = ctrl->maximum - ctrl->default_value - 1;
 432                         unsigned long gain = ((ctrl->val - ctrl->default_value - 1) *
 433                                                111 + range / 2) / range + 9;
 434
 435                         if (gain <= 32)
 436                                 data = gain;
 437                         else if (gain <= 64)
 438                                 data = ((gain - 32) * 16 + 16) / 32 + 80;
 439                         else
 440                                 data = ((gain - 64) * 7 + 28) / 56 + 96;
 441
 442                         dev_dbg(&client->dev, "Setting gain from %d to %d\n",
 443                                  reg_read(client, MT9M001_GLOBAL_GAIN), data);
 444                         data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
 445                         if (data < 0)
 446                                 return -EIO;
 447                 }
 448                 return 0;
 449
 450         case V4L2_CID_EXPOSURE_AUTO:
 451                 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
 452                         unsigned long range = exp->maximum - exp->minimum;
 453                         unsigned long shutter = ((exp->val - exp->minimum) * 1048 +
 454                                                  range / 2) / range + 1;
 455
 456                         dev_dbg(&client->dev,
 457                                 "Setting shutter width from %d to %lu\n",
 458                                 reg_read(client, MT9M001_SHUTTER_WIDTH), shutter);
 459                         if (reg_write(client, MT9M001_SHUTTER_WIDTH, shutter) < 0)
 460                                 return -EIO;
 461                 } else {
 462                         const u16 vblank = 25;
 463
 464                         mt9m001->total_h = mt9m001->rect.height +
 465                                 mt9m001->y_skip_top + vblank;
 466                         if (reg_write(client, MT9M001_SHUTTER_WIDTH, mt9m001->total_h) < 0)
 467                                 return -EIO;
 468                 }
 469                 return 0;
 470         }
 471         return -EINVAL;
 472 }
 473
 474 /*
 475  * Interface active, can use i2c. If it fails, it can indeed mean, that
 476  * this wasn't our capture interface, so, we wait for the right one
 477  */
 478 static int mt9m001_video_probe(struct soc_camera_link *icl,
 479                                struct i2c_client *client)
 480 {
 481         struct mt9m001 *mt9m001 = to_mt9m001(client);
 482         s32 data;
 483         unsigned long flags;
 484         int ret;
 485
 486         /* Enable the chip */
 487         data = reg_write(client, MT9M001_CHIP_ENABLE, 1);
 488         dev_dbg(&client->dev, "write: %d\n", data);
 489
 490         /* Read out the chip version register */
 491         data = reg_read(client, MT9M001_CHIP_VERSION);
 492
 493         /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
 494         switch (data) {
 495         case 0x8411:
 496         case 0x8421:
 497                 mt9m001->model = V4L2_IDENT_MT9M001C12ST;
 498                 mt9m001->fmts = mt9m001_colour_fmts;
 499                 break;
 500         case 0x8431:
 501                 mt9m001->model = V4L2_IDENT_MT9M001C12STM;
 502                 mt9m001->fmts = mt9m001_monochrome_fmts;
 503                 break;
 504         default:
 505                 dev_err(&client->dev,
 506                         "No MT9M001 chip detected, register read %x\n", data);
 507                 return -ENODEV;
 508         }
 509
 510         mt9m001->num_fmts = 0;
 511
 512         /*
 513          * This is a 10bit sensor, so by default we only allow 10bit.
 514          * The platform may support different bus widths due to
 515          * different routing of the data lines.
 516          */
 517         if (icl->query_bus_param)
 518                 flags = icl->query_bus_param(icl);
 519         else
 520                 flags = SOCAM_DATAWIDTH_10;
 521
 522         if (flags & SOCAM_DATAWIDTH_10)
 523                 mt9m001->num_fmts++;
 524         else
 525                 mt9m001->fmts++;
 526
 527         if (flags & SOCAM_DATAWIDTH_8)
 528                 mt9m001->num_fmts++;
 529
 530         mt9m001->fmt = &mt9m001->fmts[0];
 531
 532         dev_info(&client->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
 533                  data == 0x8431 ? "C12STM" : "C12ST");
 534
 535         ret = mt9m001_init(client);
 536         if (ret < 0)
 537                 dev_err(&client->dev, "Failed to initialise the camera\n");
 538
 539         /* mt9m001_init() has reset the chip, returning registers to defaults */
 540         return v4l2_ctrl_handler_setup(&mt9m001->hdl);
 541 }
 542
 543 static void mt9m001_video_remove(struct soc_camera_link *icl)
 544 {
 545         if (icl->free_bus)
 546                 icl->free_bus(icl);
 547 }
 548
 549 static int mt9m001_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
 550 {
 551         struct i2c_client *client = v4l2_get_subdevdata(sd);
 552         struct mt9m001 *mt9m001 = to_mt9m001(client);
 553
 554         *lines = mt9m001->y_skip_top;
 555
 556         return 0;
 557 }
 558
 559 static const struct v4l2_ctrl_ops mt9m001_ctrl_ops = {
 560         .g_volatile_ctrl = mt9m001_g_volatile_ctrl,
 561         .s_ctrl = mt9m001_s_ctrl,
 562 };
 563
 564 static struct v4l2_subdev_core_ops mt9m001_subdev_core_ops = {
 565         .g_chip_ident   = mt9m001_g_chip_ident,
 566 #ifdef CONFIG_VIDEO_ADV_DEBUG
 567         .g_register     = mt9m001_g_register,
 568         .s_register     = mt9m001_s_register,
 569 #endif
 570 };
 571
 572 static int mt9m001_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
 573                             enum v4l2_mbus_pixelcode *code)
 574 {
 575         struct i2c_client *client = v4l2_get_subdevdata(sd);
 576         struct mt9m001 *mt9m001 = to_mt9m001(client);
 577
 578         if (index >= mt9m001->num_fmts)
 579                 return -EINVAL;
 580
 581         *code = mt9m001->fmts[index].code;
 582         return 0;
 583 }
 584
 585 static int mt9m001_g_mbus_config(struct v4l2_subdev *sd,
 586                                 struct v4l2_mbus_config *cfg)
 587 {
 588         struct i2c_client *client = v4l2_get_subdevdata(sd);
 589         struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 590
 591         /* MT9M001 has all capture_format parameters fixed */
 592         cfg->flags = V4L2_MBUS_PCLK_SAMPLE_FALLING |
 593                 V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH |
 594                 V4L2_MBUS_DATA_ACTIVE_HIGH | V4L2_MBUS_MASTER;
 595         cfg->type = V4L2_MBUS_PARALLEL;
 596         cfg->flags = soc_camera_apply_board_flags(icl, cfg);
 597
 598         return 0;
 599 }
 600
 601 static int mt9m001_s_mbus_config(struct v4l2_subdev *sd,
 602                                 const struct v4l2_mbus_config *cfg)
 603 {
 604         const struct i2c_client *client = v4l2_get_subdevdata(sd);
 605         struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 606         struct mt9m001 *mt9m001 = to_mt9m001(client);
 607         unsigned int bps = soc_mbus_get_fmtdesc(mt9m001->fmt->code)->bits_per_sample;
 608
 609         if (icl->set_bus_param)
 610                 return icl->set_bus_param(icl, 1 << (bps - 1));
 611
 612         /*
 613          * Without board specific bus width settings we only support the
 614          * sensors native bus width
 615          */
 616         return bps == 10 ? 0 : -EINVAL;
 617 }
 618
 619 static struct v4l2_subdev_video_ops mt9m001_subdev_video_ops = {
 620         .s_stream       = mt9m001_s_stream,
 621         .s_mbus_fmt     = mt9m001_s_fmt,
 622         .g_mbus_fmt     = mt9m001_g_fmt,
 623         .try_mbus_fmt   = mt9m001_try_fmt,
 624         .s_crop         = mt9m001_s_crop,
 625         .g_crop         = mt9m001_g_crop,
 626         .cropcap        = mt9m001_cropcap,
 627         .enum_mbus_fmt  = mt9m001_enum_fmt,
 628         .g_mbus_config  = mt9m001_g_mbus_config,
 629         .s_mbus_config  = mt9m001_s_mbus_config,
 630 };
 631
 632 static struct v4l2_subdev_sensor_ops mt9m001_subdev_sensor_ops = {
 633         .g_skip_top_lines       = mt9m001_g_skip_top_lines,
 634 };
 635
 636 static struct v4l2_subdev_ops mt9m001_subdev_ops = {
 637         .core   = &mt9m001_subdev_core_ops,
 638         .video  = &mt9m001_subdev_video_ops,
 639         .sensor = &mt9m001_subdev_sensor_ops,
 640 };
 641
 642 static int mt9m001_probe(struct i2c_client *client,
 643                          const struct i2c_device_id *did)
 644 {
 645         struct mt9m001 *mt9m001;
 646         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 647         struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 648         int ret;
 649
 650         if (!icl) {
 651                 dev_err(&client->dev, "MT9M001 driver needs platform data\n");
 652                 return -EINVAL;
 653         }
 654
 655         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
 656                 dev_warn(&adapter->dev,
 657                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
 658                 return -EIO;
 659         }
 660
 661         mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL);
 662         if (!mt9m001)
 663                 return -ENOMEM;
 664
 665         v4l2_i2c_subdev_init(&mt9m001->subdev, client, &mt9m001_subdev_ops);
 666         v4l2_ctrl_handler_init(&mt9m001->hdl, 4);
 667         v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
 668                         V4L2_CID_VFLIP, 0, 1, 1, 0);
 669         v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
 670                         V4L2_CID_GAIN, 0, 127, 1, 64);
 671         mt9m001->exposure = v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
 672                         V4L2_CID_EXPOSURE, 1, 255, 1, 255);
 673         /*
 674          * Simulated autoexposure. If enabled, we calculate shutter width
 675          * ourselves in the driver based on vertical blanking and frame width
 676          */
 677         mt9m001->autoexposure = v4l2_ctrl_new_std_menu(&mt9m001->hdl,
 678                         &mt9m001_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
 679                         V4L2_EXPOSURE_AUTO);
 680         mt9m001->subdev.ctrl_handler = &mt9m001->hdl;
 681         if (mt9m001->hdl.error) {
 682                 int err = mt9m001->hdl.error;
 683
 684                 kfree(mt9m001);
 685                 return err;
 686         }
 687         v4l2_ctrl_auto_cluster(2, &mt9m001->autoexposure,
 688                                         V4L2_EXPOSURE_MANUAL, true);
 689
 690         /* Second stage probe - when a capture adapter is there */
 691         mt9m001->y_skip_top     = 0;
 692         mt9m001->rect.left      = MT9M001_COLUMN_SKIP;
 693         mt9m001->rect.top       = MT9M001_ROW_SKIP;
 694         mt9m001->rect.width     = MT9M001_MAX_WIDTH;
 695         mt9m001->rect.height    = MT9M001_MAX_HEIGHT;
 696
 697         ret = mt9m001_video_probe(icl, client);
 698         if (ret) {
 699                 v4l2_ctrl_handler_free(&mt9m001->hdl);
 700                 kfree(mt9m001);
 701         }
 702
 703         return ret;
 704 }
 705
 706 static int mt9m001_remove(struct i2c_client *client)
 707 {
 708         struct mt9m001 *mt9m001 = to_mt9m001(client);
 709         struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 710
 711         v4l2_device_unregister_subdev(&mt9m001->subdev);
 712         v4l2_ctrl_handler_free(&mt9m001->hdl);
 713         mt9m001_video_remove(icl);
 714         kfree(mt9m001);
 715
 716         return 0;
 717 }
 718
 719 static const struct i2c_device_id mt9m001_id[] = {
 720         { "mt9m001", 0 },
 721         { }
 722 };
 723 MODULE_DEVICE_TABLE(i2c, mt9m001_id);
 724
 725 static struct i2c_driver mt9m001_i2c_driver = {
 726         .driver = {
 727                 .name = "mt9m001",
 728         },
 729         .probe          = mt9m001_probe,
 730         .remove         = mt9m001_remove,
 731         .id_table       = mt9m001_id,
 732 };
 733
 734 static int __init mt9m001_mod_init(void)
 735 {
 736         return i2c_add_driver(&mt9m001_i2c_driver);
 737 }
 738
 739 static void __exit mt9m001_mod_exit(void)
 740 {
 741         i2c_del_driver(&mt9m001_i2c_driver);
 742 }
 743
 744 module_init(mt9m001_mod_init);
 745 module_exit(mt9m001_mod_exit);
 746
 747 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
 748 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
 749 MODULE_LICENSE("GPL");