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/gpio.h>
  16
  17 #include <media/v4l2-common.h>
  18 #include <media/v4l2-chip-ident.h>
  19 #include <media/soc_camera.h>
  20
  21 /* mt9m001 i2c address 0x5d
  22  * The platform has to define i2c_board_info
  23  * and call i2c_register_board_info() */
  24
  25 /* mt9m001 selected register addresses */
  26 #define MT9M001_CHIP_VERSION            0x00
  27 #define MT9M001_ROW_START               0x01
  28 #define MT9M001_COLUMN_START            0x02
  29 #define MT9M001_WINDOW_HEIGHT           0x03
  30 #define MT9M001_WINDOW_WIDTH            0x04
  31 #define MT9M001_HORIZONTAL_BLANKING     0x05
  32 #define MT9M001_VERTICAL_BLANKING       0x06
  33 #define MT9M001_OUTPUT_CONTROL          0x07
  34 #define MT9M001_SHUTTER_WIDTH           0x09
  35 #define MT9M001_FRAME_RESTART           0x0b
  36 #define MT9M001_SHUTTER_DELAY           0x0c
  37 #define MT9M001_RESET                   0x0d
  38 #define MT9M001_READ_OPTIONS1           0x1e
  39 #define MT9M001_READ_OPTIONS2           0x20
  40 #define MT9M001_GLOBAL_GAIN             0x35
  41 #define MT9M001_CHIP_ENABLE             0xF1
  42
  43 static const struct soc_camera_data_format mt9m001_colour_formats[] = {
  44         /* Order important: first natively supported,
  45          * second supported with a GPIO extender */
  46         {
  47                 .name           = "Bayer (sRGB) 10 bit",
  48                 .depth          = 10,
  49                 .fourcc         = V4L2_PIX_FMT_SBGGR16,
  50                 .colorspace     = V4L2_COLORSPACE_SRGB,
  51         }, {
  52                 .name           = "Bayer (sRGB) 8 bit",
  53                 .depth          = 8,
  54                 .fourcc         = V4L2_PIX_FMT_SBGGR8,
  55                 .colorspace     = V4L2_COLORSPACE_SRGB,
  56         }
  57 };
  58
  59 static const struct soc_camera_data_format mt9m001_monochrome_formats[] = {
  60         /* Order important - see above */
  61         {
  62                 .name           = "Monochrome 10 bit",
  63                 .depth          = 10,
  64                 .fourcc         = V4L2_PIX_FMT_Y16,
  65         }, {
  66                 .name           = "Monochrome 8 bit",
  67                 .depth          = 8,
  68                 .fourcc         = V4L2_PIX_FMT_GREY,
  69         },
  70 };
  71
  72 struct mt9m001 {
  73         struct i2c_client *client;
  74         struct soc_camera_device icd;
  75         int model;      /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
  76         int switch_gpio;
  77         unsigned char autoexposure;
  78         unsigned char datawidth;
  79 };
  80
  81 static int reg_read(struct soc_camera_device *icd, const u8 reg)
  82 {
  83         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
  84         struct i2c_client *client = mt9m001->client;
  85         s32 data = i2c_smbus_read_word_data(client, reg);
  86         return data < 0 ? data : swab16(data);
  87 }
  88
  89 static int reg_write(struct soc_camera_device *icd, const u8 reg,
  90                      const u16 data)
  91 {
  92         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
  93         return i2c_smbus_write_word_data(mt9m001->client, reg, swab16(data));
  94 }
  95
  96 static int reg_set(struct soc_camera_device *icd, const u8 reg,
  97                    const u16 data)
  98 {
  99         int ret;
 100
 101         ret = reg_read(icd, reg);
 102         if (ret < 0)
 103                 return ret;
 104         return reg_write(icd, reg, ret | data);
 105 }
 106
 107 static int reg_clear(struct soc_camera_device *icd, const u8 reg,
 108                      const u16 data)
 109 {
 110         int ret;
 111
 112         ret = reg_read(icd, reg);
 113         if (ret < 0)
 114                 return ret;
 115         return reg_write(icd, reg, ret & ~data);
 116 }
 117
 118 static int mt9m001_init(struct soc_camera_device *icd)
 119 {
 120         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 121         struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
 122         int ret;
 123
 124         dev_dbg(icd->vdev->parent, "%s\n", __func__);
 125
 126         if (icl->power) {
 127                 ret = icl->power(&mt9m001->client->dev, 1);
 128                 if (ret < 0) {
 129                         dev_err(icd->vdev->parent,
 130                                 "Platform failed to power-on the camera.\n");
 131                         return ret;
 132                 }
 133         }
 134
 135         /* The camera could have been already on, we reset it additionally */
 136         if (icl->reset)
 137                 ret = icl->reset(&mt9m001->client->dev);
 138         else
 139                 ret = -ENODEV;
 140
 141         if (ret < 0) {
 142                 /* Either no platform reset, or platform reset failed */
 143                 ret = reg_write(icd, MT9M001_RESET, 1);
 144                 if (!ret)
 145                         ret = reg_write(icd, MT9M001_RESET, 0);
 146         }
 147         /* Disable chip, synchronous option update */
 148         if (!ret)
 149                 ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
 150
 151         return ret;
 152 }
 153
 154 static int mt9m001_release(struct soc_camera_device *icd)
 155 {
 156         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 157         struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
 158
 159         /* Disable the chip */
 160         reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
 161
 162         if (icl->power)
 163                 icl->power(&mt9m001->client->dev, 0);
 164
 165         return 0;
 166 }
 167
 168 static int mt9m001_start_capture(struct soc_camera_device *icd)
 169 {
 170         /* Switch to master "normal" mode */
 171         if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0)
 172                 return -EIO;
 173         return 0;
 174 }
 175
 176 static int mt9m001_stop_capture(struct soc_camera_device *icd)
 177 {
 178         /* Stop sensor readout */
 179         if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0)
 180                 return -EIO;
 181         return 0;
 182 }
 183
 184 static int bus_switch_request(struct mt9m001 *mt9m001,
 185                               struct soc_camera_link *icl)
 186 {
 187 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
 188         int ret;
 189         unsigned int gpio = icl->gpio;
 190
 191         if (gpio_is_valid(gpio)) {
 192                 /* We have a data bus switch. */
 193                 ret = gpio_request(gpio, "mt9m001");
 194                 if (ret < 0) {
 195                         dev_err(&mt9m001->client->dev, "Cannot get GPIO %u\n",
 196                                 gpio);
 197                         return ret;
 198                 }
 199
 200                 ret = gpio_direction_output(gpio, 0);
 201                 if (ret < 0) {
 202                         dev_err(&mt9m001->client->dev,
 203                                 "Cannot set GPIO %u to output\n", gpio);
 204                         gpio_free(gpio);
 205                         return ret;
 206                 }
 207         }
 208
 209         mt9m001->switch_gpio = gpio;
 210 #else
 211         mt9m001->switch_gpio = -EINVAL;
 212 #endif
 213         return 0;
 214 }
 215
 216 static void bus_switch_release(struct mt9m001 *mt9m001)
 217 {
 218 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
 219         if (gpio_is_valid(mt9m001->switch_gpio))
 220                 gpio_free(mt9m001->switch_gpio);
 221 #endif
 222 }
 223
 224 static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit)
 225 {
 226 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
 227         if (!gpio_is_valid(mt9m001->switch_gpio))
 228                 return -ENODEV;
 229
 230         gpio_set_value_cansleep(mt9m001->switch_gpio, go8bit);
 231         return 0;
 232 #else
 233         return -ENODEV;
 234 #endif
 235 }
 236
 237 static int bus_switch_possible(struct mt9m001 *mt9m001)
 238 {
 239 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
 240         return gpio_is_valid(mt9m001->switch_gpio);
 241 #else
 242         return 0;
 243 #endif
 244 }
 245
 246 static int mt9m001_set_bus_param(struct soc_camera_device *icd,
 247                                  unsigned long flags)
 248 {
 249         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 250         unsigned int width_flag = flags & SOCAM_DATAWIDTH_MASK;
 251         int ret;
 252
 253         /* Flags validity verified in test_bus_param */
 254
 255         if ((mt9m001->datawidth != 10 && (width_flag == SOCAM_DATAWIDTH_10)) ||
 256             (mt9m001->datawidth != 9  && (width_flag == SOCAM_DATAWIDTH_9)) ||
 257             (mt9m001->datawidth != 8  && (width_flag == SOCAM_DATAWIDTH_8))) {
 258                 /* Well, we actually only can do 10 or 8 bits... */
 259                 if (width_flag == SOCAM_DATAWIDTH_9)
 260                         return -EINVAL;
 261                 ret = bus_switch_act(mt9m001,
 262                                      width_flag == SOCAM_DATAWIDTH_8);
 263                 if (ret < 0)
 264                         return ret;
 265
 266                 mt9m001->datawidth = width_flag == SOCAM_DATAWIDTH_8 ? 8 : 10;
 267         }
 268
 269         return 0;
 270 }
 271
 272 static unsigned long mt9m001_query_bus_param(struct soc_camera_device *icd)
 273 {
 274         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 275         unsigned int width_flag = SOCAM_DATAWIDTH_10;
 276
 277         if (bus_switch_possible(mt9m001))
 278                 width_flag |= SOCAM_DATAWIDTH_8;
 279
 280         /* MT9M001 has all capture_format parameters fixed */
 281         return SOCAM_PCLK_SAMPLE_RISING |
 282                 SOCAM_HSYNC_ACTIVE_HIGH |
 283                 SOCAM_VSYNC_ACTIVE_HIGH |
 284                 SOCAM_MASTER |
 285                 width_flag;
 286 }
 287
 288 static int mt9m001_set_fmt(struct soc_camera_device *icd,
 289                            __u32 pixfmt, struct v4l2_rect *rect)
 290 {
 291         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 292         int ret;
 293         const u16 hblank = 9, vblank = 25;
 294
 295         /* Blanking and start values - default... */
 296         ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank);
 297         if (!ret)
 298                 ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank);
 299
 300         /* The caller provides a supported format, as verified per
 301          * call to icd->try_fmt() */
 302         if (!ret)
 303                 ret = reg_write(icd, MT9M001_COLUMN_START, rect->left);
 304         if (!ret)
 305                 ret = reg_write(icd, MT9M001_ROW_START, rect->top);
 306         if (!ret)
 307                 ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1);
 308         if (!ret)
 309                 ret = reg_write(icd, MT9M001_WINDOW_HEIGHT,
 310                                 rect->height + icd->y_skip_top - 1);
 311         if (!ret && mt9m001->autoexposure) {
 312                 ret = reg_write(icd, MT9M001_SHUTTER_WIDTH,
 313                                 rect->height + icd->y_skip_top + vblank);
 314                 if (!ret) {
 315                         const struct v4l2_queryctrl *qctrl =
 316                                 soc_camera_find_qctrl(icd->ops,
 317                                                       V4L2_CID_EXPOSURE);
 318                         icd->exposure = (524 + (rect->height + icd->y_skip_top +
 319                                                 vblank - 1) *
 320                                          (qctrl->maximum - qctrl->minimum)) /
 321                                 1048 + qctrl->minimum;
 322                 }
 323         }
 324
 325         return ret;
 326 }
 327
 328 static int mt9m001_try_fmt(struct soc_camera_device *icd,
 329                            struct v4l2_format *f)
 330 {
 331         if (f->fmt.pix.height < 32 + icd->y_skip_top)
 332                 f->fmt.pix.height = 32 + icd->y_skip_top;
 333         if (f->fmt.pix.height > 1024 + icd->y_skip_top)
 334                 f->fmt.pix.height = 1024 + icd->y_skip_top;
 335         if (f->fmt.pix.width < 48)
 336                 f->fmt.pix.width = 48;
 337         if (f->fmt.pix.width > 1280)
 338                 f->fmt.pix.width = 1280;
 339         f->fmt.pix.width &= ~0x01; /* has to be even, unsure why was ~3 */
 340
 341         return 0;
 342 }
 343
 344 static int mt9m001_get_chip_id(struct soc_camera_device *icd,
 345                                struct v4l2_chip_ident *id)
 346 {
 347         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 348
 349         if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR)
 350                 return -EINVAL;
 351
 352         if (id->match_chip != mt9m001->client->addr)
 353                 return -ENODEV;
 354
 355         id->ident       = mt9m001->model;
 356         id->revision    = 0;
 357
 358         return 0;
 359 }
 360
 361 #ifdef CONFIG_VIDEO_ADV_DEBUG
 362 static int mt9m001_get_register(struct soc_camera_device *icd,
 363                                 struct v4l2_register *reg)
 364 {
 365         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 366
 367         if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 368                 return -EINVAL;
 369
 370         if (reg->match_chip != mt9m001->client->addr)
 371                 return -ENODEV;
 372
 373         reg->val = reg_read(icd, reg->reg);
 374
 375         if (reg->val > 0xffff)
 376                 return -EIO;
 377
 378         return 0;
 379 }
 380
 381 static int mt9m001_set_register(struct soc_camera_device *icd,
 382                                 struct v4l2_register *reg)
 383 {
 384         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 385
 386         if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 387                 return -EINVAL;
 388
 389         if (reg->match_chip != mt9m001->client->addr)
 390                 return -ENODEV;
 391
 392         if (reg_write(icd, reg->reg, reg->val) < 0)
 393                 return -EIO;
 394
 395         return 0;
 396 }
 397 #endif
 398
 399 static const struct v4l2_queryctrl mt9m001_controls[] = {
 400         {
 401                 .id             = V4L2_CID_VFLIP,
 402                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
 403                 .name           = "Flip Vertically",
 404                 .minimum        = 0,
 405                 .maximum        = 1,
 406                 .step           = 1,
 407                 .default_value  = 0,
 408         }, {
 409                 .id             = V4L2_CID_GAIN,
 410                 .type           = V4L2_CTRL_TYPE_INTEGER,
 411                 .name           = "Gain",
 412                 .minimum        = 0,
 413                 .maximum        = 127,
 414                 .step           = 1,
 415                 .default_value  = 64,
 416                 .flags          = V4L2_CTRL_FLAG_SLIDER,
 417         }, {
 418                 .id             = V4L2_CID_EXPOSURE,
 419                 .type           = V4L2_CTRL_TYPE_INTEGER,
 420                 .name           = "Exposure",
 421                 .minimum        = 1,
 422                 .maximum        = 255,
 423                 .step           = 1,
 424                 .default_value  = 255,
 425                 .flags          = V4L2_CTRL_FLAG_SLIDER,
 426         }, {
 427                 .id             = V4L2_CID_EXPOSURE_AUTO,
 428                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
 429                 .name           = "Automatic Exposure",
 430                 .minimum        = 0,
 431                 .maximum        = 1,
 432                 .step           = 1,
 433                 .default_value  = 1,
 434         }
 435 };
 436
 437 static int mt9m001_video_probe(struct soc_camera_device *);
 438 static void mt9m001_video_remove(struct soc_camera_device *);
 439 static int mt9m001_get_control(struct soc_camera_device *, struct v4l2_control *);
 440 static int mt9m001_set_control(struct soc_camera_device *, struct v4l2_control *);
 441
 442 static struct soc_camera_ops mt9m001_ops = {
 443         .owner                  = THIS_MODULE,
 444         .probe                  = mt9m001_video_probe,
 445         .remove                 = mt9m001_video_remove,
 446         .init                   = mt9m001_init,
 447         .release                = mt9m001_release,
 448         .start_capture          = mt9m001_start_capture,
 449         .stop_capture           = mt9m001_stop_capture,
 450         .set_fmt                = mt9m001_set_fmt,
 451         .try_fmt                = mt9m001_try_fmt,
 452         .set_bus_param          = mt9m001_set_bus_param,
 453         .query_bus_param        = mt9m001_query_bus_param,
 454         .controls               = mt9m001_controls,
 455         .num_controls           = ARRAY_SIZE(mt9m001_controls),
 456         .get_control            = mt9m001_get_control,
 457         .set_control            = mt9m001_set_control,
 458         .get_chip_id            = mt9m001_get_chip_id,
 459 #ifdef CONFIG_VIDEO_ADV_DEBUG
 460         .get_register           = mt9m001_get_register,
 461         .set_register           = mt9m001_set_register,
 462 #endif
 463 };
 464
 465 static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
 466 {
 467         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 468         int data;
 469
 470         switch (ctrl->id) {
 471         case V4L2_CID_VFLIP:
 472                 data = reg_read(icd, MT9M001_READ_OPTIONS2);
 473                 if (data < 0)
 474                         return -EIO;
 475                 ctrl->value = !!(data & 0x8000);
 476                 break;
 477         case V4L2_CID_EXPOSURE_AUTO:
 478                 ctrl->value = mt9m001->autoexposure;
 479                 break;
 480         }
 481         return 0;
 482 }
 483
 484 static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
 485 {
 486         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 487         const struct v4l2_queryctrl *qctrl;
 488         int data;
 489
 490         qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id);
 491
 492         if (!qctrl)
 493                 return -EINVAL;
 494
 495         switch (ctrl->id) {
 496         case V4L2_CID_VFLIP:
 497                 if (ctrl->value)
 498                         data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000);
 499                 else
 500                         data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000);
 501                 if (data < 0)
 502                         return -EIO;
 503                 break;
 504         case V4L2_CID_GAIN:
 505                 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
 506                         return -EINVAL;
 507                 /* See Datasheet Table 7, Gain settings. */
 508                 if (ctrl->value <= qctrl->default_value) {
 509                         /* Pack it into 0..1 step 0.125, register values 0..8 */
 510                         unsigned long range = qctrl->default_value - qctrl->minimum;
 511                         data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
 512
 513                         dev_dbg(&icd->dev, "Setting gain %d\n", data);
 514                         data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
 515                         if (data < 0)
 516                                 return -EIO;
 517                 } else {
 518                         /* Pack it into 1.125..15 variable step, register values 9..67 */
 519                         /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
 520                         unsigned long range = qctrl->maximum - qctrl->default_value - 1;
 521                         unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
 522                                                111 + range / 2) / range + 9;
 523
 524                         if (gain <= 32)
 525                                 data = gain;
 526                         else if (gain <= 64)
 527                                 data = ((gain - 32) * 16 + 16) / 32 + 80;
 528                         else
 529                                 data = ((gain - 64) * 7 + 28) / 56 + 96;
 530
 531                         dev_dbg(&icd->dev, "Setting gain from %d to %d\n",
 532                                  reg_read(icd, MT9M001_GLOBAL_GAIN), data);
 533                         data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
 534                         if (data < 0)
 535                                 return -EIO;
 536                 }
 537
 538                 /* Success */
 539                 icd->gain = ctrl->value;
 540                 break;
 541         case V4L2_CID_EXPOSURE:
 542                 /* mt9m001 has maximum == default */
 543                 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
 544                         return -EINVAL;
 545                 else {
 546                         unsigned long range = qctrl->maximum - qctrl->minimum;
 547                         unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 +
 548                                                  range / 2) / range + 1;
 549
 550                         dev_dbg(&icd->dev, "Setting shutter width from %d to %lu\n",
 551                                  reg_read(icd, MT9M001_SHUTTER_WIDTH), shutter);
 552                         if (reg_write(icd, MT9M001_SHUTTER_WIDTH, shutter) < 0)
 553                                 return -EIO;
 554                         icd->exposure = ctrl->value;
 555                         mt9m001->autoexposure = 0;
 556                 }
 557                 break;
 558         case V4L2_CID_EXPOSURE_AUTO:
 559                 if (ctrl->value) {
 560                         const u16 vblank = 25;
 561                         if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height +
 562                                       icd->y_skip_top + vblank) < 0)
 563                                 return -EIO;
 564                         qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
 565                         icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) *
 566                                          (qctrl->maximum - qctrl->minimum)) /
 567                                 1048 + qctrl->minimum;
 568                         mt9m001->autoexposure = 1;
 569                 } else
 570                         mt9m001->autoexposure = 0;
 571                 break;
 572         }
 573         return 0;
 574 }
 575
 576 /* Interface active, can use i2c. If it fails, it can indeed mean, that
 577  * this wasn't our capture interface, so, we wait for the right one */
 578 static int mt9m001_video_probe(struct soc_camera_device *icd)
 579 {
 580         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 581         s32 data;
 582         int ret;
 583
 584         /* We must have a parent by now. And it cannot be a wrong one.
 585          * So this entire test is completely redundant. */
 586         if (!icd->dev.parent ||
 587             to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
 588                 return -ENODEV;
 589
 590         /* Enable the chip */
 591         data = reg_write(&mt9m001->icd, MT9M001_CHIP_ENABLE, 1);
 592         dev_dbg(&icd->dev, "write: %d\n", data);
 593
 594         /* Read out the chip version register */
 595         data = reg_read(icd, MT9M001_CHIP_VERSION);
 596
 597         /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
 598         switch (data) {
 599         case 0x8411:
 600         case 0x8421:
 601                 mt9m001->model = V4L2_IDENT_MT9M001C12ST;
 602                 icd->formats = mt9m001_colour_formats;
 603                 if (mt9m001->client->dev.platform_data)
 604                         icd->num_formats = ARRAY_SIZE(mt9m001_colour_formats);
 605                 else
 606                         icd->num_formats = 1;
 607                 break;
 608         case 0x8431:
 609                 mt9m001->model = V4L2_IDENT_MT9M001C12STM;
 610                 icd->formats = mt9m001_monochrome_formats;
 611                 if (mt9m001->client->dev.platform_data)
 612                         icd->num_formats = ARRAY_SIZE(mt9m001_monochrome_formats);
 613                 else
 614                         icd->num_formats = 1;
 615                 break;
 616         default:
 617                 ret = -ENODEV;
 618                 dev_err(&icd->dev,
 619                         "No MT9M001 chip detected, register read %x\n", data);
 620                 goto ei2c;
 621         }
 622
 623         dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
 624                  data == 0x8431 ? "C12STM" : "C12ST");
 625
 626         /* Now that we know the model, we can start video */
 627         ret = soc_camera_video_start(icd);
 628         if (ret)
 629                 goto eisis;
 630
 631         return 0;
 632
 633 eisis:
 634 ei2c:
 635         return ret;
 636 }
 637
 638 static void mt9m001_video_remove(struct soc_camera_device *icd)
 639 {
 640         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 641
 642         dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr,
 643                 mt9m001->icd.dev.parent, mt9m001->icd.vdev);
 644         soc_camera_video_stop(&mt9m001->icd);
 645 }
 646
 647 static int mt9m001_probe(struct i2c_client *client,
 648                          const struct i2c_device_id *did)
 649 {
 650         struct mt9m001 *mt9m001;
 651         struct soc_camera_device *icd;
 652         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 653         struct soc_camera_link *icl = client->dev.platform_data;
 654         int ret;
 655
 656         if (!icl) {
 657                 dev_err(&client->dev, "MT9M001 driver needs platform data\n");
 658                 return -EINVAL;
 659         }
 660
 661         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
 662                 dev_warn(&adapter->dev,
 663                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
 664                 return -EIO;
 665         }
 666
 667         mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL);
 668         if (!mt9m001)
 669                 return -ENOMEM;
 670
 671         mt9m001->client = client;
 672         i2c_set_clientdata(client, mt9m001);
 673
 674         /* Second stage probe - when a capture adapter is there */
 675         icd = &mt9m001->icd;
 676         icd->ops        = &mt9m001_ops;
 677         icd->control    = &client->dev;
 678         icd->x_min      = 20;
 679         icd->y_min      = 12;
 680         icd->x_current  = 20;
 681         icd->y_current  = 12;
 682         icd->width_min  = 48;
 683         icd->width_max  = 1280;
 684         icd->height_min = 32;
 685         icd->height_max = 1024;
 686         icd->y_skip_top = 1;
 687         icd->iface      = icl->bus_id;
 688         /* Default datawidth - this is the only width this camera (normally)
 689          * supports. It is only with extra logic that it can support
 690          * other widths. Therefore it seems to be a sensible default. */
 691         mt9m001->datawidth = 10;
 692         /* Simulated autoexposure. If enabled, we calculate shutter width
 693          * ourselves in the driver based on vertical blanking and frame width */
 694         mt9m001->autoexposure = 1;
 695
 696         ret = bus_switch_request(mt9m001, icl);
 697         if (ret)
 698                 goto eswinit;
 699
 700         ret = soc_camera_device_register(icd);
 701         if (ret)
 702                 goto eisdr;
 703
 704         return 0;
 705
 706 eisdr:
 707         bus_switch_release(mt9m001);
 708 eswinit:
 709         kfree(mt9m001);
 710         return ret;
 711 }
 712
 713 static int mt9m001_remove(struct i2c_client *client)
 714 {
 715         struct mt9m001 *mt9m001 = i2c_get_clientdata(client);
 716
 717         soc_camera_device_unregister(&mt9m001->icd);
 718         bus_switch_release(mt9m001);
 719         kfree(mt9m001);
 720
 721         return 0;
 722 }
 723
 724 static const struct i2c_device_id mt9m001_id[] = {
 725         { "mt9m001", 0 },
 726         { }
 727 };
 728 MODULE_DEVICE_TABLE(i2c, mt9m001_id);
 729
 730 static struct i2c_driver mt9m001_i2c_driver = {
 731         .driver = {
 732                 .name = "mt9m001",
 733         },
 734         .probe          = mt9m001_probe,
 735         .remove         = mt9m001_remove,
 736         .id_table       = mt9m001_id,
 737 };
 738
 739 static int __init mt9m001_mod_init(void)
 740 {
 741         return i2c_add_driver(&mt9m001_i2c_driver);
 742 }
 743
 744 static void __exit mt9m001_mod_exit(void)
 745 {
 746         i2c_del_driver(&mt9m001_i2c_driver);
 747 }
 748
 749 module_init(mt9m001_mod_init);
 750 module_exit(mt9m001_mod_exit);
 751
 752 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
 753 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
 754 MODULE_LICENSE("GPL");