drivers/media/i2c/soc_camera/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/drv-intf/soc_mediabus.h>
  19 #include <media/v4l2-clk.h>
  20 #include <media/v4l2-subdev.h>
  21 #include <media/v4l2-ctrls.h>
  22
  23 /*
  24  * mt9m001 i2c address 0x5d
  25  * The platform has to define struct i2c_board_info objects and link to them
  26  * from struct soc_camera_host_desc
  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         u32     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         u32 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         {MEDIA_BUS_FMT_SBGGR10_1X10, V4L2_COLORSPACE_SRGB},
  79         {MEDIA_BUS_FMT_SBGGR8_1X8, V4L2_COLORSPACE_SRGB},
  80 };
  81
  82 static const struct mt9m001_datafmt mt9m001_monochrome_fmts[] = {
  83         /* Order important - see above */
  84         {MEDIA_BUS_FMT_Y10_1X10, V4L2_COLORSPACE_JPEG},
  85         {MEDIA_BUS_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         struct v4l2_clk *clk;
  98         const struct mt9m001_datafmt *fmt;
  99         const struct mt9m001_datafmt *fmts;
 100         int num_fmts;
 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         return i2c_smbus_read_word_swapped(client, reg);
 113 }
 114
 115 static int reg_write(struct i2c_client *client, const u8 reg,
 116                      const u16 data)
 117 {
 118         return i2c_smbus_write_word_swapped(client, reg, data);
 119 }
 120
 121 static int reg_set(struct i2c_client *client, const u8 reg,
 122                    const u16 data)
 123 {
 124         int ret;
 125
 126         ret = reg_read(client, reg);
 127         if (ret < 0)
 128                 return ret;
 129         return reg_write(client, reg, ret | data);
 130 }
 131
 132 static int reg_clear(struct i2c_client *client, const u8 reg,
 133                      const u16 data)
 134 {
 135         int ret;
 136
 137         ret = reg_read(client, reg);
 138         if (ret < 0)
 139                 return ret;
 140         return reg_write(client, reg, ret & ~data);
 141 }
 142
 143 static int mt9m001_init(struct i2c_client *client)
 144 {
 145         int ret;
 146
 147         dev_dbg(&client->dev, "%s\n", __func__);
 148
 149         /*
 150          * We don't know, whether platform provides reset, issue a soft reset
 151          * too. This returns all registers to their default values.
 152          */
 153         ret = reg_write(client, MT9M001_RESET, 1);
 154         if (!ret)
 155                 ret = reg_write(client, MT9M001_RESET, 0);
 156
 157         /* Disable chip, synchronous option update */
 158         if (!ret)
 159                 ret = reg_write(client, MT9M001_OUTPUT_CONTROL, 0);
 160
 161         return ret;
 162 }
 163
 164 static int mt9m001_s_stream(struct v4l2_subdev *sd, int enable)
 165 {
 166         struct i2c_client *client = v4l2_get_subdevdata(sd);
 167
 168         /* Switch to master "normal" mode or stop sensor readout */
 169         if (reg_write(client, MT9M001_OUTPUT_CONTROL, enable ? 2 : 0) < 0)
 170                 return -EIO;
 171         return 0;
 172 }
 173
 174 static int mt9m001_set_selection(struct v4l2_subdev *sd,
 175                 struct v4l2_subdev_pad_config *cfg,
 176                 struct v4l2_subdev_selection *sel)
 177 {
 178         struct i2c_client *client = v4l2_get_subdevdata(sd);
 179         struct mt9m001 *mt9m001 = to_mt9m001(client);
 180         struct v4l2_rect rect = sel->r;
 181         const u16 hblank = 9, vblank = 25;
 182         int ret;
 183
 184         if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE ||
 185             sel->target != V4L2_SEL_TGT_CROP)
 186                 return -EINVAL;
 187
 188         if (mt9m001->fmts == mt9m001_colour_fmts)
 189                 /*
 190                  * Bayer format - even number of rows for simplicity,
 191                  * but let the user play with the top row.
 192                  */
 193                 rect.height = ALIGN(rect.height, 2);
 194
 195         /* Datasheet requirement: see register description */
 196         rect.width = ALIGN(rect.width, 2);
 197         rect.left = ALIGN(rect.left, 2);
 198
 199         soc_camera_limit_side(&rect.left, &rect.width,
 200                      MT9M001_COLUMN_SKIP, MT9M001_MIN_WIDTH, MT9M001_MAX_WIDTH);
 201
 202         soc_camera_limit_side(&rect.top, &rect.height,
 203                      MT9M001_ROW_SKIP, MT9M001_MIN_HEIGHT, MT9M001_MAX_HEIGHT);
 204
 205         mt9m001->total_h = rect.height + mt9m001->y_skip_top + vblank;
 206
 207         /* Blanking and start values - default... */
 208         ret = reg_write(client, MT9M001_HORIZONTAL_BLANKING, hblank);
 209         if (!ret)
 210                 ret = reg_write(client, MT9M001_VERTICAL_BLANKING, vblank);
 211
 212         /*
 213          * The caller provides a supported format, as verified per
 214          * call to .set_fmt(FORMAT_TRY).
 215          */
 216         if (!ret)
 217                 ret = reg_write(client, MT9M001_COLUMN_START, rect.left);
 218         if (!ret)
 219                 ret = reg_write(client, MT9M001_ROW_START, rect.top);
 220         if (!ret)
 221                 ret = reg_write(client, MT9M001_WINDOW_WIDTH, rect.width - 1);
 222         if (!ret)
 223                 ret = reg_write(client, MT9M001_WINDOW_HEIGHT,
 224                                 rect.height + mt9m001->y_skip_top - 1);
 225         if (!ret && v4l2_ctrl_g_ctrl(mt9m001->autoexposure) == V4L2_EXPOSURE_AUTO)
 226                 ret = reg_write(client, MT9M001_SHUTTER_WIDTH, mt9m001->total_h);
 227
 228         if (!ret)
 229                 mt9m001->rect = rect;
 230
 231         return ret;
 232 }
 233
 234 static int mt9m001_get_selection(struct v4l2_subdev *sd,
 235                 struct v4l2_subdev_pad_config *cfg,
 236                 struct v4l2_subdev_selection *sel)
 237 {
 238         struct i2c_client *client = v4l2_get_subdevdata(sd);
 239         struct mt9m001 *mt9m001 = to_mt9m001(client);
 240
 241         if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 242                 return -EINVAL;
 243
 244         switch (sel->target) {
 245         case V4L2_SEL_TGT_CROP_BOUNDS:
 246         case V4L2_SEL_TGT_CROP_DEFAULT:
 247                 sel->r.left = MT9M001_COLUMN_SKIP;
 248                 sel->r.top = MT9M001_ROW_SKIP;
 249                 sel->r.width = MT9M001_MAX_WIDTH;
 250                 sel->r.height = MT9M001_MAX_HEIGHT;
 251                 return 0;
 252         case V4L2_SEL_TGT_CROP:
 253                 sel->r = mt9m001->rect;
 254                 return 0;
 255         default:
 256                 return -EINVAL;
 257         }
 258 }
 259
 260 static int mt9m001_get_fmt(struct v4l2_subdev *sd,
 261                 struct v4l2_subdev_pad_config *cfg,
 262                 struct v4l2_subdev_format *format)
 263 {
 264         struct i2c_client *client = v4l2_get_subdevdata(sd);
 265         struct mt9m001 *mt9m001 = to_mt9m001(client);
 266         struct v4l2_mbus_framefmt *mf = &format->format;
 267
 268         if (format->pad)
 269                 return -EINVAL;
 270
 271         mf->width       = mt9m001->rect.width;
 272         mf->height      = mt9m001->rect.height;
 273         mf->code        = mt9m001->fmt->code;
 274         mf->colorspace  = mt9m001->fmt->colorspace;
 275         mf->field       = V4L2_FIELD_NONE;
 276
 277         return 0;
 278 }
 279
 280 static int mt9m001_s_fmt(struct v4l2_subdev *sd,
 281                          struct v4l2_mbus_framefmt *mf)
 282 {
 283         struct i2c_client *client = v4l2_get_subdevdata(sd);
 284         struct mt9m001 *mt9m001 = to_mt9m001(client);
 285         struct v4l2_subdev_selection sel = {
 286                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
 287                 .target = V4L2_SEL_TGT_CROP,
 288                 .r.left = mt9m001->rect.left,
 289                 .r.top = mt9m001->rect.top,
 290                 .r.width = mf->width,
 291                 .r.height = mf->height,
 292         };
 293         int ret;
 294
 295         /* No support for scaling so far, just crop. TODO: use skipping */
 296         ret = mt9m001_set_selection(sd, NULL, &sel);
 297         if (!ret) {
 298                 mf->width       = mt9m001->rect.width;
 299                 mf->height      = mt9m001->rect.height;
 300                 mt9m001->fmt    = mt9m001_find_datafmt(mf->code,
 301                                         mt9m001->fmts, mt9m001->num_fmts);
 302                 mf->colorspace  = mt9m001->fmt->colorspace;
 303         }
 304
 305         return ret;
 306 }
 307
 308 static int mt9m001_set_fmt(struct v4l2_subdev *sd,
 309                 struct v4l2_subdev_pad_config *cfg,
 310                 struct v4l2_subdev_format *format)
 311 {
 312         struct v4l2_mbus_framefmt *mf = &format->format;
 313         struct i2c_client *client = v4l2_get_subdevdata(sd);
 314         struct mt9m001 *mt9m001 = to_mt9m001(client);
 315         const struct mt9m001_datafmt *fmt;
 316
 317         if (format->pad)
 318                 return -EINVAL;
 319
 320         v4l_bound_align_image(&mf->width, MT9M001_MIN_WIDTH,
 321                 MT9M001_MAX_WIDTH, 1,
 322                 &mf->height, MT9M001_MIN_HEIGHT + mt9m001->y_skip_top,
 323                 MT9M001_MAX_HEIGHT + mt9m001->y_skip_top, 0, 0);
 324
 325         if (mt9m001->fmts == mt9m001_colour_fmts)
 326                 mf->height = ALIGN(mf->height - 1, 2);
 327
 328         fmt = mt9m001_find_datafmt(mf->code, mt9m001->fmts,
 329                                    mt9m001->num_fmts);
 330         if (!fmt) {
 331                 fmt = mt9m001->fmt;
 332                 mf->code = fmt->code;
 333         }
 334
 335         mf->colorspace  = fmt->colorspace;
 336
 337         if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
 338                 return mt9m001_s_fmt(sd, mf);
 339         cfg->try_fmt = *mf;
 340         return 0;
 341 }
 342
 343 #ifdef CONFIG_VIDEO_ADV_DEBUG
 344 static int mt9m001_g_register(struct v4l2_subdev *sd,
 345                               struct v4l2_dbg_register *reg)
 346 {
 347         struct i2c_client *client = v4l2_get_subdevdata(sd);
 348
 349         if (reg->reg > 0xff)
 350                 return -EINVAL;
 351
 352         reg->size = 2;
 353         reg->val = reg_read(client, reg->reg);
 354
 355         if (reg->val > 0xffff)
 356                 return -EIO;
 357
 358         return 0;
 359 }
 360
 361 static int mt9m001_s_register(struct v4l2_subdev *sd,
 362                               const struct v4l2_dbg_register *reg)
 363 {
 364         struct i2c_client *client = v4l2_get_subdevdata(sd);
 365
 366         if (reg->reg > 0xff)
 367                 return -EINVAL;
 368
 369         if (reg_write(client, reg->reg, reg->val) < 0)
 370                 return -EIO;
 371
 372         return 0;
 373 }
 374 #endif
 375
 376 static int mt9m001_s_power(struct v4l2_subdev *sd, int on)
 377 {
 378         struct i2c_client *client = v4l2_get_subdevdata(sd);
 379         struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
 380         struct mt9m001 *mt9m001 = to_mt9m001(client);
 381
 382         return soc_camera_set_power(&client->dev, ssdd, mt9m001->clk, on);
 383 }
 384
 385 static int mt9m001_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 386 {
 387         struct mt9m001 *mt9m001 = container_of(ctrl->handler,
 388                                                struct mt9m001, hdl);
 389         s32 min, max;
 390
 391         switch (ctrl->id) {
 392         case V4L2_CID_EXPOSURE_AUTO:
 393                 min = mt9m001->exposure->minimum;
 394                 max = mt9m001->exposure->maximum;
 395                 mt9m001->exposure->val =
 396                         (524 + (mt9m001->total_h - 1) * (max - min)) / 1048 + min;
 397                 break;
 398         }
 399         return 0;
 400 }
 401
 402 static int mt9m001_s_ctrl(struct v4l2_ctrl *ctrl)
 403 {
 404         struct mt9m001 *mt9m001 = container_of(ctrl->handler,
 405                                                struct mt9m001, hdl);
 406         struct v4l2_subdev *sd = &mt9m001->subdev;
 407         struct i2c_client *client = v4l2_get_subdevdata(sd);
 408         struct v4l2_ctrl *exp = mt9m001->exposure;
 409         int data;
 410
 411         switch (ctrl->id) {
 412         case V4L2_CID_VFLIP:
 413                 if (ctrl->val)
 414                         data = reg_set(client, MT9M001_READ_OPTIONS2, 0x8000);
 415                 else
 416                         data = reg_clear(client, MT9M001_READ_OPTIONS2, 0x8000);
 417                 if (data < 0)
 418                         return -EIO;
 419                 return 0;
 420
 421         case V4L2_CID_GAIN:
 422                 /* See Datasheet Table 7, Gain settings. */
 423                 if (ctrl->val <= ctrl->default_value) {
 424                         /* Pack it into 0..1 step 0.125, register values 0..8 */
 425                         unsigned long range = ctrl->default_value - ctrl->minimum;
 426                         data = ((ctrl->val - (s32)ctrl->minimum) * 8 + range / 2) / range;
 427
 428                         dev_dbg(&client->dev, "Setting gain %d\n", data);
 429                         data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
 430                         if (data < 0)
 431                                 return -EIO;
 432                 } else {
 433                         /* Pack it into 1.125..15 variable step, register values 9..67 */
 434                         /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
 435                         unsigned long range = ctrl->maximum - ctrl->default_value - 1;
 436                         unsigned long gain = ((ctrl->val - (s32)ctrl->default_value - 1) *
 437                                                111 + range / 2) / range + 9;
 438
 439                         if (gain <= 32)
 440                                 data = gain;
 441                         else if (gain <= 64)
 442                                 data = ((gain - 32) * 16 + 16) / 32 + 80;
 443                         else
 444                                 data = ((gain - 64) * 7 + 28) / 56 + 96;
 445
 446                         dev_dbg(&client->dev, "Setting gain from %d to %d\n",
 447                                  reg_read(client, MT9M001_GLOBAL_GAIN), data);
 448                         data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
 449                         if (data < 0)
 450                                 return -EIO;
 451                 }
 452                 return 0;
 453
 454         case V4L2_CID_EXPOSURE_AUTO:
 455                 if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
 456                         unsigned long range = exp->maximum - exp->minimum;
 457                         unsigned long shutter = ((exp->val - (s32)exp->minimum) * 1048 +
 458                                                  range / 2) / range + 1;
 459
 460                         dev_dbg(&client->dev,
 461                                 "Setting shutter width from %d to %lu\n",
 462                                 reg_read(client, MT9M001_SHUTTER_WIDTH), shutter);
 463                         if (reg_write(client, MT9M001_SHUTTER_WIDTH, shutter) < 0)
 464                                 return -EIO;
 465                 } else {
 466                         const u16 vblank = 25;
 467
 468                         mt9m001->total_h = mt9m001->rect.height +
 469                                 mt9m001->y_skip_top + vblank;
 470                         if (reg_write(client, MT9M001_SHUTTER_WIDTH, mt9m001->total_h) < 0)
 471                                 return -EIO;
 472                 }
 473                 return 0;
 474         }
 475         return -EINVAL;
 476 }
 477
 478 /*
 479  * Interface active, can use i2c. If it fails, it can indeed mean, that
 480  * this wasn't our capture interface, so, we wait for the right one
 481  */
 482 static int mt9m001_video_probe(struct soc_camera_subdev_desc *ssdd,
 483                                struct i2c_client *client)
 484 {
 485         struct mt9m001 *mt9m001 = to_mt9m001(client);
 486         s32 data;
 487         unsigned long flags;
 488         int ret;
 489
 490         ret = mt9m001_s_power(&mt9m001->subdev, 1);
 491         if (ret < 0)
 492                 return ret;
 493
 494         /* Enable the chip */
 495         data = reg_write(client, MT9M001_CHIP_ENABLE, 1);
 496         dev_dbg(&client->dev, "write: %d\n", data);
 497
 498         /* Read out the chip version register */
 499         data = reg_read(client, MT9M001_CHIP_VERSION);
 500
 501         /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
 502         switch (data) {
 503         case 0x8411:
 504         case 0x8421:
 505                 mt9m001->fmts = mt9m001_colour_fmts;
 506                 break;
 507         case 0x8431:
 508                 mt9m001->fmts = mt9m001_monochrome_fmts;
 509                 break;
 510         default:
 511                 dev_err(&client->dev,
 512                         "No MT9M001 chip detected, register read %x\n", data);
 513                 ret = -ENODEV;
 514                 goto done;
 515         }
 516
 517         mt9m001->num_fmts = 0;
 518
 519         /*
 520          * This is a 10bit sensor, so by default we only allow 10bit.
 521          * The platform may support different bus widths due to
 522          * different routing of the data lines.
 523          */
 524         if (ssdd->query_bus_param)
 525                 flags = ssdd->query_bus_param(ssdd);
 526         else
 527                 flags = SOCAM_DATAWIDTH_10;
 528
 529         if (flags & SOCAM_DATAWIDTH_10)
 530                 mt9m001->num_fmts++;
 531         else
 532                 mt9m001->fmts++;
 533
 534         if (flags & SOCAM_DATAWIDTH_8)
 535                 mt9m001->num_fmts++;
 536
 537         mt9m001->fmt = &mt9m001->fmts[0];
 538
 539         dev_info(&client->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
 540                  data == 0x8431 ? "C12STM" : "C12ST");
 541
 542         ret = mt9m001_init(client);
 543         if (ret < 0) {
 544                 dev_err(&client->dev, "Failed to initialise the camera\n");
 545                 goto done;
 546         }
 547
 548         /* mt9m001_init() has reset the chip, returning registers to defaults */
 549         ret = v4l2_ctrl_handler_setup(&mt9m001->hdl);
 550
 551 done:
 552         mt9m001_s_power(&mt9m001->subdev, 0);
 553         return ret;
 554 }
 555
 556 static void mt9m001_video_remove(struct soc_camera_subdev_desc *ssdd)
 557 {
 558         if (ssdd->free_bus)
 559                 ssdd->free_bus(ssdd);
 560 }
 561
 562 static int mt9m001_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
 563 {
 564         struct i2c_client *client = v4l2_get_subdevdata(sd);
 565         struct mt9m001 *mt9m001 = to_mt9m001(client);
 566
 567         *lines = mt9m001->y_skip_top;
 568
 569         return 0;
 570 }
 571
 572 static const struct v4l2_ctrl_ops mt9m001_ctrl_ops = {
 573         .g_volatile_ctrl = mt9m001_g_volatile_ctrl,
 574         .s_ctrl = mt9m001_s_ctrl,
 575 };
 576
 577 static struct v4l2_subdev_core_ops mt9m001_subdev_core_ops = {
 578 #ifdef CONFIG_VIDEO_ADV_DEBUG
 579         .g_register     = mt9m001_g_register,
 580         .s_register     = mt9m001_s_register,
 581 #endif
 582         .s_power        = mt9m001_s_power,
 583 };
 584
 585 static int mt9m001_enum_mbus_code(struct v4l2_subdev *sd,
 586                 struct v4l2_subdev_pad_config *cfg,
 587                 struct v4l2_subdev_mbus_code_enum *code)
 588 {
 589         struct i2c_client *client = v4l2_get_subdevdata(sd);
 590         struct mt9m001 *mt9m001 = to_mt9m001(client);
 591
 592         if (code->pad || code->index >= mt9m001->num_fmts)
 593                 return -EINVAL;
 594
 595         code->code = mt9m001->fmts[code->index].code;
 596         return 0;
 597 }
 598
 599 static int mt9m001_g_mbus_config(struct v4l2_subdev *sd,
 600                                 struct v4l2_mbus_config *cfg)
 601 {
 602         struct i2c_client *client = v4l2_get_subdevdata(sd);
 603         struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
 604
 605         /* MT9M001 has all capture_format parameters fixed */
 606         cfg->flags = V4L2_MBUS_PCLK_SAMPLE_FALLING |
 607                 V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH |
 608                 V4L2_MBUS_DATA_ACTIVE_HIGH | V4L2_MBUS_MASTER;
 609         cfg->type = V4L2_MBUS_PARALLEL;
 610         cfg->flags = soc_camera_apply_board_flags(ssdd, cfg);
 611
 612         return 0;
 613 }
 614
 615 static int mt9m001_s_mbus_config(struct v4l2_subdev *sd,
 616                                 const struct v4l2_mbus_config *cfg)
 617 {
 618         const struct i2c_client *client = v4l2_get_subdevdata(sd);
 619         struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
 620         struct mt9m001 *mt9m001 = to_mt9m001(client);
 621         unsigned int bps = soc_mbus_get_fmtdesc(mt9m001->fmt->code)->bits_per_sample;
 622
 623         if (ssdd->set_bus_param)
 624                 return ssdd->set_bus_param(ssdd, 1 << (bps - 1));
 625
 626         /*
 627          * Without board specific bus width settings we only support the
 628          * sensors native bus width
 629          */
 630         return bps == 10 ? 0 : -EINVAL;
 631 }
 632
 633 static struct v4l2_subdev_video_ops mt9m001_subdev_video_ops = {
 634         .s_stream       = mt9m001_s_stream,
 635         .g_mbus_config  = mt9m001_g_mbus_config,
 636         .s_mbus_config  = mt9m001_s_mbus_config,
 637 };
 638
 639 static const struct v4l2_subdev_sensor_ops mt9m001_subdev_sensor_ops = {
 640         .g_skip_top_lines       = mt9m001_g_skip_top_lines,
 641 };
 642
 643 static const struct v4l2_subdev_pad_ops mt9m001_subdev_pad_ops = {
 644         .enum_mbus_code = mt9m001_enum_mbus_code,
 645         .get_selection  = mt9m001_get_selection,
 646         .set_selection  = mt9m001_set_selection,
 647         .get_fmt        = mt9m001_get_fmt,
 648         .set_fmt        = mt9m001_set_fmt,
 649 };
 650
 651 static struct v4l2_subdev_ops mt9m001_subdev_ops = {
 652         .core   = &mt9m001_subdev_core_ops,
 653         .video  = &mt9m001_subdev_video_ops,
 654         .sensor = &mt9m001_subdev_sensor_ops,
 655         .pad    = &mt9m001_subdev_pad_ops,
 656 };
 657
 658 static int mt9m001_probe(struct i2c_client *client,
 659                          const struct i2c_device_id *did)
 660 {
 661         struct mt9m001 *mt9m001;
 662         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 663         struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
 664         int ret;
 665
 666         if (!ssdd) {
 667                 dev_err(&client->dev, "MT9M001 driver needs platform data\n");
 668                 return -EINVAL;
 669         }
 670
 671         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
 672                 dev_warn(&adapter->dev,
 673                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
 674                 return -EIO;
 675         }
 676
 677         mt9m001 = devm_kzalloc(&client->dev, sizeof(struct mt9m001), GFP_KERNEL);
 678         if (!mt9m001)
 679                 return -ENOMEM;
 680
 681         v4l2_i2c_subdev_init(&mt9m001->subdev, client, &mt9m001_subdev_ops);
 682         v4l2_ctrl_handler_init(&mt9m001->hdl, 4);
 683         v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
 684                         V4L2_CID_VFLIP, 0, 1, 1, 0);
 685         v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
 686                         V4L2_CID_GAIN, 0, 127, 1, 64);
 687         mt9m001->exposure = v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
 688                         V4L2_CID_EXPOSURE, 1, 255, 1, 255);
 689         /*
 690          * Simulated autoexposure. If enabled, we calculate shutter width
 691          * ourselves in the driver based on vertical blanking and frame width
 692          */
 693         mt9m001->autoexposure = v4l2_ctrl_new_std_menu(&mt9m001->hdl,
 694                         &mt9m001_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
 695                         V4L2_EXPOSURE_AUTO);
 696         mt9m001->subdev.ctrl_handler = &mt9m001->hdl;
 697         if (mt9m001->hdl.error)
 698                 return mt9m001->hdl.error;
 699
 700         v4l2_ctrl_auto_cluster(2, &mt9m001->autoexposure,
 701                                         V4L2_EXPOSURE_MANUAL, true);
 702
 703         /* Second stage probe - when a capture adapter is there */
 704         mt9m001->y_skip_top     = 0;
 705         mt9m001->rect.left      = MT9M001_COLUMN_SKIP;
 706         mt9m001->rect.top       = MT9M001_ROW_SKIP;
 707         mt9m001->rect.width     = MT9M001_MAX_WIDTH;
 708         mt9m001->rect.height    = MT9M001_MAX_HEIGHT;
 709
 710         mt9m001->clk = v4l2_clk_get(&client->dev, "mclk");
 711         if (IS_ERR(mt9m001->clk)) {
 712                 ret = PTR_ERR(mt9m001->clk);
 713                 goto eclkget;
 714         }
 715
 716         ret = mt9m001_video_probe(ssdd, client);
 717         if (ret) {
 718                 v4l2_clk_put(mt9m001->clk);
 719 eclkget:
 720                 v4l2_ctrl_handler_free(&mt9m001->hdl);
 721         }
 722
 723         return ret;
 724 }
 725
 726 static int mt9m001_remove(struct i2c_client *client)
 727 {
 728         struct mt9m001 *mt9m001 = to_mt9m001(client);
 729         struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
 730
 731         v4l2_clk_put(mt9m001->clk);
 732         v4l2_device_unregister_subdev(&mt9m001->subdev);
 733         v4l2_ctrl_handler_free(&mt9m001->hdl);
 734         mt9m001_video_remove(ssdd);
 735
 736         return 0;
 737 }
 738
 739 static const struct i2c_device_id mt9m001_id[] = {
 740         { "mt9m001", 0 },
 741         { }
 742 };
 743 MODULE_DEVICE_TABLE(i2c, mt9m001_id);
 744
 745 static struct i2c_driver mt9m001_i2c_driver = {
 746         .driver = {
 747                 .name = "mt9m001",
 748         },
 749         .probe          = mt9m001_probe,
 750         .remove         = mt9m001_remove,
 751         .id_table       = mt9m001_id,
 752 };
 753
 754 module_i2c_driver(mt9m001_i2c_driver);
 755
 756 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
 757 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
 758 MODULE_LICENSE("GPL");