linux/drivers/media/i2c/soc_camera/mt9m001.c
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   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-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 */
  55struct 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 */
  61static 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
  73static 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
  82static 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
  88struct 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
 105static struct mt9m001 *to_mt9m001(const struct i2c_client *client)
 106{
 107        return container_of(i2c_get_clientdata(client), struct mt9m001, subdev);
 108}
 109
 110static int reg_read(struct i2c_client *client, const u8 reg)
 111{
 112        return i2c_smbus_read_word_swapped(client, reg);
 113}
 114
 115static 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
 121static 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
 132static 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
 143static 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
 164static 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
 174static int mt9m001_s_crop(struct v4l2_subdev *sd, const struct v4l2_crop *a)
 175{
 176        struct i2c_client *client = v4l2_get_subdevdata(sd);
 177        struct mt9m001 *mt9m001 = to_mt9m001(client);
 178        struct v4l2_rect rect = a->c;
 179        int ret;
 180        const u16 hblank = 9, vblank = 25;
 181
 182        if (mt9m001->fmts == mt9m001_colour_fmts)
 183                /*
 184                 * Bayer format - even number of rows for simplicity,
 185                 * but let the user play with the top row.
 186                 */
 187                rect.height = ALIGN(rect.height, 2);
 188
 189        /* Datasheet requirement: see register description */
 190        rect.width = ALIGN(rect.width, 2);
 191        rect.left = ALIGN(rect.left, 2);
 192
 193        soc_camera_limit_side(&rect.left, &rect.width,
 194                     MT9M001_COLUMN_SKIP, MT9M001_MIN_WIDTH, MT9M001_MAX_WIDTH);
 195
 196        soc_camera_limit_side(&rect.top, &rect.height,
 197                     MT9M001_ROW_SKIP, MT9M001_MIN_HEIGHT, MT9M001_MAX_HEIGHT);
 198
 199        mt9m001->total_h = rect.height + mt9m001->y_skip_top + vblank;
 200
 201        /* Blanking and start values - default... */
 202        ret = reg_write(client, MT9M001_HORIZONTAL_BLANKING, hblank);
 203        if (!ret)
 204                ret = reg_write(client, MT9M001_VERTICAL_BLANKING, vblank);
 205
 206        /*
 207         * The caller provides a supported format, as verified per
 208         * call to .try_mbus_fmt()
 209         */
 210        if (!ret)
 211                ret = reg_write(client, MT9M001_COLUMN_START, rect.left);
 212        if (!ret)
 213                ret = reg_write(client, MT9M001_ROW_START, rect.top);
 214        if (!ret)
 215                ret = reg_write(client, MT9M001_WINDOW_WIDTH, rect.width - 1);
 216        if (!ret)
 217                ret = reg_write(client, MT9M001_WINDOW_HEIGHT,
 218                                rect.height + mt9m001->y_skip_top - 1);
 219        if (!ret && v4l2_ctrl_g_ctrl(mt9m001->autoexposure) == V4L2_EXPOSURE_AUTO)
 220                ret = reg_write(client, MT9M001_SHUTTER_WIDTH, mt9m001->total_h);
 221
 222        if (!ret)
 223                mt9m001->rect = rect;
 224
 225        return ret;
 226}
 227
 228static int mt9m001_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
 229{
 230        struct i2c_client *client = v4l2_get_subdevdata(sd);
 231        struct mt9m001 *mt9m001 = to_mt9m001(client);
 232
 233        a->c    = mt9m001->rect;
 234        a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 235
 236        return 0;
 237}
 238
 239static int mt9m001_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
 240{
 241        a->bounds.left                  = MT9M001_COLUMN_SKIP;
 242        a->bounds.top                   = MT9M001_ROW_SKIP;
 243        a->bounds.width                 = MT9M001_MAX_WIDTH;
 244        a->bounds.height                = MT9M001_MAX_HEIGHT;
 245        a->defrect                      = a->bounds;
 246        a->type                         = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 247        a->pixelaspect.numerator        = 1;
 248        a->pixelaspect.denominator      = 1;
 249
 250        return 0;
 251}
 252
 253static int mt9m001_g_fmt(struct v4l2_subdev *sd,
 254                         struct v4l2_mbus_framefmt *mf)
 255{
 256        struct i2c_client *client = v4l2_get_subdevdata(sd);
 257        struct mt9m001 *mt9m001 = to_mt9m001(client);
 258
 259        mf->width       = mt9m001->rect.width;
 260        mf->height      = mt9m001->rect.height;
 261        mf->code        = mt9m001->fmt->code;
 262        mf->colorspace  = mt9m001->fmt->colorspace;
 263        mf->field       = V4L2_FIELD_NONE;
 264
 265        return 0;
 266}
 267
 268static int mt9m001_s_fmt(struct v4l2_subdev *sd,
 269                         struct v4l2_mbus_framefmt *mf)
 270{
 271        struct i2c_client *client = v4l2_get_subdevdata(sd);
 272        struct mt9m001 *mt9m001 = to_mt9m001(client);
 273        struct v4l2_crop a = {
 274                .c = {
 275                        .left   = mt9m001->rect.left,
 276                        .top    = mt9m001->rect.top,
 277                        .width  = mf->width,
 278                        .height = mf->height,
 279                },
 280        };
 281        int ret;
 282
 283        /* No support for scaling so far, just crop. TODO: use skipping */
 284        ret = mt9m001_s_crop(sd, &a);
 285        if (!ret) {
 286                mf->width       = mt9m001->rect.width;
 287                mf->height      = mt9m001->rect.height;
 288                mt9m001->fmt    = mt9m001_find_datafmt(mf->code,
 289                                        mt9m001->fmts, mt9m001->num_fmts);
 290                mf->colorspace  = mt9m001->fmt->colorspace;
 291        }
 292
 293        return ret;
 294}
 295
 296static int mt9m001_try_fmt(struct v4l2_subdev *sd,
 297                           struct v4l2_mbus_framefmt *mf)
 298{
 299        struct i2c_client *client = v4l2_get_subdevdata(sd);
 300        struct mt9m001 *mt9m001 = to_mt9m001(client);
 301        const struct mt9m001_datafmt *fmt;
 302
 303        v4l_bound_align_image(&mf->width, MT9M001_MIN_WIDTH,
 304                MT9M001_MAX_WIDTH, 1,
 305                &mf->height, MT9M001_MIN_HEIGHT + mt9m001->y_skip_top,
 306                MT9M001_MAX_HEIGHT + mt9m001->y_skip_top, 0, 0);
 307
 308        if (mt9m001->fmts == mt9m001_colour_fmts)
 309                mf->height = ALIGN(mf->height - 1, 2);
 310
 311        fmt = mt9m001_find_datafmt(mf->code, mt9m001->fmts,
 312                                   mt9m001->num_fmts);
 313        if (!fmt) {
 314                fmt = mt9m001->fmt;
 315                mf->code = fmt->code;
 316        }
 317
 318        mf->colorspace  = fmt->colorspace;
 319
 320        return 0;
 321}
 322
 323#ifdef CONFIG_VIDEO_ADV_DEBUG
 324static int mt9m001_g_register(struct v4l2_subdev *sd,
 325                              struct v4l2_dbg_register *reg)
 326{
 327        struct i2c_client *client = v4l2_get_subdevdata(sd);
 328
 329        if (reg->reg > 0xff)
 330                return -EINVAL;
 331
 332        reg->size = 2;
 333        reg->val = reg_read(client, reg->reg);
 334
 335        if (reg->val > 0xffff)
 336                return -EIO;
 337
 338        return 0;
 339}
 340
 341static int mt9m001_s_register(struct v4l2_subdev *sd,
 342                              const struct v4l2_dbg_register *reg)
 343{
 344        struct i2c_client *client = v4l2_get_subdevdata(sd);
 345
 346        if (reg->reg > 0xff)
 347                return -EINVAL;
 348
 349        if (reg_write(client, reg->reg, reg->val) < 0)
 350                return -EIO;
 351
 352        return 0;
 353}
 354#endif
 355
 356static int mt9m001_s_power(struct v4l2_subdev *sd, int on)
 357{
 358        struct i2c_client *client = v4l2_get_subdevdata(sd);
 359        struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
 360        struct mt9m001 *mt9m001 = to_mt9m001(client);
 361
 362        return soc_camera_set_power(&client->dev, ssdd, mt9m001->clk, on);
 363}
 364
 365static int mt9m001_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 366{
 367        struct mt9m001 *mt9m001 = container_of(ctrl->handler,
 368                                               struct mt9m001, hdl);
 369        s32 min, max;
 370
 371        switch (ctrl->id) {
 372        case V4L2_CID_EXPOSURE_AUTO:
 373                min = mt9m001->exposure->minimum;
 374                max = mt9m001->exposure->maximum;
 375                mt9m001->exposure->val =
 376                        (524 + (mt9m001->total_h - 1) * (max - min)) / 1048 + min;
 377                break;
 378        }
 379        return 0;
 380}
 381
 382static int mt9m001_s_ctrl(struct v4l2_ctrl *ctrl)
 383{
 384        struct mt9m001 *mt9m001 = container_of(ctrl->handler,
 385                                               struct mt9m001, hdl);
 386        struct v4l2_subdev *sd = &mt9m001->subdev;
 387        struct i2c_client *client = v4l2_get_subdevdata(sd);
 388        struct v4l2_ctrl *exp = mt9m001->exposure;
 389        int data;
 390
 391        switch (ctrl->id) {
 392        case V4L2_CID_VFLIP:
 393                if (ctrl->val)
 394                        data = reg_set(client, MT9M001_READ_OPTIONS2, 0x8000);
 395                else
 396                        data = reg_clear(client, MT9M001_READ_OPTIONS2, 0x8000);
 397                if (data < 0)
 398                        return -EIO;
 399                return 0;
 400
 401        case V4L2_CID_GAIN:
 402                /* See Datasheet Table 7, Gain settings. */
 403                if (ctrl->val <= ctrl->default_value) {
 404                        /* Pack it into 0..1 step 0.125, register values 0..8 */
 405                        unsigned long range = ctrl->default_value - ctrl->minimum;
 406                        data = ((ctrl->val - ctrl->minimum) * 8 + range / 2) / range;
 407
 408                        dev_dbg(&client->dev, "Setting gain %d\n", data);
 409                        data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
 410                        if (data < 0)
 411                                return -EIO;
 412                } else {
 413                        /* Pack it into 1.125..15 variable step, register values 9..67 */
 414                        /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
 415                        unsigned long range = ctrl->maximum - ctrl->default_value - 1;
 416                        unsigned long gain = ((ctrl->val - ctrl->default_value - 1) *
 417                                               111 + range / 2) / range + 9;
 418
 419                        if (gain <= 32)
 420                                data = gain;
 421                        else if (gain <= 64)
 422                                data = ((gain - 32) * 16 + 16) / 32 + 80;
 423                        else
 424                                data = ((gain - 64) * 7 + 28) / 56 + 96;
 425
 426                        dev_dbg(&client->dev, "Setting gain from %d to %d\n",
 427                                 reg_read(client, MT9M001_GLOBAL_GAIN), data);
 428                        data = reg_write(client, MT9M001_GLOBAL_GAIN, data);
 429                        if (data < 0)
 430                                return -EIO;
 431                }
 432                return 0;
 433
 434        case V4L2_CID_EXPOSURE_AUTO:
 435                if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
 436                        unsigned long range = exp->maximum - exp->minimum;
 437                        unsigned long shutter = ((exp->val - exp->minimum) * 1048 +
 438                                                 range / 2) / range + 1;
 439
 440                        dev_dbg(&client->dev,
 441                                "Setting shutter width from %d to %lu\n",
 442                                reg_read(client, MT9M001_SHUTTER_WIDTH), shutter);
 443                        if (reg_write(client, MT9M001_SHUTTER_WIDTH, shutter) < 0)
 444                                return -EIO;
 445                } else {
 446                        const u16 vblank = 25;
 447
 448                        mt9m001->total_h = mt9m001->rect.height +
 449                                mt9m001->y_skip_top + vblank;
 450                        if (reg_write(client, MT9M001_SHUTTER_WIDTH, mt9m001->total_h) < 0)
 451                                return -EIO;
 452                }
 453                return 0;
 454        }
 455        return -EINVAL;
 456}
 457
 458/*
 459 * Interface active, can use i2c. If it fails, it can indeed mean, that
 460 * this wasn't our capture interface, so, we wait for the right one
 461 */
 462static int mt9m001_video_probe(struct soc_camera_subdev_desc *ssdd,
 463                               struct i2c_client *client)
 464{
 465        struct mt9m001 *mt9m001 = to_mt9m001(client);
 466        s32 data;
 467        unsigned long flags;
 468        int ret;
 469
 470        ret = mt9m001_s_power(&mt9m001->subdev, 1);
 471        if (ret < 0)
 472                return ret;
 473
 474        /* Enable the chip */
 475        data = reg_write(client, MT9M001_CHIP_ENABLE, 1);
 476        dev_dbg(&client->dev, "write: %d\n", data);
 477
 478        /* Read out the chip version register */
 479        data = reg_read(client, MT9M001_CHIP_VERSION);
 480
 481        /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
 482        switch (data) {
 483        case 0x8411:
 484        case 0x8421:
 485                mt9m001->fmts = mt9m001_colour_fmts;
 486                break;
 487        case 0x8431:
 488                mt9m001->fmts = mt9m001_monochrome_fmts;
 489                break;
 490        default:
 491                dev_err(&client->dev,
 492                        "No MT9M001 chip detected, register read %x\n", data);
 493                ret = -ENODEV;
 494                goto done;
 495        }
 496
 497        mt9m001->num_fmts = 0;
 498
 499        /*
 500         * This is a 10bit sensor, so by default we only allow 10bit.
 501         * The platform may support different bus widths due to
 502         * different routing of the data lines.
 503         */
 504        if (ssdd->query_bus_param)
 505                flags = ssdd->query_bus_param(ssdd);
 506        else
 507                flags = SOCAM_DATAWIDTH_10;
 508
 509        if (flags & SOCAM_DATAWIDTH_10)
 510                mt9m001->num_fmts++;
 511        else
 512                mt9m001->fmts++;
 513
 514        if (flags & SOCAM_DATAWIDTH_8)
 515                mt9m001->num_fmts++;
 516
 517        mt9m001->fmt = &mt9m001->fmts[0];
 518
 519        dev_info(&client->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
 520                 data == 0x8431 ? "C12STM" : "C12ST");
 521
 522        ret = mt9m001_init(client);
 523        if (ret < 0) {
 524                dev_err(&client->dev, "Failed to initialise the camera\n");
 525                goto done;
 526        }
 527
 528        /* mt9m001_init() has reset the chip, returning registers to defaults */
 529        ret = v4l2_ctrl_handler_setup(&mt9m001->hdl);
 530
 531done:
 532        mt9m001_s_power(&mt9m001->subdev, 0);
 533        return ret;
 534}
 535
 536static void mt9m001_video_remove(struct soc_camera_subdev_desc *ssdd)
 537{
 538        if (ssdd->free_bus)
 539                ssdd->free_bus(ssdd);
 540}
 541
 542static int mt9m001_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
 543{
 544        struct i2c_client *client = v4l2_get_subdevdata(sd);
 545        struct mt9m001 *mt9m001 = to_mt9m001(client);
 546
 547        *lines = mt9m001->y_skip_top;
 548
 549        return 0;
 550}
 551
 552static const struct v4l2_ctrl_ops mt9m001_ctrl_ops = {
 553        .g_volatile_ctrl = mt9m001_g_volatile_ctrl,
 554        .s_ctrl = mt9m001_s_ctrl,
 555};
 556
 557static struct v4l2_subdev_core_ops mt9m001_subdev_core_ops = {
 558#ifdef CONFIG_VIDEO_ADV_DEBUG
 559        .g_register     = mt9m001_g_register,
 560        .s_register     = mt9m001_s_register,
 561#endif
 562        .s_power        = mt9m001_s_power,
 563};
 564
 565static int mt9m001_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
 566                            enum v4l2_mbus_pixelcode *code)
 567{
 568        struct i2c_client *client = v4l2_get_subdevdata(sd);
 569        struct mt9m001 *mt9m001 = to_mt9m001(client);
 570
 571        if (index >= mt9m001->num_fmts)
 572                return -EINVAL;
 573
 574        *code = mt9m001->fmts[index].code;
 575        return 0;
 576}
 577
 578static int mt9m001_g_mbus_config(struct v4l2_subdev *sd,
 579                                struct v4l2_mbus_config *cfg)
 580{
 581        struct i2c_client *client = v4l2_get_subdevdata(sd);
 582        struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
 583
 584        /* MT9M001 has all capture_format parameters fixed */
 585        cfg->flags = V4L2_MBUS_PCLK_SAMPLE_FALLING |
 586                V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH |
 587                V4L2_MBUS_DATA_ACTIVE_HIGH | V4L2_MBUS_MASTER;
 588        cfg->type = V4L2_MBUS_PARALLEL;
 589        cfg->flags = soc_camera_apply_board_flags(ssdd, cfg);
 590
 591        return 0;
 592}
 593
 594static int mt9m001_s_mbus_config(struct v4l2_subdev *sd,
 595                                const struct v4l2_mbus_config *cfg)
 596{
 597        const struct i2c_client *client = v4l2_get_subdevdata(sd);
 598        struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
 599        struct mt9m001 *mt9m001 = to_mt9m001(client);
 600        unsigned int bps = soc_mbus_get_fmtdesc(mt9m001->fmt->code)->bits_per_sample;
 601
 602        if (ssdd->set_bus_param)
 603                return ssdd->set_bus_param(ssdd, 1 << (bps - 1));
 604
 605        /*
 606         * Without board specific bus width settings we only support the
 607         * sensors native bus width
 608         */
 609        return bps == 10 ? 0 : -EINVAL;
 610}
 611
 612static struct v4l2_subdev_video_ops mt9m001_subdev_video_ops = {
 613        .s_stream       = mt9m001_s_stream,
 614        .s_mbus_fmt     = mt9m001_s_fmt,
 615        .g_mbus_fmt     = mt9m001_g_fmt,
 616        .try_mbus_fmt   = mt9m001_try_fmt,
 617        .s_crop         = mt9m001_s_crop,
 618        .g_crop         = mt9m001_g_crop,
 619        .cropcap        = mt9m001_cropcap,
 620        .enum_mbus_fmt  = mt9m001_enum_fmt,
 621        .g_mbus_config  = mt9m001_g_mbus_config,
 622        .s_mbus_config  = mt9m001_s_mbus_config,
 623};
 624
 625static struct v4l2_subdev_sensor_ops mt9m001_subdev_sensor_ops = {
 626        .g_skip_top_lines       = mt9m001_g_skip_top_lines,
 627};
 628
 629static struct v4l2_subdev_ops mt9m001_subdev_ops = {
 630        .core   = &mt9m001_subdev_core_ops,
 631        .video  = &mt9m001_subdev_video_ops,
 632        .sensor = &mt9m001_subdev_sensor_ops,
 633};
 634
 635static int mt9m001_probe(struct i2c_client *client,
 636                         const struct i2c_device_id *did)
 637{
 638        struct mt9m001 *mt9m001;
 639        struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 640        struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
 641        int ret;
 642
 643        if (!ssdd) {
 644                dev_err(&client->dev, "MT9M001 driver needs platform data\n");
 645                return -EINVAL;
 646        }
 647
 648        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
 649                dev_warn(&adapter->dev,
 650                         "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
 651                return -EIO;
 652        }
 653
 654        mt9m001 = devm_kzalloc(&client->dev, sizeof(struct mt9m001), GFP_KERNEL);
 655        if (!mt9m001)
 656                return -ENOMEM;
 657
 658        v4l2_i2c_subdev_init(&mt9m001->subdev, client, &mt9m001_subdev_ops);
 659        v4l2_ctrl_handler_init(&mt9m001->hdl, 4);
 660        v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
 661                        V4L2_CID_VFLIP, 0, 1, 1, 0);
 662        v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
 663                        V4L2_CID_GAIN, 0, 127, 1, 64);
 664        mt9m001->exposure = v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
 665                        V4L2_CID_EXPOSURE, 1, 255, 1, 255);
 666        /*
 667         * Simulated autoexposure. If enabled, we calculate shutter width
 668         * ourselves in the driver based on vertical blanking and frame width
 669         */
 670        mt9m001->autoexposure = v4l2_ctrl_new_std_menu(&mt9m001->hdl,
 671                        &mt9m001_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
 672                        V4L2_EXPOSURE_AUTO);
 673        mt9m001->subdev.ctrl_handler = &mt9m001->hdl;
 674        if (mt9m001->hdl.error)
 675                return mt9m001->hdl.error;
 676
 677        v4l2_ctrl_auto_cluster(2, &mt9m001->autoexposure,
 678                                        V4L2_EXPOSURE_MANUAL, true);
 679
 680        /* Second stage probe - when a capture adapter is there */
 681        mt9m001->y_skip_top     = 0;
 682        mt9m001->rect.left      = MT9M001_COLUMN_SKIP;
 683        mt9m001->rect.top       = MT9M001_ROW_SKIP;
 684        mt9m001->rect.width     = MT9M001_MAX_WIDTH;
 685        mt9m001->rect.height    = MT9M001_MAX_HEIGHT;
 686
 687        mt9m001->clk = v4l2_clk_get(&client->dev, "mclk");
 688        if (IS_ERR(mt9m001->clk)) {
 689                ret = PTR_ERR(mt9m001->clk);
 690                goto eclkget;
 691        }
 692
 693        ret = mt9m001_video_probe(ssdd, client);
 694        if (ret) {
 695                v4l2_clk_put(mt9m001->clk);
 696eclkget:
 697                v4l2_ctrl_handler_free(&mt9m001->hdl);
 698        }
 699
 700        return ret;
 701}
 702
 703static int mt9m001_remove(struct i2c_client *client)
 704{
 705        struct mt9m001 *mt9m001 = to_mt9m001(client);
 706        struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
 707
 708        v4l2_clk_put(mt9m001->clk);
 709        v4l2_device_unregister_subdev(&mt9m001->subdev);
 710        v4l2_ctrl_handler_free(&mt9m001->hdl);
 711        mt9m001_video_remove(ssdd);
 712
 713        return 0;
 714}
 715
 716static const struct i2c_device_id mt9m001_id[] = {
 717        { "mt9m001", 0 },
 718        { }
 719};
 720MODULE_DEVICE_TABLE(i2c, mt9m001_id);
 721
 722static struct i2c_driver mt9m001_i2c_driver = {
 723        .driver = {
 724                .name = "mt9m001",
 725        },
 726        .probe          = mt9m001_probe,
 727        .remove         = mt9m001_remove,
 728        .id_table       = mt9m001_id,
 729};
 730
 731module_i2c_driver(mt9m001_i2c_driver);
 732
 733MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
 734MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
 735MODULE_LICENSE("GPL");
 736