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         int ret;
 121
 122         /* Disable chip, synchronous option update */
 123         dev_dbg(icd->vdev->dev, "%s\n", __func__);
 124
 125         ret = reg_write(icd, MT9M001_RESET, 1);
 126         if (ret >= 0)
 127                 ret = reg_write(icd, MT9M001_RESET, 0);
 128         if (ret >= 0)
 129                 ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
 130
 131         return ret >= 0 ? 0 : -EIO;
 132 }
 133
 134 static int mt9m001_release(struct soc_camera_device *icd)
 135 {
 136         /* Disable the chip */
 137         reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
 138         return 0;
 139 }
 140
 141 static int mt9m001_start_capture(struct soc_camera_device *icd)
 142 {
 143         /* Switch to master "normal" mode */
 144         if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0)
 145                 return -EIO;
 146         return 0;
 147 }
 148
 149 static int mt9m001_stop_capture(struct soc_camera_device *icd)
 150 {
 151         /* Stop sensor readout */
 152         if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0)
 153                 return -EIO;
 154         return 0;
 155 }
 156
 157 static int bus_switch_request(struct mt9m001 *mt9m001,
 158                               struct soc_camera_link *icl)
 159 {
 160 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
 161         int ret;
 162         unsigned int gpio = icl->gpio;
 163
 164         if (gpio_is_valid(gpio)) {
 165                 /* We have a data bus switch. */
 166                 ret = gpio_request(gpio, "mt9m001");
 167                 if (ret < 0) {
 168                         dev_err(&mt9m001->client->dev, "Cannot get GPIO %u\n",
 169                                 gpio);
 170                         return ret;
 171                 }
 172
 173                 ret = gpio_direction_output(gpio, 0);
 174                 if (ret < 0) {
 175                         dev_err(&mt9m001->client->dev,
 176                                 "Cannot set GPIO %u to output\n", gpio);
 177                         gpio_free(gpio);
 178                         return ret;
 179                 }
 180         }
 181
 182         mt9m001->switch_gpio = gpio;
 183 #else
 184         mt9m001->switch_gpio = -EINVAL;
 185 #endif
 186         return 0;
 187 }
 188
 189 static void bus_switch_release(struct mt9m001 *mt9m001)
 190 {
 191 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
 192         if (gpio_is_valid(mt9m001->switch_gpio))
 193                 gpio_free(mt9m001->switch_gpio);
 194 #endif
 195 }
 196
 197 static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit)
 198 {
 199 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
 200         if (!gpio_is_valid(mt9m001->switch_gpio))
 201                 return -ENODEV;
 202
 203         gpio_set_value_cansleep(mt9m001->switch_gpio, go8bit);
 204         return 0;
 205 #else
 206         return -ENODEV;
 207 #endif
 208 }
 209
 210 static int bus_switch_possible(struct mt9m001 *mt9m001)
 211 {
 212 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
 213         return gpio_is_valid(mt9m001->switch_gpio);
 214 #else
 215         return 0;
 216 #endif
 217 }
 218
 219 static int mt9m001_set_bus_param(struct soc_camera_device *icd,
 220                                  unsigned long flags)
 221 {
 222         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 223         unsigned int width_flag = flags & SOCAM_DATAWIDTH_MASK;
 224         int ret;
 225
 226         /* Flags validity verified in test_bus_param */
 227
 228         if ((mt9m001->datawidth != 10 && (width_flag == SOCAM_DATAWIDTH_10)) ||
 229             (mt9m001->datawidth != 9  && (width_flag == SOCAM_DATAWIDTH_9)) ||
 230             (mt9m001->datawidth != 8  && (width_flag == SOCAM_DATAWIDTH_8))) {
 231                 /* Well, we actually only can do 10 or 8 bits... */
 232                 if (width_flag == SOCAM_DATAWIDTH_9)
 233                         return -EINVAL;
 234                 ret = bus_switch_act(mt9m001,
 235                                      width_flag == SOCAM_DATAWIDTH_8);
 236                 if (ret < 0)
 237                         return ret;
 238
 239                 mt9m001->datawidth = width_flag == SOCAM_DATAWIDTH_8 ? 8 : 10;
 240         }
 241
 242         return 0;
 243 }
 244
 245 static unsigned long mt9m001_query_bus_param(struct soc_camera_device *icd)
 246 {
 247         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 248         unsigned int width_flag = SOCAM_DATAWIDTH_10;
 249
 250         if (bus_switch_possible(mt9m001))
 251                 width_flag |= SOCAM_DATAWIDTH_8;
 252
 253         /* MT9M001 has all capture_format parameters fixed */
 254         return SOCAM_PCLK_SAMPLE_RISING |
 255                 SOCAM_HSYNC_ACTIVE_HIGH |
 256                 SOCAM_VSYNC_ACTIVE_HIGH |
 257                 SOCAM_MASTER |
 258                 width_flag;
 259 }
 260
 261 static int mt9m001_set_fmt_cap(struct soc_camera_device *icd,
 262                 __u32 pixfmt, struct v4l2_rect *rect)
 263 {
 264         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 265         int ret;
 266         const u16 hblank = 9, vblank = 25;
 267
 268         /* Blanking and start values - default... */
 269         ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank);
 270         if (ret >= 0)
 271                 ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank);
 272
 273         /* The caller provides a supported format, as verified per
 274          * call to icd->try_fmt_cap() */
 275         if (ret >= 0)
 276                 ret = reg_write(icd, MT9M001_COLUMN_START, rect->left);
 277         if (ret >= 0)
 278                 ret = reg_write(icd, MT9M001_ROW_START, rect->top);
 279         if (ret >= 0)
 280                 ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1);
 281         if (ret >= 0)
 282                 ret = reg_write(icd, MT9M001_WINDOW_HEIGHT,
 283                                 rect->height + icd->y_skip_top - 1);
 284         if (ret >= 0 && mt9m001->autoexposure) {
 285                 ret = reg_write(icd, MT9M001_SHUTTER_WIDTH,
 286                                 rect->height + icd->y_skip_top + vblank);
 287                 if (ret >= 0) {
 288                         const struct v4l2_queryctrl *qctrl =
 289                                 soc_camera_find_qctrl(icd->ops,
 290                                                       V4L2_CID_EXPOSURE);
 291                         icd->exposure = (524 + (rect->height + icd->y_skip_top +
 292                                                 vblank - 1) *
 293                                          (qctrl->maximum - qctrl->minimum)) /
 294                                 1048 + qctrl->minimum;
 295                 }
 296         }
 297
 298         return ret < 0 ? ret : 0;
 299 }
 300
 301 static int mt9m001_try_fmt_cap(struct soc_camera_device *icd,
 302                                struct v4l2_format *f)
 303 {
 304         if (f->fmt.pix.height < 32 + icd->y_skip_top)
 305                 f->fmt.pix.height = 32 + icd->y_skip_top;
 306         if (f->fmt.pix.height > 1024 + icd->y_skip_top)
 307                 f->fmt.pix.height = 1024 + icd->y_skip_top;
 308         if (f->fmt.pix.width < 48)
 309                 f->fmt.pix.width = 48;
 310         if (f->fmt.pix.width > 1280)
 311                 f->fmt.pix.width = 1280;
 312         f->fmt.pix.width &= ~0x01; /* has to be even, unsure why was ~3 */
 313
 314         return 0;
 315 }
 316
 317 static int mt9m001_get_chip_id(struct soc_camera_device *icd,
 318                                struct v4l2_chip_ident *id)
 319 {
 320         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 321
 322         if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR)
 323                 return -EINVAL;
 324
 325         if (id->match_chip != mt9m001->client->addr)
 326                 return -ENODEV;
 327
 328         id->ident       = mt9m001->model;
 329         id->revision    = 0;
 330
 331         return 0;
 332 }
 333
 334 #ifdef CONFIG_VIDEO_ADV_DEBUG
 335 static int mt9m001_get_register(struct soc_camera_device *icd,
 336                                 struct v4l2_register *reg)
 337 {
 338         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 339
 340         if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 341                 return -EINVAL;
 342
 343         if (reg->match_chip != mt9m001->client->addr)
 344                 return -ENODEV;
 345
 346         reg->val = reg_read(icd, reg->reg);
 347
 348         if (reg->val > 0xffff)
 349                 return -EIO;
 350
 351         return 0;
 352 }
 353
 354 static int mt9m001_set_register(struct soc_camera_device *icd,
 355                                 struct v4l2_register *reg)
 356 {
 357         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 358
 359         if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
 360                 return -EINVAL;
 361
 362         if (reg->match_chip != mt9m001->client->addr)
 363                 return -ENODEV;
 364
 365         if (reg_write(icd, reg->reg, reg->val) < 0)
 366                 return -EIO;
 367
 368         return 0;
 369 }
 370 #endif
 371
 372 static const struct v4l2_queryctrl mt9m001_controls[] = {
 373         {
 374                 .id             = V4L2_CID_VFLIP,
 375                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
 376                 .name           = "Flip Vertically",
 377                 .minimum        = 0,
 378                 .maximum        = 1,
 379                 .step           = 1,
 380                 .default_value  = 0,
 381         }, {
 382                 .id             = V4L2_CID_GAIN,
 383                 .type           = V4L2_CTRL_TYPE_INTEGER,
 384                 .name           = "Gain",
 385                 .minimum        = 0,
 386                 .maximum        = 127,
 387                 .step           = 1,
 388                 .default_value  = 64,
 389                 .flags          = V4L2_CTRL_FLAG_SLIDER,
 390         }, {
 391                 .id             = V4L2_CID_EXPOSURE,
 392                 .type           = V4L2_CTRL_TYPE_INTEGER,
 393                 .name           = "Exposure",
 394                 .minimum        = 1,
 395                 .maximum        = 255,
 396                 .step           = 1,
 397                 .default_value  = 255,
 398                 .flags          = V4L2_CTRL_FLAG_SLIDER,
 399         }, {
 400                 .id             = V4L2_CID_EXPOSURE_AUTO,
 401                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
 402                 .name           = "Automatic Exposure",
 403                 .minimum        = 0,
 404                 .maximum        = 1,
 405                 .step           = 1,
 406                 .default_value  = 1,
 407         }
 408 };
 409
 410 static int mt9m001_video_probe(struct soc_camera_device *);
 411 static void mt9m001_video_remove(struct soc_camera_device *);
 412 static int mt9m001_get_control(struct soc_camera_device *, struct v4l2_control *);
 413 static int mt9m001_set_control(struct soc_camera_device *, struct v4l2_control *);
 414
 415 static struct soc_camera_ops mt9m001_ops = {
 416         .owner                  = THIS_MODULE,
 417         .probe                  = mt9m001_video_probe,
 418         .remove                 = mt9m001_video_remove,
 419         .init                   = mt9m001_init,
 420         .release                = mt9m001_release,
 421         .start_capture          = mt9m001_start_capture,
 422         .stop_capture           = mt9m001_stop_capture,
 423         .set_fmt_cap            = mt9m001_set_fmt_cap,
 424         .try_fmt_cap            = mt9m001_try_fmt_cap,
 425         .set_bus_param          = mt9m001_set_bus_param,
 426         .query_bus_param        = mt9m001_query_bus_param,
 427         .controls               = mt9m001_controls,
 428         .num_controls           = ARRAY_SIZE(mt9m001_controls),
 429         .get_control            = mt9m001_get_control,
 430         .set_control            = mt9m001_set_control,
 431         .get_chip_id            = mt9m001_get_chip_id,
 432 #ifdef CONFIG_VIDEO_ADV_DEBUG
 433         .get_register           = mt9m001_get_register,
 434         .set_register           = mt9m001_set_register,
 435 #endif
 436 };
 437
 438 static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
 439 {
 440         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 441         int data;
 442
 443         switch (ctrl->id) {
 444         case V4L2_CID_VFLIP:
 445                 data = reg_read(icd, MT9M001_READ_OPTIONS2);
 446                 if (data < 0)
 447                         return -EIO;
 448                 ctrl->value = !!(data & 0x8000);
 449                 break;
 450         case V4L2_CID_EXPOSURE_AUTO:
 451                 ctrl->value = mt9m001->autoexposure;
 452                 break;
 453         }
 454         return 0;
 455 }
 456
 457 static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
 458 {
 459         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 460         const struct v4l2_queryctrl *qctrl;
 461         int data;
 462
 463         qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id);
 464
 465         if (!qctrl)
 466                 return -EINVAL;
 467
 468         switch (ctrl->id) {
 469         case V4L2_CID_VFLIP:
 470                 if (ctrl->value)
 471                         data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000);
 472                 else
 473                         data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000);
 474                 if (data < 0)
 475                         return -EIO;
 476                 break;
 477         case V4L2_CID_GAIN:
 478                 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
 479                         return -EINVAL;
 480                 /* See Datasheet Table 7, Gain settings. */
 481                 if (ctrl->value <= qctrl->default_value) {
 482                         /* Pack it into 0..1 step 0.125, register values 0..8 */
 483                         unsigned long range = qctrl->default_value - qctrl->minimum;
 484                         data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
 485
 486                         dev_dbg(&icd->dev, "Setting gain %d\n", data);
 487                         data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
 488                         if (data < 0)
 489                                 return -EIO;
 490                 } else {
 491                         /* Pack it into 1.125..15 variable step, register values 9..67 */
 492                         /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
 493                         unsigned long range = qctrl->maximum - qctrl->default_value - 1;
 494                         unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
 495                                                111 + range / 2) / range + 9;
 496
 497                         if (gain <= 32)
 498                                 data = gain;
 499                         else if (gain <= 64)
 500                                 data = ((gain - 32) * 16 + 16) / 32 + 80;
 501                         else
 502                                 data = ((gain - 64) * 7 + 28) / 56 + 96;
 503
 504                         dev_dbg(&icd->dev, "Setting gain from %d to %d\n",
 505                                  reg_read(icd, MT9M001_GLOBAL_GAIN), data);
 506                         data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
 507                         if (data < 0)
 508                                 return -EIO;
 509                 }
 510
 511                 /* Success */
 512                 icd->gain = ctrl->value;
 513                 break;
 514         case V4L2_CID_EXPOSURE:
 515                 /* mt9m001 has maximum == default */
 516                 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
 517                         return -EINVAL;
 518                 else {
 519                         unsigned long range = qctrl->maximum - qctrl->minimum;
 520                         unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 +
 521                                                  range / 2) / range + 1;
 522
 523                         dev_dbg(&icd->dev, "Setting shutter width from %d to %lu\n",
 524                                  reg_read(icd, MT9M001_SHUTTER_WIDTH), shutter);
 525                         if (reg_write(icd, MT9M001_SHUTTER_WIDTH, shutter) < 0)
 526                                 return -EIO;
 527                         icd->exposure = ctrl->value;
 528                         mt9m001->autoexposure = 0;
 529                 }
 530                 break;
 531         case V4L2_CID_EXPOSURE_AUTO:
 532                 if (ctrl->value) {
 533                         const u16 vblank = 25;
 534                         if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height +
 535                                       icd->y_skip_top + vblank) < 0)
 536                                 return -EIO;
 537                         qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
 538                         icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) *
 539                                          (qctrl->maximum - qctrl->minimum)) /
 540                                 1048 + qctrl->minimum;
 541                         mt9m001->autoexposure = 1;
 542                 } else
 543                         mt9m001->autoexposure = 0;
 544                 break;
 545         }
 546         return 0;
 547 }
 548
 549 /* Interface active, can use i2c. If it fails, it can indeed mean, that
 550  * this wasn't our capture interface, so, we wait for the right one */
 551 static int mt9m001_video_probe(struct soc_camera_device *icd)
 552 {
 553         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 554         s32 data;
 555         int ret;
 556
 557         /* We must have a parent by now. And it cannot be a wrong one.
 558          * So this entire test is completely redundant. */
 559         if (!icd->dev.parent ||
 560             to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
 561                 return -ENODEV;
 562
 563         /* Enable the chip */
 564         data = reg_write(&mt9m001->icd, MT9M001_CHIP_ENABLE, 1);
 565         dev_dbg(&icd->dev, "write: %d\n", data);
 566
 567         /* Read out the chip version register */
 568         data = reg_read(icd, MT9M001_CHIP_VERSION);
 569
 570         /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
 571         switch (data) {
 572         case 0x8411:
 573         case 0x8421:
 574                 mt9m001->model = V4L2_IDENT_MT9M001C12ST;
 575                 icd->formats = mt9m001_colour_formats;
 576                 if (mt9m001->client->dev.platform_data)
 577                         icd->num_formats = ARRAY_SIZE(mt9m001_colour_formats);
 578                 else
 579                         icd->num_formats = 1;
 580                 break;
 581         case 0x8431:
 582                 mt9m001->model = V4L2_IDENT_MT9M001C12STM;
 583                 icd->formats = mt9m001_monochrome_formats;
 584                 if (mt9m001->client->dev.platform_data)
 585                         icd->num_formats = ARRAY_SIZE(mt9m001_monochrome_formats);
 586                 else
 587                         icd->num_formats = 1;
 588                 break;
 589         default:
 590                 ret = -ENODEV;
 591                 dev_err(&icd->dev,
 592                         "No MT9M001 chip detected, register read %x\n", data);
 593                 goto ei2c;
 594         }
 595
 596         dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
 597                  data == 0x8431 ? "C12STM" : "C12ST");
 598
 599         /* Now that we know the model, we can start video */
 600         ret = soc_camera_video_start(icd);
 601         if (ret)
 602                 goto eisis;
 603
 604         return 0;
 605
 606 eisis:
 607 ei2c:
 608         return ret;
 609 }
 610
 611 static void mt9m001_video_remove(struct soc_camera_device *icd)
 612 {
 613         struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
 614
 615         dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr,
 616                 mt9m001->icd.dev.parent, mt9m001->icd.vdev);
 617         soc_camera_video_stop(&mt9m001->icd);
 618 }
 619
 620 static int mt9m001_probe(struct i2c_client *client,
 621                          const struct i2c_device_id *did)
 622 {
 623         struct mt9m001 *mt9m001;
 624         struct soc_camera_device *icd;
 625         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 626         struct soc_camera_link *icl = client->dev.platform_data;
 627         int ret;
 628
 629         if (!icl) {
 630                 dev_err(&client->dev, "MT9M001 driver needs platform data\n");
 631                 return -EINVAL;
 632         }
 633
 634         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
 635                 dev_warn(&adapter->dev,
 636                          "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
 637                 return -EIO;
 638         }
 639
 640         mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL);
 641         if (!mt9m001)
 642                 return -ENOMEM;
 643
 644         mt9m001->client = client;
 645         i2c_set_clientdata(client, mt9m001);
 646
 647         /* Second stage probe - when a capture adapter is there */
 648         icd = &mt9m001->icd;
 649         icd->ops        = &mt9m001_ops;
 650         icd->control    = &client->dev;
 651         icd->x_min      = 20;
 652         icd->y_min      = 12;
 653         icd->x_current  = 20;
 654         icd->y_current  = 12;
 655         icd->width_min  = 48;
 656         icd->width_max  = 1280;
 657         icd->height_min = 32;
 658         icd->height_max = 1024;
 659         icd->y_skip_top = 1;
 660         icd->iface      = icl->bus_id;
 661         /* Default datawidth - this is the only width this camera (normally)
 662          * supports. It is only with extra logic that it can support
 663          * other widths. Therefore it seems to be a sensible default. */
 664         mt9m001->datawidth = 10;
 665         /* Simulated autoexposure. If enabled, we calculate shutter width
 666          * ourselves in the driver based on vertical blanking and frame width */
 667         mt9m001->autoexposure = 1;
 668
 669         ret = bus_switch_request(mt9m001, icl);
 670         if (ret)
 671                 goto eswinit;
 672
 673         ret = soc_camera_device_register(icd);
 674         if (ret)
 675                 goto eisdr;
 676
 677         return 0;
 678
 679 eisdr:
 680         bus_switch_release(mt9m001);
 681 eswinit:
 682         kfree(mt9m001);
 683         return ret;
 684 }
 685
 686 static int mt9m001_remove(struct i2c_client *client)
 687 {
 688         struct mt9m001 *mt9m001 = i2c_get_clientdata(client);
 689
 690         soc_camera_device_unregister(&mt9m001->icd);
 691         bus_switch_release(mt9m001);
 692         kfree(mt9m001);
 693
 694         return 0;
 695 }
 696
 697 static const struct i2c_device_id mt9m001_id[] = {
 698         { "mt9m001", 0 },
 699         { }
 700 };
 701 MODULE_DEVICE_TABLE(i2c, mt9m001_id);
 702
 703 static struct i2c_driver mt9m001_i2c_driver = {
 704         .driver = {
 705                 .name = "mt9m001",
 706         },
 707         .probe          = mt9m001_probe,
 708         .remove         = mt9m001_remove,
 709         .id_table       = mt9m001_id,
 710 };
 711
 712 static int __init mt9m001_mod_init(void)
 713 {
 714         return i2c_add_driver(&mt9m001_i2c_driver);
 715 }
 716
 717 static void __exit mt9m001_mod_exit(void)
 718 {
 719         i2c_del_driver(&mt9m001_i2c_driver);
 720 }
 721
 722 module_init(mt9m001_mod_init);
 723 module_exit(mt9m001_mod_exit);
 724
 725 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
 726 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
 727 MODULE_LICENSE("GPL");