drivers/media/i2c/mt9v011.c

   1 /*
   2  * mt9v011 -Micron 1/4-Inch VGA Digital Image Sensor
   3  *
   4  * Copyright (c) 2009 Mauro Carvalho Chehab
   5  * This code is placed under the terms of the GNU General Public License v2
   6  */
   7
   8 #include <linux/i2c.h>
   9 #include <linux/slab.h>
  10 #include <linux/videodev2.h>
  11 #include <linux/delay.h>
  12 #include <linux/module.h>
  13 #include <asm/div64.h>
  14 #include <media/v4l2-device.h>
  15 #include <media/v4l2-ctrls.h>
  16 #include <media/i2c/mt9v011.h>
  17
  18 MODULE_DESCRIPTION("Micron mt9v011 sensor driver");
  19 MODULE_AUTHOR("Mauro Carvalho Chehab");
  20 MODULE_LICENSE("GPL");
  21
  22 static int debug;
  23 module_param(debug, int, 0);
  24 MODULE_PARM_DESC(debug, "Debug level (0-2)");
  25
  26 #define R00_MT9V011_CHIP_VERSION        0x00
  27 #define R01_MT9V011_ROWSTART            0x01
  28 #define R02_MT9V011_COLSTART            0x02
  29 #define R03_MT9V011_HEIGHT              0x03
  30 #define R04_MT9V011_WIDTH               0x04
  31 #define R05_MT9V011_HBLANK              0x05
  32 #define R06_MT9V011_VBLANK              0x06
  33 #define R07_MT9V011_OUT_CTRL            0x07
  34 #define R09_MT9V011_SHUTTER_WIDTH       0x09
  35 #define R0A_MT9V011_CLK_SPEED           0x0a
  36 #define R0B_MT9V011_RESTART             0x0b
  37 #define R0C_MT9V011_SHUTTER_DELAY       0x0c
  38 #define R0D_MT9V011_RESET               0x0d
  39 #define R1E_MT9V011_DIGITAL_ZOOM        0x1e
  40 #define R20_MT9V011_READ_MODE           0x20
  41 #define R2B_MT9V011_GREEN_1_GAIN        0x2b
  42 #define R2C_MT9V011_BLUE_GAIN           0x2c
  43 #define R2D_MT9V011_RED_GAIN            0x2d
  44 #define R2E_MT9V011_GREEN_2_GAIN        0x2e
  45 #define R35_MT9V011_GLOBAL_GAIN         0x35
  46 #define RF1_MT9V011_CHIP_ENABLE         0xf1
  47
  48 #define MT9V011_VERSION                 0x8232
  49 #define MT9V011_REV_B_VERSION           0x8243
  50
  51 struct mt9v011 {
  52         struct v4l2_subdev sd;
  53 #ifdef CONFIG_MEDIA_CONTROLLER
  54         struct media_pad pad;
  55 #endif
  56         struct v4l2_ctrl_handler ctrls;
  57         unsigned width, height;
  58         unsigned xtal;
  59         unsigned hflip:1;
  60         unsigned vflip:1;
  61
  62         u16 global_gain, exposure;
  63         s16 red_bal, blue_bal;
  64 };
  65
  66 static inline struct mt9v011 *to_mt9v011(struct v4l2_subdev *sd)
  67 {
  68         return container_of(sd, struct mt9v011, sd);
  69 }
  70
  71 static int mt9v011_read(struct v4l2_subdev *sd, unsigned char addr)
  72 {
  73         struct i2c_client *c = v4l2_get_subdevdata(sd);
  74         __be16 buffer;
  75         int rc, val;
  76
  77         rc = i2c_master_send(c, &addr, 1);
  78         if (rc != 1)
  79                 v4l2_dbg(0, debug, sd,
  80                          "i2c i/o error: rc == %d (should be 1)\n", rc);
  81
  82         msleep(10);
  83
  84         rc = i2c_master_recv(c, (char *)&buffer, 2);
  85         if (rc != 2)
  86                 v4l2_dbg(0, debug, sd,
  87                          "i2c i/o error: rc == %d (should be 2)\n", rc);
  88
  89         val = be16_to_cpu(buffer);
  90
  91         v4l2_dbg(2, debug, sd, "mt9v011: read 0x%02x = 0x%04x\n", addr, val);
  92
  93         return val;
  94 }
  95
  96 static void mt9v011_write(struct v4l2_subdev *sd, unsigned char addr,
  97                                  u16 value)
  98 {
  99         struct i2c_client *c = v4l2_get_subdevdata(sd);
 100         unsigned char buffer[3];
 101         int rc;
 102
 103         buffer[0] = addr;
 104         buffer[1] = value >> 8;
 105         buffer[2] = value & 0xff;
 106
 107         v4l2_dbg(2, debug, sd,
 108                  "mt9v011: writing 0x%02x 0x%04x\n", buffer[0], value);
 109         rc = i2c_master_send(c, buffer, 3);
 110         if (rc != 3)
 111                 v4l2_dbg(0, debug, sd,
 112                          "i2c i/o error: rc == %d (should be 3)\n", rc);
 113 }
 114
 115
 116 struct i2c_reg_value {
 117         unsigned char reg;
 118         u16           value;
 119 };
 120
 121 /*
 122  * Values used at the original driver
 123  * Some values are marked as Reserved at the datasheet
 124  */
 125 static const struct i2c_reg_value mt9v011_init_default[] = {
 126                 { R0D_MT9V011_RESET, 0x0001 },
 127                 { R0D_MT9V011_RESET, 0x0000 },
 128
 129                 { R0C_MT9V011_SHUTTER_DELAY, 0x0000 },
 130                 { R09_MT9V011_SHUTTER_WIDTH, 0x1fc },
 131
 132                 { R0A_MT9V011_CLK_SPEED, 0x0000 },
 133                 { R1E_MT9V011_DIGITAL_ZOOM,  0x0000 },
 134
 135                 { R07_MT9V011_OUT_CTRL, 0x0002 },       /* chip enable */
 136 };
 137
 138
 139 static u16 calc_mt9v011_gain(s16 lineargain)
 140 {
 141
 142         u16 digitalgain = 0;
 143         u16 analogmult = 0;
 144         u16 analoginit = 0;
 145
 146         if (lineargain < 0)
 147                 lineargain = 0;
 148
 149         /* recommended minimum */
 150         lineargain += 0x0020;
 151
 152         if (lineargain > 2047)
 153                 lineargain = 2047;
 154
 155         if (lineargain > 1023) {
 156                 digitalgain = 3;
 157                 analogmult = 3;
 158                 analoginit = lineargain / 16;
 159         } else if (lineargain > 511) {
 160                 digitalgain = 1;
 161                 analogmult = 3;
 162                 analoginit = lineargain / 8;
 163         } else if (lineargain > 255) {
 164                 analogmult = 3;
 165                 analoginit = lineargain / 4;
 166         } else if (lineargain > 127) {
 167                 analogmult = 1;
 168                 analoginit = lineargain / 2;
 169         } else
 170                 analoginit = lineargain;
 171
 172         return analoginit + (analogmult << 7) + (digitalgain << 9);
 173
 174 }
 175
 176 static void set_balance(struct v4l2_subdev *sd)
 177 {
 178         struct mt9v011 *core = to_mt9v011(sd);
 179         u16 green_gain, blue_gain, red_gain;
 180         u16 exposure;
 181         s16 bal;
 182
 183         exposure = core->exposure;
 184
 185         green_gain = calc_mt9v011_gain(core->global_gain);
 186
 187         bal = core->global_gain;
 188         bal += (core->blue_bal * core->global_gain / (1 << 7));
 189         blue_gain = calc_mt9v011_gain(bal);
 190
 191         bal = core->global_gain;
 192         bal += (core->red_bal * core->global_gain / (1 << 7));
 193         red_gain = calc_mt9v011_gain(bal);
 194
 195         mt9v011_write(sd, R2B_MT9V011_GREEN_1_GAIN, green_gain);
 196         mt9v011_write(sd, R2E_MT9V011_GREEN_2_GAIN, green_gain);
 197         mt9v011_write(sd, R2C_MT9V011_BLUE_GAIN, blue_gain);
 198         mt9v011_write(sd, R2D_MT9V011_RED_GAIN, red_gain);
 199         mt9v011_write(sd, R09_MT9V011_SHUTTER_WIDTH, exposure);
 200 }
 201
 202 static void calc_fps(struct v4l2_subdev *sd, u32 *numerator, u32 *denominator)
 203 {
 204         struct mt9v011 *core = to_mt9v011(sd);
 205         unsigned height, width, hblank, vblank, speed;
 206         unsigned row_time, t_time;
 207         u64 frames_per_ms;
 208         unsigned tmp;
 209
 210         height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
 211         width = mt9v011_read(sd, R04_MT9V011_WIDTH);
 212         hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
 213         vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
 214         speed = mt9v011_read(sd, R0A_MT9V011_CLK_SPEED);
 215
 216         row_time = (width + 113 + hblank) * (speed + 2);
 217         t_time = row_time * (height + vblank + 1);
 218
 219         frames_per_ms = core->xtal * 1000l;
 220         do_div(frames_per_ms, t_time);
 221         tmp = frames_per_ms;
 222
 223         v4l2_dbg(1, debug, sd, "Programmed to %u.%03u fps (%d pixel clcks)\n",
 224                 tmp / 1000, tmp % 1000, t_time);
 225
 226         if (numerator && denominator) {
 227                 *numerator = 1000;
 228                 *denominator = (u32)frames_per_ms;
 229         }
 230 }
 231
 232 static u16 calc_speed(struct v4l2_subdev *sd, u32 numerator, u32 denominator)
 233 {
 234         struct mt9v011 *core = to_mt9v011(sd);
 235         unsigned height, width, hblank, vblank;
 236         unsigned row_time, line_time;
 237         u64 t_time, speed;
 238
 239         /* Avoid bogus calculus */
 240         if (!numerator || !denominator)
 241                 return 0;
 242
 243         height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
 244         width = mt9v011_read(sd, R04_MT9V011_WIDTH);
 245         hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
 246         vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
 247
 248         row_time = width + 113 + hblank;
 249         line_time = height + vblank + 1;
 250
 251         t_time = core->xtal * ((u64)numerator);
 252         /* round to the closest value */
 253         t_time += denominator / 2;
 254         do_div(t_time, denominator);
 255
 256         speed = t_time;
 257         do_div(speed, row_time * line_time);
 258
 259         /* Avoid having a negative value for speed */
 260         if (speed < 2)
 261                 speed = 0;
 262         else
 263                 speed -= 2;
 264
 265         /* Avoid speed overflow */
 266         if (speed > 15)
 267                 return 15;
 268
 269         return (u16)speed;
 270 }
 271
 272 static void set_res(struct v4l2_subdev *sd)
 273 {
 274         struct mt9v011 *core = to_mt9v011(sd);
 275         unsigned vstart, hstart;
 276
 277         /*
 278          * The mt9v011 doesn't have scaling. So, in order to select the desired
 279          * resolution, we're cropping at the middle of the sensor.
 280          * hblank and vblank should be adjusted, in order to warrant that
 281          * we'll preserve the line timings for 30 fps, no matter what resolution
 282          * is selected.
 283          * NOTE: datasheet says that width (and height) should be filled with
 284          * width-1. However, this doesn't work, since one pixel per line will
 285          * be missing.
 286          */
 287
 288         hstart = 20 + (640 - core->width) / 2;
 289         mt9v011_write(sd, R02_MT9V011_COLSTART, hstart);
 290         mt9v011_write(sd, R04_MT9V011_WIDTH, core->width);
 291         mt9v011_write(sd, R05_MT9V011_HBLANK, 771 - core->width);
 292
 293         vstart = 8 + (480 - core->height) / 2;
 294         mt9v011_write(sd, R01_MT9V011_ROWSTART, vstart);
 295         mt9v011_write(sd, R03_MT9V011_HEIGHT, core->height);
 296         mt9v011_write(sd, R06_MT9V011_VBLANK, 508 - core->height);
 297
 298         calc_fps(sd, NULL, NULL);
 299 };
 300
 301 static void set_read_mode(struct v4l2_subdev *sd)
 302 {
 303         struct mt9v011 *core = to_mt9v011(sd);
 304         unsigned mode = 0x1000;
 305
 306         if (core->hflip)
 307                 mode |= 0x4000;
 308
 309         if (core->vflip)
 310                 mode |= 0x8000;
 311
 312         mt9v011_write(sd, R20_MT9V011_READ_MODE, mode);
 313 }
 314
 315 static int mt9v011_reset(struct v4l2_subdev *sd, u32 val)
 316 {
 317         int i;
 318
 319         for (i = 0; i < ARRAY_SIZE(mt9v011_init_default); i++)
 320                 mt9v011_write(sd, mt9v011_init_default[i].reg,
 321                                mt9v011_init_default[i].value);
 322
 323         set_balance(sd);
 324         set_res(sd);
 325         set_read_mode(sd);
 326
 327         return 0;
 328 }
 329
 330 static int mt9v011_enum_mbus_code(struct v4l2_subdev *sd,
 331                 struct v4l2_subdev_pad_config *cfg,
 332                 struct v4l2_subdev_mbus_code_enum *code)
 333 {
 334         if (code->pad || code->index > 0)
 335                 return -EINVAL;
 336
 337         code->code = MEDIA_BUS_FMT_SGRBG8_1X8;
 338         return 0;
 339 }
 340
 341 static int mt9v011_set_fmt(struct v4l2_subdev *sd,
 342                 struct v4l2_subdev_pad_config *cfg,
 343                 struct v4l2_subdev_format *format)
 344 {
 345         struct v4l2_mbus_framefmt *fmt = &format->format;
 346         struct mt9v011 *core = to_mt9v011(sd);
 347
 348         if (format->pad || fmt->code != MEDIA_BUS_FMT_SGRBG8_1X8)
 349                 return -EINVAL;
 350
 351         v4l_bound_align_image(&fmt->width, 48, 639, 1,
 352                               &fmt->height, 32, 480, 1, 0);
 353         fmt->field = V4L2_FIELD_NONE;
 354         fmt->colorspace = V4L2_COLORSPACE_SRGB;
 355
 356         if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
 357                 core->width = fmt->width;
 358                 core->height = fmt->height;
 359
 360                 set_res(sd);
 361         } else {
 362                 cfg->try_fmt = *fmt;
 363         }
 364
 365         return 0;
 366 }
 367
 368 static int mt9v011_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
 369 {
 370         struct v4l2_captureparm *cp = &parms->parm.capture;
 371
 372         if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 373                 return -EINVAL;
 374
 375         memset(cp, 0, sizeof(struct v4l2_captureparm));
 376         cp->capability = V4L2_CAP_TIMEPERFRAME;
 377         calc_fps(sd,
 378                  &cp->timeperframe.numerator,
 379                  &cp->timeperframe.denominator);
 380
 381         return 0;
 382 }
 383
 384 static int mt9v011_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
 385 {
 386         struct v4l2_captureparm *cp = &parms->parm.capture;
 387         struct v4l2_fract *tpf = &cp->timeperframe;
 388         u16 speed;
 389
 390         if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 391                 return -EINVAL;
 392         if (cp->extendedmode != 0)
 393                 return -EINVAL;
 394
 395         speed = calc_speed(sd, tpf->numerator, tpf->denominator);
 396
 397         mt9v011_write(sd, R0A_MT9V011_CLK_SPEED, speed);
 398         v4l2_dbg(1, debug, sd, "Setting speed to %d\n", speed);
 399
 400         /* Recalculate and update fps info */
 401         calc_fps(sd, &tpf->numerator, &tpf->denominator);
 402
 403         return 0;
 404 }
 405
 406 #ifdef CONFIG_VIDEO_ADV_DEBUG
 407 static int mt9v011_g_register(struct v4l2_subdev *sd,
 408                               struct v4l2_dbg_register *reg)
 409 {
 410         reg->val = mt9v011_read(sd, reg->reg & 0xff);
 411         reg->size = 2;
 412
 413         return 0;
 414 }
 415
 416 static int mt9v011_s_register(struct v4l2_subdev *sd,
 417                               const struct v4l2_dbg_register *reg)
 418 {
 419         mt9v011_write(sd, reg->reg & 0xff, reg->val & 0xffff);
 420
 421         return 0;
 422 }
 423 #endif
 424
 425 static int mt9v011_s_ctrl(struct v4l2_ctrl *ctrl)
 426 {
 427         struct mt9v011 *core =
 428                 container_of(ctrl->handler, struct mt9v011, ctrls);
 429         struct v4l2_subdev *sd = &core->sd;
 430
 431         switch (ctrl->id) {
 432         case V4L2_CID_GAIN:
 433                 core->global_gain = ctrl->val;
 434                 break;
 435         case V4L2_CID_EXPOSURE:
 436                 core->exposure = ctrl->val;
 437                 break;
 438         case V4L2_CID_RED_BALANCE:
 439                 core->red_bal = ctrl->val;
 440                 break;
 441         case V4L2_CID_BLUE_BALANCE:
 442                 core->blue_bal = ctrl->val;
 443                 break;
 444         case V4L2_CID_HFLIP:
 445                 core->hflip = ctrl->val;
 446                 set_read_mode(sd);
 447                 return 0;
 448         case V4L2_CID_VFLIP:
 449                 core->vflip = ctrl->val;
 450                 set_read_mode(sd);
 451                 return 0;
 452         default:
 453                 return -EINVAL;
 454         }
 455
 456         set_balance(sd);
 457         return 0;
 458 }
 459
 460 static const struct v4l2_ctrl_ops mt9v011_ctrl_ops = {
 461         .s_ctrl = mt9v011_s_ctrl,
 462 };
 463
 464 static const struct v4l2_subdev_core_ops mt9v011_core_ops = {
 465         .reset = mt9v011_reset,
 466 #ifdef CONFIG_VIDEO_ADV_DEBUG
 467         .g_register = mt9v011_g_register,
 468         .s_register = mt9v011_s_register,
 469 #endif
 470 };
 471
 472 static const struct v4l2_subdev_video_ops mt9v011_video_ops = {
 473         .g_parm = mt9v011_g_parm,
 474         .s_parm = mt9v011_s_parm,
 475 };
 476
 477 static const struct v4l2_subdev_pad_ops mt9v011_pad_ops = {
 478         .enum_mbus_code = mt9v011_enum_mbus_code,
 479         .set_fmt = mt9v011_set_fmt,
 480 };
 481
 482 static const struct v4l2_subdev_ops mt9v011_ops = {
 483         .core  = &mt9v011_core_ops,
 484         .video = &mt9v011_video_ops,
 485         .pad   = &mt9v011_pad_ops,
 486 };
 487
 488
 489 /****************************************************************************
 490                         I2C Client & Driver
 491  ****************************************************************************/
 492
 493 static int mt9v011_probe(struct i2c_client *c,
 494                          const struct i2c_device_id *id)
 495 {
 496         u16 version;
 497         struct mt9v011 *core;
 498         struct v4l2_subdev *sd;
 499 #ifdef CONFIG_MEDIA_CONTROLLER
 500         int ret;
 501 #endif
 502
 503         /* Check if the adapter supports the needed features */
 504         if (!i2c_check_functionality(c->adapter,
 505              I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 506                 return -EIO;
 507
 508         core = devm_kzalloc(&c->dev, sizeof(struct mt9v011), GFP_KERNEL);
 509         if (!core)
 510                 return -ENOMEM;
 511
 512         sd = &core->sd;
 513         v4l2_i2c_subdev_init(sd, c, &mt9v011_ops);
 514
 515 #ifdef CONFIG_MEDIA_CONTROLLER
 516         core->pad.flags = MEDIA_PAD_FL_SOURCE;
 517         sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
 518
 519         ret = media_entity_pads_init(&sd->entity, 1, &core->pad);
 520         if (ret < 0)
 521                 return ret;
 522 #endif
 523
 524         /* Check if the sensor is really a MT9V011 */
 525         version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION);
 526         if ((version != MT9V011_VERSION) &&
 527             (version != MT9V011_REV_B_VERSION)) {
 528                 v4l2_info(sd, "*** unknown micron chip detected (0x%04x).\n",
 529                           version);
 530                 return -EINVAL;
 531         }
 532
 533         v4l2_ctrl_handler_init(&core->ctrls, 5);
 534         v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
 535                           V4L2_CID_GAIN, 0, (1 << 12) - 1 - 0x20, 1, 0x20);
 536         v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
 537                           V4L2_CID_EXPOSURE, 0, 2047, 1, 0x01fc);
 538         v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
 539                           V4L2_CID_RED_BALANCE, -(1 << 9), (1 << 9) - 1, 1, 0);
 540         v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
 541                           V4L2_CID_BLUE_BALANCE, -(1 << 9), (1 << 9) - 1, 1, 0);
 542         v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
 543                           V4L2_CID_HFLIP, 0, 1, 1, 0);
 544         v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
 545                           V4L2_CID_VFLIP, 0, 1, 1, 0);
 546
 547         if (core->ctrls.error) {
 548                 int ret = core->ctrls.error;
 549
 550                 v4l2_err(sd, "control initialization error %d\n", ret);
 551                 v4l2_ctrl_handler_free(&core->ctrls);
 552                 return ret;
 553         }
 554         core->sd.ctrl_handler = &core->ctrls;
 555
 556         core->global_gain = 0x0024;
 557         core->exposure = 0x01fc;
 558         core->width  = 640;
 559         core->height = 480;
 560         core->xtal = 27000000;  /* Hz */
 561
 562         if (c->dev.platform_data) {
 563                 struct mt9v011_platform_data *pdata = c->dev.platform_data;
 564
 565                 core->xtal = pdata->xtal;
 566                 v4l2_dbg(1, debug, sd, "xtal set to %d.%03d MHz\n",
 567                         core->xtal / 1000000, (core->xtal / 1000) % 1000);
 568         }
 569
 570         v4l_info(c, "chip found @ 0x%02x (%s - chip version 0x%04x)\n",
 571                  c->addr << 1, c->adapter->name, version);
 572
 573         return 0;
 574 }
 575
 576 static int mt9v011_remove(struct i2c_client *c)
 577 {
 578         struct v4l2_subdev *sd = i2c_get_clientdata(c);
 579         struct mt9v011 *core = to_mt9v011(sd);
 580
 581         v4l2_dbg(1, debug, sd,
 582                 "mt9v011.c: removing mt9v011 adapter on address 0x%x\n",
 583                 c->addr << 1);
 584
 585         v4l2_device_unregister_subdev(sd);
 586         v4l2_ctrl_handler_free(&core->ctrls);
 587
 588         return 0;
 589 }
 590
 591 /* ----------------------------------------------------------------------- */
 592
 593 static const struct i2c_device_id mt9v011_id[] = {
 594         { "mt9v011", 0 },
 595         { }
 596 };
 597 MODULE_DEVICE_TABLE(i2c, mt9v011_id);
 598
 599 static struct i2c_driver mt9v011_driver = {
 600         .driver = {
 601                 .name   = "mt9v011",
 602         },
 603         .probe          = mt9v011_probe,
 604         .remove         = mt9v011_remove,
 605         .id_table       = mt9v011_id,
 606 };
 607
 608 module_i2c_driver(mt9v011_driver);