drivers/media/i2c/mt9v011.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // mt9v011 -Micron 1/4-Inch VGA Digital Image Sensor
   4 //
   5 // Copyright (c) 2009 Mauro Carvalho Chehab <mchehab@kernel.org>
   6
   7 #include <linux/i2c.h>
   8 #include <linux/slab.h>
   9 #include <linux/videodev2.h>
  10 #include <linux/delay.h>
  11 #include <linux/module.h>
  12 #include <asm/div64.h>
  13 #include <media/v4l2-device.h>
  14 #include <media/v4l2-ctrls.h>
  15 #include <media/i2c/mt9v011.h>
  16
  17 MODULE_DESCRIPTION("Micron mt9v011 sensor driver");
  18 MODULE_AUTHOR("Mauro Carvalho Chehab");
  19 MODULE_LICENSE("GPL v2");
  20
  21 static int debug;
  22 module_param(debug, int, 0);
  23 MODULE_PARM_DESC(debug, "Debug level (0-2)");
  24
  25 #define R00_MT9V011_CHIP_VERSION        0x00
  26 #define R01_MT9V011_ROWSTART            0x01
  27 #define R02_MT9V011_COLSTART            0x02
  28 #define R03_MT9V011_HEIGHT              0x03
  29 #define R04_MT9V011_WIDTH               0x04
  30 #define R05_MT9V011_HBLANK              0x05
  31 #define R06_MT9V011_VBLANK              0x06
  32 #define R07_MT9V011_OUT_CTRL            0x07
  33 #define R09_MT9V011_SHUTTER_WIDTH       0x09
  34 #define R0A_MT9V011_CLK_SPEED           0x0a
  35 #define R0B_MT9V011_RESTART             0x0b
  36 #define R0C_MT9V011_SHUTTER_DELAY       0x0c
  37 #define R0D_MT9V011_RESET               0x0d
  38 #define R1E_MT9V011_DIGITAL_ZOOM        0x1e
  39 #define R20_MT9V011_READ_MODE           0x20
  40 #define R2B_MT9V011_GREEN_1_GAIN        0x2b
  41 #define R2C_MT9V011_BLUE_GAIN           0x2c
  42 #define R2D_MT9V011_RED_GAIN            0x2d
  43 #define R2E_MT9V011_GREEN_2_GAIN        0x2e
  44 #define R35_MT9V011_GLOBAL_GAIN         0x35
  45 #define RF1_MT9V011_CHIP_ENABLE         0xf1
  46
  47 #define MT9V011_VERSION                 0x8232
  48 #define MT9V011_REV_B_VERSION           0x8243
  49
  50 struct mt9v011 {
  51         struct v4l2_subdev sd;
  52 #ifdef CONFIG_MEDIA_CONTROLLER
  53         struct media_pad pad;
  54 #endif
  55         struct v4l2_ctrl_handler ctrls;
  56         unsigned width, height;
  57         unsigned xtal;
  58         unsigned hflip:1;
  59         unsigned vflip:1;
  60
  61         u16 global_gain, exposure;
  62         s16 red_bal, blue_bal;
  63 };
  64
  65 static inline struct mt9v011 *to_mt9v011(struct v4l2_subdev *sd)
  66 {
  67         return container_of(sd, struct mt9v011, sd);
  68 }
  69
  70 static int mt9v011_read(struct v4l2_subdev *sd, unsigned char addr)
  71 {
  72         struct i2c_client *c = v4l2_get_subdevdata(sd);
  73         __be16 buffer;
  74         int rc, val;
  75
  76         rc = i2c_master_send(c, &addr, 1);
  77         if (rc != 1)
  78                 v4l2_dbg(0, debug, sd,
  79                          "i2c i/o error: rc == %d (should be 1)\n", rc);
  80
  81         msleep(10);
  82
  83         rc = i2c_master_recv(c, (char *)&buffer, 2);
  84         if (rc != 2)
  85                 v4l2_dbg(0, debug, sd,
  86                          "i2c i/o error: rc == %d (should be 2)\n", rc);
  87
  88         val = be16_to_cpu(buffer);
  89
  90         v4l2_dbg(2, debug, sd, "mt9v011: read 0x%02x = 0x%04x\n", addr, val);
  91
  92         return val;
  93 }
  94
  95 static void mt9v011_write(struct v4l2_subdev *sd, unsigned char addr,
  96                                  u16 value)
  97 {
  98         struct i2c_client *c = v4l2_get_subdevdata(sd);
  99         unsigned char buffer[3];
 100         int rc;
 101
 102         buffer[0] = addr;
 103         buffer[1] = value >> 8;
 104         buffer[2] = value & 0xff;
 105
 106         v4l2_dbg(2, debug, sd,
 107                  "mt9v011: writing 0x%02x 0x%04x\n", buffer[0], value);
 108         rc = i2c_master_send(c, buffer, 3);
 109         if (rc != 3)
 110                 v4l2_dbg(0, debug, sd,
 111                          "i2c i/o error: rc == %d (should be 3)\n", rc);
 112 }
 113
 114
 115 struct i2c_reg_value {
 116         unsigned char reg;
 117         u16           value;
 118 };
 119
 120 /*
 121  * Values used at the original driver
 122  * Some values are marked as Reserved at the datasheet
 123  */
 124 static const struct i2c_reg_value mt9v011_init_default[] = {
 125                 { R0D_MT9V011_RESET, 0x0001 },
 126                 { R0D_MT9V011_RESET, 0x0000 },
 127
 128                 { R0C_MT9V011_SHUTTER_DELAY, 0x0000 },
 129                 { R09_MT9V011_SHUTTER_WIDTH, 0x1fc },
 130
 131                 { R0A_MT9V011_CLK_SPEED, 0x0000 },
 132                 { R1E_MT9V011_DIGITAL_ZOOM,  0x0000 },
 133
 134                 { R07_MT9V011_OUT_CTRL, 0x0002 },       /* chip enable */
 135 };
 136
 137
 138 static u16 calc_mt9v011_gain(s16 lineargain)
 139 {
 140
 141         u16 digitalgain = 0;
 142         u16 analogmult = 0;
 143         u16 analoginit = 0;
 144
 145         if (lineargain < 0)
 146                 lineargain = 0;
 147
 148         /* recommended minimum */
 149         lineargain += 0x0020;
 150
 151         if (lineargain > 2047)
 152                 lineargain = 2047;
 153
 154         if (lineargain > 1023) {
 155                 digitalgain = 3;
 156                 analogmult = 3;
 157                 analoginit = lineargain / 16;
 158         } else if (lineargain > 511) {
 159                 digitalgain = 1;
 160                 analogmult = 3;
 161                 analoginit = lineargain / 8;
 162         } else if (lineargain > 255) {
 163                 analogmult = 3;
 164                 analoginit = lineargain / 4;
 165         } else if (lineargain > 127) {
 166                 analogmult = 1;
 167                 analoginit = lineargain / 2;
 168         } else
 169                 analoginit = lineargain;
 170
 171         return analoginit + (analogmult << 7) + (digitalgain << 9);
 172
 173 }
 174
 175 static void set_balance(struct v4l2_subdev *sd)
 176 {
 177         struct mt9v011 *core = to_mt9v011(sd);
 178         u16 green_gain, blue_gain, red_gain;
 179         u16 exposure;
 180         s16 bal;
 181
 182         exposure = core->exposure;
 183
 184         green_gain = calc_mt9v011_gain(core->global_gain);
 185
 186         bal = core->global_gain;
 187         bal += (core->blue_bal * core->global_gain / (1 << 7));
 188         blue_gain = calc_mt9v011_gain(bal);
 189
 190         bal = core->global_gain;
 191         bal += (core->red_bal * core->global_gain / (1 << 7));
 192         red_gain = calc_mt9v011_gain(bal);
 193
 194         mt9v011_write(sd, R2B_MT9V011_GREEN_1_GAIN, green_gain);
 195         mt9v011_write(sd, R2E_MT9V011_GREEN_2_GAIN, green_gain);
 196         mt9v011_write(sd, R2C_MT9V011_BLUE_GAIN, blue_gain);
 197         mt9v011_write(sd, R2D_MT9V011_RED_GAIN, red_gain);
 198         mt9v011_write(sd, R09_MT9V011_SHUTTER_WIDTH, exposure);
 199 }
 200
 201 static void calc_fps(struct v4l2_subdev *sd, u32 *numerator, u32 *denominator)
 202 {
 203         struct mt9v011 *core = to_mt9v011(sd);
 204         unsigned height, width, hblank, vblank, speed;
 205         unsigned row_time, t_time;
 206         u64 frames_per_ms;
 207         unsigned tmp;
 208
 209         height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
 210         width = mt9v011_read(sd, R04_MT9V011_WIDTH);
 211         hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
 212         vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
 213         speed = mt9v011_read(sd, R0A_MT9V011_CLK_SPEED);
 214
 215         row_time = (width + 113 + hblank) * (speed + 2);
 216         t_time = row_time * (height + vblank + 1);
 217
 218         frames_per_ms = core->xtal * 1000l;
 219         do_div(frames_per_ms, t_time);
 220         tmp = frames_per_ms;
 221
 222         v4l2_dbg(1, debug, sd, "Programmed to %u.%03u fps (%d pixel clcks)\n",
 223                 tmp / 1000, tmp % 1000, t_time);
 224
 225         if (numerator && denominator) {
 226                 *numerator = 1000;
 227                 *denominator = (u32)frames_per_ms;
 228         }
 229 }
 230
 231 static u16 calc_speed(struct v4l2_subdev *sd, u32 numerator, u32 denominator)
 232 {
 233         struct mt9v011 *core = to_mt9v011(sd);
 234         unsigned height, width, hblank, vblank;
 235         unsigned row_time, line_time;
 236         u64 t_time, speed;
 237
 238         /* Avoid bogus calculus */
 239         if (!numerator || !denominator)
 240                 return 0;
 241
 242         height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
 243         width = mt9v011_read(sd, R04_MT9V011_WIDTH);
 244         hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
 245         vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
 246
 247         row_time = width + 113 + hblank;
 248         line_time = height + vblank + 1;
 249
 250         t_time = core->xtal * ((u64)numerator);
 251         /* round to the closest value */
 252         t_time += denominator / 2;
 253         do_div(t_time, denominator);
 254
 255         speed = t_time;
 256         do_div(speed, row_time * line_time);
 257
 258         /* Avoid having a negative value for speed */
 259         if (speed < 2)
 260                 speed = 0;
 261         else
 262                 speed -= 2;
 263
 264         /* Avoid speed overflow */
 265         if (speed > 15)
 266                 return 15;
 267
 268         return (u16)speed;
 269 }
 270
 271 static void set_res(struct v4l2_subdev *sd)
 272 {
 273         struct mt9v011 *core = to_mt9v011(sd);
 274         unsigned vstart, hstart;
 275
 276         /*
 277          * The mt9v011 doesn't have scaling. So, in order to select the desired
 278          * resolution, we're cropping at the middle of the sensor.
 279          * hblank and vblank should be adjusted, in order to warrant that
 280          * we'll preserve the line timings for 30 fps, no matter what resolution
 281          * is selected.
 282          * NOTE: datasheet says that width (and height) should be filled with
 283          * width-1. However, this doesn't work, since one pixel per line will
 284          * be missing.
 285          */
 286
 287         hstart = 20 + (640 - core->width) / 2;
 288         mt9v011_write(sd, R02_MT9V011_COLSTART, hstart);
 289         mt9v011_write(sd, R04_MT9V011_WIDTH, core->width);
 290         mt9v011_write(sd, R05_MT9V011_HBLANK, 771 - core->width);
 291
 292         vstart = 8 + (480 - core->height) / 2;
 293         mt9v011_write(sd, R01_MT9V011_ROWSTART, vstart);
 294         mt9v011_write(sd, R03_MT9V011_HEIGHT, core->height);
 295         mt9v011_write(sd, R06_MT9V011_VBLANK, 508 - core->height);
 296
 297         calc_fps(sd, NULL, NULL);
 298 };
 299
 300 static void set_read_mode(struct v4l2_subdev *sd)
 301 {
 302         struct mt9v011 *core = to_mt9v011(sd);
 303         unsigned mode = 0x1000;
 304
 305         if (core->hflip)
 306                 mode |= 0x4000;
 307
 308         if (core->vflip)
 309                 mode |= 0x8000;
 310
 311         mt9v011_write(sd, R20_MT9V011_READ_MODE, mode);
 312 }
 313
 314 static int mt9v011_reset(struct v4l2_subdev *sd, u32 val)
 315 {
 316         int i;
 317
 318         for (i = 0; i < ARRAY_SIZE(mt9v011_init_default); i++)
 319                 mt9v011_write(sd, mt9v011_init_default[i].reg,
 320                                mt9v011_init_default[i].value);
 321
 322         set_balance(sd);
 323         set_res(sd);
 324         set_read_mode(sd);
 325
 326         return 0;
 327 }
 328
 329 static int mt9v011_enum_mbus_code(struct v4l2_subdev *sd,
 330                 struct v4l2_subdev_pad_config *cfg,
 331                 struct v4l2_subdev_mbus_code_enum *code)
 332 {
 333         if (code->pad || code->index > 0)
 334                 return -EINVAL;
 335
 336         code->code = MEDIA_BUS_FMT_SGRBG8_1X8;
 337         return 0;
 338 }
 339
 340 static int mt9v011_set_fmt(struct v4l2_subdev *sd,
 341                 struct v4l2_subdev_pad_config *cfg,
 342                 struct v4l2_subdev_format *format)
 343 {
 344         struct v4l2_mbus_framefmt *fmt = &format->format;
 345         struct mt9v011 *core = to_mt9v011(sd);
 346
 347         if (format->pad || fmt->code != MEDIA_BUS_FMT_SGRBG8_1X8)
 348                 return -EINVAL;
 349
 350         v4l_bound_align_image(&fmt->width, 48, 639, 1,
 351                               &fmt->height, 32, 480, 1, 0);
 352         fmt->field = V4L2_FIELD_NONE;
 353         fmt->colorspace = V4L2_COLORSPACE_SRGB;
 354
 355         if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
 356                 core->width = fmt->width;
 357                 core->height = fmt->height;
 358
 359                 set_res(sd);
 360         } else {
 361                 cfg->try_fmt = *fmt;
 362         }
 363
 364         return 0;
 365 }
 366
 367 static int mt9v011_g_frame_interval(struct v4l2_subdev *sd,
 368                                     struct v4l2_subdev_frame_interval *ival)
 369 {
 370         calc_fps(sd,
 371                  &ival->interval.numerator,
 372                  &ival->interval.denominator);
 373
 374         return 0;
 375 }
 376
 377 static int mt9v011_s_frame_interval(struct v4l2_subdev *sd,
 378                                     struct v4l2_subdev_frame_interval *ival)
 379 {
 380         struct v4l2_fract *tpf = &ival->interval;
 381         u16 speed;
 382
 383         speed = calc_speed(sd, tpf->numerator, tpf->denominator);
 384
 385         mt9v011_write(sd, R0A_MT9V011_CLK_SPEED, speed);
 386         v4l2_dbg(1, debug, sd, "Setting speed to %d\n", speed);
 387
 388         /* Recalculate and update fps info */
 389         calc_fps(sd, &tpf->numerator, &tpf->denominator);
 390
 391         return 0;
 392 }
 393
 394 #ifdef CONFIG_VIDEO_ADV_DEBUG
 395 static int mt9v011_g_register(struct v4l2_subdev *sd,
 396                               struct v4l2_dbg_register *reg)
 397 {
 398         reg->val = mt9v011_read(sd, reg->reg & 0xff);
 399         reg->size = 2;
 400
 401         return 0;
 402 }
 403
 404 static int mt9v011_s_register(struct v4l2_subdev *sd,
 405                               const struct v4l2_dbg_register *reg)
 406 {
 407         mt9v011_write(sd, reg->reg & 0xff, reg->val & 0xffff);
 408
 409         return 0;
 410 }
 411 #endif
 412
 413 static int mt9v011_s_ctrl(struct v4l2_ctrl *ctrl)
 414 {
 415         struct mt9v011 *core =
 416                 container_of(ctrl->handler, struct mt9v011, ctrls);
 417         struct v4l2_subdev *sd = &core->sd;
 418
 419         switch (ctrl->id) {
 420         case V4L2_CID_GAIN:
 421                 core->global_gain = ctrl->val;
 422                 break;
 423         case V4L2_CID_EXPOSURE:
 424                 core->exposure = ctrl->val;
 425                 break;
 426         case V4L2_CID_RED_BALANCE:
 427                 core->red_bal = ctrl->val;
 428                 break;
 429         case V4L2_CID_BLUE_BALANCE:
 430                 core->blue_bal = ctrl->val;
 431                 break;
 432         case V4L2_CID_HFLIP:
 433                 core->hflip = ctrl->val;
 434                 set_read_mode(sd);
 435                 return 0;
 436         case V4L2_CID_VFLIP:
 437                 core->vflip = ctrl->val;
 438                 set_read_mode(sd);
 439                 return 0;
 440         default:
 441                 return -EINVAL;
 442         }
 443
 444         set_balance(sd);
 445         return 0;
 446 }
 447
 448 static const struct v4l2_ctrl_ops mt9v011_ctrl_ops = {
 449         .s_ctrl = mt9v011_s_ctrl,
 450 };
 451
 452 static const struct v4l2_subdev_core_ops mt9v011_core_ops = {
 453         .reset = mt9v011_reset,
 454 #ifdef CONFIG_VIDEO_ADV_DEBUG
 455         .g_register = mt9v011_g_register,
 456         .s_register = mt9v011_s_register,
 457 #endif
 458 };
 459
 460 static const struct v4l2_subdev_video_ops mt9v011_video_ops = {
 461         .g_frame_interval = mt9v011_g_frame_interval,
 462         .s_frame_interval = mt9v011_s_frame_interval,
 463 };
 464
 465 static const struct v4l2_subdev_pad_ops mt9v011_pad_ops = {
 466         .enum_mbus_code = mt9v011_enum_mbus_code,
 467         .set_fmt = mt9v011_set_fmt,
 468 };
 469
 470 static const struct v4l2_subdev_ops mt9v011_ops = {
 471         .core  = &mt9v011_core_ops,
 472         .video = &mt9v011_video_ops,
 473         .pad   = &mt9v011_pad_ops,
 474 };
 475
 476
 477 /****************************************************************************
 478                         I2C Client & Driver
 479  ****************************************************************************/
 480
 481 static int mt9v011_probe(struct i2c_client *c,
 482                          const struct i2c_device_id *id)
 483 {
 484         u16 version;
 485         struct mt9v011 *core;
 486         struct v4l2_subdev *sd;
 487 #ifdef CONFIG_MEDIA_CONTROLLER
 488         int ret;
 489 #endif
 490
 491         /* Check if the adapter supports the needed features */
 492         if (!i2c_check_functionality(c->adapter,
 493              I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 494                 return -EIO;
 495
 496         core = devm_kzalloc(&c->dev, sizeof(struct mt9v011), GFP_KERNEL);
 497         if (!core)
 498                 return -ENOMEM;
 499
 500         sd = &core->sd;
 501         v4l2_i2c_subdev_init(sd, c, &mt9v011_ops);
 502
 503 #ifdef CONFIG_MEDIA_CONTROLLER
 504         core->pad.flags = MEDIA_PAD_FL_SOURCE;
 505         sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
 506
 507         ret = media_entity_pads_init(&sd->entity, 1, &core->pad);
 508         if (ret < 0)
 509                 return ret;
 510 #endif
 511
 512         /* Check if the sensor is really a MT9V011 */
 513         version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION);
 514         if ((version != MT9V011_VERSION) &&
 515             (version != MT9V011_REV_B_VERSION)) {
 516                 v4l2_info(sd, "*** unknown micron chip detected (0x%04x).\n",
 517                           version);
 518                 return -EINVAL;
 519         }
 520
 521         v4l2_ctrl_handler_init(&core->ctrls, 5);
 522         v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
 523                           V4L2_CID_GAIN, 0, (1 << 12) - 1 - 0x20, 1, 0x20);
 524         v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
 525                           V4L2_CID_EXPOSURE, 0, 2047, 1, 0x01fc);
 526         v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
 527                           V4L2_CID_RED_BALANCE, -(1 << 9), (1 << 9) - 1, 1, 0);
 528         v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
 529                           V4L2_CID_BLUE_BALANCE, -(1 << 9), (1 << 9) - 1, 1, 0);
 530         v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
 531                           V4L2_CID_HFLIP, 0, 1, 1, 0);
 532         v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
 533                           V4L2_CID_VFLIP, 0, 1, 1, 0);
 534
 535         if (core->ctrls.error) {
 536                 int ret = core->ctrls.error;
 537
 538                 v4l2_err(sd, "control initialization error %d\n", ret);
 539                 v4l2_ctrl_handler_free(&core->ctrls);
 540                 return ret;
 541         }
 542         core->sd.ctrl_handler = &core->ctrls;
 543
 544         core->global_gain = 0x0024;
 545         core->exposure = 0x01fc;
 546         core->width  = 640;
 547         core->height = 480;
 548         core->xtal = 27000000;  /* Hz */
 549
 550         if (c->dev.platform_data) {
 551                 struct mt9v011_platform_data *pdata = c->dev.platform_data;
 552
 553                 core->xtal = pdata->xtal;
 554                 v4l2_dbg(1, debug, sd, "xtal set to %d.%03d MHz\n",
 555                         core->xtal / 1000000, (core->xtal / 1000) % 1000);
 556         }
 557
 558         v4l_info(c, "chip found @ 0x%02x (%s - chip version 0x%04x)\n",
 559                  c->addr << 1, c->adapter->name, version);
 560
 561         return 0;
 562 }
 563
 564 static int mt9v011_remove(struct i2c_client *c)
 565 {
 566         struct v4l2_subdev *sd = i2c_get_clientdata(c);
 567         struct mt9v011 *core = to_mt9v011(sd);
 568
 569         v4l2_dbg(1, debug, sd,
 570                 "mt9v011.c: removing mt9v011 adapter on address 0x%x\n",
 571                 c->addr << 1);
 572
 573         v4l2_device_unregister_subdev(sd);
 574         v4l2_ctrl_handler_free(&core->ctrls);
 575
 576         return 0;
 577 }
 578
 579 /* ----------------------------------------------------------------------- */
 580
 581 static const struct i2c_device_id mt9v011_id[] = {
 582         { "mt9v011", 0 },
 583         { }
 584 };
 585 MODULE_DEVICE_TABLE(i2c, mt9v011_id);
 586
 587 static struct i2c_driver mt9v011_driver = {
 588         .driver = {
 589                 .name   = "mt9v011",
 590         },
 591         .probe          = mt9v011_probe,
 592         .remove         = mt9v011_remove,
 593         .id_table       = mt9v011_id,
 594 };
 595
 596 module_i2c_driver(mt9v011_driver);