drivers/media/video/mt9v011.c

   1 /*
   2  * mt9v011 -Micron 1/4-Inch VGA Digital Image Sensor
   3  *
   4  * Copyright (c) 2009 Mauro Carvalho Chehab (mchehab@redhat.com)
   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/videodev2.h>
  10 #include <linux/delay.h>
  11 #include <asm/div64.h>
  12 #include <media/v4l2-device.h>
  13 #include "mt9v011.h"
  14 #include <media/v4l2-i2c-drv.h>
  15 #include <media/v4l2-chip-ident.h>
  16
  17 MODULE_DESCRIPTION("Micron mt9v011 sensor driver");
  18 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
  19 MODULE_LICENSE("GPL");
  20
  21
  22 static int debug;
  23 module_param(debug, int, 0);
  24 MODULE_PARM_DESC(debug, "Debug level (0-2)");
  25
  26 /* supported controls */
  27 static struct v4l2_queryctrl mt9v011_qctrl[] = {
  28         {
  29                 .id = V4L2_CID_GAIN,
  30                 .type = V4L2_CTRL_TYPE_INTEGER,
  31                 .name = "Gain",
  32                 .minimum = 0,
  33                 .maximum = (1 << 10) - 1,
  34                 .step = 1,
  35                 .default_value = 0x0020,
  36                 .flags = 0,
  37         }, {
  38                 .id = V4L2_CID_RED_BALANCE,
  39                 .type = V4L2_CTRL_TYPE_INTEGER,
  40                 .name = "Red Balance",
  41                 .minimum = -1 << 9,
  42                 .maximum = (1 << 9) - 1,
  43                 .step = 1,
  44                 .default_value = 0,
  45                 .flags = 0,
  46         }, {
  47                 .id = V4L2_CID_BLUE_BALANCE,
  48                 .type = V4L2_CTRL_TYPE_INTEGER,
  49                 .name = "Blue Balance",
  50                 .minimum = -1 << 9,
  51                 .maximum = (1 << 9) - 1,
  52                 .step = 1,
  53                 .default_value = 0,
  54                 .flags = 0,
  55         }, {
  56                 .id      = V4L2_CID_HFLIP,
  57                 .type    = V4L2_CTRL_TYPE_BOOLEAN,
  58                 .name    = "Mirror",
  59                 .minimum = 0,
  60                 .maximum = 1,
  61                 .step    = 1,
  62                 .default_value = 0,
  63                 .flags = 0,
  64         }, {
  65                 .id      = V4L2_CID_VFLIP,
  66                 .type    = V4L2_CTRL_TYPE_BOOLEAN,
  67                 .name    = "Vflip",
  68                 .minimum = 0,
  69                 .maximum = 1,
  70                 .step    = 1,
  71                 .default_value = 0,
  72                 .flags = 0,
  73         }, {
  74         }
  75 };
  76
  77 struct mt9v011 {
  78         struct v4l2_subdev sd;
  79         unsigned width, height;
  80         unsigned xtal;
  81         unsigned hflip:1;
  82         unsigned vflip:1;
  83
  84         u16 global_gain, red_bal, blue_bal;
  85 };
  86
  87 static inline struct mt9v011 *to_mt9v011(struct v4l2_subdev *sd)
  88 {
  89         return container_of(sd, struct mt9v011, sd);
  90 }
  91
  92 static int mt9v011_read(struct v4l2_subdev *sd, unsigned char addr)
  93 {
  94         struct i2c_client *c = v4l2_get_subdevdata(sd);
  95         __be16 buffer;
  96         int rc, val;
  97
  98         rc = i2c_master_send(c, &addr, 1);
  99         if (rc != 1)
 100                 v4l2_dbg(0, debug, sd,
 101                          "i2c i/o error: rc == %d (should be 1)\n", rc);
 102
 103         msleep(10);
 104
 105         rc = i2c_master_recv(c, (char *)&buffer, 2);
 106         if (rc != 2)
 107                 v4l2_dbg(0, debug, sd,
 108                          "i2c i/o error: rc == %d (should be 2)\n", rc);
 109
 110         val = be16_to_cpu(buffer);
 111
 112         v4l2_dbg(2, debug, sd, "mt9v011: read 0x%02x = 0x%04x\n", addr, val);
 113
 114         return val;
 115 }
 116
 117 static void mt9v011_write(struct v4l2_subdev *sd, unsigned char addr,
 118                                  u16 value)
 119 {
 120         struct i2c_client *c = v4l2_get_subdevdata(sd);
 121         unsigned char buffer[3];
 122         int rc;
 123
 124         buffer[0] = addr;
 125         buffer[1] = value >> 8;
 126         buffer[2] = value & 0xff;
 127
 128         v4l2_dbg(2, debug, sd,
 129                  "mt9v011: writing 0x%02x 0x%04x\n", buffer[0], value);
 130         rc = i2c_master_send(c, buffer, 3);
 131         if (rc != 3)
 132                 v4l2_dbg(0, debug, sd,
 133                          "i2c i/o error: rc == %d (should be 3)\n", rc);
 134 }
 135
 136
 137 struct i2c_reg_value {
 138         unsigned char reg;
 139         u16           value;
 140 };
 141
 142 /*
 143  * Values used at the original driver
 144  * Some values are marked as Reserved at the datasheet
 145  */
 146 static const struct i2c_reg_value mt9v011_init_default[] = {
 147                 { R0D_MT9V011_RESET, 0x0001 },
 148                 { R0D_MT9V011_RESET, 0x0000 },
 149
 150                 { R0C_MT9V011_SHUTTER_DELAY, 0x0000 },
 151                 { R09_MT9V011_SHUTTER_WIDTH, 0x1fc },
 152
 153                 { R0A_MT9V011_CLK_SPEED, 0x0000 },
 154                 { R1E_MT9V011_DIGITAL_ZOOM,  0x0000 },
 155
 156                 { R07_MT9V011_OUT_CTRL, 0x0002 },       /* chip enable */
 157 };
 158
 159 static void set_balance(struct v4l2_subdev *sd)
 160 {
 161         struct mt9v011 *core = to_mt9v011(sd);
 162         u16 green1_gain, green2_gain, blue_gain, red_gain;
 163
 164         green1_gain = core->global_gain;
 165         green2_gain = core->global_gain;
 166
 167         blue_gain = core->global_gain +
 168                     core->global_gain * core->blue_bal / (1 << 9);
 169
 170         red_gain = core->global_gain +
 171                    core->global_gain * core->blue_bal / (1 << 9);
 172
 173         mt9v011_write(sd, R2B_MT9V011_GREEN_1_GAIN, green1_gain);
 174         mt9v011_write(sd, R2E_MT9V011_GREEN_2_GAIN,  green1_gain);
 175         mt9v011_write(sd, R2C_MT9V011_BLUE_GAIN, blue_gain);
 176         mt9v011_write(sd, R2D_MT9V011_RED_GAIN, red_gain);
 177 }
 178
 179 static void calc_fps(struct v4l2_subdev *sd, u32 *numerator, u32 *denominator)
 180 {
 181         struct mt9v011 *core = to_mt9v011(sd);
 182         unsigned height, width, hblank, vblank, speed;
 183         unsigned row_time, t_time;
 184         u64 frames_per_ms;
 185         unsigned tmp;
 186
 187         height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
 188         width = mt9v011_read(sd, R04_MT9V011_WIDTH);
 189         hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
 190         vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
 191         speed = mt9v011_read(sd, R0A_MT9V011_CLK_SPEED);
 192
 193         row_time = (width + 113 + hblank) * (speed + 2);
 194         t_time = row_time * (height + vblank + 1);
 195
 196         frames_per_ms = core->xtal * 1000l;
 197         do_div(frames_per_ms, t_time);
 198         tmp = frames_per_ms;
 199
 200         v4l2_dbg(1, debug, sd, "Programmed to %u.%03u fps (%d pixel clcks)\n",
 201                 tmp / 1000, tmp % 1000, t_time);
 202
 203         if (numerator && denominator) {
 204                 *numerator = 1000;
 205                 *denominator = (u32)frames_per_ms;
 206         }
 207 }
 208
 209 static u16 calc_speed(struct v4l2_subdev *sd, u32 numerator, u32 denominator)
 210 {
 211         struct mt9v011 *core = to_mt9v011(sd);
 212         unsigned height, width, hblank, vblank;
 213         unsigned row_time, line_time;
 214         u64 t_time, speed;
 215
 216         /* Avoid bogus calculus */
 217         if (!numerator || !denominator)
 218                 return 0;
 219
 220         height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
 221         width = mt9v011_read(sd, R04_MT9V011_WIDTH);
 222         hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
 223         vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
 224
 225         row_time = width + 113 + hblank;
 226         line_time = height + vblank + 1;
 227
 228         t_time = core->xtal * ((u64)numerator);
 229         /* round to the closest value */
 230         t_time += denominator / 2;
 231         do_div(t_time, denominator);
 232
 233         speed = t_time;
 234         do_div(speed, row_time * line_time);
 235
 236         /* Avoid having a negative value for speed */
 237         if (speed < 2)
 238                 speed = 0;
 239         else
 240                 speed -= 2;
 241
 242         /* Avoid speed overflow */
 243         if (speed > 15)
 244                 return 15;
 245
 246         return (u16)speed;
 247 }
 248
 249 static void set_res(struct v4l2_subdev *sd)
 250 {
 251         struct mt9v011 *core = to_mt9v011(sd);
 252         unsigned vstart, hstart;
 253
 254         /*
 255          * The mt9v011 doesn't have scaling. So, in order to select the desired
 256          * resolution, we're cropping at the middle of the sensor.
 257          * hblank and vblank should be adjusted, in order to warrant that
 258          * we'll preserve the line timings for 30 fps, no matter what resolution
 259          * is selected.
 260          * NOTE: datasheet says that width (and height) should be filled with
 261          * width-1. However, this doesn't work, since one pixel per line will
 262          * be missing.
 263          */
 264
 265         hstart = 14 + (640 - core->width) / 2;
 266         mt9v011_write(sd, R02_MT9V011_COLSTART, hstart);
 267         mt9v011_write(sd, R04_MT9V011_WIDTH, core->width);
 268         mt9v011_write(sd, R05_MT9V011_HBLANK, 771 - core->width);
 269
 270         vstart = 8 + (480 - core->height) / 2;
 271         mt9v011_write(sd, R01_MT9V011_ROWSTART, vstart);
 272         mt9v011_write(sd, R03_MT9V011_HEIGHT, core->height);
 273         mt9v011_write(sd, R06_MT9V011_VBLANK, 508 - core->height);
 274
 275         calc_fps(sd, NULL, NULL);
 276 };
 277
 278 static void set_read_mode(struct v4l2_subdev *sd)
 279 {
 280         struct mt9v011 *core = to_mt9v011(sd);
 281         unsigned mode = 0x1000;
 282
 283         if (core->hflip)
 284                 mode |= 0x4000;
 285
 286         if (core->vflip)
 287                 mode |= 0x8000;
 288
 289         mt9v011_write(sd, R20_MT9V011_READ_MODE, mode);
 290 }
 291
 292 static int mt9v011_reset(struct v4l2_subdev *sd, u32 val)
 293 {
 294         int i;
 295
 296         for (i = 0; i < ARRAY_SIZE(mt9v011_init_default); i++)
 297                 mt9v011_write(sd, mt9v011_init_default[i].reg,
 298                                mt9v011_init_default[i].value);
 299
 300         set_balance(sd);
 301         set_res(sd);
 302         set_read_mode(sd);
 303
 304         return 0;
 305 };
 306
 307 static int mt9v011_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 308 {
 309         struct mt9v011 *core = to_mt9v011(sd);
 310
 311         v4l2_dbg(1, debug, sd, "g_ctrl called\n");
 312
 313         switch (ctrl->id) {
 314         case V4L2_CID_GAIN:
 315                 ctrl->value = core->global_gain;
 316                 return 0;
 317         case V4L2_CID_RED_BALANCE:
 318                 ctrl->value = core->red_bal;
 319                 return 0;
 320         case V4L2_CID_BLUE_BALANCE:
 321                 ctrl->value = core->blue_bal;
 322                 return 0;
 323         case V4L2_CID_HFLIP:
 324                 ctrl->value = core->hflip ? 1 : 0;
 325                 return 0;
 326         case V4L2_CID_VFLIP:
 327                 ctrl->value = core->vflip ? 1 : 0;
 328                 return 0;
 329         }
 330         return -EINVAL;
 331 }
 332
 333 static int mt9v011_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
 334 {
 335         int i;
 336
 337         v4l2_dbg(1, debug, sd, "queryctrl called\n");
 338
 339         for (i = 0; i < ARRAY_SIZE(mt9v011_qctrl); i++)
 340                 if (qc->id && qc->id == mt9v011_qctrl[i].id) {
 341                         memcpy(qc, &(mt9v011_qctrl[i]),
 342                                sizeof(*qc));
 343                         return 0;
 344                 }
 345
 346         return -EINVAL;
 347 }
 348
 349
 350 static int mt9v011_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 351 {
 352         struct mt9v011 *core = to_mt9v011(sd);
 353         u8 i, n;
 354         n = ARRAY_SIZE(mt9v011_qctrl);
 355
 356         for (i = 0; i < n; i++) {
 357                 if (ctrl->id != mt9v011_qctrl[i].id)
 358                         continue;
 359                 if (ctrl->value < mt9v011_qctrl[i].minimum ||
 360                     ctrl->value > mt9v011_qctrl[i].maximum)
 361                         return -ERANGE;
 362                 v4l2_dbg(1, debug, sd, "s_ctrl: id=%d, value=%d\n",
 363                                         ctrl->id, ctrl->value);
 364                 break;
 365         }
 366
 367         switch (ctrl->id) {
 368         case V4L2_CID_GAIN:
 369                 core->global_gain = ctrl->value;
 370                 break;
 371         case V4L2_CID_RED_BALANCE:
 372                 core->red_bal = ctrl->value;
 373                 break;
 374         case V4L2_CID_BLUE_BALANCE:
 375                 core->blue_bal = ctrl->value;
 376                 break;
 377         case V4L2_CID_HFLIP:
 378                 core->hflip = ctrl->value;
 379                 set_read_mode(sd);
 380                 return 0;
 381         case V4L2_CID_VFLIP:
 382                 core->vflip = ctrl->value;
 383                 set_read_mode(sd);
 384                 return 0;
 385         default:
 386                 return -EINVAL;
 387         }
 388
 389         set_balance(sd);
 390
 391         return 0;
 392 }
 393
 394 static int mt9v011_enum_fmt(struct v4l2_subdev *sd, struct v4l2_fmtdesc *fmt)
 395 {
 396         if (fmt->index > 0)
 397                 return -EINVAL;
 398
 399         fmt->flags = 0;
 400         strcpy(fmt->description, "8 bpp Bayer GRGR..BGBG");
 401         fmt->pixelformat = V4L2_PIX_FMT_SGRBG8;
 402
 403         return 0;
 404 }
 405
 406 static int mt9v011_try_fmt(struct v4l2_subdev *sd, struct v4l2_format *fmt)
 407 {
 408         struct v4l2_pix_format *pix = &fmt->fmt.pix;
 409
 410         if (pix->pixelformat != V4L2_PIX_FMT_SGRBG8)
 411                 return -EINVAL;
 412
 413         v4l_bound_align_image(&pix->width, 48, 639, 1,
 414                               &pix->height, 32, 480, 1, 0);
 415
 416         return 0;
 417 }
 418
 419 static int mt9v011_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
 420 {
 421         struct v4l2_captureparm *cp = &parms->parm.capture;
 422
 423         if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 424                 return -EINVAL;
 425
 426         memset(cp, 0, sizeof(struct v4l2_captureparm));
 427         cp->capability = V4L2_CAP_TIMEPERFRAME;
 428         calc_fps(sd,
 429                  &cp->timeperframe.numerator,
 430                  &cp->timeperframe.denominator);
 431
 432         return 0;
 433 }
 434
 435 static int mt9v011_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
 436 {
 437         struct v4l2_captureparm *cp = &parms->parm.capture;
 438         struct v4l2_fract *tpf = &cp->timeperframe;
 439         u16 speed;
 440
 441         if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 442                 return -EINVAL;
 443         if (cp->extendedmode != 0)
 444                 return -EINVAL;
 445
 446         speed = calc_speed(sd, tpf->numerator, tpf->denominator);
 447
 448         mt9v011_write(sd, R0A_MT9V011_CLK_SPEED, speed);
 449         v4l2_dbg(1, debug, sd, "Setting speed to %d\n", speed);
 450
 451         /* Recalculate and update fps info */
 452         calc_fps(sd, &tpf->numerator, &tpf->denominator);
 453
 454         return 0;
 455 }
 456
 457 static int mt9v011_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *fmt)
 458 {
 459         struct v4l2_pix_format *pix = &fmt->fmt.pix;
 460         struct mt9v011 *core = to_mt9v011(sd);
 461         int rc;
 462
 463         rc = mt9v011_try_fmt(sd, fmt);
 464         if (rc < 0)
 465                 return -EINVAL;
 466
 467         core->width = pix->width;
 468         core->height = pix->height;
 469
 470         set_res(sd);
 471
 472         return 0;
 473 }
 474
 475 static int mt9v011_s_config(struct v4l2_subdev *sd, int dumb, void *data)
 476 {
 477         struct mt9v011 *core = to_mt9v011(sd);
 478         unsigned *xtal = data;
 479
 480         v4l2_dbg(1, debug, sd, "s_config called\n");
 481
 482         if (xtal) {
 483                 core->xtal = *xtal;
 484                 v4l2_dbg(1, debug, sd, "xtal set to %d.%03d MHz\n",
 485                          *xtal / 1000000, (*xtal / 1000) % 1000);
 486         }
 487
 488         return 0;
 489 }
 490
 491
 492 #ifdef CONFIG_VIDEO_ADV_DEBUG
 493 static int mt9v011_g_register(struct v4l2_subdev *sd,
 494                               struct v4l2_dbg_register *reg)
 495 {
 496         struct i2c_client *client = v4l2_get_subdevdata(sd);
 497
 498         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 499                 return -EINVAL;
 500         if (!capable(CAP_SYS_ADMIN))
 501                 return -EPERM;
 502
 503         reg->val = mt9v011_read(sd, reg->reg & 0xff);
 504         reg->size = 2;
 505
 506         return 0;
 507 }
 508
 509 static int mt9v011_s_register(struct v4l2_subdev *sd,
 510                               struct v4l2_dbg_register *reg)
 511 {
 512         struct i2c_client *client = v4l2_get_subdevdata(sd);
 513
 514         if (!v4l2_chip_match_i2c_client(client, &reg->match))
 515                 return -EINVAL;
 516         if (!capable(CAP_SYS_ADMIN))
 517                 return -EPERM;
 518
 519         mt9v011_write(sd, reg->reg & 0xff, reg->val & 0xffff);
 520
 521         return 0;
 522 }
 523 #endif
 524
 525 static int mt9v011_g_chip_ident(struct v4l2_subdev *sd,
 526                                 struct v4l2_dbg_chip_ident *chip)
 527 {
 528         u16 version;
 529         struct i2c_client *client = v4l2_get_subdevdata(sd);
 530
 531         version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION);
 532
 533         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_MT9V011,
 534                                           version);
 535 }
 536
 537 static const struct v4l2_subdev_core_ops mt9v011_core_ops = {
 538         .queryctrl = mt9v011_queryctrl,
 539         .g_ctrl = mt9v011_g_ctrl,
 540         .s_ctrl = mt9v011_s_ctrl,
 541         .reset = mt9v011_reset,
 542         .s_config = mt9v011_s_config,
 543         .g_chip_ident = mt9v011_g_chip_ident,
 544 #ifdef CONFIG_VIDEO_ADV_DEBUG
 545         .g_register = mt9v011_g_register,
 546         .s_register = mt9v011_s_register,
 547 #endif
 548 };
 549
 550 static const struct v4l2_subdev_video_ops mt9v011_video_ops = {
 551         .enum_fmt = mt9v011_enum_fmt,
 552         .try_fmt = mt9v011_try_fmt,
 553         .s_fmt = mt9v011_s_fmt,
 554         .g_parm = mt9v011_g_parm,
 555         .s_parm = mt9v011_s_parm,
 556 };
 557
 558 static const struct v4l2_subdev_ops mt9v011_ops = {
 559         .core  = &mt9v011_core_ops,
 560         .video = &mt9v011_video_ops,
 561 };
 562
 563
 564 /****************************************************************************
 565                         I2C Client & Driver
 566  ****************************************************************************/
 567
 568 static int mt9v011_probe(struct i2c_client *c,
 569                          const struct i2c_device_id *id)
 570 {
 571         u16 version;
 572         struct mt9v011 *core;
 573         struct v4l2_subdev *sd;
 574
 575         /* Check if the adapter supports the needed features */
 576         if (!i2c_check_functionality(c->adapter,
 577              I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 578                 return -EIO;
 579
 580         core = kzalloc(sizeof(struct mt9v011), GFP_KERNEL);
 581         if (!core)
 582                 return -ENOMEM;
 583
 584         sd = &core->sd;
 585         v4l2_i2c_subdev_init(sd, c, &mt9v011_ops);
 586
 587         /* Check if the sensor is really a MT9V011 */
 588         version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION);
 589         if ((version != MT9V011_VERSION) &&
 590             (version != MT9V011_REV_B_VERSION)) {
 591                 v4l2_info(sd, "*** unknown micron chip detected (0x%04x).\n",
 592                           version);
 593                 kfree(core);
 594                 return -EINVAL;
 595         }
 596
 597         core->global_gain = 0x0024;
 598         core->width  = 640;
 599         core->height = 480;
 600         core->xtal = 27000000;  /* Hz */
 601
 602         v4l_info(c, "chip found @ 0x%02x (%s - chip version 0x%04x)\n",
 603                  c->addr << 1, c->adapter->name, version);
 604
 605         return 0;
 606 }
 607
 608 static int mt9v011_remove(struct i2c_client *c)
 609 {
 610         struct v4l2_subdev *sd = i2c_get_clientdata(c);
 611
 612         v4l2_dbg(1, debug, sd,
 613                 "mt9v011.c: removing mt9v011 adapter on address 0x%x\n",
 614                 c->addr << 1);
 615
 616         v4l2_device_unregister_subdev(sd);
 617         kfree(to_mt9v011(sd));
 618         return 0;
 619 }
 620
 621 /* ----------------------------------------------------------------------- */
 622
 623 static const struct i2c_device_id mt9v011_id[] = {
 624         { "mt9v011", 0 },
 625         { }
 626 };
 627 MODULE_DEVICE_TABLE(i2c, mt9v011_id);
 628
 629 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 630         .name = "mt9v011",
 631         .probe = mt9v011_probe,
 632         .remove = mt9v011_remove,
 633         .id_table = mt9v011_id,
 634 };