mt9t031.c revision 4ec10bacd6bf08de39ebdba9e75060452cc313e0
1/* 2 * Driver for MT9T031 CMOS Image Sensor from Micron 3 * 4 * Copyright (C) 2008, Guennadi Liakhovetski, DENX Software Engineering <lg@denx.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/device.h> 12#include <linux/i2c.h> 13#include <linux/log2.h> 14#include <linux/pm.h> 15#include <linux/slab.h> 16#include <linux/v4l2-mediabus.h> 17#include <linux/videodev2.h> 18#include <linux/module.h> 19 20#include <media/soc_camera.h> 21#include <media/v4l2-chip-ident.h> 22#include <media/v4l2-subdev.h> 23#include <media/v4l2-ctrls.h> 24 25/* 26 * ATTENTION: this driver still cannot be used outside of the soc-camera 27 * framework because of its PM implementation, using the video_device node. 28 * If hardware becomes available for testing, alternative PM approaches shall 29 * be considered and tested. 30 */ 31 32/* 33 * mt9t031 i2c address 0x5d 34 * The platform has to define i2c_board_info and link to it from 35 * struct soc_camera_link 36 */ 37 38/* mt9t031 selected register addresses */ 39#define MT9T031_CHIP_VERSION 0x00 40#define MT9T031_ROW_START 0x01 41#define MT9T031_COLUMN_START 0x02 42#define MT9T031_WINDOW_HEIGHT 0x03 43#define MT9T031_WINDOW_WIDTH 0x04 44#define MT9T031_HORIZONTAL_BLANKING 0x05 45#define MT9T031_VERTICAL_BLANKING 0x06 46#define MT9T031_OUTPUT_CONTROL 0x07 47#define MT9T031_SHUTTER_WIDTH_UPPER 0x08 48#define MT9T031_SHUTTER_WIDTH 0x09 49#define MT9T031_PIXEL_CLOCK_CONTROL 0x0a 50#define MT9T031_FRAME_RESTART 0x0b 51#define MT9T031_SHUTTER_DELAY 0x0c 52#define MT9T031_RESET 0x0d 53#define MT9T031_READ_MODE_1 0x1e 54#define MT9T031_READ_MODE_2 0x20 55#define MT9T031_READ_MODE_3 0x21 56#define MT9T031_ROW_ADDRESS_MODE 0x22 57#define MT9T031_COLUMN_ADDRESS_MODE 0x23 58#define MT9T031_GLOBAL_GAIN 0x35 59#define MT9T031_CHIP_ENABLE 0xF8 60 61#define MT9T031_MAX_HEIGHT 1536 62#define MT9T031_MAX_WIDTH 2048 63#define MT9T031_MIN_HEIGHT 2 64#define MT9T031_MIN_WIDTH 18 65#define MT9T031_HORIZONTAL_BLANK 142 66#define MT9T031_VERTICAL_BLANK 25 67#define MT9T031_COLUMN_SKIP 32 68#define MT9T031_ROW_SKIP 20 69 70struct mt9t031 { 71 struct v4l2_subdev subdev; 72 struct v4l2_ctrl_handler hdl; 73 struct { 74 /* exposure/auto-exposure cluster */ 75 struct v4l2_ctrl *autoexposure; 76 struct v4l2_ctrl *exposure; 77 }; 78 struct v4l2_rect rect; /* Sensor window */ 79 int model; /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */ 80 u16 xskip; 81 u16 yskip; 82 unsigned int total_h; 83 unsigned short y_skip_top; /* Lines to skip at the top */ 84}; 85 86static struct mt9t031 *to_mt9t031(const struct i2c_client *client) 87{ 88 return container_of(i2c_get_clientdata(client), struct mt9t031, subdev); 89} 90 91static int reg_read(struct i2c_client *client, const u8 reg) 92{ 93 return i2c_smbus_read_word_swapped(client, reg); 94} 95 96static int reg_write(struct i2c_client *client, const u8 reg, 97 const u16 data) 98{ 99 return i2c_smbus_write_word_swapped(client, reg, data); 100} 101 102static int reg_set(struct i2c_client *client, const u8 reg, 103 const u16 data) 104{ 105 int ret; 106 107 ret = reg_read(client, reg); 108 if (ret < 0) 109 return ret; 110 return reg_write(client, reg, ret | data); 111} 112 113static int reg_clear(struct i2c_client *client, const u8 reg, 114 const u16 data) 115{ 116 int ret; 117 118 ret = reg_read(client, reg); 119 if (ret < 0) 120 return ret; 121 return reg_write(client, reg, ret & ~data); 122} 123 124static int set_shutter(struct i2c_client *client, const u32 data) 125{ 126 int ret; 127 128 ret = reg_write(client, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16); 129 130 if (ret >= 0) 131 ret = reg_write(client, MT9T031_SHUTTER_WIDTH, data & 0xffff); 132 133 return ret; 134} 135 136static int get_shutter(struct i2c_client *client, u32 *data) 137{ 138 int ret; 139 140 ret = reg_read(client, MT9T031_SHUTTER_WIDTH_UPPER); 141 *data = ret << 16; 142 143 if (ret >= 0) 144 ret = reg_read(client, MT9T031_SHUTTER_WIDTH); 145 *data |= ret & 0xffff; 146 147 return ret < 0 ? ret : 0; 148} 149 150static int mt9t031_idle(struct i2c_client *client) 151{ 152 int ret; 153 154 /* Disable chip output, synchronous option update */ 155 ret = reg_write(client, MT9T031_RESET, 1); 156 if (ret >= 0) 157 ret = reg_write(client, MT9T031_RESET, 0); 158 if (ret >= 0) 159 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2); 160 161 return ret >= 0 ? 0 : -EIO; 162} 163 164static int mt9t031_disable(struct i2c_client *client) 165{ 166 /* Disable the chip */ 167 reg_clear(client, MT9T031_OUTPUT_CONTROL, 2); 168 169 return 0; 170} 171 172static int mt9t031_s_stream(struct v4l2_subdev *sd, int enable) 173{ 174 struct i2c_client *client = v4l2_get_subdevdata(sd); 175 int ret; 176 177 if (enable) 178 /* Switch to master "normal" mode */ 179 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 2); 180 else 181 /* Stop sensor readout */ 182 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2); 183 184 if (ret < 0) 185 return -EIO; 186 187 return 0; 188} 189 190/* target must be _even_ */ 191static u16 mt9t031_skip(s32 *source, s32 target, s32 max) 192{ 193 unsigned int skip; 194 195 if (*source < target + target / 2) { 196 *source = target; 197 return 1; 198 } 199 200 skip = min(max, *source + target / 2) / target; 201 if (skip > 8) 202 skip = 8; 203 *source = target * skip; 204 205 return skip; 206} 207 208/* rect is the sensor rectangle, the caller guarantees parameter validity */ 209static int mt9t031_set_params(struct i2c_client *client, 210 struct v4l2_rect *rect, u16 xskip, u16 yskip) 211{ 212 struct mt9t031 *mt9t031 = to_mt9t031(client); 213 int ret; 214 u16 xbin, ybin; 215 const u16 hblank = MT9T031_HORIZONTAL_BLANK, 216 vblank = MT9T031_VERTICAL_BLANK; 217 218 xbin = min(xskip, (u16)3); 219 ybin = min(yskip, (u16)3); 220 221 /* 222 * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper. 223 * There is always a valid suitably aligned value. The worst case is 224 * xbin = 3, width = 2048. Then we will start at 36, the last read out 225 * pixel will be 2083, which is < 2085 - first black pixel. 226 * 227 * MT9T031 datasheet imposes window left border alignment, depending on 228 * the selected xskip. Failing to conform to this requirement produces 229 * dark horizontal stripes in the image. However, even obeying to this 230 * requirement doesn't eliminate the stripes in all configurations. They 231 * appear "locally reproducibly," but can differ between tests under 232 * different lighting conditions. 233 */ 234 switch (xbin) { 235 case 1: 236 rect->left &= ~1; 237 break; 238 case 2: 239 rect->left &= ~3; 240 break; 241 case 3: 242 rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ? 243 (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6); 244 } 245 246 rect->top &= ~1; 247 248 dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n", 249 xskip, yskip, rect->width, rect->height, rect->left, rect->top); 250 251 /* Disable register update, reconfigure atomically */ 252 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1); 253 if (ret < 0) 254 return ret; 255 256 /* Blanking and start values - default... */ 257 ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank); 258 if (ret >= 0) 259 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank); 260 261 if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) { 262 /* Binning, skipping */ 263 if (ret >= 0) 264 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE, 265 ((xbin - 1) << 4) | (xskip - 1)); 266 if (ret >= 0) 267 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE, 268 ((ybin - 1) << 4) | (yskip - 1)); 269 } 270 dev_dbg(&client->dev, "new physical left %u, top %u\n", 271 rect->left, rect->top); 272 273 /* 274 * The caller provides a supported format, as guaranteed by 275 * .try_mbus_fmt(), soc_camera_s_crop() and soc_camera_cropcap() 276 */ 277 if (ret >= 0) 278 ret = reg_write(client, MT9T031_COLUMN_START, rect->left); 279 if (ret >= 0) 280 ret = reg_write(client, MT9T031_ROW_START, rect->top); 281 if (ret >= 0) 282 ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1); 283 if (ret >= 0) 284 ret = reg_write(client, MT9T031_WINDOW_HEIGHT, 285 rect->height + mt9t031->y_skip_top - 1); 286 if (ret >= 0 && v4l2_ctrl_g_ctrl(mt9t031->autoexposure) == V4L2_EXPOSURE_AUTO) { 287 mt9t031->total_h = rect->height + mt9t031->y_skip_top + vblank; 288 289 ret = set_shutter(client, mt9t031->total_h); 290 } 291 292 /* Re-enable register update, commit all changes */ 293 if (ret >= 0) 294 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1); 295 296 if (ret >= 0) { 297 mt9t031->rect = *rect; 298 mt9t031->xskip = xskip; 299 mt9t031->yskip = yskip; 300 } 301 302 return ret < 0 ? ret : 0; 303} 304 305static int mt9t031_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a) 306{ 307 struct v4l2_rect rect = a->c; 308 struct i2c_client *client = v4l2_get_subdevdata(sd); 309 struct mt9t031 *mt9t031 = to_mt9t031(client); 310 311 rect.width = ALIGN(rect.width, 2); 312 rect.height = ALIGN(rect.height, 2); 313 314 soc_camera_limit_side(&rect.left, &rect.width, 315 MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH); 316 317 soc_camera_limit_side(&rect.top, &rect.height, 318 MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT); 319 320 return mt9t031_set_params(client, &rect, mt9t031->xskip, mt9t031->yskip); 321} 322 323static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a) 324{ 325 struct i2c_client *client = v4l2_get_subdevdata(sd); 326 struct mt9t031 *mt9t031 = to_mt9t031(client); 327 328 a->c = mt9t031->rect; 329 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 330 331 return 0; 332} 333 334static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a) 335{ 336 a->bounds.left = MT9T031_COLUMN_SKIP; 337 a->bounds.top = MT9T031_ROW_SKIP; 338 a->bounds.width = MT9T031_MAX_WIDTH; 339 a->bounds.height = MT9T031_MAX_HEIGHT; 340 a->defrect = a->bounds; 341 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 342 a->pixelaspect.numerator = 1; 343 a->pixelaspect.denominator = 1; 344 345 return 0; 346} 347 348static int mt9t031_g_fmt(struct v4l2_subdev *sd, 349 struct v4l2_mbus_framefmt *mf) 350{ 351 struct i2c_client *client = v4l2_get_subdevdata(sd); 352 struct mt9t031 *mt9t031 = to_mt9t031(client); 353 354 mf->width = mt9t031->rect.width / mt9t031->xskip; 355 mf->height = mt9t031->rect.height / mt9t031->yskip; 356 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10; 357 mf->colorspace = V4L2_COLORSPACE_SRGB; 358 mf->field = V4L2_FIELD_NONE; 359 360 return 0; 361} 362 363static int mt9t031_s_fmt(struct v4l2_subdev *sd, 364 struct v4l2_mbus_framefmt *mf) 365{ 366 struct i2c_client *client = v4l2_get_subdevdata(sd); 367 struct mt9t031 *mt9t031 = to_mt9t031(client); 368 u16 xskip, yskip; 369 struct v4l2_rect rect = mt9t031->rect; 370 371 /* 372 * try_fmt has put width and height within limits. 373 * S_FMT: use binning and skipping for scaling 374 */ 375 xskip = mt9t031_skip(&rect.width, mf->width, MT9T031_MAX_WIDTH); 376 yskip = mt9t031_skip(&rect.height, mf->height, MT9T031_MAX_HEIGHT); 377 378 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10; 379 mf->colorspace = V4L2_COLORSPACE_SRGB; 380 381 /* mt9t031_set_params() doesn't change width and height */ 382 return mt9t031_set_params(client, &rect, xskip, yskip); 383} 384 385/* 386 * If a user window larger than sensor window is requested, we'll increase the 387 * sensor window. 388 */ 389static int mt9t031_try_fmt(struct v4l2_subdev *sd, 390 struct v4l2_mbus_framefmt *mf) 391{ 392 v4l_bound_align_image( 393 &mf->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1, 394 &mf->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0); 395 396 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10; 397 mf->colorspace = V4L2_COLORSPACE_SRGB; 398 399 return 0; 400} 401 402static int mt9t031_g_chip_ident(struct v4l2_subdev *sd, 403 struct v4l2_dbg_chip_ident *id) 404{ 405 struct i2c_client *client = v4l2_get_subdevdata(sd); 406 struct mt9t031 *mt9t031 = to_mt9t031(client); 407 408 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR) 409 return -EINVAL; 410 411 if (id->match.addr != client->addr) 412 return -ENODEV; 413 414 id->ident = mt9t031->model; 415 id->revision = 0; 416 417 return 0; 418} 419 420#ifdef CONFIG_VIDEO_ADV_DEBUG 421static int mt9t031_g_register(struct v4l2_subdev *sd, 422 struct v4l2_dbg_register *reg) 423{ 424 struct i2c_client *client = v4l2_get_subdevdata(sd); 425 426 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) 427 return -EINVAL; 428 429 if (reg->match.addr != client->addr) 430 return -ENODEV; 431 432 reg->val = reg_read(client, reg->reg); 433 434 if (reg->val > 0xffff) 435 return -EIO; 436 437 return 0; 438} 439 440static int mt9t031_s_register(struct v4l2_subdev *sd, 441 struct v4l2_dbg_register *reg) 442{ 443 struct i2c_client *client = v4l2_get_subdevdata(sd); 444 445 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) 446 return -EINVAL; 447 448 if (reg->match.addr != client->addr) 449 return -ENODEV; 450 451 if (reg_write(client, reg->reg, reg->val) < 0) 452 return -EIO; 453 454 return 0; 455} 456#endif 457 458static int mt9t031_g_volatile_ctrl(struct v4l2_ctrl *ctrl) 459{ 460 struct mt9t031 *mt9t031 = container_of(ctrl->handler, 461 struct mt9t031, hdl); 462 const u32 shutter_max = MT9T031_MAX_HEIGHT + MT9T031_VERTICAL_BLANK; 463 s32 min, max; 464 465 switch (ctrl->id) { 466 case V4L2_CID_EXPOSURE_AUTO: 467 min = mt9t031->exposure->minimum; 468 max = mt9t031->exposure->maximum; 469 mt9t031->exposure->val = 470 (shutter_max / 2 + (mt9t031->total_h - 1) * (max - min)) 471 / shutter_max + min; 472 break; 473 } 474 return 0; 475} 476 477static int mt9t031_s_ctrl(struct v4l2_ctrl *ctrl) 478{ 479 struct mt9t031 *mt9t031 = container_of(ctrl->handler, 480 struct mt9t031, hdl); 481 struct v4l2_subdev *sd = &mt9t031->subdev; 482 struct i2c_client *client = v4l2_get_subdevdata(sd); 483 struct v4l2_ctrl *exp = mt9t031->exposure; 484 int data; 485 486 switch (ctrl->id) { 487 case V4L2_CID_VFLIP: 488 if (ctrl->val) 489 data = reg_set(client, MT9T031_READ_MODE_2, 0x8000); 490 else 491 data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000); 492 if (data < 0) 493 return -EIO; 494 return 0; 495 case V4L2_CID_HFLIP: 496 if (ctrl->val) 497 data = reg_set(client, MT9T031_READ_MODE_2, 0x4000); 498 else 499 data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000); 500 if (data < 0) 501 return -EIO; 502 return 0; 503 case V4L2_CID_GAIN: 504 /* See Datasheet Table 7, Gain settings. */ 505 if (ctrl->val <= ctrl->default_value) { 506 /* Pack it into 0..1 step 0.125, register values 0..8 */ 507 unsigned long range = ctrl->default_value - ctrl->minimum; 508 data = ((ctrl->val - ctrl->minimum) * 8 + range / 2) / range; 509 510 dev_dbg(&client->dev, "Setting gain %d\n", data); 511 data = reg_write(client, MT9T031_GLOBAL_GAIN, data); 512 if (data < 0) 513 return -EIO; 514 } else { 515 /* Pack it into 1.125..128 variable step, register values 9..0x7860 */ 516 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */ 517 unsigned long range = ctrl->maximum - ctrl->default_value - 1; 518 /* calculated gain: map 65..127 to 9..1024 step 0.125 */ 519 unsigned long gain = ((ctrl->val - ctrl->default_value - 1) * 520 1015 + range / 2) / range + 9; 521 522 if (gain <= 32) /* calculated gain 9..32 -> 9..32 */ 523 data = gain; 524 else if (gain <= 64) /* calculated gain 33..64 -> 0x51..0x60 */ 525 data = ((gain - 32) * 16 + 16) / 32 + 80; 526 else 527 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */ 528 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60; 529 530 dev_dbg(&client->dev, "Set gain from 0x%x to 0x%x\n", 531 reg_read(client, MT9T031_GLOBAL_GAIN), data); 532 data = reg_write(client, MT9T031_GLOBAL_GAIN, data); 533 if (data < 0) 534 return -EIO; 535 } 536 return 0; 537 538 case V4L2_CID_EXPOSURE_AUTO: 539 if (ctrl->val == V4L2_EXPOSURE_MANUAL) { 540 unsigned int range = exp->maximum - exp->minimum; 541 unsigned int shutter = ((exp->val - exp->minimum) * 1048 + 542 range / 2) / range + 1; 543 u32 old; 544 545 get_shutter(client, &old); 546 dev_dbg(&client->dev, "Set shutter from %u to %u\n", 547 old, shutter); 548 if (set_shutter(client, shutter) < 0) 549 return -EIO; 550 } else { 551 const u16 vblank = MT9T031_VERTICAL_BLANK; 552 mt9t031->total_h = mt9t031->rect.height + 553 mt9t031->y_skip_top + vblank; 554 555 if (set_shutter(client, mt9t031->total_h) < 0) 556 return -EIO; 557 } 558 return 0; 559 default: 560 return -EINVAL; 561 } 562 return 0; 563} 564 565/* 566 * Power Management: 567 * This function does nothing for now but must be present for pm to work 568 */ 569static int mt9t031_runtime_suspend(struct device *dev) 570{ 571 return 0; 572} 573 574/* 575 * Power Management: 576 * COLUMN_ADDRESS_MODE and ROW_ADDRESS_MODE are not rewritten if unchanged 577 * they are however changed at reset if the platform hook is present 578 * thus we rewrite them with the values stored by the driver 579 */ 580static int mt9t031_runtime_resume(struct device *dev) 581{ 582 struct video_device *vdev = to_video_device(dev); 583 struct v4l2_subdev *sd = soc_camera_vdev_to_subdev(vdev); 584 struct i2c_client *client = v4l2_get_subdevdata(sd); 585 struct mt9t031 *mt9t031 = to_mt9t031(client); 586 587 int ret; 588 u16 xbin, ybin; 589 590 xbin = min(mt9t031->xskip, (u16)3); 591 ybin = min(mt9t031->yskip, (u16)3); 592 593 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE, 594 ((xbin - 1) << 4) | (mt9t031->xskip - 1)); 595 if (ret < 0) 596 return ret; 597 598 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE, 599 ((ybin - 1) << 4) | (mt9t031->yskip - 1)); 600 if (ret < 0) 601 return ret; 602 603 return 0; 604} 605 606static struct dev_pm_ops mt9t031_dev_pm_ops = { 607 .runtime_suspend = mt9t031_runtime_suspend, 608 .runtime_resume = mt9t031_runtime_resume, 609}; 610 611static struct device_type mt9t031_dev_type = { 612 .name = "MT9T031", 613 .pm = &mt9t031_dev_pm_ops, 614}; 615 616static int mt9t031_s_power(struct v4l2_subdev *sd, int on) 617{ 618 struct i2c_client *client = v4l2_get_subdevdata(sd); 619 struct soc_camera_link *icl = soc_camera_i2c_to_link(client); 620 struct video_device *vdev = soc_camera_i2c_to_vdev(client); 621 int ret; 622 623 if (on) { 624 ret = soc_camera_power_on(&client->dev, icl); 625 if (ret < 0) 626 return ret; 627 vdev->dev.type = &mt9t031_dev_type; 628 } else { 629 vdev->dev.type = NULL; 630 soc_camera_power_off(&client->dev, icl); 631 } 632 633 return 0; 634} 635 636/* 637 * Interface active, can use i2c. If it fails, it can indeed mean, that 638 * this wasn't our capture interface, so, we wait for the right one 639 */ 640static int mt9t031_video_probe(struct i2c_client *client) 641{ 642 struct mt9t031 *mt9t031 = to_mt9t031(client); 643 s32 data; 644 int ret; 645 646 /* Enable the chip */ 647 data = reg_write(client, MT9T031_CHIP_ENABLE, 1); 648 dev_dbg(&client->dev, "write: %d\n", data); 649 650 /* Read out the chip version register */ 651 data = reg_read(client, MT9T031_CHIP_VERSION); 652 653 switch (data) { 654 case 0x1621: 655 mt9t031->model = V4L2_IDENT_MT9T031; 656 break; 657 default: 658 dev_err(&client->dev, 659 "No MT9T031 chip detected, register read %x\n", data); 660 return -ENODEV; 661 } 662 663 dev_info(&client->dev, "Detected a MT9T031 chip ID %x\n", data); 664 665 ret = mt9t031_idle(client); 666 if (ret < 0) 667 dev_err(&client->dev, "Failed to initialise the camera\n"); 668 else 669 v4l2_ctrl_handler_setup(&mt9t031->hdl); 670 671 return ret; 672} 673 674static int mt9t031_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines) 675{ 676 struct i2c_client *client = v4l2_get_subdevdata(sd); 677 struct mt9t031 *mt9t031 = to_mt9t031(client); 678 679 *lines = mt9t031->y_skip_top; 680 681 return 0; 682} 683 684static const struct v4l2_ctrl_ops mt9t031_ctrl_ops = { 685 .g_volatile_ctrl = mt9t031_g_volatile_ctrl, 686 .s_ctrl = mt9t031_s_ctrl, 687}; 688 689static struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = { 690 .g_chip_ident = mt9t031_g_chip_ident, 691 .s_power = mt9t031_s_power, 692#ifdef CONFIG_VIDEO_ADV_DEBUG 693 .g_register = mt9t031_g_register, 694 .s_register = mt9t031_s_register, 695#endif 696}; 697 698static int mt9t031_enum_fmt(struct v4l2_subdev *sd, unsigned int index, 699 enum v4l2_mbus_pixelcode *code) 700{ 701 if (index) 702 return -EINVAL; 703 704 *code = V4L2_MBUS_FMT_SBGGR10_1X10; 705 return 0; 706} 707 708static int mt9t031_g_mbus_config(struct v4l2_subdev *sd, 709 struct v4l2_mbus_config *cfg) 710{ 711 struct i2c_client *client = v4l2_get_subdevdata(sd); 712 struct soc_camera_link *icl = soc_camera_i2c_to_link(client); 713 714 cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_PCLK_SAMPLE_RISING | 715 V4L2_MBUS_PCLK_SAMPLE_FALLING | V4L2_MBUS_HSYNC_ACTIVE_HIGH | 716 V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_HIGH; 717 cfg->type = V4L2_MBUS_PARALLEL; 718 cfg->flags = soc_camera_apply_board_flags(icl, cfg); 719 720 return 0; 721} 722 723static int mt9t031_s_mbus_config(struct v4l2_subdev *sd, 724 const struct v4l2_mbus_config *cfg) 725{ 726 struct i2c_client *client = v4l2_get_subdevdata(sd); 727 struct soc_camera_link *icl = soc_camera_i2c_to_link(client); 728 729 if (soc_camera_apply_board_flags(icl, cfg) & 730 V4L2_MBUS_PCLK_SAMPLE_FALLING) 731 return reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000); 732 else 733 return reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000); 734} 735 736static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = { 737 .s_stream = mt9t031_s_stream, 738 .s_mbus_fmt = mt9t031_s_fmt, 739 .g_mbus_fmt = mt9t031_g_fmt, 740 .try_mbus_fmt = mt9t031_try_fmt, 741 .s_crop = mt9t031_s_crop, 742 .g_crop = mt9t031_g_crop, 743 .cropcap = mt9t031_cropcap, 744 .enum_mbus_fmt = mt9t031_enum_fmt, 745 .g_mbus_config = mt9t031_g_mbus_config, 746 .s_mbus_config = mt9t031_s_mbus_config, 747}; 748 749static struct v4l2_subdev_sensor_ops mt9t031_subdev_sensor_ops = { 750 .g_skip_top_lines = mt9t031_g_skip_top_lines, 751}; 752 753static struct v4l2_subdev_ops mt9t031_subdev_ops = { 754 .core = &mt9t031_subdev_core_ops, 755 .video = &mt9t031_subdev_video_ops, 756 .sensor = &mt9t031_subdev_sensor_ops, 757}; 758 759static int mt9t031_probe(struct i2c_client *client, 760 const struct i2c_device_id *did) 761{ 762 struct mt9t031 *mt9t031; 763 struct soc_camera_link *icl = soc_camera_i2c_to_link(client); 764 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); 765 int ret; 766 767 if (!icl) { 768 dev_err(&client->dev, "MT9T031 driver needs platform data\n"); 769 return -EINVAL; 770 } 771 772 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) { 773 dev_warn(&adapter->dev, 774 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); 775 return -EIO; 776 } 777 778 mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL); 779 if (!mt9t031) 780 return -ENOMEM; 781 782 v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops); 783 v4l2_ctrl_handler_init(&mt9t031->hdl, 5); 784 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops, 785 V4L2_CID_VFLIP, 0, 1, 1, 0); 786 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops, 787 V4L2_CID_HFLIP, 0, 1, 1, 0); 788 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops, 789 V4L2_CID_GAIN, 0, 127, 1, 64); 790 791 /* 792 * Simulated autoexposure. If enabled, we calculate shutter width 793 * ourselves in the driver based on vertical blanking and frame width 794 */ 795 mt9t031->autoexposure = v4l2_ctrl_new_std_menu(&mt9t031->hdl, 796 &mt9t031_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0, 797 V4L2_EXPOSURE_AUTO); 798 mt9t031->exposure = v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops, 799 V4L2_CID_EXPOSURE, 1, 255, 1, 255); 800 801 mt9t031->subdev.ctrl_handler = &mt9t031->hdl; 802 if (mt9t031->hdl.error) { 803 int err = mt9t031->hdl.error; 804 805 kfree(mt9t031); 806 return err; 807 } 808 v4l2_ctrl_auto_cluster(2, &mt9t031->autoexposure, 809 V4L2_EXPOSURE_MANUAL, true); 810 811 mt9t031->y_skip_top = 0; 812 mt9t031->rect.left = MT9T031_COLUMN_SKIP; 813 mt9t031->rect.top = MT9T031_ROW_SKIP; 814 mt9t031->rect.width = MT9T031_MAX_WIDTH; 815 mt9t031->rect.height = MT9T031_MAX_HEIGHT; 816 817 mt9t031->xskip = 1; 818 mt9t031->yskip = 1; 819 820 mt9t031_idle(client); 821 822 ret = mt9t031_video_probe(client); 823 824 mt9t031_disable(client); 825 826 if (ret) { 827 v4l2_ctrl_handler_free(&mt9t031->hdl); 828 kfree(mt9t031); 829 } 830 831 return ret; 832} 833 834static int mt9t031_remove(struct i2c_client *client) 835{ 836 struct mt9t031 *mt9t031 = to_mt9t031(client); 837 838 v4l2_device_unregister_subdev(&mt9t031->subdev); 839 v4l2_ctrl_handler_free(&mt9t031->hdl); 840 kfree(mt9t031); 841 842 return 0; 843} 844 845static const struct i2c_device_id mt9t031_id[] = { 846 { "mt9t031", 0 }, 847 { } 848}; 849MODULE_DEVICE_TABLE(i2c, mt9t031_id); 850 851static struct i2c_driver mt9t031_i2c_driver = { 852 .driver = { 853 .name = "mt9t031", 854 }, 855 .probe = mt9t031_probe, 856 .remove = mt9t031_remove, 857 .id_table = mt9t031_id, 858}; 859 860module_i2c_driver(mt9t031_i2c_driver); 861 862MODULE_DESCRIPTION("Micron MT9T031 Camera driver"); 863MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>"); 864MODULE_LICENSE("GPL v2"); 865