mt9t031.c revision 70e176a5a9839ea22f0fbcfa21d1c8ae952a0dd2
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 struct i2c_board_info objects and link to them 35 * from struct soc_camera_host_desc 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_s_stream(struct v4l2_subdev *sd, int enable) 165{ 166 struct i2c_client *client = v4l2_get_subdevdata(sd); 167 int ret; 168 169 if (enable) 170 /* Switch to master "normal" mode */ 171 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 2); 172 else 173 /* Stop sensor readout */ 174 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 2); 175 176 if (ret < 0) 177 return -EIO; 178 179 return 0; 180} 181 182/* target must be _even_ */ 183static u16 mt9t031_skip(s32 *source, s32 target, s32 max) 184{ 185 unsigned int skip; 186 187 if (*source < target + target / 2) { 188 *source = target; 189 return 1; 190 } 191 192 skip = min(max, *source + target / 2) / target; 193 if (skip > 8) 194 skip = 8; 195 *source = target * skip; 196 197 return skip; 198} 199 200/* rect is the sensor rectangle, the caller guarantees parameter validity */ 201static int mt9t031_set_params(struct i2c_client *client, 202 struct v4l2_rect *rect, u16 xskip, u16 yskip) 203{ 204 struct mt9t031 *mt9t031 = to_mt9t031(client); 205 int ret; 206 u16 xbin, ybin; 207 const u16 hblank = MT9T031_HORIZONTAL_BLANK, 208 vblank = MT9T031_VERTICAL_BLANK; 209 210 xbin = min(xskip, (u16)3); 211 ybin = min(yskip, (u16)3); 212 213 /* 214 * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper. 215 * There is always a valid suitably aligned value. The worst case is 216 * xbin = 3, width = 2048. Then we will start at 36, the last read out 217 * pixel will be 2083, which is < 2085 - first black pixel. 218 * 219 * MT9T031 datasheet imposes window left border alignment, depending on 220 * the selected xskip. Failing to conform to this requirement produces 221 * dark horizontal stripes in the image. However, even obeying to this 222 * requirement doesn't eliminate the stripes in all configurations. They 223 * appear "locally reproducibly," but can differ between tests under 224 * different lighting conditions. 225 */ 226 switch (xbin) { 227 case 1: 228 rect->left &= ~1; 229 break; 230 case 2: 231 rect->left &= ~3; 232 break; 233 case 3: 234 rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ? 235 (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6); 236 } 237 238 rect->top &= ~1; 239 240 dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n", 241 xskip, yskip, rect->width, rect->height, rect->left, rect->top); 242 243 /* Disable register update, reconfigure atomically */ 244 ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1); 245 if (ret < 0) 246 return ret; 247 248 /* Blanking and start values - default... */ 249 ret = reg_write(client, MT9T031_HORIZONTAL_BLANKING, hblank); 250 if (ret >= 0) 251 ret = reg_write(client, MT9T031_VERTICAL_BLANKING, vblank); 252 253 if (yskip != mt9t031->yskip || xskip != mt9t031->xskip) { 254 /* Binning, skipping */ 255 if (ret >= 0) 256 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE, 257 ((xbin - 1) << 4) | (xskip - 1)); 258 if (ret >= 0) 259 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE, 260 ((ybin - 1) << 4) | (yskip - 1)); 261 } 262 dev_dbg(&client->dev, "new physical left %u, top %u\n", 263 rect->left, rect->top); 264 265 /* 266 * The caller provides a supported format, as guaranteed by 267 * .try_mbus_fmt(), soc_camera_s_crop() and soc_camera_cropcap() 268 */ 269 if (ret >= 0) 270 ret = reg_write(client, MT9T031_COLUMN_START, rect->left); 271 if (ret >= 0) 272 ret = reg_write(client, MT9T031_ROW_START, rect->top); 273 if (ret >= 0) 274 ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1); 275 if (ret >= 0) 276 ret = reg_write(client, MT9T031_WINDOW_HEIGHT, 277 rect->height + mt9t031->y_skip_top - 1); 278 if (ret >= 0 && v4l2_ctrl_g_ctrl(mt9t031->autoexposure) == V4L2_EXPOSURE_AUTO) { 279 mt9t031->total_h = rect->height + mt9t031->y_skip_top + vblank; 280 281 ret = set_shutter(client, mt9t031->total_h); 282 } 283 284 /* Re-enable register update, commit all changes */ 285 if (ret >= 0) 286 ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1); 287 288 if (ret >= 0) { 289 mt9t031->rect = *rect; 290 mt9t031->xskip = xskip; 291 mt9t031->yskip = yskip; 292 } 293 294 return ret < 0 ? ret : 0; 295} 296 297static int mt9t031_s_crop(struct v4l2_subdev *sd, const struct v4l2_crop *a) 298{ 299 struct v4l2_rect rect = a->c; 300 struct i2c_client *client = v4l2_get_subdevdata(sd); 301 struct mt9t031 *mt9t031 = to_mt9t031(client); 302 303 rect.width = ALIGN(rect.width, 2); 304 rect.height = ALIGN(rect.height, 2); 305 306 soc_camera_limit_side(&rect.left, &rect.width, 307 MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH); 308 309 soc_camera_limit_side(&rect.top, &rect.height, 310 MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT); 311 312 return mt9t031_set_params(client, &rect, mt9t031->xskip, mt9t031->yskip); 313} 314 315static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a) 316{ 317 struct i2c_client *client = v4l2_get_subdevdata(sd); 318 struct mt9t031 *mt9t031 = to_mt9t031(client); 319 320 a->c = mt9t031->rect; 321 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 322 323 return 0; 324} 325 326static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a) 327{ 328 a->bounds.left = MT9T031_COLUMN_SKIP; 329 a->bounds.top = MT9T031_ROW_SKIP; 330 a->bounds.width = MT9T031_MAX_WIDTH; 331 a->bounds.height = MT9T031_MAX_HEIGHT; 332 a->defrect = a->bounds; 333 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 334 a->pixelaspect.numerator = 1; 335 a->pixelaspect.denominator = 1; 336 337 return 0; 338} 339 340static int mt9t031_g_fmt(struct v4l2_subdev *sd, 341 struct v4l2_mbus_framefmt *mf) 342{ 343 struct i2c_client *client = v4l2_get_subdevdata(sd); 344 struct mt9t031 *mt9t031 = to_mt9t031(client); 345 346 mf->width = mt9t031->rect.width / mt9t031->xskip; 347 mf->height = mt9t031->rect.height / mt9t031->yskip; 348 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10; 349 mf->colorspace = V4L2_COLORSPACE_SRGB; 350 mf->field = V4L2_FIELD_NONE; 351 352 return 0; 353} 354 355static int mt9t031_s_fmt(struct v4l2_subdev *sd, 356 struct v4l2_mbus_framefmt *mf) 357{ 358 struct i2c_client *client = v4l2_get_subdevdata(sd); 359 struct mt9t031 *mt9t031 = to_mt9t031(client); 360 u16 xskip, yskip; 361 struct v4l2_rect rect = mt9t031->rect; 362 363 /* 364 * try_fmt has put width and height within limits. 365 * S_FMT: use binning and skipping for scaling 366 */ 367 xskip = mt9t031_skip(&rect.width, mf->width, MT9T031_MAX_WIDTH); 368 yskip = mt9t031_skip(&rect.height, mf->height, MT9T031_MAX_HEIGHT); 369 370 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10; 371 mf->colorspace = V4L2_COLORSPACE_SRGB; 372 373 /* mt9t031_set_params() doesn't change width and height */ 374 return mt9t031_set_params(client, &rect, xskip, yskip); 375} 376 377/* 378 * If a user window larger than sensor window is requested, we'll increase the 379 * sensor window. 380 */ 381static int mt9t031_try_fmt(struct v4l2_subdev *sd, 382 struct v4l2_mbus_framefmt *mf) 383{ 384 v4l_bound_align_image( 385 &mf->width, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH, 1, 386 &mf->height, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT, 1, 0); 387 388 mf->code = V4L2_MBUS_FMT_SBGGR10_1X10; 389 mf->colorspace = V4L2_COLORSPACE_SRGB; 390 391 return 0; 392} 393 394static int mt9t031_g_chip_ident(struct v4l2_subdev *sd, 395 struct v4l2_dbg_chip_ident *id) 396{ 397 struct i2c_client *client = v4l2_get_subdevdata(sd); 398 struct mt9t031 *mt9t031 = to_mt9t031(client); 399 400 if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR) 401 return -EINVAL; 402 403 if (id->match.addr != client->addr) 404 return -ENODEV; 405 406 id->ident = mt9t031->model; 407 id->revision = 0; 408 409 return 0; 410} 411 412#ifdef CONFIG_VIDEO_ADV_DEBUG 413static int mt9t031_g_register(struct v4l2_subdev *sd, 414 struct v4l2_dbg_register *reg) 415{ 416 struct i2c_client *client = v4l2_get_subdevdata(sd); 417 418 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) 419 return -EINVAL; 420 421 if (reg->match.addr != client->addr) 422 return -ENODEV; 423 424 reg->val = reg_read(client, reg->reg); 425 426 if (reg->val > 0xffff) 427 return -EIO; 428 429 return 0; 430} 431 432static int mt9t031_s_register(struct v4l2_subdev *sd, 433 struct v4l2_dbg_register *reg) 434{ 435 struct i2c_client *client = v4l2_get_subdevdata(sd); 436 437 if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) 438 return -EINVAL; 439 440 if (reg->match.addr != client->addr) 441 return -ENODEV; 442 443 if (reg_write(client, reg->reg, reg->val) < 0) 444 return -EIO; 445 446 return 0; 447} 448#endif 449 450static int mt9t031_g_volatile_ctrl(struct v4l2_ctrl *ctrl) 451{ 452 struct mt9t031 *mt9t031 = container_of(ctrl->handler, 453 struct mt9t031, hdl); 454 const u32 shutter_max = MT9T031_MAX_HEIGHT + MT9T031_VERTICAL_BLANK; 455 s32 min, max; 456 457 switch (ctrl->id) { 458 case V4L2_CID_EXPOSURE_AUTO: 459 min = mt9t031->exposure->minimum; 460 max = mt9t031->exposure->maximum; 461 mt9t031->exposure->val = 462 (shutter_max / 2 + (mt9t031->total_h - 1) * (max - min)) 463 / shutter_max + min; 464 break; 465 } 466 return 0; 467} 468 469static int mt9t031_s_ctrl(struct v4l2_ctrl *ctrl) 470{ 471 struct mt9t031 *mt9t031 = container_of(ctrl->handler, 472 struct mt9t031, hdl); 473 struct v4l2_subdev *sd = &mt9t031->subdev; 474 struct i2c_client *client = v4l2_get_subdevdata(sd); 475 struct v4l2_ctrl *exp = mt9t031->exposure; 476 int data; 477 478 switch (ctrl->id) { 479 case V4L2_CID_VFLIP: 480 if (ctrl->val) 481 data = reg_set(client, MT9T031_READ_MODE_2, 0x8000); 482 else 483 data = reg_clear(client, MT9T031_READ_MODE_2, 0x8000); 484 if (data < 0) 485 return -EIO; 486 return 0; 487 case V4L2_CID_HFLIP: 488 if (ctrl->val) 489 data = reg_set(client, MT9T031_READ_MODE_2, 0x4000); 490 else 491 data = reg_clear(client, MT9T031_READ_MODE_2, 0x4000); 492 if (data < 0) 493 return -EIO; 494 return 0; 495 case V4L2_CID_GAIN: 496 /* See Datasheet Table 7, Gain settings. */ 497 if (ctrl->val <= ctrl->default_value) { 498 /* Pack it into 0..1 step 0.125, register values 0..8 */ 499 unsigned long range = ctrl->default_value - ctrl->minimum; 500 data = ((ctrl->val - ctrl->minimum) * 8 + range / 2) / range; 501 502 dev_dbg(&client->dev, "Setting gain %d\n", data); 503 data = reg_write(client, MT9T031_GLOBAL_GAIN, data); 504 if (data < 0) 505 return -EIO; 506 } else { 507 /* Pack it into 1.125..128 variable step, register values 9..0x7860 */ 508 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */ 509 unsigned long range = ctrl->maximum - ctrl->default_value - 1; 510 /* calculated gain: map 65..127 to 9..1024 step 0.125 */ 511 unsigned long gain = ((ctrl->val - ctrl->default_value - 1) * 512 1015 + range / 2) / range + 9; 513 514 if (gain <= 32) /* calculated gain 9..32 -> 9..32 */ 515 data = gain; 516 else if (gain <= 64) /* calculated gain 33..64 -> 0x51..0x60 */ 517 data = ((gain - 32) * 16 + 16) / 32 + 80; 518 else 519 /* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */ 520 data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60; 521 522 dev_dbg(&client->dev, "Set gain from 0x%x to 0x%x\n", 523 reg_read(client, MT9T031_GLOBAL_GAIN), data); 524 data = reg_write(client, MT9T031_GLOBAL_GAIN, data); 525 if (data < 0) 526 return -EIO; 527 } 528 return 0; 529 530 case V4L2_CID_EXPOSURE_AUTO: 531 if (ctrl->val == V4L2_EXPOSURE_MANUAL) { 532 unsigned int range = exp->maximum - exp->minimum; 533 unsigned int shutter = ((exp->val - exp->minimum) * 1048 + 534 range / 2) / range + 1; 535 u32 old; 536 537 get_shutter(client, &old); 538 dev_dbg(&client->dev, "Set shutter from %u to %u\n", 539 old, shutter); 540 if (set_shutter(client, shutter) < 0) 541 return -EIO; 542 } else { 543 const u16 vblank = MT9T031_VERTICAL_BLANK; 544 mt9t031->total_h = mt9t031->rect.height + 545 mt9t031->y_skip_top + vblank; 546 547 if (set_shutter(client, mt9t031->total_h) < 0) 548 return -EIO; 549 } 550 return 0; 551 default: 552 return -EINVAL; 553 } 554 return 0; 555} 556 557/* 558 * Power Management: 559 * This function does nothing for now but must be present for pm to work 560 */ 561static int mt9t031_runtime_suspend(struct device *dev) 562{ 563 return 0; 564} 565 566/* 567 * Power Management: 568 * COLUMN_ADDRESS_MODE and ROW_ADDRESS_MODE are not rewritten if unchanged 569 * they are however changed at reset if the platform hook is present 570 * thus we rewrite them with the values stored by the driver 571 */ 572static int mt9t031_runtime_resume(struct device *dev) 573{ 574 struct video_device *vdev = to_video_device(dev); 575 struct v4l2_subdev *sd = soc_camera_vdev_to_subdev(vdev); 576 struct i2c_client *client = v4l2_get_subdevdata(sd); 577 struct mt9t031 *mt9t031 = to_mt9t031(client); 578 579 int ret; 580 u16 xbin, ybin; 581 582 xbin = min(mt9t031->xskip, (u16)3); 583 ybin = min(mt9t031->yskip, (u16)3); 584 585 ret = reg_write(client, MT9T031_COLUMN_ADDRESS_MODE, 586 ((xbin - 1) << 4) | (mt9t031->xskip - 1)); 587 if (ret < 0) 588 return ret; 589 590 ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE, 591 ((ybin - 1) << 4) | (mt9t031->yskip - 1)); 592 if (ret < 0) 593 return ret; 594 595 return 0; 596} 597 598static struct dev_pm_ops mt9t031_dev_pm_ops = { 599 .runtime_suspend = mt9t031_runtime_suspend, 600 .runtime_resume = mt9t031_runtime_resume, 601}; 602 603static struct device_type mt9t031_dev_type = { 604 .name = "MT9T031", 605 .pm = &mt9t031_dev_pm_ops, 606}; 607 608static int mt9t031_s_power(struct v4l2_subdev *sd, int on) 609{ 610 struct i2c_client *client = v4l2_get_subdevdata(sd); 611 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client); 612 struct video_device *vdev = soc_camera_i2c_to_vdev(client); 613 int ret; 614 615 if (on) { 616 ret = soc_camera_power_on(&client->dev, ssdd); 617 if (ret < 0) 618 return ret; 619 vdev->dev.type = &mt9t031_dev_type; 620 } else { 621 vdev->dev.type = NULL; 622 soc_camera_power_off(&client->dev, ssdd); 623 } 624 625 return 0; 626} 627 628/* 629 * Interface active, can use i2c. If it fails, it can indeed mean, that 630 * this wasn't our capture interface, so, we wait for the right one 631 */ 632static int mt9t031_video_probe(struct i2c_client *client) 633{ 634 struct mt9t031 *mt9t031 = to_mt9t031(client); 635 s32 data; 636 int ret; 637 638 ret = mt9t031_s_power(&mt9t031->subdev, 1); 639 if (ret < 0) 640 return ret; 641 642 ret = mt9t031_idle(client); 643 if (ret < 0) { 644 dev_err(&client->dev, "Failed to initialise the camera\n"); 645 goto done; 646 } 647 648 /* Read out the chip version register */ 649 data = reg_read(client, MT9T031_CHIP_VERSION); 650 651 switch (data) { 652 case 0x1621: 653 mt9t031->model = V4L2_IDENT_MT9T031; 654 break; 655 default: 656 dev_err(&client->dev, 657 "No MT9T031 chip detected, register read %x\n", data); 658 ret = -ENODEV; 659 goto done; 660 } 661 662 dev_info(&client->dev, "Detected a MT9T031 chip ID %x\n", data); 663 664 ret = v4l2_ctrl_handler_setup(&mt9t031->hdl); 665 666done: 667 mt9t031_s_power(&mt9t031->subdev, 0); 668 669 return ret; 670} 671 672static int mt9t031_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines) 673{ 674 struct i2c_client *client = v4l2_get_subdevdata(sd); 675 struct mt9t031 *mt9t031 = to_mt9t031(client); 676 677 *lines = mt9t031->y_skip_top; 678 679 return 0; 680} 681 682static const struct v4l2_ctrl_ops mt9t031_ctrl_ops = { 683 .g_volatile_ctrl = mt9t031_g_volatile_ctrl, 684 .s_ctrl = mt9t031_s_ctrl, 685}; 686 687static struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = { 688 .g_chip_ident = mt9t031_g_chip_ident, 689 .s_power = mt9t031_s_power, 690#ifdef CONFIG_VIDEO_ADV_DEBUG 691 .g_register = mt9t031_g_register, 692 .s_register = mt9t031_s_register, 693#endif 694}; 695 696static int mt9t031_enum_fmt(struct v4l2_subdev *sd, unsigned int index, 697 enum v4l2_mbus_pixelcode *code) 698{ 699 if (index) 700 return -EINVAL; 701 702 *code = V4L2_MBUS_FMT_SBGGR10_1X10; 703 return 0; 704} 705 706static int mt9t031_g_mbus_config(struct v4l2_subdev *sd, 707 struct v4l2_mbus_config *cfg) 708{ 709 struct i2c_client *client = v4l2_get_subdevdata(sd); 710 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client); 711 712 cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_PCLK_SAMPLE_RISING | 713 V4L2_MBUS_PCLK_SAMPLE_FALLING | V4L2_MBUS_HSYNC_ACTIVE_HIGH | 714 V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_HIGH; 715 cfg->type = V4L2_MBUS_PARALLEL; 716 cfg->flags = soc_camera_apply_board_flags(ssdd, cfg); 717 718 return 0; 719} 720 721static int mt9t031_s_mbus_config(struct v4l2_subdev *sd, 722 const struct v4l2_mbus_config *cfg) 723{ 724 struct i2c_client *client = v4l2_get_subdevdata(sd); 725 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client); 726 727 if (soc_camera_apply_board_flags(ssdd, cfg) & 728 V4L2_MBUS_PCLK_SAMPLE_FALLING) 729 return reg_clear(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000); 730 else 731 return reg_set(client, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000); 732} 733 734static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = { 735 .s_stream = mt9t031_s_stream, 736 .s_mbus_fmt = mt9t031_s_fmt, 737 .g_mbus_fmt = mt9t031_g_fmt, 738 .try_mbus_fmt = mt9t031_try_fmt, 739 .s_crop = mt9t031_s_crop, 740 .g_crop = mt9t031_g_crop, 741 .cropcap = mt9t031_cropcap, 742 .enum_mbus_fmt = mt9t031_enum_fmt, 743 .g_mbus_config = mt9t031_g_mbus_config, 744 .s_mbus_config = mt9t031_s_mbus_config, 745}; 746 747static struct v4l2_subdev_sensor_ops mt9t031_subdev_sensor_ops = { 748 .g_skip_top_lines = mt9t031_g_skip_top_lines, 749}; 750 751static struct v4l2_subdev_ops mt9t031_subdev_ops = { 752 .core = &mt9t031_subdev_core_ops, 753 .video = &mt9t031_subdev_video_ops, 754 .sensor = &mt9t031_subdev_sensor_ops, 755}; 756 757static int mt9t031_probe(struct i2c_client *client, 758 const struct i2c_device_id *did) 759{ 760 struct mt9t031 *mt9t031; 761 struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client); 762 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); 763 int ret; 764 765 if (!ssdd) { 766 dev_err(&client->dev, "MT9T031 driver needs platform data\n"); 767 return -EINVAL; 768 } 769 770 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) { 771 dev_warn(&adapter->dev, 772 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); 773 return -EIO; 774 } 775 776 mt9t031 = devm_kzalloc(&client->dev, sizeof(struct mt9t031), GFP_KERNEL); 777 if (!mt9t031) 778 return -ENOMEM; 779 780 v4l2_i2c_subdev_init(&mt9t031->subdev, client, &mt9t031_subdev_ops); 781 v4l2_ctrl_handler_init(&mt9t031->hdl, 5); 782 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops, 783 V4L2_CID_VFLIP, 0, 1, 1, 0); 784 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops, 785 V4L2_CID_HFLIP, 0, 1, 1, 0); 786 v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops, 787 V4L2_CID_GAIN, 0, 127, 1, 64); 788 789 /* 790 * Simulated autoexposure. If enabled, we calculate shutter width 791 * ourselves in the driver based on vertical blanking and frame width 792 */ 793 mt9t031->autoexposure = v4l2_ctrl_new_std_menu(&mt9t031->hdl, 794 &mt9t031_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0, 795 V4L2_EXPOSURE_AUTO); 796 mt9t031->exposure = v4l2_ctrl_new_std(&mt9t031->hdl, &mt9t031_ctrl_ops, 797 V4L2_CID_EXPOSURE, 1, 255, 1, 255); 798 799 mt9t031->subdev.ctrl_handler = &mt9t031->hdl; 800 if (mt9t031->hdl.error) 801 return mt9t031->hdl.error; 802 803 v4l2_ctrl_auto_cluster(2, &mt9t031->autoexposure, 804 V4L2_EXPOSURE_MANUAL, true); 805 806 mt9t031->y_skip_top = 0; 807 mt9t031->rect.left = MT9T031_COLUMN_SKIP; 808 mt9t031->rect.top = MT9T031_ROW_SKIP; 809 mt9t031->rect.width = MT9T031_MAX_WIDTH; 810 mt9t031->rect.height = MT9T031_MAX_HEIGHT; 811 812 mt9t031->xskip = 1; 813 mt9t031->yskip = 1; 814 815 ret = mt9t031_video_probe(client); 816 if (ret) 817 v4l2_ctrl_handler_free(&mt9t031->hdl); 818 819 return ret; 820} 821 822static int mt9t031_remove(struct i2c_client *client) 823{ 824 struct mt9t031 *mt9t031 = to_mt9t031(client); 825 826 v4l2_device_unregister_subdev(&mt9t031->subdev); 827 v4l2_ctrl_handler_free(&mt9t031->hdl); 828 829 return 0; 830} 831 832static const struct i2c_device_id mt9t031_id[] = { 833 { "mt9t031", 0 }, 834 { } 835}; 836MODULE_DEVICE_TABLE(i2c, mt9t031_id); 837 838static struct i2c_driver mt9t031_i2c_driver = { 839 .driver = { 840 .name = "mt9t031", 841 }, 842 .probe = mt9t031_probe, 843 .remove = mt9t031_remove, 844 .id_table = mt9t031_id, 845}; 846 847module_i2c_driver(mt9t031_i2c_driver); 848 849MODULE_DESCRIPTION("Micron MT9T031 Camera driver"); 850MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>"); 851MODULE_LICENSE("GPL v2"); 852