1/* 2 * Driver for MT9M032 CMOS Image Sensor from Micron 3 * 4 * Copyright (C) 2010-2011 Lund Engineering 5 * Contact: Gil Lund <gwlund@lundeng.com> 6 * Author: Martin Hostettler <martin@neutronstar.dyndns.org> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * version 2 as published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 20 * 02110-1301 USA 21 */ 22 23#include <linux/delay.h> 24#include <linux/i2c.h> 25#include <linux/init.h> 26#include <linux/kernel.h> 27#include <linux/math64.h> 28#include <linux/module.h> 29#include <linux/mutex.h> 30#include <linux/slab.h> 31#include <linux/v4l2-mediabus.h> 32 33#include <media/media-entity.h> 34#include <media/mt9m032.h> 35#include <media/v4l2-ctrls.h> 36#include <media/v4l2-device.h> 37#include <media/v4l2-subdev.h> 38 39#include "aptina-pll.h" 40 41/* 42 * width and height include active boundary and black parts 43 * 44 * column 0- 15 active boundary 45 * column 16-1455 image 46 * column 1456-1471 active boundary 47 * column 1472-1599 black 48 * 49 * row 0- 51 black 50 * row 53- 59 active boundary 51 * row 60-1139 image 52 * row 1140-1147 active boundary 53 * row 1148-1151 black 54 */ 55 56#define MT9M032_PIXEL_ARRAY_WIDTH 1600 57#define MT9M032_PIXEL_ARRAY_HEIGHT 1152 58 59#define MT9M032_CHIP_VERSION 0x00 60#define MT9M032_CHIP_VERSION_VALUE 0x1402 61#define MT9M032_ROW_START 0x01 62#define MT9M032_ROW_START_MIN 0 63#define MT9M032_ROW_START_MAX 1152 64#define MT9M032_ROW_START_DEF 60 65#define MT9M032_COLUMN_START 0x02 66#define MT9M032_COLUMN_START_MIN 0 67#define MT9M032_COLUMN_START_MAX 1600 68#define MT9M032_COLUMN_START_DEF 16 69#define MT9M032_ROW_SIZE 0x03 70#define MT9M032_ROW_SIZE_MIN 32 71#define MT9M032_ROW_SIZE_MAX 1152 72#define MT9M032_ROW_SIZE_DEF 1080 73#define MT9M032_COLUMN_SIZE 0x04 74#define MT9M032_COLUMN_SIZE_MIN 32 75#define MT9M032_COLUMN_SIZE_MAX 1600 76#define MT9M032_COLUMN_SIZE_DEF 1440 77#define MT9M032_HBLANK 0x05 78#define MT9M032_VBLANK 0x06 79#define MT9M032_VBLANK_MAX 0x7ff 80#define MT9M032_SHUTTER_WIDTH_HIGH 0x08 81#define MT9M032_SHUTTER_WIDTH_LOW 0x09 82#define MT9M032_SHUTTER_WIDTH_MIN 1 83#define MT9M032_SHUTTER_WIDTH_MAX 1048575 84#define MT9M032_SHUTTER_WIDTH_DEF 1943 85#define MT9M032_PIX_CLK_CTRL 0x0a 86#define MT9M032_PIX_CLK_CTRL_INV_PIXCLK 0x8000 87#define MT9M032_RESTART 0x0b 88#define MT9M032_RESET 0x0d 89#define MT9M032_PLL_CONFIG1 0x11 90#define MT9M032_PLL_CONFIG1_PREDIV_MASK 0x3f 91#define MT9M032_PLL_CONFIG1_MUL_SHIFT 8 92#define MT9M032_READ_MODE1 0x1e 93#define MT9M032_READ_MODE1_OUTPUT_BAD_FRAMES (1 << 13) 94#define MT9M032_READ_MODE1_MAINTAIN_FRAME_RATE (1 << 12) 95#define MT9M032_READ_MODE1_XOR_LINE_VALID (1 << 11) 96#define MT9M032_READ_MODE1_CONT_LINE_VALID (1 << 10) 97#define MT9M032_READ_MODE1_INVERT_TRIGGER (1 << 9) 98#define MT9M032_READ_MODE1_SNAPSHOT (1 << 8) 99#define MT9M032_READ_MODE1_GLOBAL_RESET (1 << 7) 100#define MT9M032_READ_MODE1_BULB_EXPOSURE (1 << 6) 101#define MT9M032_READ_MODE1_INVERT_STROBE (1 << 5) 102#define MT9M032_READ_MODE1_STROBE_ENABLE (1 << 4) 103#define MT9M032_READ_MODE1_STROBE_START_TRIG1 (0 << 2) 104#define MT9M032_READ_MODE1_STROBE_START_EXP (1 << 2) 105#define MT9M032_READ_MODE1_STROBE_START_SHUTTER (2 << 2) 106#define MT9M032_READ_MODE1_STROBE_START_TRIG2 (3 << 2) 107#define MT9M032_READ_MODE1_STROBE_END_TRIG1 (0 << 0) 108#define MT9M032_READ_MODE1_STROBE_END_EXP (1 << 0) 109#define MT9M032_READ_MODE1_STROBE_END_SHUTTER (2 << 0) 110#define MT9M032_READ_MODE1_STROBE_END_TRIG2 (3 << 0) 111#define MT9M032_READ_MODE2 0x20 112#define MT9M032_READ_MODE2_VFLIP_SHIFT 15 113#define MT9M032_READ_MODE2_HFLIP_SHIFT 14 114#define MT9M032_READ_MODE2_ROW_BLC 0x40 115#define MT9M032_GAIN_GREEN1 0x2b 116#define MT9M032_GAIN_BLUE 0x2c 117#define MT9M032_GAIN_RED 0x2d 118#define MT9M032_GAIN_GREEN2 0x2e 119 120/* write only */ 121#define MT9M032_GAIN_ALL 0x35 122#define MT9M032_GAIN_DIGITAL_MASK 0x7f 123#define MT9M032_GAIN_DIGITAL_SHIFT 8 124#define MT9M032_GAIN_AMUL_SHIFT 6 125#define MT9M032_GAIN_ANALOG_MASK 0x3f 126#define MT9M032_FORMATTER1 0x9e 127#define MT9M032_FORMATTER1_PLL_P1_6 (1 << 8) 128#define MT9M032_FORMATTER1_PARALLEL (1 << 12) 129#define MT9M032_FORMATTER2 0x9f 130#define MT9M032_FORMATTER2_DOUT_EN 0x1000 131#define MT9M032_FORMATTER2_PIXCLK_EN 0x2000 132 133/* 134 * The available MT9M032 datasheet is missing documentation for register 0x10 135 * MT9P031 seems to be close enough, so use constants from that datasheet for 136 * now. 137 * But keep the name MT9P031 to remind us, that this isn't really confirmed 138 * for this sensor. 139 */ 140#define MT9P031_PLL_CONTROL 0x10 141#define MT9P031_PLL_CONTROL_PWROFF 0x0050 142#define MT9P031_PLL_CONTROL_PWRON 0x0051 143#define MT9P031_PLL_CONTROL_USEPLL 0x0052 144 145struct mt9m032 { 146 struct v4l2_subdev subdev; 147 struct media_pad pad; 148 struct mt9m032_platform_data *pdata; 149 150 unsigned int pix_clock; 151 152 struct v4l2_ctrl_handler ctrls; 153 struct { 154 struct v4l2_ctrl *hflip; 155 struct v4l2_ctrl *vflip; 156 }; 157 158 struct mutex lock; /* Protects streaming, format, interval and crop */ 159 160 bool streaming; 161 162 struct v4l2_mbus_framefmt format; 163 struct v4l2_rect crop; 164 struct v4l2_fract frame_interval; 165}; 166 167#define to_mt9m032(sd) container_of(sd, struct mt9m032, subdev) 168#define to_dev(sensor) \ 169 (&((struct i2c_client *)v4l2_get_subdevdata(&(sensor)->subdev))->dev) 170 171static int mt9m032_read(struct i2c_client *client, u8 reg) 172{ 173 return i2c_smbus_read_word_swapped(client, reg); 174} 175 176static int mt9m032_write(struct i2c_client *client, u8 reg, const u16 data) 177{ 178 return i2c_smbus_write_word_swapped(client, reg, data); 179} 180 181static u32 mt9m032_row_time(struct mt9m032 *sensor, unsigned int width) 182{ 183 unsigned int effective_width; 184 u32 ns; 185 186 effective_width = width + 716; /* empirical value */ 187 ns = div_u64(1000000000ULL * effective_width, sensor->pix_clock); 188 dev_dbg(to_dev(sensor), "MT9M032 line time: %u ns\n", ns); 189 return ns; 190} 191 192static int mt9m032_update_timing(struct mt9m032 *sensor, 193 struct v4l2_fract *interval) 194{ 195 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev); 196 struct v4l2_rect *crop = &sensor->crop; 197 unsigned int min_vblank; 198 unsigned int vblank; 199 u32 row_time; 200 201 if (!interval) 202 interval = &sensor->frame_interval; 203 204 row_time = mt9m032_row_time(sensor, crop->width); 205 206 vblank = div_u64(1000000000ULL * interval->numerator, 207 (u64)row_time * interval->denominator) 208 - crop->height; 209 210 if (vblank > MT9M032_VBLANK_MAX) { 211 /* hardware limits to 11 bit values */ 212 interval->denominator = 1000; 213 interval->numerator = 214 div_u64((crop->height + MT9M032_VBLANK_MAX) * 215 (u64)row_time * interval->denominator, 216 1000000000ULL); 217 vblank = div_u64(1000000000ULL * interval->numerator, 218 (u64)row_time * interval->denominator) 219 - crop->height; 220 } 221 /* enforce minimal 1.6ms blanking time. */ 222 min_vblank = 1600000 / row_time; 223 vblank = clamp_t(unsigned int, vblank, min_vblank, MT9M032_VBLANK_MAX); 224 225 return mt9m032_write(client, MT9M032_VBLANK, vblank); 226} 227 228static int mt9m032_update_geom_timing(struct mt9m032 *sensor) 229{ 230 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev); 231 int ret; 232 233 ret = mt9m032_write(client, MT9M032_COLUMN_SIZE, 234 sensor->crop.width - 1); 235 if (!ret) 236 ret = mt9m032_write(client, MT9M032_ROW_SIZE, 237 sensor->crop.height - 1); 238 if (!ret) 239 ret = mt9m032_write(client, MT9M032_COLUMN_START, 240 sensor->crop.left); 241 if (!ret) 242 ret = mt9m032_write(client, MT9M032_ROW_START, 243 sensor->crop.top); 244 if (!ret) 245 ret = mt9m032_update_timing(sensor, NULL); 246 return ret; 247} 248 249static int update_formatter2(struct mt9m032 *sensor, bool streaming) 250{ 251 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev); 252 u16 reg_val = MT9M032_FORMATTER2_DOUT_EN 253 | 0x0070; /* parts reserved! */ 254 /* possibly for changing to 14-bit mode */ 255 256 if (streaming) 257 reg_val |= MT9M032_FORMATTER2_PIXCLK_EN; /* pixclock enable */ 258 259 return mt9m032_write(client, MT9M032_FORMATTER2, reg_val); 260} 261 262static int mt9m032_setup_pll(struct mt9m032 *sensor) 263{ 264 static const struct aptina_pll_limits limits = { 265 .ext_clock_min = 8000000, 266 .ext_clock_max = 16500000, 267 .int_clock_min = 2000000, 268 .int_clock_max = 24000000, 269 .out_clock_min = 322000000, 270 .out_clock_max = 693000000, 271 .pix_clock_max = 99000000, 272 .n_min = 1, 273 .n_max = 64, 274 .m_min = 16, 275 .m_max = 255, 276 .p1_min = 6, 277 .p1_max = 7, 278 }; 279 280 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev); 281 struct mt9m032_platform_data *pdata = sensor->pdata; 282 struct aptina_pll pll; 283 u16 reg_val; 284 int ret; 285 286 pll.ext_clock = pdata->ext_clock; 287 pll.pix_clock = pdata->pix_clock; 288 289 ret = aptina_pll_calculate(&client->dev, &limits, &pll); 290 if (ret < 0) 291 return ret; 292 293 sensor->pix_clock = pdata->pix_clock; 294 295 ret = mt9m032_write(client, MT9M032_PLL_CONFIG1, 296 (pll.m << MT9M032_PLL_CONFIG1_MUL_SHIFT) | 297 ((pll.n - 1) & MT9M032_PLL_CONFIG1_PREDIV_MASK)); 298 if (!ret) 299 ret = mt9m032_write(client, MT9P031_PLL_CONTROL, 300 MT9P031_PLL_CONTROL_PWRON | 301 MT9P031_PLL_CONTROL_USEPLL); 302 if (!ret) /* more reserved, Continuous, Master Mode */ 303 ret = mt9m032_write(client, MT9M032_READ_MODE1, 0x8000 | 304 MT9M032_READ_MODE1_STROBE_START_EXP | 305 MT9M032_READ_MODE1_STROBE_END_SHUTTER); 306 if (!ret) { 307 reg_val = (pll.p1 == 6 ? MT9M032_FORMATTER1_PLL_P1_6 : 0) 308 | MT9M032_FORMATTER1_PARALLEL | 0x001e; /* 14-bit */ 309 ret = mt9m032_write(client, MT9M032_FORMATTER1, reg_val); 310 } 311 312 return ret; 313} 314 315/* ----------------------------------------------------------------------------- 316 * Subdev pad operations 317 */ 318 319static int mt9m032_enum_mbus_code(struct v4l2_subdev *subdev, 320 struct v4l2_subdev_fh *fh, 321 struct v4l2_subdev_mbus_code_enum *code) 322{ 323 if (code->index != 0) 324 return -EINVAL; 325 326 code->code = V4L2_MBUS_FMT_Y8_1X8; 327 return 0; 328} 329 330static int mt9m032_enum_frame_size(struct v4l2_subdev *subdev, 331 struct v4l2_subdev_fh *fh, 332 struct v4l2_subdev_frame_size_enum *fse) 333{ 334 if (fse->index != 0 || fse->code != V4L2_MBUS_FMT_Y8_1X8) 335 return -EINVAL; 336 337 fse->min_width = MT9M032_COLUMN_SIZE_DEF; 338 fse->max_width = MT9M032_COLUMN_SIZE_DEF; 339 fse->min_height = MT9M032_ROW_SIZE_DEF; 340 fse->max_height = MT9M032_ROW_SIZE_DEF; 341 342 return 0; 343} 344 345/** 346 * __mt9m032_get_pad_crop() - get crop rect 347 * @sensor: pointer to the sensor struct 348 * @fh: file handle for getting the try crop rect from 349 * @which: select try or active crop rect 350 * 351 * Returns a pointer the current active or fh relative try crop rect 352 */ 353static struct v4l2_rect * 354__mt9m032_get_pad_crop(struct mt9m032 *sensor, struct v4l2_subdev_fh *fh, 355 enum v4l2_subdev_format_whence which) 356{ 357 switch (which) { 358 case V4L2_SUBDEV_FORMAT_TRY: 359 return v4l2_subdev_get_try_crop(fh, 0); 360 case V4L2_SUBDEV_FORMAT_ACTIVE: 361 return &sensor->crop; 362 default: 363 return NULL; 364 } 365} 366 367/** 368 * __mt9m032_get_pad_format() - get format 369 * @sensor: pointer to the sensor struct 370 * @fh: file handle for getting the try format from 371 * @which: select try or active format 372 * 373 * Returns a pointer the current active or fh relative try format 374 */ 375static struct v4l2_mbus_framefmt * 376__mt9m032_get_pad_format(struct mt9m032 *sensor, struct v4l2_subdev_fh *fh, 377 enum v4l2_subdev_format_whence which) 378{ 379 switch (which) { 380 case V4L2_SUBDEV_FORMAT_TRY: 381 return v4l2_subdev_get_try_format(fh, 0); 382 case V4L2_SUBDEV_FORMAT_ACTIVE: 383 return &sensor->format; 384 default: 385 return NULL; 386 } 387} 388 389static int mt9m032_get_pad_format(struct v4l2_subdev *subdev, 390 struct v4l2_subdev_fh *fh, 391 struct v4l2_subdev_format *fmt) 392{ 393 struct mt9m032 *sensor = to_mt9m032(subdev); 394 395 mutex_lock(&sensor->lock); 396 fmt->format = *__mt9m032_get_pad_format(sensor, fh, fmt->which); 397 mutex_unlock(&sensor->lock); 398 399 return 0; 400} 401 402static int mt9m032_set_pad_format(struct v4l2_subdev *subdev, 403 struct v4l2_subdev_fh *fh, 404 struct v4l2_subdev_format *fmt) 405{ 406 struct mt9m032 *sensor = to_mt9m032(subdev); 407 int ret; 408 409 mutex_lock(&sensor->lock); 410 411 if (sensor->streaming && fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) { 412 ret = -EBUSY; 413 goto done; 414 } 415 416 /* Scaling is not supported, the format is thus fixed. */ 417 fmt->format = *__mt9m032_get_pad_format(sensor, fh, fmt->which); 418 ret = 0; 419 420done: 421 mutex_unlock(&sensor->lock); 422 return ret; 423} 424 425static int mt9m032_get_pad_crop(struct v4l2_subdev *subdev, 426 struct v4l2_subdev_fh *fh, 427 struct v4l2_subdev_crop *crop) 428{ 429 struct mt9m032 *sensor = to_mt9m032(subdev); 430 431 mutex_lock(&sensor->lock); 432 crop->rect = *__mt9m032_get_pad_crop(sensor, fh, crop->which); 433 mutex_unlock(&sensor->lock); 434 435 return 0; 436} 437 438static int mt9m032_set_pad_crop(struct v4l2_subdev *subdev, 439 struct v4l2_subdev_fh *fh, 440 struct v4l2_subdev_crop *crop) 441{ 442 struct mt9m032 *sensor = to_mt9m032(subdev); 443 struct v4l2_mbus_framefmt *format; 444 struct v4l2_rect *__crop; 445 struct v4l2_rect rect; 446 int ret = 0; 447 448 mutex_lock(&sensor->lock); 449 450 if (sensor->streaming && crop->which == V4L2_SUBDEV_FORMAT_ACTIVE) { 451 ret = -EBUSY; 452 goto done; 453 } 454 455 /* Clamp the crop rectangle boundaries and align them to a multiple of 2 456 * pixels to ensure a GRBG Bayer pattern. 457 */ 458 rect.left = clamp(ALIGN(crop->rect.left, 2), MT9M032_COLUMN_START_MIN, 459 MT9M032_COLUMN_START_MAX); 460 rect.top = clamp(ALIGN(crop->rect.top, 2), MT9M032_ROW_START_MIN, 461 MT9M032_ROW_START_MAX); 462 rect.width = clamp_t(unsigned int, ALIGN(crop->rect.width, 2), 463 MT9M032_COLUMN_SIZE_MIN, MT9M032_COLUMN_SIZE_MAX); 464 rect.height = clamp_t(unsigned int, ALIGN(crop->rect.height, 2), 465 MT9M032_ROW_SIZE_MIN, MT9M032_ROW_SIZE_MAX); 466 467 rect.width = min_t(unsigned int, rect.width, 468 MT9M032_PIXEL_ARRAY_WIDTH - rect.left); 469 rect.height = min_t(unsigned int, rect.height, 470 MT9M032_PIXEL_ARRAY_HEIGHT - rect.top); 471 472 __crop = __mt9m032_get_pad_crop(sensor, fh, crop->which); 473 474 if (rect.width != __crop->width || rect.height != __crop->height) { 475 /* Reset the output image size if the crop rectangle size has 476 * been modified. 477 */ 478 format = __mt9m032_get_pad_format(sensor, fh, crop->which); 479 format->width = rect.width; 480 format->height = rect.height; 481 } 482 483 *__crop = rect; 484 crop->rect = rect; 485 486 if (crop->which == V4L2_SUBDEV_FORMAT_ACTIVE) 487 ret = mt9m032_update_geom_timing(sensor); 488 489done: 490 mutex_unlock(&sensor->lock); 491 return ret; 492} 493 494static int mt9m032_get_frame_interval(struct v4l2_subdev *subdev, 495 struct v4l2_subdev_frame_interval *fi) 496{ 497 struct mt9m032 *sensor = to_mt9m032(subdev); 498 499 mutex_lock(&sensor->lock); 500 memset(fi, 0, sizeof(*fi)); 501 fi->interval = sensor->frame_interval; 502 mutex_unlock(&sensor->lock); 503 504 return 0; 505} 506 507static int mt9m032_set_frame_interval(struct v4l2_subdev *subdev, 508 struct v4l2_subdev_frame_interval *fi) 509{ 510 struct mt9m032 *sensor = to_mt9m032(subdev); 511 int ret; 512 513 mutex_lock(&sensor->lock); 514 515 if (sensor->streaming) { 516 ret = -EBUSY; 517 goto done; 518 } 519 520 /* Avoid divisions by 0. */ 521 if (fi->interval.denominator == 0) 522 fi->interval.denominator = 1; 523 524 ret = mt9m032_update_timing(sensor, &fi->interval); 525 if (!ret) 526 sensor->frame_interval = fi->interval; 527 528done: 529 mutex_unlock(&sensor->lock); 530 return ret; 531} 532 533static int mt9m032_s_stream(struct v4l2_subdev *subdev, int streaming) 534{ 535 struct mt9m032 *sensor = to_mt9m032(subdev); 536 int ret; 537 538 mutex_lock(&sensor->lock); 539 ret = update_formatter2(sensor, streaming); 540 if (!ret) 541 sensor->streaming = streaming; 542 mutex_unlock(&sensor->lock); 543 544 return ret; 545} 546 547/* ----------------------------------------------------------------------------- 548 * V4L2 subdev core operations 549 */ 550 551#ifdef CONFIG_VIDEO_ADV_DEBUG 552static int mt9m032_g_register(struct v4l2_subdev *sd, 553 struct v4l2_dbg_register *reg) 554{ 555 struct mt9m032 *sensor = to_mt9m032(sd); 556 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev); 557 int val; 558 559 if (reg->reg > 0xff) 560 return -EINVAL; 561 562 val = mt9m032_read(client, reg->reg); 563 if (val < 0) 564 return -EIO; 565 566 reg->size = 2; 567 reg->val = val; 568 569 return 0; 570} 571 572static int mt9m032_s_register(struct v4l2_subdev *sd, 573 const struct v4l2_dbg_register *reg) 574{ 575 struct mt9m032 *sensor = to_mt9m032(sd); 576 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev); 577 578 if (reg->reg > 0xff) 579 return -EINVAL; 580 581 return mt9m032_write(client, reg->reg, reg->val); 582} 583#endif 584 585/* ----------------------------------------------------------------------------- 586 * V4L2 subdev control operations 587 */ 588 589static int update_read_mode2(struct mt9m032 *sensor, bool vflip, bool hflip) 590{ 591 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev); 592 int reg_val = (vflip << MT9M032_READ_MODE2_VFLIP_SHIFT) 593 | (hflip << MT9M032_READ_MODE2_HFLIP_SHIFT) 594 | MT9M032_READ_MODE2_ROW_BLC 595 | 0x0007; 596 597 return mt9m032_write(client, MT9M032_READ_MODE2, reg_val); 598} 599 600static int mt9m032_set_gain(struct mt9m032 *sensor, s32 val) 601{ 602 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev); 603 int digital_gain_val; /* in 1/8th (0..127) */ 604 int analog_mul; /* 0 or 1 */ 605 int analog_gain_val; /* in 1/16th. (0..63) */ 606 u16 reg_val; 607 608 digital_gain_val = 51; /* from setup example */ 609 610 if (val < 63) { 611 analog_mul = 0; 612 analog_gain_val = val; 613 } else { 614 analog_mul = 1; 615 analog_gain_val = val / 2; 616 } 617 618 /* a_gain = (1 + analog_mul) + (analog_gain_val + 1) / 16 */ 619 /* overall_gain = a_gain * (1 + digital_gain_val / 8) */ 620 621 reg_val = ((digital_gain_val & MT9M032_GAIN_DIGITAL_MASK) 622 << MT9M032_GAIN_DIGITAL_SHIFT) 623 | ((analog_mul & 1) << MT9M032_GAIN_AMUL_SHIFT) 624 | (analog_gain_val & MT9M032_GAIN_ANALOG_MASK); 625 626 return mt9m032_write(client, MT9M032_GAIN_ALL, reg_val); 627} 628 629static int mt9m032_try_ctrl(struct v4l2_ctrl *ctrl) 630{ 631 if (ctrl->id == V4L2_CID_GAIN && ctrl->val >= 63) { 632 /* round because of multiplier used for values >= 63 */ 633 ctrl->val &= ~1; 634 } 635 636 return 0; 637} 638 639static int mt9m032_set_ctrl(struct v4l2_ctrl *ctrl) 640{ 641 struct mt9m032 *sensor = 642 container_of(ctrl->handler, struct mt9m032, ctrls); 643 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev); 644 int ret; 645 646 switch (ctrl->id) { 647 case V4L2_CID_GAIN: 648 return mt9m032_set_gain(sensor, ctrl->val); 649 650 case V4L2_CID_HFLIP: 651 /* case V4L2_CID_VFLIP: -- In the same cluster */ 652 return update_read_mode2(sensor, sensor->vflip->val, 653 sensor->hflip->val); 654 655 case V4L2_CID_EXPOSURE: 656 ret = mt9m032_write(client, MT9M032_SHUTTER_WIDTH_HIGH, 657 (ctrl->val >> 16) & 0xffff); 658 if (ret < 0) 659 return ret; 660 661 return mt9m032_write(client, MT9M032_SHUTTER_WIDTH_LOW, 662 ctrl->val & 0xffff); 663 } 664 665 return 0; 666} 667 668static struct v4l2_ctrl_ops mt9m032_ctrl_ops = { 669 .s_ctrl = mt9m032_set_ctrl, 670 .try_ctrl = mt9m032_try_ctrl, 671}; 672 673/* -------------------------------------------------------------------------- */ 674 675static const struct v4l2_subdev_core_ops mt9m032_core_ops = { 676#ifdef CONFIG_VIDEO_ADV_DEBUG 677 .g_register = mt9m032_g_register, 678 .s_register = mt9m032_s_register, 679#endif 680}; 681 682static const struct v4l2_subdev_video_ops mt9m032_video_ops = { 683 .s_stream = mt9m032_s_stream, 684 .g_frame_interval = mt9m032_get_frame_interval, 685 .s_frame_interval = mt9m032_set_frame_interval, 686}; 687 688static const struct v4l2_subdev_pad_ops mt9m032_pad_ops = { 689 .enum_mbus_code = mt9m032_enum_mbus_code, 690 .enum_frame_size = mt9m032_enum_frame_size, 691 .get_fmt = mt9m032_get_pad_format, 692 .set_fmt = mt9m032_set_pad_format, 693 .set_crop = mt9m032_set_pad_crop, 694 .get_crop = mt9m032_get_pad_crop, 695}; 696 697static const struct v4l2_subdev_ops mt9m032_ops = { 698 .core = &mt9m032_core_ops, 699 .video = &mt9m032_video_ops, 700 .pad = &mt9m032_pad_ops, 701}; 702 703/* ----------------------------------------------------------------------------- 704 * Driver initialization and probing 705 */ 706 707static int mt9m032_probe(struct i2c_client *client, 708 const struct i2c_device_id *devid) 709{ 710 struct mt9m032_platform_data *pdata = client->dev.platform_data; 711 struct i2c_adapter *adapter = client->adapter; 712 struct mt9m032 *sensor; 713 int chip_version; 714 int ret; 715 716 if (pdata == NULL) { 717 dev_err(&client->dev, "No platform data\n"); 718 return -EINVAL; 719 } 720 721 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) { 722 dev_warn(&client->dev, 723 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); 724 return -EIO; 725 } 726 727 if (!client->dev.platform_data) 728 return -ENODEV; 729 730 sensor = devm_kzalloc(&client->dev, sizeof(*sensor), GFP_KERNEL); 731 if (sensor == NULL) 732 return -ENOMEM; 733 734 mutex_init(&sensor->lock); 735 736 sensor->pdata = pdata; 737 738 v4l2_i2c_subdev_init(&sensor->subdev, client, &mt9m032_ops); 739 sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; 740 741 chip_version = mt9m032_read(client, MT9M032_CHIP_VERSION); 742 if (chip_version != MT9M032_CHIP_VERSION_VALUE) { 743 dev_err(&client->dev, "MT9M032 not detected, wrong version " 744 "0x%04x\n", chip_version); 745 ret = -ENODEV; 746 goto error_sensor; 747 } 748 749 dev_info(&client->dev, "MT9M032 detected at address 0x%02x\n", 750 client->addr); 751 752 sensor->frame_interval.numerator = 1; 753 sensor->frame_interval.denominator = 30; 754 755 sensor->crop.left = MT9M032_COLUMN_START_DEF; 756 sensor->crop.top = MT9M032_ROW_START_DEF; 757 sensor->crop.width = MT9M032_COLUMN_SIZE_DEF; 758 sensor->crop.height = MT9M032_ROW_SIZE_DEF; 759 760 sensor->format.width = sensor->crop.width; 761 sensor->format.height = sensor->crop.height; 762 sensor->format.code = V4L2_MBUS_FMT_Y8_1X8; 763 sensor->format.field = V4L2_FIELD_NONE; 764 sensor->format.colorspace = V4L2_COLORSPACE_SRGB; 765 766 v4l2_ctrl_handler_init(&sensor->ctrls, 5); 767 768 v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops, 769 V4L2_CID_GAIN, 0, 127, 1, 64); 770 771 sensor->hflip = v4l2_ctrl_new_std(&sensor->ctrls, 772 &mt9m032_ctrl_ops, 773 V4L2_CID_HFLIP, 0, 1, 1, 0); 774 sensor->vflip = v4l2_ctrl_new_std(&sensor->ctrls, 775 &mt9m032_ctrl_ops, 776 V4L2_CID_VFLIP, 0, 1, 1, 0); 777 778 v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops, 779 V4L2_CID_EXPOSURE, MT9M032_SHUTTER_WIDTH_MIN, 780 MT9M032_SHUTTER_WIDTH_MAX, 1, 781 MT9M032_SHUTTER_WIDTH_DEF); 782 v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops, 783 V4L2_CID_PIXEL_RATE, pdata->pix_clock, 784 pdata->pix_clock, 1, pdata->pix_clock); 785 786 if (sensor->ctrls.error) { 787 ret = sensor->ctrls.error; 788 dev_err(&client->dev, "control initialization error %d\n", ret); 789 goto error_ctrl; 790 } 791 792 v4l2_ctrl_cluster(2, &sensor->hflip); 793 794 sensor->subdev.ctrl_handler = &sensor->ctrls; 795 sensor->pad.flags = MEDIA_PAD_FL_SOURCE; 796 ret = media_entity_init(&sensor->subdev.entity, 1, &sensor->pad, 0); 797 if (ret < 0) 798 goto error_ctrl; 799 800 ret = mt9m032_write(client, MT9M032_RESET, 1); /* reset on */ 801 if (ret < 0) 802 goto error_entity; 803 ret = mt9m032_write(client, MT9M032_RESET, 0); /* reset off */ 804 if (ret < 0) 805 goto error_entity; 806 807 ret = mt9m032_setup_pll(sensor); 808 if (ret < 0) 809 goto error_entity; 810 usleep_range(10000, 11000); 811 812 ret = v4l2_ctrl_handler_setup(&sensor->ctrls); 813 if (ret < 0) 814 goto error_entity; 815 816 /* SIZE */ 817 ret = mt9m032_update_geom_timing(sensor); 818 if (ret < 0) 819 goto error_entity; 820 821 ret = mt9m032_write(client, 0x41, 0x0000); /* reserved !!! */ 822 if (ret < 0) 823 goto error_entity; 824 ret = mt9m032_write(client, 0x42, 0x0003); /* reserved !!! */ 825 if (ret < 0) 826 goto error_entity; 827 ret = mt9m032_write(client, 0x43, 0x0003); /* reserved !!! */ 828 if (ret < 0) 829 goto error_entity; 830 ret = mt9m032_write(client, 0x7f, 0x0000); /* reserved !!! */ 831 if (ret < 0) 832 goto error_entity; 833 if (sensor->pdata->invert_pixclock) { 834 ret = mt9m032_write(client, MT9M032_PIX_CLK_CTRL, 835 MT9M032_PIX_CLK_CTRL_INV_PIXCLK); 836 if (ret < 0) 837 goto error_entity; 838 } 839 840 ret = mt9m032_write(client, MT9M032_RESTART, 1); /* Restart on */ 841 if (ret < 0) 842 goto error_entity; 843 msleep(100); 844 ret = mt9m032_write(client, MT9M032_RESTART, 0); /* Restart off */ 845 if (ret < 0) 846 goto error_entity; 847 msleep(100); 848 ret = update_formatter2(sensor, false); 849 if (ret < 0) 850 goto error_entity; 851 852 return ret; 853 854error_entity: 855 media_entity_cleanup(&sensor->subdev.entity); 856error_ctrl: 857 v4l2_ctrl_handler_free(&sensor->ctrls); 858error_sensor: 859 mutex_destroy(&sensor->lock); 860 return ret; 861} 862 863static int mt9m032_remove(struct i2c_client *client) 864{ 865 struct v4l2_subdev *subdev = i2c_get_clientdata(client); 866 struct mt9m032 *sensor = to_mt9m032(subdev); 867 868 v4l2_device_unregister_subdev(subdev); 869 v4l2_ctrl_handler_free(&sensor->ctrls); 870 media_entity_cleanup(&subdev->entity); 871 mutex_destroy(&sensor->lock); 872 return 0; 873} 874 875static const struct i2c_device_id mt9m032_id_table[] = { 876 { MT9M032_NAME, 0 }, 877 { } 878}; 879 880MODULE_DEVICE_TABLE(i2c, mt9m032_id_table); 881 882static struct i2c_driver mt9m032_i2c_driver = { 883 .driver = { 884 .name = MT9M032_NAME, 885 }, 886 .probe = mt9m032_probe, 887 .remove = mt9m032_remove, 888 .id_table = mt9m032_id_table, 889}; 890 891module_i2c_driver(mt9m032_i2c_driver); 892 893MODULE_AUTHOR("Martin Hostettler <martin@neutronstar.dyndns.org>"); 894MODULE_DESCRIPTION("MT9M032 camera sensor driver"); 895MODULE_LICENSE("GPL v2"); 896