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_pad_config *cfg, 321 struct v4l2_subdev_mbus_code_enum *code) 322{ 323 if (code->index != 0) 324 return -EINVAL; 325 326 code->code = MEDIA_BUS_FMT_Y8_1X8; 327 return 0; 328} 329 330static int mt9m032_enum_frame_size(struct v4l2_subdev *subdev, 331 struct v4l2_subdev_pad_config *cfg, 332 struct v4l2_subdev_frame_size_enum *fse) 333{ 334 if (fse->index != 0 || fse->code != MEDIA_BUS_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 * @cfg: v4l2_subdev_pad_config 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_pad_config *cfg, 355 enum v4l2_subdev_format_whence which) 356{ 357 switch (which) { 358 case V4L2_SUBDEV_FORMAT_TRY: 359 return v4l2_subdev_get_try_crop(&sensor->subdev, cfg, 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 * @cfg: v4l2_subdev_pad_config 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_pad_config *cfg, 377 enum v4l2_subdev_format_whence which) 378{ 379 switch (which) { 380 case V4L2_SUBDEV_FORMAT_TRY: 381 return v4l2_subdev_get_try_format(&sensor->subdev, cfg, 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_pad_config *cfg, 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, cfg, 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_pad_config *cfg, 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, cfg, fmt->which); 418 ret = 0; 419 420done: 421 mutex_unlock(&sensor->lock); 422 return ret; 423} 424 425static int mt9m032_get_pad_selection(struct v4l2_subdev *subdev, 426 struct v4l2_subdev_pad_config *cfg, 427 struct v4l2_subdev_selection *sel) 428{ 429 struct mt9m032 *sensor = to_mt9m032(subdev); 430 431 if (sel->target != V4L2_SEL_TGT_CROP) 432 return -EINVAL; 433 434 mutex_lock(&sensor->lock); 435 sel->r = *__mt9m032_get_pad_crop(sensor, cfg, sel->which); 436 mutex_unlock(&sensor->lock); 437 438 return 0; 439} 440 441static int mt9m032_set_pad_selection(struct v4l2_subdev *subdev, 442 struct v4l2_subdev_pad_config *cfg, 443 struct v4l2_subdev_selection *sel) 444{ 445 struct mt9m032 *sensor = to_mt9m032(subdev); 446 struct v4l2_mbus_framefmt *format; 447 struct v4l2_rect *__crop; 448 struct v4l2_rect rect; 449 int ret = 0; 450 451 if (sel->target != V4L2_SEL_TGT_CROP) 452 return -EINVAL; 453 454 mutex_lock(&sensor->lock); 455 456 if (sensor->streaming && sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) { 457 ret = -EBUSY; 458 goto done; 459 } 460 461 /* Clamp the crop rectangle boundaries and align them to a multiple of 2 462 * pixels to ensure a GRBG Bayer pattern. 463 */ 464 rect.left = clamp(ALIGN(sel->r.left, 2), MT9M032_COLUMN_START_MIN, 465 MT9M032_COLUMN_START_MAX); 466 rect.top = clamp(ALIGN(sel->r.top, 2), MT9M032_ROW_START_MIN, 467 MT9M032_ROW_START_MAX); 468 rect.width = clamp_t(unsigned int, ALIGN(sel->r.width, 2), 469 MT9M032_COLUMN_SIZE_MIN, MT9M032_COLUMN_SIZE_MAX); 470 rect.height = clamp_t(unsigned int, ALIGN(sel->r.height, 2), 471 MT9M032_ROW_SIZE_MIN, MT9M032_ROW_SIZE_MAX); 472 473 rect.width = min_t(unsigned int, rect.width, 474 MT9M032_PIXEL_ARRAY_WIDTH - rect.left); 475 rect.height = min_t(unsigned int, rect.height, 476 MT9M032_PIXEL_ARRAY_HEIGHT - rect.top); 477 478 __crop = __mt9m032_get_pad_crop(sensor, cfg, sel->which); 479 480 if (rect.width != __crop->width || rect.height != __crop->height) { 481 /* Reset the output image size if the crop rectangle size has 482 * been modified. 483 */ 484 format = __mt9m032_get_pad_format(sensor, cfg, sel->which); 485 format->width = rect.width; 486 format->height = rect.height; 487 } 488 489 *__crop = rect; 490 sel->r = rect; 491 492 if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) 493 ret = mt9m032_update_geom_timing(sensor); 494 495done: 496 mutex_unlock(&sensor->lock); 497 return ret; 498} 499 500static int mt9m032_get_frame_interval(struct v4l2_subdev *subdev, 501 struct v4l2_subdev_frame_interval *fi) 502{ 503 struct mt9m032 *sensor = to_mt9m032(subdev); 504 505 mutex_lock(&sensor->lock); 506 memset(fi, 0, sizeof(*fi)); 507 fi->interval = sensor->frame_interval; 508 mutex_unlock(&sensor->lock); 509 510 return 0; 511} 512 513static int mt9m032_set_frame_interval(struct v4l2_subdev *subdev, 514 struct v4l2_subdev_frame_interval *fi) 515{ 516 struct mt9m032 *sensor = to_mt9m032(subdev); 517 int ret; 518 519 mutex_lock(&sensor->lock); 520 521 if (sensor->streaming) { 522 ret = -EBUSY; 523 goto done; 524 } 525 526 /* Avoid divisions by 0. */ 527 if (fi->interval.denominator == 0) 528 fi->interval.denominator = 1; 529 530 ret = mt9m032_update_timing(sensor, &fi->interval); 531 if (!ret) 532 sensor->frame_interval = fi->interval; 533 534done: 535 mutex_unlock(&sensor->lock); 536 return ret; 537} 538 539static int mt9m032_s_stream(struct v4l2_subdev *subdev, int streaming) 540{ 541 struct mt9m032 *sensor = to_mt9m032(subdev); 542 int ret; 543 544 mutex_lock(&sensor->lock); 545 ret = update_formatter2(sensor, streaming); 546 if (!ret) 547 sensor->streaming = streaming; 548 mutex_unlock(&sensor->lock); 549 550 return ret; 551} 552 553/* ----------------------------------------------------------------------------- 554 * V4L2 subdev core operations 555 */ 556 557#ifdef CONFIG_VIDEO_ADV_DEBUG 558static int mt9m032_g_register(struct v4l2_subdev *sd, 559 struct v4l2_dbg_register *reg) 560{ 561 struct mt9m032 *sensor = to_mt9m032(sd); 562 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev); 563 int val; 564 565 if (reg->reg > 0xff) 566 return -EINVAL; 567 568 val = mt9m032_read(client, reg->reg); 569 if (val < 0) 570 return -EIO; 571 572 reg->size = 2; 573 reg->val = val; 574 575 return 0; 576} 577 578static int mt9m032_s_register(struct v4l2_subdev *sd, 579 const struct v4l2_dbg_register *reg) 580{ 581 struct mt9m032 *sensor = to_mt9m032(sd); 582 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev); 583 584 if (reg->reg > 0xff) 585 return -EINVAL; 586 587 return mt9m032_write(client, reg->reg, reg->val); 588} 589#endif 590 591/* ----------------------------------------------------------------------------- 592 * V4L2 subdev control operations 593 */ 594 595static int update_read_mode2(struct mt9m032 *sensor, bool vflip, bool hflip) 596{ 597 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev); 598 int reg_val = (vflip << MT9M032_READ_MODE2_VFLIP_SHIFT) 599 | (hflip << MT9M032_READ_MODE2_HFLIP_SHIFT) 600 | MT9M032_READ_MODE2_ROW_BLC 601 | 0x0007; 602 603 return mt9m032_write(client, MT9M032_READ_MODE2, reg_val); 604} 605 606static int mt9m032_set_gain(struct mt9m032 *sensor, s32 val) 607{ 608 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev); 609 int digital_gain_val; /* in 1/8th (0..127) */ 610 int analog_mul; /* 0 or 1 */ 611 int analog_gain_val; /* in 1/16th. (0..63) */ 612 u16 reg_val; 613 614 digital_gain_val = 51; /* from setup example */ 615 616 if (val < 63) { 617 analog_mul = 0; 618 analog_gain_val = val; 619 } else { 620 analog_mul = 1; 621 analog_gain_val = val / 2; 622 } 623 624 /* a_gain = (1 + analog_mul) + (analog_gain_val + 1) / 16 */ 625 /* overall_gain = a_gain * (1 + digital_gain_val / 8) */ 626 627 reg_val = ((digital_gain_val & MT9M032_GAIN_DIGITAL_MASK) 628 << MT9M032_GAIN_DIGITAL_SHIFT) 629 | ((analog_mul & 1) << MT9M032_GAIN_AMUL_SHIFT) 630 | (analog_gain_val & MT9M032_GAIN_ANALOG_MASK); 631 632 return mt9m032_write(client, MT9M032_GAIN_ALL, reg_val); 633} 634 635static int mt9m032_try_ctrl(struct v4l2_ctrl *ctrl) 636{ 637 if (ctrl->id == V4L2_CID_GAIN && ctrl->val >= 63) { 638 /* round because of multiplier used for values >= 63 */ 639 ctrl->val &= ~1; 640 } 641 642 return 0; 643} 644 645static int mt9m032_set_ctrl(struct v4l2_ctrl *ctrl) 646{ 647 struct mt9m032 *sensor = 648 container_of(ctrl->handler, struct mt9m032, ctrls); 649 struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev); 650 int ret; 651 652 switch (ctrl->id) { 653 case V4L2_CID_GAIN: 654 return mt9m032_set_gain(sensor, ctrl->val); 655 656 case V4L2_CID_HFLIP: 657 /* case V4L2_CID_VFLIP: -- In the same cluster */ 658 return update_read_mode2(sensor, sensor->vflip->val, 659 sensor->hflip->val); 660 661 case V4L2_CID_EXPOSURE: 662 ret = mt9m032_write(client, MT9M032_SHUTTER_WIDTH_HIGH, 663 (ctrl->val >> 16) & 0xffff); 664 if (ret < 0) 665 return ret; 666 667 return mt9m032_write(client, MT9M032_SHUTTER_WIDTH_LOW, 668 ctrl->val & 0xffff); 669 } 670 671 return 0; 672} 673 674static struct v4l2_ctrl_ops mt9m032_ctrl_ops = { 675 .s_ctrl = mt9m032_set_ctrl, 676 .try_ctrl = mt9m032_try_ctrl, 677}; 678 679/* -------------------------------------------------------------------------- */ 680 681static const struct v4l2_subdev_core_ops mt9m032_core_ops = { 682#ifdef CONFIG_VIDEO_ADV_DEBUG 683 .g_register = mt9m032_g_register, 684 .s_register = mt9m032_s_register, 685#endif 686}; 687 688static const struct v4l2_subdev_video_ops mt9m032_video_ops = { 689 .s_stream = mt9m032_s_stream, 690 .g_frame_interval = mt9m032_get_frame_interval, 691 .s_frame_interval = mt9m032_set_frame_interval, 692}; 693 694static const struct v4l2_subdev_pad_ops mt9m032_pad_ops = { 695 .enum_mbus_code = mt9m032_enum_mbus_code, 696 .enum_frame_size = mt9m032_enum_frame_size, 697 .get_fmt = mt9m032_get_pad_format, 698 .set_fmt = mt9m032_set_pad_format, 699 .set_selection = mt9m032_set_pad_selection, 700 .get_selection = mt9m032_get_pad_selection, 701}; 702 703static const struct v4l2_subdev_ops mt9m032_ops = { 704 .core = &mt9m032_core_ops, 705 .video = &mt9m032_video_ops, 706 .pad = &mt9m032_pad_ops, 707}; 708 709/* ----------------------------------------------------------------------------- 710 * Driver initialization and probing 711 */ 712 713static int mt9m032_probe(struct i2c_client *client, 714 const struct i2c_device_id *devid) 715{ 716 struct mt9m032_platform_data *pdata = client->dev.platform_data; 717 struct i2c_adapter *adapter = client->adapter; 718 struct mt9m032 *sensor; 719 int chip_version; 720 int ret; 721 722 if (pdata == NULL) { 723 dev_err(&client->dev, "No platform data\n"); 724 return -EINVAL; 725 } 726 727 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) { 728 dev_warn(&client->dev, 729 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); 730 return -EIO; 731 } 732 733 if (!client->dev.platform_data) 734 return -ENODEV; 735 736 sensor = devm_kzalloc(&client->dev, sizeof(*sensor), GFP_KERNEL); 737 if (sensor == NULL) 738 return -ENOMEM; 739 740 mutex_init(&sensor->lock); 741 742 sensor->pdata = pdata; 743 744 v4l2_i2c_subdev_init(&sensor->subdev, client, &mt9m032_ops); 745 sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; 746 747 chip_version = mt9m032_read(client, MT9M032_CHIP_VERSION); 748 if (chip_version != MT9M032_CHIP_VERSION_VALUE) { 749 dev_err(&client->dev, "MT9M032 not detected, wrong version " 750 "0x%04x\n", chip_version); 751 ret = -ENODEV; 752 goto error_sensor; 753 } 754 755 dev_info(&client->dev, "MT9M032 detected at address 0x%02x\n", 756 client->addr); 757 758 sensor->frame_interval.numerator = 1; 759 sensor->frame_interval.denominator = 30; 760 761 sensor->crop.left = MT9M032_COLUMN_START_DEF; 762 sensor->crop.top = MT9M032_ROW_START_DEF; 763 sensor->crop.width = MT9M032_COLUMN_SIZE_DEF; 764 sensor->crop.height = MT9M032_ROW_SIZE_DEF; 765 766 sensor->format.width = sensor->crop.width; 767 sensor->format.height = sensor->crop.height; 768 sensor->format.code = MEDIA_BUS_FMT_Y8_1X8; 769 sensor->format.field = V4L2_FIELD_NONE; 770 sensor->format.colorspace = V4L2_COLORSPACE_SRGB; 771 772 v4l2_ctrl_handler_init(&sensor->ctrls, 5); 773 774 v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops, 775 V4L2_CID_GAIN, 0, 127, 1, 64); 776 777 sensor->hflip = v4l2_ctrl_new_std(&sensor->ctrls, 778 &mt9m032_ctrl_ops, 779 V4L2_CID_HFLIP, 0, 1, 1, 0); 780 sensor->vflip = v4l2_ctrl_new_std(&sensor->ctrls, 781 &mt9m032_ctrl_ops, 782 V4L2_CID_VFLIP, 0, 1, 1, 0); 783 784 v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops, 785 V4L2_CID_EXPOSURE, MT9M032_SHUTTER_WIDTH_MIN, 786 MT9M032_SHUTTER_WIDTH_MAX, 1, 787 MT9M032_SHUTTER_WIDTH_DEF); 788 v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops, 789 V4L2_CID_PIXEL_RATE, pdata->pix_clock, 790 pdata->pix_clock, 1, pdata->pix_clock); 791 792 if (sensor->ctrls.error) { 793 ret = sensor->ctrls.error; 794 dev_err(&client->dev, "control initialization error %d\n", ret); 795 goto error_ctrl; 796 } 797 798 v4l2_ctrl_cluster(2, &sensor->hflip); 799 800 sensor->subdev.ctrl_handler = &sensor->ctrls; 801 sensor->pad.flags = MEDIA_PAD_FL_SOURCE; 802 ret = media_entity_init(&sensor->subdev.entity, 1, &sensor->pad, 0); 803 if (ret < 0) 804 goto error_ctrl; 805 806 ret = mt9m032_write(client, MT9M032_RESET, 1); /* reset on */ 807 if (ret < 0) 808 goto error_entity; 809 ret = mt9m032_write(client, MT9M032_RESET, 0); /* reset off */ 810 if (ret < 0) 811 goto error_entity; 812 813 ret = mt9m032_setup_pll(sensor); 814 if (ret < 0) 815 goto error_entity; 816 usleep_range(10000, 11000); 817 818 ret = v4l2_ctrl_handler_setup(&sensor->ctrls); 819 if (ret < 0) 820 goto error_entity; 821 822 /* SIZE */ 823 ret = mt9m032_update_geom_timing(sensor); 824 if (ret < 0) 825 goto error_entity; 826 827 ret = mt9m032_write(client, 0x41, 0x0000); /* reserved !!! */ 828 if (ret < 0) 829 goto error_entity; 830 ret = mt9m032_write(client, 0x42, 0x0003); /* reserved !!! */ 831 if (ret < 0) 832 goto error_entity; 833 ret = mt9m032_write(client, 0x43, 0x0003); /* reserved !!! */ 834 if (ret < 0) 835 goto error_entity; 836 ret = mt9m032_write(client, 0x7f, 0x0000); /* reserved !!! */ 837 if (ret < 0) 838 goto error_entity; 839 if (sensor->pdata->invert_pixclock) { 840 ret = mt9m032_write(client, MT9M032_PIX_CLK_CTRL, 841 MT9M032_PIX_CLK_CTRL_INV_PIXCLK); 842 if (ret < 0) 843 goto error_entity; 844 } 845 846 ret = mt9m032_write(client, MT9M032_RESTART, 1); /* Restart on */ 847 if (ret < 0) 848 goto error_entity; 849 msleep(100); 850 ret = mt9m032_write(client, MT9M032_RESTART, 0); /* Restart off */ 851 if (ret < 0) 852 goto error_entity; 853 msleep(100); 854 ret = update_formatter2(sensor, false); 855 if (ret < 0) 856 goto error_entity; 857 858 return ret; 859 860error_entity: 861 media_entity_cleanup(&sensor->subdev.entity); 862error_ctrl: 863 v4l2_ctrl_handler_free(&sensor->ctrls); 864error_sensor: 865 mutex_destroy(&sensor->lock); 866 return ret; 867} 868 869static int mt9m032_remove(struct i2c_client *client) 870{ 871 struct v4l2_subdev *subdev = i2c_get_clientdata(client); 872 struct mt9m032 *sensor = to_mt9m032(subdev); 873 874 v4l2_device_unregister_subdev(subdev); 875 v4l2_ctrl_handler_free(&sensor->ctrls); 876 media_entity_cleanup(&subdev->entity); 877 mutex_destroy(&sensor->lock); 878 return 0; 879} 880 881static const struct i2c_device_id mt9m032_id_table[] = { 882 { MT9M032_NAME, 0 }, 883 { } 884}; 885 886MODULE_DEVICE_TABLE(i2c, mt9m032_id_table); 887 888static struct i2c_driver mt9m032_i2c_driver = { 889 .driver = { 890 .name = MT9M032_NAME, 891 }, 892 .probe = mt9m032_probe, 893 .remove = mt9m032_remove, 894 .id_table = mt9m032_id_table, 895}; 896 897module_i2c_driver(mt9m032_i2c_driver); 898 899MODULE_AUTHOR("Martin Hostettler <martin@neutronstar.dyndns.org>"); 900MODULE_DESCRIPTION("MT9M032 camera sensor driver"); 901MODULE_LICENSE("GPL v2"); 902