1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Driver for MT9M001 CMOS Image Sensor from Micron 4 * 5 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de> 6 */ 7 8 #include <linux/clk.h> 9 #include <linux/delay.h> 10 #include <linux/gpio/consumer.h> 11 #include <linux/i2c.h> 12 #include <linux/log2.h> 13 #include <linux/module.h> 14 #include <linux/pm_runtime.h> 15 #include <linux/slab.h> 16 #include <linux/videodev2.h> 17 18 #include <media/v4l2-ctrls.h> 19 #include <media/v4l2-device.h> 20 #include <media/v4l2-event.h> 21 #include <media/v4l2-subdev.h> 22 23 /* 24 * mt9m001 i2c address 0x5d 25 */ 26 27 /* mt9m001 selected register addresses */ 28 #define MT9M001_CHIP_VERSION 0x00 29 #define MT9M001_ROW_START 0x01 30 #define MT9M001_COLUMN_START 0x02 31 #define MT9M001_WINDOW_HEIGHT 0x03 32 #define MT9M001_WINDOW_WIDTH 0x04 33 #define MT9M001_HORIZONTAL_BLANKING 0x05 34 #define MT9M001_VERTICAL_BLANKING 0x06 35 #define MT9M001_OUTPUT_CONTROL 0x07 36 #define MT9M001_SHUTTER_WIDTH 0x09 37 #define MT9M001_FRAME_RESTART 0x0b 38 #define MT9M001_SHUTTER_DELAY 0x0c 39 #define MT9M001_RESET 0x0d 40 #define MT9M001_READ_OPTIONS1 0x1e 41 #define MT9M001_READ_OPTIONS2 0x20 42 #define MT9M001_GLOBAL_GAIN 0x35 43 #define MT9M001_CHIP_ENABLE 0xF1 44 45 #define MT9M001_MAX_WIDTH 1280 46 #define MT9M001_MAX_HEIGHT 1024 47 #define MT9M001_MIN_WIDTH 48 48 #define MT9M001_MIN_HEIGHT 32 49 #define MT9M001_COLUMN_SKIP 20 50 #define MT9M001_ROW_SKIP 12 51 #define MT9M001_DEFAULT_HBLANK 9 52 #define MT9M001_DEFAULT_VBLANK 25 53 54 /* MT9M001 has only one fixed colorspace per pixelcode */ 55 struct mt9m001_datafmt { 56 u32 code; 57 enum v4l2_colorspace colorspace; 58 }; 59 60 /* Find a data format by a pixel code in an array */ 61 static const struct mt9m001_datafmt *mt9m001_find_datafmt( 62 u32 code, const struct mt9m001_datafmt *fmt, 63 int n) 64 { 65 int i; 66 for (i = 0; i < n; i++) 67 if (fmt[i].code == code) 68 return fmt + i; 69 70 return NULL; 71 } 72 73 static const struct mt9m001_datafmt mt9m001_colour_fmts[] = { 74 /* 75 * Order important: first natively supported, 76 * second supported with a GPIO extender 77 */ 78 {MEDIA_BUS_FMT_SBGGR10_1X10, V4L2_COLORSPACE_SRGB}, 79 {MEDIA_BUS_FMT_SBGGR8_1X8, V4L2_COLORSPACE_SRGB}, 80 }; 81 82 static const struct mt9m001_datafmt mt9m001_monochrome_fmts[] = { 83 /* Order important - see above */ 84 {MEDIA_BUS_FMT_Y10_1X10, V4L2_COLORSPACE_JPEG}, 85 {MEDIA_BUS_FMT_Y8_1X8, V4L2_COLORSPACE_JPEG}, 86 }; 87 88 struct mt9m001 { 89 struct v4l2_subdev subdev; 90 struct v4l2_ctrl_handler hdl; 91 struct { 92 /* exposure/auto-exposure cluster */ 93 struct v4l2_ctrl *autoexposure; 94 struct v4l2_ctrl *exposure; 95 }; 96 bool streaming; 97 struct mutex mutex; 98 struct v4l2_rect rect; /* Sensor window */ 99 struct clk *clk; 100 struct gpio_desc *standby_gpio; 101 struct gpio_desc *reset_gpio; 102 const struct mt9m001_datafmt *fmt; 103 const struct mt9m001_datafmt *fmts; 104 int num_fmts; 105 unsigned int total_h; 106 unsigned short y_skip_top; /* Lines to skip at the top */ 107 struct media_pad pad; 108 }; 109 110 static struct mt9m001 *to_mt9m001(const struct i2c_client *client) 111 { 112 return container_of(i2c_get_clientdata(client), struct mt9m001, subdev); 113 } 114 115 static int reg_read(struct i2c_client *client, const u8 reg) 116 { 117 return i2c_smbus_read_word_swapped(client, reg); 118 } 119 120 static int reg_write(struct i2c_client *client, const u8 reg, 121 const u16 data) 122 { 123 return i2c_smbus_write_word_swapped(client, reg, data); 124 } 125 126 static int reg_set(struct i2c_client *client, const u8 reg, 127 const u16 data) 128 { 129 int ret; 130 131 ret = reg_read(client, reg); 132 if (ret < 0) 133 return ret; 134 return reg_write(client, reg, ret | data); 135 } 136 137 static int reg_clear(struct i2c_client *client, const u8 reg, 138 const u16 data) 139 { 140 int ret; 141 142 ret = reg_read(client, reg); 143 if (ret < 0) 144 return ret; 145 return reg_write(client, reg, ret & ~data); 146 } 147 148 struct mt9m001_reg { 149 u8 reg; 150 u16 data; 151 }; 152 153 static int multi_reg_write(struct i2c_client *client, 154 const struct mt9m001_reg *regs, int num) 155 { 156 int i; 157 158 for (i = 0; i < num; i++) { 159 int ret = reg_write(client, regs[i].reg, regs[i].data); 160 161 if (ret) 162 return ret; 163 } 164 165 return 0; 166 } 167 168 static int mt9m001_init(struct i2c_client *client) 169 { 170 static const struct mt9m001_reg init_regs[] = { 171 /* 172 * Issue a soft reset. This returns all registers to their 173 * default values. 174 */ 175 { MT9M001_RESET, 1 }, 176 { MT9M001_RESET, 0 }, 177 /* Disable chip, synchronous option update */ 178 { MT9M001_OUTPUT_CONTROL, 0 } 179 }; 180 181 dev_dbg(&client->dev, "%s\n", __func__); 182 183 return multi_reg_write(client, init_regs, ARRAY_SIZE(init_regs)); 184 } 185 186 static int mt9m001_apply_selection(struct v4l2_subdev *sd) 187 { 188 struct i2c_client *client = v4l2_get_subdevdata(sd); 189 struct mt9m001 *mt9m001 = to_mt9m001(client); 190 const struct mt9m001_reg regs[] = { 191 /* Blanking and start values - default... */ 192 { MT9M001_HORIZONTAL_BLANKING, MT9M001_DEFAULT_HBLANK }, 193 { MT9M001_VERTICAL_BLANKING, MT9M001_DEFAULT_VBLANK }, 194 /* 195 * The caller provides a supported format, as verified per 196 * call to .set_fmt(FORMAT_TRY). 197 */ 198 { MT9M001_COLUMN_START, mt9m001->rect.left }, 199 { MT9M001_ROW_START, mt9m001->rect.top }, 200 { MT9M001_WINDOW_WIDTH, mt9m001->rect.width - 1 }, 201 { MT9M001_WINDOW_HEIGHT, 202 mt9m001->rect.height + mt9m001->y_skip_top - 1 }, 203 }; 204 205 return multi_reg_write(client, regs, ARRAY_SIZE(regs)); 206 } 207 208 static int mt9m001_s_stream(struct v4l2_subdev *sd, int enable) 209 { 210 struct i2c_client *client = v4l2_get_subdevdata(sd); 211 struct mt9m001 *mt9m001 = to_mt9m001(client); 212 int ret = 0; 213 214 mutex_lock(&mt9m001->mutex); 215 216 if (mt9m001->streaming == enable) 217 goto done; 218 219 if (enable) { 220 ret = pm_runtime_get_sync(&client->dev); 221 if (ret < 0) 222 goto put_unlock; 223 224 ret = mt9m001_apply_selection(sd); 225 if (ret) 226 goto put_unlock; 227 228 ret = __v4l2_ctrl_handler_setup(&mt9m001->hdl); 229 if (ret) 230 goto put_unlock; 231 232 /* Switch to master "normal" mode */ 233 ret = reg_write(client, MT9M001_OUTPUT_CONTROL, 2); 234 if (ret < 0) 235 goto put_unlock; 236 } else { 237 /* Switch to master stop sensor readout */ 238 reg_write(client, MT9M001_OUTPUT_CONTROL, 0); 239 pm_runtime_put(&client->dev); 240 } 241 242 mt9m001->streaming = enable; 243 done: 244 mutex_unlock(&mt9m001->mutex); 245 246 return 0; 247 248 put_unlock: 249 pm_runtime_put(&client->dev); 250 mutex_unlock(&mt9m001->mutex); 251 252 return ret; 253 } 254 255 static int mt9m001_set_selection(struct v4l2_subdev *sd, 256 struct v4l2_subdev_pad_config *cfg, 257 struct v4l2_subdev_selection *sel) 258 { 259 struct i2c_client *client = v4l2_get_subdevdata(sd); 260 struct mt9m001 *mt9m001 = to_mt9m001(client); 261 struct v4l2_rect rect = sel->r; 262 263 if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE || 264 sel->target != V4L2_SEL_TGT_CROP) 265 return -EINVAL; 266 267 if (mt9m001->fmts == mt9m001_colour_fmts) 268 /* 269 * Bayer format - even number of rows for simplicity, 270 * but let the user play with the top row. 271 */ 272 rect.height = ALIGN(rect.height, 2); 273 274 /* Datasheet requirement: see register description */ 275 rect.width = ALIGN(rect.width, 2); 276 rect.left = ALIGN(rect.left, 2); 277 278 rect.width = clamp_t(u32, rect.width, MT9M001_MIN_WIDTH, 279 MT9M001_MAX_WIDTH); 280 rect.left = clamp_t(u32, rect.left, MT9M001_COLUMN_SKIP, 281 MT9M001_COLUMN_SKIP + MT9M001_MAX_WIDTH - rect.width); 282 283 rect.height = clamp_t(u32, rect.height, MT9M001_MIN_HEIGHT, 284 MT9M001_MAX_HEIGHT); 285 rect.top = clamp_t(u32, rect.top, MT9M001_ROW_SKIP, 286 MT9M001_ROW_SKIP + MT9M001_MAX_HEIGHT - rect.height); 287 288 mt9m001->total_h = rect.height + mt9m001->y_skip_top + 289 MT9M001_DEFAULT_VBLANK; 290 291 mt9m001->rect = rect; 292 293 return 0; 294 } 295 296 static int mt9m001_get_selection(struct v4l2_subdev *sd, 297 struct v4l2_subdev_pad_config *cfg, 298 struct v4l2_subdev_selection *sel) 299 { 300 struct i2c_client *client = v4l2_get_subdevdata(sd); 301 struct mt9m001 *mt9m001 = to_mt9m001(client); 302 303 if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE) 304 return -EINVAL; 305 306 switch (sel->target) { 307 case V4L2_SEL_TGT_CROP_BOUNDS: 308 sel->r.left = MT9M001_COLUMN_SKIP; 309 sel->r.top = MT9M001_ROW_SKIP; 310 sel->r.width = MT9M001_MAX_WIDTH; 311 sel->r.height = MT9M001_MAX_HEIGHT; 312 return 0; 313 case V4L2_SEL_TGT_CROP: 314 sel->r = mt9m001->rect; 315 return 0; 316 default: 317 return -EINVAL; 318 } 319 } 320 321 static int mt9m001_get_fmt(struct v4l2_subdev *sd, 322 struct v4l2_subdev_pad_config *cfg, 323 struct v4l2_subdev_format *format) 324 { 325 struct i2c_client *client = v4l2_get_subdevdata(sd); 326 struct mt9m001 *mt9m001 = to_mt9m001(client); 327 struct v4l2_mbus_framefmt *mf = &format->format; 328 329 if (format->pad) 330 return -EINVAL; 331 332 if (format->which == V4L2_SUBDEV_FORMAT_TRY) { 333 mf = v4l2_subdev_get_try_format(sd, cfg, 0); 334 format->format = *mf; 335 return 0; 336 } 337 338 mf->width = mt9m001->rect.width; 339 mf->height = mt9m001->rect.height; 340 mf->code = mt9m001->fmt->code; 341 mf->colorspace = mt9m001->fmt->colorspace; 342 mf->field = V4L2_FIELD_NONE; 343 mf->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; 344 mf->quantization = V4L2_QUANTIZATION_DEFAULT; 345 mf->xfer_func = V4L2_XFER_FUNC_DEFAULT; 346 347 return 0; 348 } 349 350 static int mt9m001_s_fmt(struct v4l2_subdev *sd, 351 const struct mt9m001_datafmt *fmt, 352 struct v4l2_mbus_framefmt *mf) 353 { 354 struct i2c_client *client = v4l2_get_subdevdata(sd); 355 struct mt9m001 *mt9m001 = to_mt9m001(client); 356 struct v4l2_subdev_selection sel = { 357 .which = V4L2_SUBDEV_FORMAT_ACTIVE, 358 .target = V4L2_SEL_TGT_CROP, 359 .r.left = mt9m001->rect.left, 360 .r.top = mt9m001->rect.top, 361 .r.width = mf->width, 362 .r.height = mf->height, 363 }; 364 int ret; 365 366 /* No support for scaling so far, just crop. TODO: use skipping */ 367 ret = mt9m001_set_selection(sd, NULL, &sel); 368 if (!ret) { 369 mf->width = mt9m001->rect.width; 370 mf->height = mt9m001->rect.height; 371 mt9m001->fmt = fmt; 372 mf->colorspace = fmt->colorspace; 373 } 374 375 return ret; 376 } 377 378 static int mt9m001_set_fmt(struct v4l2_subdev *sd, 379 struct v4l2_subdev_pad_config *cfg, 380 struct v4l2_subdev_format *format) 381 { 382 struct v4l2_mbus_framefmt *mf = &format->format; 383 struct i2c_client *client = v4l2_get_subdevdata(sd); 384 struct mt9m001 *mt9m001 = to_mt9m001(client); 385 const struct mt9m001_datafmt *fmt; 386 387 if (format->pad) 388 return -EINVAL; 389 390 v4l_bound_align_image(&mf->width, MT9M001_MIN_WIDTH, 391 MT9M001_MAX_WIDTH, 1, 392 &mf->height, MT9M001_MIN_HEIGHT + mt9m001->y_skip_top, 393 MT9M001_MAX_HEIGHT + mt9m001->y_skip_top, 0, 0); 394 395 if (mt9m001->fmts == mt9m001_colour_fmts) 396 mf->height = ALIGN(mf->height - 1, 2); 397 398 fmt = mt9m001_find_datafmt(mf->code, mt9m001->fmts, 399 mt9m001->num_fmts); 400 if (!fmt) { 401 fmt = mt9m001->fmt; 402 mf->code = fmt->code; 403 } 404 405 mf->colorspace = fmt->colorspace; 406 mf->field = V4L2_FIELD_NONE; 407 mf->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; 408 mf->quantization = V4L2_QUANTIZATION_DEFAULT; 409 mf->xfer_func = V4L2_XFER_FUNC_DEFAULT; 410 411 if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) 412 return mt9m001_s_fmt(sd, fmt, mf); 413 cfg->try_fmt = *mf; 414 return 0; 415 } 416 417 #ifdef CONFIG_VIDEO_ADV_DEBUG 418 static int mt9m001_g_register(struct v4l2_subdev *sd, 419 struct v4l2_dbg_register *reg) 420 { 421 struct i2c_client *client = v4l2_get_subdevdata(sd); 422 423 if (reg->reg > 0xff) 424 return -EINVAL; 425 426 reg->size = 2; 427 reg->val = reg_read(client, reg->reg); 428 429 if (reg->val > 0xffff) 430 return -EIO; 431 432 return 0; 433 } 434 435 static int mt9m001_s_register(struct v4l2_subdev *sd, 436 const struct v4l2_dbg_register *reg) 437 { 438 struct i2c_client *client = v4l2_get_subdevdata(sd); 439 440 if (reg->reg > 0xff) 441 return -EINVAL; 442 443 if (reg_write(client, reg->reg, reg->val) < 0) 444 return -EIO; 445 446 return 0; 447 } 448 #endif 449 450 static int mt9m001_power_on(struct device *dev) 451 { 452 struct i2c_client *client = to_i2c_client(dev); 453 struct mt9m001 *mt9m001 = to_mt9m001(client); 454 int ret; 455 456 ret = clk_prepare_enable(mt9m001->clk); 457 if (ret) 458 return ret; 459 460 if (mt9m001->standby_gpio) { 461 gpiod_set_value_cansleep(mt9m001->standby_gpio, 0); 462 usleep_range(1000, 2000); 463 } 464 465 if (mt9m001->reset_gpio) { 466 gpiod_set_value_cansleep(mt9m001->reset_gpio, 1); 467 usleep_range(1000, 2000); 468 gpiod_set_value_cansleep(mt9m001->reset_gpio, 0); 469 usleep_range(1000, 2000); 470 } 471 472 return 0; 473 } 474 475 static int mt9m001_power_off(struct device *dev) 476 { 477 struct i2c_client *client = to_i2c_client(dev); 478 struct mt9m001 *mt9m001 = to_mt9m001(client); 479 480 gpiod_set_value_cansleep(mt9m001->standby_gpio, 1); 481 clk_disable_unprepare(mt9m001->clk); 482 483 return 0; 484 } 485 486 static int mt9m001_g_volatile_ctrl(struct v4l2_ctrl *ctrl) 487 { 488 struct mt9m001 *mt9m001 = container_of(ctrl->handler, 489 struct mt9m001, hdl); 490 s32 min, max; 491 492 switch (ctrl->id) { 493 case V4L2_CID_EXPOSURE_AUTO: 494 min = mt9m001->exposure->minimum; 495 max = mt9m001->exposure->maximum; 496 mt9m001->exposure->val = 497 (524 + (mt9m001->total_h - 1) * (max - min)) / 1048 + min; 498 break; 499 } 500 return 0; 501 } 502 503 static int mt9m001_s_ctrl(struct v4l2_ctrl *ctrl) 504 { 505 struct mt9m001 *mt9m001 = container_of(ctrl->handler, 506 struct mt9m001, hdl); 507 struct v4l2_subdev *sd = &mt9m001->subdev; 508 struct i2c_client *client = v4l2_get_subdevdata(sd); 509 struct v4l2_ctrl *exp = mt9m001->exposure; 510 int data; 511 int ret; 512 513 if (!pm_runtime_get_if_in_use(&client->dev)) 514 return 0; 515 516 switch (ctrl->id) { 517 case V4L2_CID_VFLIP: 518 if (ctrl->val) 519 ret = reg_set(client, MT9M001_READ_OPTIONS2, 0x8000); 520 else 521 ret = reg_clear(client, MT9M001_READ_OPTIONS2, 0x8000); 522 break; 523 524 case V4L2_CID_GAIN: 525 /* See Datasheet Table 7, Gain settings. */ 526 if (ctrl->val <= ctrl->default_value) { 527 /* Pack it into 0..1 step 0.125, register values 0..8 */ 528 unsigned long range = ctrl->default_value - ctrl->minimum; 529 data = ((ctrl->val - (s32)ctrl->minimum) * 8 + range / 2) / range; 530 531 dev_dbg(&client->dev, "Setting gain %d\n", data); 532 ret = reg_write(client, MT9M001_GLOBAL_GAIN, data); 533 } else { 534 /* Pack it into 1.125..15 variable step, register values 9..67 */ 535 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */ 536 unsigned long range = ctrl->maximum - ctrl->default_value - 1; 537 unsigned long gain = ((ctrl->val - (s32)ctrl->default_value - 1) * 538 111 + range / 2) / range + 9; 539 540 if (gain <= 32) 541 data = gain; 542 else if (gain <= 64) 543 data = ((gain - 32) * 16 + 16) / 32 + 80; 544 else 545 data = ((gain - 64) * 7 + 28) / 56 + 96; 546 547 dev_dbg(&client->dev, "Setting gain from %d to %d\n", 548 reg_read(client, MT9M001_GLOBAL_GAIN), data); 549 ret = reg_write(client, MT9M001_GLOBAL_GAIN, data); 550 } 551 break; 552 553 case V4L2_CID_EXPOSURE_AUTO: 554 if (ctrl->val == V4L2_EXPOSURE_MANUAL) { 555 unsigned long range = exp->maximum - exp->minimum; 556 unsigned long shutter = ((exp->val - (s32)exp->minimum) * 1048 + 557 range / 2) / range + 1; 558 559 dev_dbg(&client->dev, 560 "Setting shutter width from %d to %lu\n", 561 reg_read(client, MT9M001_SHUTTER_WIDTH), shutter); 562 ret = reg_write(client, MT9M001_SHUTTER_WIDTH, shutter); 563 } else { 564 mt9m001->total_h = mt9m001->rect.height + 565 mt9m001->y_skip_top + MT9M001_DEFAULT_VBLANK; 566 ret = reg_write(client, MT9M001_SHUTTER_WIDTH, 567 mt9m001->total_h); 568 } 569 break; 570 default: 571 ret = -EINVAL; 572 break; 573 } 574 575 pm_runtime_put(&client->dev); 576 577 return ret; 578 } 579 580 /* 581 * Interface active, can use i2c. If it fails, it can indeed mean, that 582 * this wasn't our capture interface, so, we wait for the right one 583 */ 584 static int mt9m001_video_probe(struct i2c_client *client) 585 { 586 struct mt9m001 *mt9m001 = to_mt9m001(client); 587 s32 data; 588 int ret; 589 590 /* Enable the chip */ 591 data = reg_write(client, MT9M001_CHIP_ENABLE, 1); 592 dev_dbg(&client->dev, "write: %d\n", data); 593 594 /* Read out the chip version register */ 595 data = reg_read(client, MT9M001_CHIP_VERSION); 596 597 /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */ 598 switch (data) { 599 case 0x8411: 600 case 0x8421: 601 mt9m001->fmts = mt9m001_colour_fmts; 602 mt9m001->num_fmts = ARRAY_SIZE(mt9m001_colour_fmts); 603 break; 604 case 0x8431: 605 mt9m001->fmts = mt9m001_monochrome_fmts; 606 mt9m001->num_fmts = ARRAY_SIZE(mt9m001_monochrome_fmts); 607 break; 608 default: 609 dev_err(&client->dev, 610 "No MT9M001 chip detected, register read %x\n", data); 611 ret = -ENODEV; 612 goto done; 613 } 614 615 mt9m001->fmt = &mt9m001->fmts[0]; 616 617 dev_info(&client->dev, "Detected a MT9M001 chip ID %x (%s)\n", data, 618 data == 0x8431 ? "C12STM" : "C12ST"); 619 620 ret = mt9m001_init(client); 621 if (ret < 0) { 622 dev_err(&client->dev, "Failed to initialise the camera\n"); 623 goto done; 624 } 625 626 /* mt9m001_init() has reset the chip, returning registers to defaults */ 627 ret = v4l2_ctrl_handler_setup(&mt9m001->hdl); 628 629 done: 630 return ret; 631 } 632 633 static int mt9m001_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines) 634 { 635 struct i2c_client *client = v4l2_get_subdevdata(sd); 636 struct mt9m001 *mt9m001 = to_mt9m001(client); 637 638 *lines = mt9m001->y_skip_top; 639 640 return 0; 641 } 642 643 static const struct v4l2_ctrl_ops mt9m001_ctrl_ops = { 644 .g_volatile_ctrl = mt9m001_g_volatile_ctrl, 645 .s_ctrl = mt9m001_s_ctrl, 646 }; 647 648 static const struct v4l2_subdev_core_ops mt9m001_subdev_core_ops = { 649 .log_status = v4l2_ctrl_subdev_log_status, 650 .subscribe_event = v4l2_ctrl_subdev_subscribe_event, 651 .unsubscribe_event = v4l2_event_subdev_unsubscribe, 652 #ifdef CONFIG_VIDEO_ADV_DEBUG 653 .g_register = mt9m001_g_register, 654 .s_register = mt9m001_s_register, 655 #endif 656 }; 657 658 static int mt9m001_init_cfg(struct v4l2_subdev *sd, 659 struct v4l2_subdev_pad_config *cfg) 660 { 661 struct i2c_client *client = v4l2_get_subdevdata(sd); 662 struct mt9m001 *mt9m001 = to_mt9m001(client); 663 struct v4l2_mbus_framefmt *try_fmt = 664 v4l2_subdev_get_try_format(sd, cfg, 0); 665 666 try_fmt->width = MT9M001_MAX_WIDTH; 667 try_fmt->height = MT9M001_MAX_HEIGHT; 668 try_fmt->code = mt9m001->fmts[0].code; 669 try_fmt->colorspace = mt9m001->fmts[0].colorspace; 670 try_fmt->field = V4L2_FIELD_NONE; 671 try_fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; 672 try_fmt->quantization = V4L2_QUANTIZATION_DEFAULT; 673 try_fmt->xfer_func = V4L2_XFER_FUNC_DEFAULT; 674 675 return 0; 676 } 677 678 static int mt9m001_enum_mbus_code(struct v4l2_subdev *sd, 679 struct v4l2_subdev_pad_config *cfg, 680 struct v4l2_subdev_mbus_code_enum *code) 681 { 682 struct i2c_client *client = v4l2_get_subdevdata(sd); 683 struct mt9m001 *mt9m001 = to_mt9m001(client); 684 685 if (code->pad || code->index >= mt9m001->num_fmts) 686 return -EINVAL; 687 688 code->code = mt9m001->fmts[code->index].code; 689 return 0; 690 } 691 692 static int mt9m001_g_mbus_config(struct v4l2_subdev *sd, 693 struct v4l2_mbus_config *cfg) 694 { 695 /* MT9M001 has all capture_format parameters fixed */ 696 cfg->flags = V4L2_MBUS_PCLK_SAMPLE_FALLING | 697 V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH | 698 V4L2_MBUS_DATA_ACTIVE_HIGH | V4L2_MBUS_MASTER; 699 cfg->type = V4L2_MBUS_PARALLEL; 700 701 return 0; 702 } 703 704 static const struct v4l2_subdev_video_ops mt9m001_subdev_video_ops = { 705 .s_stream = mt9m001_s_stream, 706 .g_mbus_config = mt9m001_g_mbus_config, 707 }; 708 709 static const struct v4l2_subdev_sensor_ops mt9m001_subdev_sensor_ops = { 710 .g_skip_top_lines = mt9m001_g_skip_top_lines, 711 }; 712 713 static const struct v4l2_subdev_pad_ops mt9m001_subdev_pad_ops = { 714 .init_cfg = mt9m001_init_cfg, 715 .enum_mbus_code = mt9m001_enum_mbus_code, 716 .get_selection = mt9m001_get_selection, 717 .set_selection = mt9m001_set_selection, 718 .get_fmt = mt9m001_get_fmt, 719 .set_fmt = mt9m001_set_fmt, 720 }; 721 722 static const struct v4l2_subdev_ops mt9m001_subdev_ops = { 723 .core = &mt9m001_subdev_core_ops, 724 .video = &mt9m001_subdev_video_ops, 725 .sensor = &mt9m001_subdev_sensor_ops, 726 .pad = &mt9m001_subdev_pad_ops, 727 }; 728 729 static int mt9m001_probe(struct i2c_client *client) 730 { 731 struct mt9m001 *mt9m001; 732 struct i2c_adapter *adapter = client->adapter; 733 int ret; 734 735 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) { 736 dev_warn(&adapter->dev, 737 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); 738 return -EIO; 739 } 740 741 mt9m001 = devm_kzalloc(&client->dev, sizeof(*mt9m001), GFP_KERNEL); 742 if (!mt9m001) 743 return -ENOMEM; 744 745 mt9m001->clk = devm_clk_get(&client->dev, NULL); 746 if (IS_ERR(mt9m001->clk)) 747 return PTR_ERR(mt9m001->clk); 748 749 mt9m001->standby_gpio = devm_gpiod_get_optional(&client->dev, "standby", 750 GPIOD_OUT_LOW); 751 if (IS_ERR(mt9m001->standby_gpio)) 752 return PTR_ERR(mt9m001->standby_gpio); 753 754 mt9m001->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", 755 GPIOD_OUT_LOW); 756 if (IS_ERR(mt9m001->reset_gpio)) 757 return PTR_ERR(mt9m001->reset_gpio); 758 759 v4l2_i2c_subdev_init(&mt9m001->subdev, client, &mt9m001_subdev_ops); 760 mt9m001->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | 761 V4L2_SUBDEV_FL_HAS_EVENTS; 762 v4l2_ctrl_handler_init(&mt9m001->hdl, 4); 763 v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops, 764 V4L2_CID_VFLIP, 0, 1, 1, 0); 765 v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops, 766 V4L2_CID_GAIN, 0, 127, 1, 64); 767 mt9m001->exposure = v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops, 768 V4L2_CID_EXPOSURE, 1, 255, 1, 255); 769 /* 770 * Simulated autoexposure. If enabled, we calculate shutter width 771 * ourselves in the driver based on vertical blanking and frame width 772 */ 773 mt9m001->autoexposure = v4l2_ctrl_new_std_menu(&mt9m001->hdl, 774 &mt9m001_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0, 775 V4L2_EXPOSURE_AUTO); 776 mt9m001->subdev.ctrl_handler = &mt9m001->hdl; 777 if (mt9m001->hdl.error) 778 return mt9m001->hdl.error; 779 780 v4l2_ctrl_auto_cluster(2, &mt9m001->autoexposure, 781 V4L2_EXPOSURE_MANUAL, true); 782 783 mutex_init(&mt9m001->mutex); 784 mt9m001->hdl.lock = &mt9m001->mutex; 785 786 /* Second stage probe - when a capture adapter is there */ 787 mt9m001->y_skip_top = 0; 788 mt9m001->rect.left = MT9M001_COLUMN_SKIP; 789 mt9m001->rect.top = MT9M001_ROW_SKIP; 790 mt9m001->rect.width = MT9M001_MAX_WIDTH; 791 mt9m001->rect.height = MT9M001_MAX_HEIGHT; 792 793 ret = mt9m001_power_on(&client->dev); 794 if (ret) 795 goto error_hdl_free; 796 797 pm_runtime_set_active(&client->dev); 798 pm_runtime_enable(&client->dev); 799 800 ret = mt9m001_video_probe(client); 801 if (ret) 802 goto error_power_off; 803 804 mt9m001->pad.flags = MEDIA_PAD_FL_SOURCE; 805 mt9m001->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR; 806 ret = media_entity_pads_init(&mt9m001->subdev.entity, 1, &mt9m001->pad); 807 if (ret) 808 goto error_power_off; 809 810 ret = v4l2_async_register_subdev(&mt9m001->subdev); 811 if (ret) 812 goto error_entity_cleanup; 813 814 pm_runtime_idle(&client->dev); 815 816 return 0; 817 818 error_entity_cleanup: 819 media_entity_cleanup(&mt9m001->subdev.entity); 820 error_power_off: 821 pm_runtime_disable(&client->dev); 822 pm_runtime_set_suspended(&client->dev); 823 mt9m001_power_off(&client->dev); 824 825 error_hdl_free: 826 v4l2_ctrl_handler_free(&mt9m001->hdl); 827 mutex_destroy(&mt9m001->mutex); 828 829 return ret; 830 } 831 832 static int mt9m001_remove(struct i2c_client *client) 833 { 834 struct mt9m001 *mt9m001 = to_mt9m001(client); 835 836 pm_runtime_get_sync(&client->dev); 837 838 v4l2_async_unregister_subdev(&mt9m001->subdev); 839 media_entity_cleanup(&mt9m001->subdev.entity); 840 841 pm_runtime_disable(&client->dev); 842 pm_runtime_set_suspended(&client->dev); 843 pm_runtime_put_noidle(&client->dev); 844 mt9m001_power_off(&client->dev); 845 846 v4l2_ctrl_handler_free(&mt9m001->hdl); 847 mutex_destroy(&mt9m001->mutex); 848 849 return 0; 850 } 851 852 static const struct i2c_device_id mt9m001_id[] = { 853 { "mt9m001", 0 }, 854 { } 855 }; 856 MODULE_DEVICE_TABLE(i2c, mt9m001_id); 857 858 static const struct dev_pm_ops mt9m001_pm_ops = { 859 SET_RUNTIME_PM_OPS(mt9m001_power_off, mt9m001_power_on, NULL) 860 }; 861 862 static const struct of_device_id mt9m001_of_match[] = { 863 { .compatible = "onnn,mt9m001", }, 864 { /* sentinel */ }, 865 }; 866 MODULE_DEVICE_TABLE(of, mt9m001_of_match); 867 868 static struct i2c_driver mt9m001_i2c_driver = { 869 .driver = { 870 .name = "mt9m001", 871 .pm = &mt9m001_pm_ops, 872 .of_match_table = mt9m001_of_match, 873 }, 874 .probe_new = mt9m001_probe, 875 .remove = mt9m001_remove, 876 .id_table = mt9m001_id, 877 }; 878 879 module_i2c_driver(mt9m001_i2c_driver); 880 881 MODULE_DESCRIPTION("Micron MT9M001 Camera driver"); 882 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>"); 883 MODULE_LICENSE("GPL v2"); 884