1/* 2 * mt9v011 -Micron 1/4-Inch VGA Digital Image Sensor 3 * 4 * Copyright (c) 2009 Mauro Carvalho Chehab 5 * This code is placed under the terms of the GNU General Public License v2 6 */ 7 8#include <linux/i2c.h> 9#include <linux/slab.h> 10#include <linux/videodev2.h> 11#include <linux/delay.h> 12#include <linux/module.h> 13#include <asm/div64.h> 14#include <media/v4l2-device.h> 15#include <media/v4l2-ctrls.h> 16#include <media/mt9v011.h> 17 18MODULE_DESCRIPTION("Micron mt9v011 sensor driver"); 19MODULE_AUTHOR("Mauro Carvalho Chehab"); 20MODULE_LICENSE("GPL"); 21 22static int debug; 23module_param(debug, int, 0); 24MODULE_PARM_DESC(debug, "Debug level (0-2)"); 25 26#define R00_MT9V011_CHIP_VERSION 0x00 27#define R01_MT9V011_ROWSTART 0x01 28#define R02_MT9V011_COLSTART 0x02 29#define R03_MT9V011_HEIGHT 0x03 30#define R04_MT9V011_WIDTH 0x04 31#define R05_MT9V011_HBLANK 0x05 32#define R06_MT9V011_VBLANK 0x06 33#define R07_MT9V011_OUT_CTRL 0x07 34#define R09_MT9V011_SHUTTER_WIDTH 0x09 35#define R0A_MT9V011_CLK_SPEED 0x0a 36#define R0B_MT9V011_RESTART 0x0b 37#define R0C_MT9V011_SHUTTER_DELAY 0x0c 38#define R0D_MT9V011_RESET 0x0d 39#define R1E_MT9V011_DIGITAL_ZOOM 0x1e 40#define R20_MT9V011_READ_MODE 0x20 41#define R2B_MT9V011_GREEN_1_GAIN 0x2b 42#define R2C_MT9V011_BLUE_GAIN 0x2c 43#define R2D_MT9V011_RED_GAIN 0x2d 44#define R2E_MT9V011_GREEN_2_GAIN 0x2e 45#define R35_MT9V011_GLOBAL_GAIN 0x35 46#define RF1_MT9V011_CHIP_ENABLE 0xf1 47 48#define MT9V011_VERSION 0x8232 49#define MT9V011_REV_B_VERSION 0x8243 50 51struct mt9v011 { 52 struct v4l2_subdev sd; 53 struct v4l2_ctrl_handler ctrls; 54 unsigned width, height; 55 unsigned xtal; 56 unsigned hflip:1; 57 unsigned vflip:1; 58 59 u16 global_gain, exposure; 60 s16 red_bal, blue_bal; 61}; 62 63static inline struct mt9v011 *to_mt9v011(struct v4l2_subdev *sd) 64{ 65 return container_of(sd, struct mt9v011, sd); 66} 67 68static int mt9v011_read(struct v4l2_subdev *sd, unsigned char addr) 69{ 70 struct i2c_client *c = v4l2_get_subdevdata(sd); 71 __be16 buffer; 72 int rc, val; 73 74 rc = i2c_master_send(c, &addr, 1); 75 if (rc != 1) 76 v4l2_dbg(0, debug, sd, 77 "i2c i/o error: rc == %d (should be 1)\n", rc); 78 79 msleep(10); 80 81 rc = i2c_master_recv(c, (char *)&buffer, 2); 82 if (rc != 2) 83 v4l2_dbg(0, debug, sd, 84 "i2c i/o error: rc == %d (should be 2)\n", rc); 85 86 val = be16_to_cpu(buffer); 87 88 v4l2_dbg(2, debug, sd, "mt9v011: read 0x%02x = 0x%04x\n", addr, val); 89 90 return val; 91} 92 93static void mt9v011_write(struct v4l2_subdev *sd, unsigned char addr, 94 u16 value) 95{ 96 struct i2c_client *c = v4l2_get_subdevdata(sd); 97 unsigned char buffer[3]; 98 int rc; 99 100 buffer[0] = addr; 101 buffer[1] = value >> 8; 102 buffer[2] = value & 0xff; 103 104 v4l2_dbg(2, debug, sd, 105 "mt9v011: writing 0x%02x 0x%04x\n", buffer[0], value); 106 rc = i2c_master_send(c, buffer, 3); 107 if (rc != 3) 108 v4l2_dbg(0, debug, sd, 109 "i2c i/o error: rc == %d (should be 3)\n", rc); 110} 111 112 113struct i2c_reg_value { 114 unsigned char reg; 115 u16 value; 116}; 117 118/* 119 * Values used at the original driver 120 * Some values are marked as Reserved at the datasheet 121 */ 122static const struct i2c_reg_value mt9v011_init_default[] = { 123 { R0D_MT9V011_RESET, 0x0001 }, 124 { R0D_MT9V011_RESET, 0x0000 }, 125 126 { R0C_MT9V011_SHUTTER_DELAY, 0x0000 }, 127 { R09_MT9V011_SHUTTER_WIDTH, 0x1fc }, 128 129 { R0A_MT9V011_CLK_SPEED, 0x0000 }, 130 { R1E_MT9V011_DIGITAL_ZOOM, 0x0000 }, 131 132 { R07_MT9V011_OUT_CTRL, 0x0002 }, /* chip enable */ 133}; 134 135 136static u16 calc_mt9v011_gain(s16 lineargain) 137{ 138 139 u16 digitalgain = 0; 140 u16 analogmult = 0; 141 u16 analoginit = 0; 142 143 if (lineargain < 0) 144 lineargain = 0; 145 146 /* recommended minimum */ 147 lineargain += 0x0020; 148 149 if (lineargain > 2047) 150 lineargain = 2047; 151 152 if (lineargain > 1023) { 153 digitalgain = 3; 154 analogmult = 3; 155 analoginit = lineargain / 16; 156 } else if (lineargain > 511) { 157 digitalgain = 1; 158 analogmult = 3; 159 analoginit = lineargain / 8; 160 } else if (lineargain > 255) { 161 analogmult = 3; 162 analoginit = lineargain / 4; 163 } else if (lineargain > 127) { 164 analogmult = 1; 165 analoginit = lineargain / 2; 166 } else 167 analoginit = lineargain; 168 169 return analoginit + (analogmult << 7) + (digitalgain << 9); 170 171} 172 173static void set_balance(struct v4l2_subdev *sd) 174{ 175 struct mt9v011 *core = to_mt9v011(sd); 176 u16 green_gain, blue_gain, red_gain; 177 u16 exposure; 178 s16 bal; 179 180 exposure = core->exposure; 181 182 green_gain = calc_mt9v011_gain(core->global_gain); 183 184 bal = core->global_gain; 185 bal += (core->blue_bal * core->global_gain / (1 << 7)); 186 blue_gain = calc_mt9v011_gain(bal); 187 188 bal = core->global_gain; 189 bal += (core->red_bal * core->global_gain / (1 << 7)); 190 red_gain = calc_mt9v011_gain(bal); 191 192 mt9v011_write(sd, R2B_MT9V011_GREEN_1_GAIN, green_gain); 193 mt9v011_write(sd, R2E_MT9V011_GREEN_2_GAIN, green_gain); 194 mt9v011_write(sd, R2C_MT9V011_BLUE_GAIN, blue_gain); 195 mt9v011_write(sd, R2D_MT9V011_RED_GAIN, red_gain); 196 mt9v011_write(sd, R09_MT9V011_SHUTTER_WIDTH, exposure); 197} 198 199static void calc_fps(struct v4l2_subdev *sd, u32 *numerator, u32 *denominator) 200{ 201 struct mt9v011 *core = to_mt9v011(sd); 202 unsigned height, width, hblank, vblank, speed; 203 unsigned row_time, t_time; 204 u64 frames_per_ms; 205 unsigned tmp; 206 207 height = mt9v011_read(sd, R03_MT9V011_HEIGHT); 208 width = mt9v011_read(sd, R04_MT9V011_WIDTH); 209 hblank = mt9v011_read(sd, R05_MT9V011_HBLANK); 210 vblank = mt9v011_read(sd, R06_MT9V011_VBLANK); 211 speed = mt9v011_read(sd, R0A_MT9V011_CLK_SPEED); 212 213 row_time = (width + 113 + hblank) * (speed + 2); 214 t_time = row_time * (height + vblank + 1); 215 216 frames_per_ms = core->xtal * 1000l; 217 do_div(frames_per_ms, t_time); 218 tmp = frames_per_ms; 219 220 v4l2_dbg(1, debug, sd, "Programmed to %u.%03u fps (%d pixel clcks)\n", 221 tmp / 1000, tmp % 1000, t_time); 222 223 if (numerator && denominator) { 224 *numerator = 1000; 225 *denominator = (u32)frames_per_ms; 226 } 227} 228 229static u16 calc_speed(struct v4l2_subdev *sd, u32 numerator, u32 denominator) 230{ 231 struct mt9v011 *core = to_mt9v011(sd); 232 unsigned height, width, hblank, vblank; 233 unsigned row_time, line_time; 234 u64 t_time, speed; 235 236 /* Avoid bogus calculus */ 237 if (!numerator || !denominator) 238 return 0; 239 240 height = mt9v011_read(sd, R03_MT9V011_HEIGHT); 241 width = mt9v011_read(sd, R04_MT9V011_WIDTH); 242 hblank = mt9v011_read(sd, R05_MT9V011_HBLANK); 243 vblank = mt9v011_read(sd, R06_MT9V011_VBLANK); 244 245 row_time = width + 113 + hblank; 246 line_time = height + vblank + 1; 247 248 t_time = core->xtal * ((u64)numerator); 249 /* round to the closest value */ 250 t_time += denominator / 2; 251 do_div(t_time, denominator); 252 253 speed = t_time; 254 do_div(speed, row_time * line_time); 255 256 /* Avoid having a negative value for speed */ 257 if (speed < 2) 258 speed = 0; 259 else 260 speed -= 2; 261 262 /* Avoid speed overflow */ 263 if (speed > 15) 264 return 15; 265 266 return (u16)speed; 267} 268 269static void set_res(struct v4l2_subdev *sd) 270{ 271 struct mt9v011 *core = to_mt9v011(sd); 272 unsigned vstart, hstart; 273 274 /* 275 * The mt9v011 doesn't have scaling. So, in order to select the desired 276 * resolution, we're cropping at the middle of the sensor. 277 * hblank and vblank should be adjusted, in order to warrant that 278 * we'll preserve the line timings for 30 fps, no matter what resolution 279 * is selected. 280 * NOTE: datasheet says that width (and height) should be filled with 281 * width-1. However, this doesn't work, since one pixel per line will 282 * be missing. 283 */ 284 285 hstart = 20 + (640 - core->width) / 2; 286 mt9v011_write(sd, R02_MT9V011_COLSTART, hstart); 287 mt9v011_write(sd, R04_MT9V011_WIDTH, core->width); 288 mt9v011_write(sd, R05_MT9V011_HBLANK, 771 - core->width); 289 290 vstart = 8 + (480 - core->height) / 2; 291 mt9v011_write(sd, R01_MT9V011_ROWSTART, vstart); 292 mt9v011_write(sd, R03_MT9V011_HEIGHT, core->height); 293 mt9v011_write(sd, R06_MT9V011_VBLANK, 508 - core->height); 294 295 calc_fps(sd, NULL, NULL); 296}; 297 298static void set_read_mode(struct v4l2_subdev *sd) 299{ 300 struct mt9v011 *core = to_mt9v011(sd); 301 unsigned mode = 0x1000; 302 303 if (core->hflip) 304 mode |= 0x4000; 305 306 if (core->vflip) 307 mode |= 0x8000; 308 309 mt9v011_write(sd, R20_MT9V011_READ_MODE, mode); 310} 311 312static int mt9v011_reset(struct v4l2_subdev *sd, u32 val) 313{ 314 int i; 315 316 for (i = 0; i < ARRAY_SIZE(mt9v011_init_default); i++) 317 mt9v011_write(sd, mt9v011_init_default[i].reg, 318 mt9v011_init_default[i].value); 319 320 set_balance(sd); 321 set_res(sd); 322 set_read_mode(sd); 323 324 return 0; 325} 326 327static int mt9v011_enum_mbus_fmt(struct v4l2_subdev *sd, unsigned index, 328 enum v4l2_mbus_pixelcode *code) 329{ 330 if (index > 0) 331 return -EINVAL; 332 333 *code = V4L2_MBUS_FMT_SGRBG8_1X8; 334 return 0; 335} 336 337static int mt9v011_try_mbus_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *fmt) 338{ 339 if (fmt->code != V4L2_MBUS_FMT_SGRBG8_1X8) 340 return -EINVAL; 341 342 v4l_bound_align_image(&fmt->width, 48, 639, 1, 343 &fmt->height, 32, 480, 1, 0); 344 fmt->field = V4L2_FIELD_NONE; 345 fmt->colorspace = V4L2_COLORSPACE_SRGB; 346 347 return 0; 348} 349 350static int mt9v011_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms) 351{ 352 struct v4l2_captureparm *cp = &parms->parm.capture; 353 354 if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 355 return -EINVAL; 356 357 memset(cp, 0, sizeof(struct v4l2_captureparm)); 358 cp->capability = V4L2_CAP_TIMEPERFRAME; 359 calc_fps(sd, 360 &cp->timeperframe.numerator, 361 &cp->timeperframe.denominator); 362 363 return 0; 364} 365 366static int mt9v011_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms) 367{ 368 struct v4l2_captureparm *cp = &parms->parm.capture; 369 struct v4l2_fract *tpf = &cp->timeperframe; 370 u16 speed; 371 372 if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 373 return -EINVAL; 374 if (cp->extendedmode != 0) 375 return -EINVAL; 376 377 speed = calc_speed(sd, tpf->numerator, tpf->denominator); 378 379 mt9v011_write(sd, R0A_MT9V011_CLK_SPEED, speed); 380 v4l2_dbg(1, debug, sd, "Setting speed to %d\n", speed); 381 382 /* Recalculate and update fps info */ 383 calc_fps(sd, &tpf->numerator, &tpf->denominator); 384 385 return 0; 386} 387 388static int mt9v011_s_mbus_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *fmt) 389{ 390 struct mt9v011 *core = to_mt9v011(sd); 391 int rc; 392 393 rc = mt9v011_try_mbus_fmt(sd, fmt); 394 if (rc < 0) 395 return -EINVAL; 396 397 core->width = fmt->width; 398 core->height = fmt->height; 399 400 set_res(sd); 401 402 return 0; 403} 404 405#ifdef CONFIG_VIDEO_ADV_DEBUG 406static int mt9v011_g_register(struct v4l2_subdev *sd, 407 struct v4l2_dbg_register *reg) 408{ 409 reg->val = mt9v011_read(sd, reg->reg & 0xff); 410 reg->size = 2; 411 412 return 0; 413} 414 415static int mt9v011_s_register(struct v4l2_subdev *sd, 416 const struct v4l2_dbg_register *reg) 417{ 418 mt9v011_write(sd, reg->reg & 0xff, reg->val & 0xffff); 419 420 return 0; 421} 422#endif 423 424static int mt9v011_s_ctrl(struct v4l2_ctrl *ctrl) 425{ 426 struct mt9v011 *core = 427 container_of(ctrl->handler, struct mt9v011, ctrls); 428 struct v4l2_subdev *sd = &core->sd; 429 430 switch (ctrl->id) { 431 case V4L2_CID_GAIN: 432 core->global_gain = ctrl->val; 433 break; 434 case V4L2_CID_EXPOSURE: 435 core->exposure = ctrl->val; 436 break; 437 case V4L2_CID_RED_BALANCE: 438 core->red_bal = ctrl->val; 439 break; 440 case V4L2_CID_BLUE_BALANCE: 441 core->blue_bal = ctrl->val; 442 break; 443 case V4L2_CID_HFLIP: 444 core->hflip = ctrl->val; 445 set_read_mode(sd); 446 return 0; 447 case V4L2_CID_VFLIP: 448 core->vflip = ctrl->val; 449 set_read_mode(sd); 450 return 0; 451 default: 452 return -EINVAL; 453 } 454 455 set_balance(sd); 456 return 0; 457} 458 459static struct v4l2_ctrl_ops mt9v011_ctrl_ops = { 460 .s_ctrl = mt9v011_s_ctrl, 461}; 462 463static const struct v4l2_subdev_core_ops mt9v011_core_ops = { 464 .reset = mt9v011_reset, 465#ifdef CONFIG_VIDEO_ADV_DEBUG 466 .g_register = mt9v011_g_register, 467 .s_register = mt9v011_s_register, 468#endif 469}; 470 471static const struct v4l2_subdev_video_ops mt9v011_video_ops = { 472 .enum_mbus_fmt = mt9v011_enum_mbus_fmt, 473 .try_mbus_fmt = mt9v011_try_mbus_fmt, 474 .s_mbus_fmt = mt9v011_s_mbus_fmt, 475 .g_parm = mt9v011_g_parm, 476 .s_parm = mt9v011_s_parm, 477}; 478 479static const struct v4l2_subdev_ops mt9v011_ops = { 480 .core = &mt9v011_core_ops, 481 .video = &mt9v011_video_ops, 482}; 483 484 485/**************************************************************************** 486 I2C Client & Driver 487 ****************************************************************************/ 488 489static int mt9v011_probe(struct i2c_client *c, 490 const struct i2c_device_id *id) 491{ 492 u16 version; 493 struct mt9v011 *core; 494 struct v4l2_subdev *sd; 495 496 /* Check if the adapter supports the needed features */ 497 if (!i2c_check_functionality(c->adapter, 498 I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) 499 return -EIO; 500 501 core = devm_kzalloc(&c->dev, sizeof(struct mt9v011), GFP_KERNEL); 502 if (!core) 503 return -ENOMEM; 504 505 sd = &core->sd; 506 v4l2_i2c_subdev_init(sd, c, &mt9v011_ops); 507 508 /* Check if the sensor is really a MT9V011 */ 509 version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION); 510 if ((version != MT9V011_VERSION) && 511 (version != MT9V011_REV_B_VERSION)) { 512 v4l2_info(sd, "*** unknown micron chip detected (0x%04x).\n", 513 version); 514 return -EINVAL; 515 } 516 517 v4l2_ctrl_handler_init(&core->ctrls, 5); 518 v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops, 519 V4L2_CID_GAIN, 0, (1 << 12) - 1 - 0x20, 1, 0x20); 520 v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops, 521 V4L2_CID_EXPOSURE, 0, 2047, 1, 0x01fc); 522 v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops, 523 V4L2_CID_RED_BALANCE, -(1 << 9), (1 << 9) - 1, 1, 0); 524 v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops, 525 V4L2_CID_BLUE_BALANCE, -(1 << 9), (1 << 9) - 1, 1, 0); 526 v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops, 527 V4L2_CID_HFLIP, 0, 1, 1, 0); 528 v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops, 529 V4L2_CID_VFLIP, 0, 1, 1, 0); 530 531 if (core->ctrls.error) { 532 int ret = core->ctrls.error; 533 534 v4l2_err(sd, "control initialization error %d\n", ret); 535 v4l2_ctrl_handler_free(&core->ctrls); 536 return ret; 537 } 538 core->sd.ctrl_handler = &core->ctrls; 539 540 core->global_gain = 0x0024; 541 core->exposure = 0x01fc; 542 core->width = 640; 543 core->height = 480; 544 core->xtal = 27000000; /* Hz */ 545 546 if (c->dev.platform_data) { 547 struct mt9v011_platform_data *pdata = c->dev.platform_data; 548 549 core->xtal = pdata->xtal; 550 v4l2_dbg(1, debug, sd, "xtal set to %d.%03d MHz\n", 551 core->xtal / 1000000, (core->xtal / 1000) % 1000); 552 } 553 554 v4l_info(c, "chip found @ 0x%02x (%s - chip version 0x%04x)\n", 555 c->addr << 1, c->adapter->name, version); 556 557 return 0; 558} 559 560static int mt9v011_remove(struct i2c_client *c) 561{ 562 struct v4l2_subdev *sd = i2c_get_clientdata(c); 563 struct mt9v011 *core = to_mt9v011(sd); 564 565 v4l2_dbg(1, debug, sd, 566 "mt9v011.c: removing mt9v011 adapter on address 0x%x\n", 567 c->addr << 1); 568 569 v4l2_device_unregister_subdev(sd); 570 v4l2_ctrl_handler_free(&core->ctrls); 571 572 return 0; 573} 574 575/* ----------------------------------------------------------------------- */ 576 577static const struct i2c_device_id mt9v011_id[] = { 578 { "mt9v011", 0 }, 579 { } 580}; 581MODULE_DEVICE_TABLE(i2c, mt9v011_id); 582 583static struct i2c_driver mt9v011_driver = { 584 .driver = { 585 .owner = THIS_MODULE, 586 .name = "mt9v011", 587 }, 588 .probe = mt9v011_probe, 589 .remove = mt9v011_remove, 590 .id_table = mt9v011_id, 591}; 592 593module_i2c_driver(mt9v011_driver); 594