tcm825x.c revision 0ed464e13e9321de9d1fff356eda58498574272e
1/* 2 * drivers/media/video/tcm825x.c 3 * 4 * TCM825X camera sensor driver. 5 * 6 * Copyright (C) 2007 Nokia Corporation. 7 * 8 * Contact: Sakari Ailus <sakari.ailus@nokia.com> 9 * 10 * Based on code from David Cohen <david.cohen@indt.org.br> 11 * 12 * This driver was based on ov9640 sensor driver from MontaVista 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License 16 * version 2 as published by the Free Software Foundation. 17 * 18 * This program is distributed in the hope that it will be useful, but 19 * WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21 * General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 26 * 02110-1301 USA 27 */ 28 29#include <linux/i2c.h> 30#include <media/v4l2-int-device.h> 31 32#include "tcm825x.h" 33 34/* 35 * The sensor has two fps modes: the lower one just gives half the fps 36 * at the same xclk than the high one. 37 */ 38#define MAX_FPS 30 39#define MIN_FPS 8 40#define MAX_HALF_FPS (MAX_FPS / 2) 41#define HIGH_FPS_MODE_LOWER_LIMIT 14 42#define DEFAULT_FPS MAX_HALF_FPS 43 44struct tcm825x_sensor { 45 const struct tcm825x_platform_data *platform_data; 46 struct v4l2_int_device *v4l2_int_device; 47 struct i2c_client *i2c_client; 48 struct v4l2_pix_format pix; 49 struct v4l2_fract timeperframe; 50}; 51 52/* list of image formats supported by TCM825X sensor */ 53const static struct v4l2_fmtdesc tcm825x_formats[] = { 54 { 55 .description = "YUYV (YUV 4:2:2), packed", 56 .pixelformat = V4L2_PIX_FMT_UYVY, 57 }, { 58 /* Note: V4L2 defines RGB565 as: 59 * 60 * Byte 0 Byte 1 61 * g2 g1 g0 r4 r3 r2 r1 r0 b4 b3 b2 b1 b0 g5 g4 g3 62 * 63 * We interpret RGB565 as: 64 * 65 * Byte 0 Byte 1 66 * g2 g1 g0 b4 b3 b2 b1 b0 r4 r3 r2 r1 r0 g5 g4 g3 67 */ 68 .description = "RGB565, le", 69 .pixelformat = V4L2_PIX_FMT_RGB565, 70 }, 71}; 72 73#define TCM825X_NUM_CAPTURE_FORMATS ARRAY_SIZE(tcm825x_formats) 74 75/* 76 * TCM825X register configuration for all combinations of pixel format and 77 * image size 78 */ 79const static struct tcm825x_reg subqcif = { 0x20, TCM825X_PICSIZ }; 80const static struct tcm825x_reg qcif = { 0x18, TCM825X_PICSIZ }; 81const static struct tcm825x_reg cif = { 0x14, TCM825X_PICSIZ }; 82const static struct tcm825x_reg qqvga = { 0x0c, TCM825X_PICSIZ }; 83const static struct tcm825x_reg qvga = { 0x04, TCM825X_PICSIZ }; 84const static struct tcm825x_reg vga = { 0x00, TCM825X_PICSIZ }; 85 86const static struct tcm825x_reg yuv422 = { 0x00, TCM825X_PICFMT }; 87const static struct tcm825x_reg rgb565 = { 0x02, TCM825X_PICFMT }; 88 89/* Our own specific controls */ 90#define V4L2_CID_ALC V4L2_CID_PRIVATE_BASE 91#define V4L2_CID_H_EDGE_EN V4L2_CID_PRIVATE_BASE + 1 92#define V4L2_CID_V_EDGE_EN V4L2_CID_PRIVATE_BASE + 2 93#define V4L2_CID_LENS V4L2_CID_PRIVATE_BASE + 3 94#define V4L2_CID_MAX_EXPOSURE_TIME V4L2_CID_PRIVATE_BASE + 4 95#define V4L2_CID_LAST_PRIV V4L2_CID_MAX_EXPOSURE_TIME 96 97/* Video controls */ 98static struct vcontrol { 99 struct v4l2_queryctrl qc; 100 u16 reg; 101 u16 start_bit; 102} video_control[] = { 103 { 104 { 105 .id = V4L2_CID_GAIN, 106 .type = V4L2_CTRL_TYPE_INTEGER, 107 .name = "Gain", 108 .minimum = 0, 109 .maximum = 63, 110 .step = 1, 111 }, 112 .reg = TCM825X_AG, 113 .start_bit = 0, 114 }, 115 { 116 { 117 .id = V4L2_CID_RED_BALANCE, 118 .type = V4L2_CTRL_TYPE_INTEGER, 119 .name = "Red Balance", 120 .minimum = 0, 121 .maximum = 255, 122 .step = 1, 123 }, 124 .reg = TCM825X_MRG, 125 .start_bit = 0, 126 }, 127 { 128 { 129 .id = V4L2_CID_BLUE_BALANCE, 130 .type = V4L2_CTRL_TYPE_INTEGER, 131 .name = "Blue Balance", 132 .minimum = 0, 133 .maximum = 255, 134 .step = 1, 135 }, 136 .reg = TCM825X_MBG, 137 .start_bit = 0, 138 }, 139 { 140 { 141 .id = V4L2_CID_AUTO_WHITE_BALANCE, 142 .type = V4L2_CTRL_TYPE_BOOLEAN, 143 .name = "Auto White Balance", 144 .minimum = 0, 145 .maximum = 1, 146 .step = 0, 147 }, 148 .reg = TCM825X_AWBSW, 149 .start_bit = 7, 150 }, 151 { 152 { 153 .id = V4L2_CID_EXPOSURE, 154 .type = V4L2_CTRL_TYPE_INTEGER, 155 .name = "Exposure Time", 156 .minimum = 0, 157 .maximum = 0x1fff, 158 .step = 1, 159 }, 160 .reg = TCM825X_ESRSPD_U, 161 .start_bit = 0, 162 }, 163 { 164 { 165 .id = V4L2_CID_HFLIP, 166 .type = V4L2_CTRL_TYPE_BOOLEAN, 167 .name = "Mirror Image", 168 .minimum = 0, 169 .maximum = 1, 170 .step = 0, 171 }, 172 .reg = TCM825X_H_INV, 173 .start_bit = 6, 174 }, 175 { 176 { 177 .id = V4L2_CID_VFLIP, 178 .type = V4L2_CTRL_TYPE_BOOLEAN, 179 .name = "Vertical Flip", 180 .minimum = 0, 181 .maximum = 1, 182 .step = 0, 183 }, 184 .reg = TCM825X_V_INV, 185 .start_bit = 7, 186 }, 187 /* Private controls */ 188 { 189 { 190 .id = V4L2_CID_ALC, 191 .type = V4L2_CTRL_TYPE_BOOLEAN, 192 .name = "Auto Luminance Control", 193 .minimum = 0, 194 .maximum = 1, 195 .step = 0, 196 }, 197 .reg = TCM825X_ALCSW, 198 .start_bit = 7, 199 }, 200 { 201 { 202 .id = V4L2_CID_H_EDGE_EN, 203 .type = V4L2_CTRL_TYPE_INTEGER, 204 .name = "Horizontal Edge Enhancement", 205 .minimum = 0, 206 .maximum = 0xff, 207 .step = 1, 208 }, 209 .reg = TCM825X_HDTG, 210 .start_bit = 0, 211 }, 212 { 213 { 214 .id = V4L2_CID_V_EDGE_EN, 215 .type = V4L2_CTRL_TYPE_INTEGER, 216 .name = "Vertical Edge Enhancement", 217 .minimum = 0, 218 .maximum = 0xff, 219 .step = 1, 220 }, 221 .reg = TCM825X_VDTG, 222 .start_bit = 0, 223 }, 224 { 225 { 226 .id = V4L2_CID_LENS, 227 .type = V4L2_CTRL_TYPE_INTEGER, 228 .name = "Lens Shading Compensation", 229 .minimum = 0, 230 .maximum = 0x3f, 231 .step = 1, 232 }, 233 .reg = TCM825X_LENS, 234 .start_bit = 0, 235 }, 236 { 237 { 238 .id = V4L2_CID_MAX_EXPOSURE_TIME, 239 .type = V4L2_CTRL_TYPE_INTEGER, 240 .name = "Maximum Exposure Time", 241 .minimum = 0, 242 .maximum = 0x3, 243 .step = 1, 244 }, 245 .reg = TCM825X_ESRLIM, 246 .start_bit = 5, 247 }, 248}; 249 250 251const static struct tcm825x_reg *tcm825x_siz_reg[NUM_IMAGE_SIZES] = 252{ &subqcif, &qqvga, &qcif, &qvga, &cif, &vga }; 253 254const static struct tcm825x_reg *tcm825x_fmt_reg[NUM_PIXEL_FORMATS] = 255{ &yuv422, &rgb565 }; 256 257/* 258 * Read a value from a register in an TCM825X sensor device. The value is 259 * returned in 'val'. 260 * Returns zero if successful, or non-zero otherwise. 261 */ 262static int tcm825x_read_reg(struct i2c_client *client, int reg) 263{ 264 int err; 265 struct i2c_msg msg[2]; 266 u8 reg_buf, data_buf = 0; 267 268 if (!client->adapter) 269 return -ENODEV; 270 271 msg[0].addr = client->addr; 272 msg[0].flags = 0; 273 msg[0].len = 1; 274 msg[0].buf = ®_buf; 275 msg[1].addr = client->addr; 276 msg[1].flags = I2C_M_RD; 277 msg[1].len = 1; 278 msg[1].buf = &data_buf; 279 280 reg_buf = reg; 281 282 err = i2c_transfer(client->adapter, msg, 2); 283 if (err < 0) 284 return err; 285 return data_buf; 286} 287 288/* 289 * Write a value to a register in an TCM825X sensor device. 290 * Returns zero if successful, or non-zero otherwise. 291 */ 292static int tcm825x_write_reg(struct i2c_client *client, u8 reg, u8 val) 293{ 294 int err; 295 struct i2c_msg msg[1]; 296 unsigned char data[2]; 297 298 if (!client->adapter) 299 return -ENODEV; 300 301 msg->addr = client->addr; 302 msg->flags = 0; 303 msg->len = 2; 304 msg->buf = data; 305 data[0] = reg; 306 data[1] = val; 307 err = i2c_transfer(client->adapter, msg, 1); 308 if (err >= 0) 309 return 0; 310 return err; 311} 312 313static int __tcm825x_write_reg_mask(struct i2c_client *client, 314 u8 reg, u8 val, u8 mask) 315{ 316 int rc; 317 318 /* need to do read - modify - write */ 319 rc = tcm825x_read_reg(client, reg); 320 if (rc < 0) 321 return rc; 322 323 rc &= (~mask); /* Clear the masked bits */ 324 val &= mask; /* Enforce mask on value */ 325 val |= rc; 326 327 /* write the new value to the register */ 328 rc = tcm825x_write_reg(client, reg, val); 329 if (rc) 330 return rc; 331 332 return 0; 333} 334 335#define tcm825x_write_reg_mask(client, regmask, val) \ 336 __tcm825x_write_reg_mask(client, TCM825X_ADDR((regmask)), val, \ 337 TCM825X_MASK((regmask))) 338 339 340/* 341 * Initialize a list of TCM825X registers. 342 * The list of registers is terminated by the pair of values 343 * { TCM825X_REG_TERM, TCM825X_VAL_TERM }. 344 * Returns zero if successful, or non-zero otherwise. 345 */ 346static int tcm825x_write_default_regs(struct i2c_client *client, 347 const struct tcm825x_reg *reglist) 348{ 349 int err; 350 const struct tcm825x_reg *next = reglist; 351 352 while (!((next->reg == TCM825X_REG_TERM) 353 && (next->val == TCM825X_VAL_TERM))) { 354 err = tcm825x_write_reg(client, next->reg, next->val); 355 if (err) { 356 dev_err(&client->dev, "register writing failed\n"); 357 return err; 358 } 359 next++; 360 } 361 362 return 0; 363} 364 365static struct vcontrol *find_vctrl(int id) 366{ 367 int i; 368 369 if (id < V4L2_CID_BASE) 370 return NULL; 371 372 for (i = 0; i < ARRAY_SIZE(video_control); i++) 373 if (video_control[i].qc.id == id) 374 return &video_control[i]; 375 376 return NULL; 377} 378 379/* 380 * Find the best match for a requested image capture size. The best match 381 * is chosen as the nearest match that has the same number or fewer pixels 382 * as the requested size, or the smallest image size if the requested size 383 * has fewer pixels than the smallest image. 384 */ 385static enum image_size tcm825x_find_size(struct v4l2_int_device *s, 386 unsigned int width, 387 unsigned int height) 388{ 389 enum image_size isize; 390 unsigned long pixels = width * height; 391 struct tcm825x_sensor *sensor = s->priv; 392 393 for (isize = subQCIF; isize < VGA; isize++) { 394 if (tcm825x_sizes[isize + 1].height 395 * tcm825x_sizes[isize + 1].width > pixels) { 396 dev_dbg(&sensor->i2c_client->dev, "size %d\n", isize); 397 398 return isize; 399 } 400 } 401 402 dev_dbg(&sensor->i2c_client->dev, "format default VGA\n"); 403 404 return VGA; 405} 406 407/* 408 * Configure the TCM825X for current image size, pixel format, and 409 * frame period. fper is the frame period (in seconds) expressed as a 410 * fraction. Returns zero if successful, or non-zero otherwise. The 411 * actual frame period is returned in fper. 412 */ 413static int tcm825x_configure(struct v4l2_int_device *s) 414{ 415 struct tcm825x_sensor *sensor = s->priv; 416 struct v4l2_pix_format *pix = &sensor->pix; 417 enum image_size isize = tcm825x_find_size(s, pix->width, pix->height); 418 struct v4l2_fract *fper = &sensor->timeperframe; 419 enum pixel_format pfmt; 420 int err; 421 u32 tgt_fps; 422 u8 val; 423 424 /* common register initialization */ 425 err = tcm825x_write_default_regs( 426 sensor->i2c_client, sensor->platform_data->default_regs()); 427 if (err) 428 return err; 429 430 /* configure image size */ 431 val = tcm825x_siz_reg[isize]->val; 432 dev_dbg(&sensor->i2c_client->dev, 433 "configuring image size %d\n", isize); 434 err = tcm825x_write_reg_mask(sensor->i2c_client, 435 tcm825x_siz_reg[isize]->reg, val); 436 if (err) 437 return err; 438 439 /* configure pixel format */ 440 switch (pix->pixelformat) { 441 default: 442 case V4L2_PIX_FMT_RGB565: 443 pfmt = RGB565; 444 break; 445 case V4L2_PIX_FMT_UYVY: 446 pfmt = YUV422; 447 break; 448 } 449 450 dev_dbg(&sensor->i2c_client->dev, 451 "configuring pixel format %d\n", pfmt); 452 val = tcm825x_fmt_reg[pfmt]->val; 453 454 err = tcm825x_write_reg_mask(sensor->i2c_client, 455 tcm825x_fmt_reg[pfmt]->reg, val); 456 if (err) 457 return err; 458 459 /* 460 * For frame rate < 15, the FPS reg (addr 0x02, bit 7) must be 461 * set. Frame rate will be halved from the normal. 462 */ 463 tgt_fps = fper->denominator / fper->numerator; 464 if (tgt_fps <= HIGH_FPS_MODE_LOWER_LIMIT) { 465 val = tcm825x_read_reg(sensor->i2c_client, 0x02); 466 val |= 0x80; 467 tcm825x_write_reg(sensor->i2c_client, 0x02, val); 468 } 469 470 return 0; 471} 472 473static int ioctl_queryctrl(struct v4l2_int_device *s, 474 struct v4l2_queryctrl *qc) 475{ 476 struct vcontrol *control; 477 478 control = find_vctrl(qc->id); 479 480 if (control == NULL) 481 return -EINVAL; 482 483 *qc = control->qc; 484 485 return 0; 486} 487 488static int ioctl_g_ctrl(struct v4l2_int_device *s, 489 struct v4l2_control *vc) 490{ 491 struct tcm825x_sensor *sensor = s->priv; 492 struct i2c_client *client = sensor->i2c_client; 493 int val, r; 494 struct vcontrol *lvc; 495 496 /* exposure time is special, spread accross 2 registers */ 497 if (vc->id == V4L2_CID_EXPOSURE) { 498 int val_lower, val_upper; 499 500 val_upper = tcm825x_read_reg(client, 501 TCM825X_ADDR(TCM825X_ESRSPD_U)); 502 if (val_upper < 0) 503 return val_upper; 504 val_lower = tcm825x_read_reg(client, 505 TCM825X_ADDR(TCM825X_ESRSPD_L)); 506 if (val_lower < 0) 507 return val_lower; 508 509 vc->value = ((val_upper & 0x1f) << 8) | (val_lower); 510 return 0; 511 } 512 513 lvc = find_vctrl(vc->id); 514 if (lvc == NULL) 515 return -EINVAL; 516 517 r = tcm825x_read_reg(client, TCM825X_ADDR(lvc->reg)); 518 if (r < 0) 519 return r; 520 val = r & TCM825X_MASK(lvc->reg); 521 val >>= lvc->start_bit; 522 523 if (val < 0) 524 return val; 525 526 vc->value = val; 527 return 0; 528} 529 530static int ioctl_s_ctrl(struct v4l2_int_device *s, 531 struct v4l2_control *vc) 532{ 533 struct tcm825x_sensor *sensor = s->priv; 534 struct i2c_client *client = sensor->i2c_client; 535 struct vcontrol *lvc; 536 int val = vc->value; 537 538 /* exposure time is special, spread accross 2 registers */ 539 if (vc->id == V4L2_CID_EXPOSURE) { 540 int val_lower, val_upper; 541 val_lower = val & TCM825X_MASK(TCM825X_ESRSPD_L); 542 val_upper = (val >> 8) & TCM825X_MASK(TCM825X_ESRSPD_U); 543 544 if (tcm825x_write_reg_mask(client, 545 TCM825X_ESRSPD_U, val_upper)) 546 return -EIO; 547 548 if (tcm825x_write_reg_mask(client, 549 TCM825X_ESRSPD_L, val_lower)) 550 return -EIO; 551 552 return 0; 553 } 554 555 lvc = find_vctrl(vc->id); 556 if (lvc == NULL) 557 return -EINVAL; 558 559 val = val << lvc->start_bit; 560 if (tcm825x_write_reg_mask(client, lvc->reg, val)) 561 return -EIO; 562 563 return 0; 564} 565 566static int ioctl_enum_fmt_cap(struct v4l2_int_device *s, 567 struct v4l2_fmtdesc *fmt) 568{ 569 int index = fmt->index; 570 571 switch (fmt->type) { 572 case V4L2_BUF_TYPE_VIDEO_CAPTURE: 573 if (index >= TCM825X_NUM_CAPTURE_FORMATS) 574 return -EINVAL; 575 break; 576 577 default: 578 return -EINVAL; 579 } 580 581 fmt->flags = tcm825x_formats[index].flags; 582 strlcpy(fmt->description, tcm825x_formats[index].description, 583 sizeof(fmt->description)); 584 fmt->pixelformat = tcm825x_formats[index].pixelformat; 585 586 return 0; 587} 588 589static int ioctl_try_fmt_cap(struct v4l2_int_device *s, 590 struct v4l2_format *f) 591{ 592 struct tcm825x_sensor *sensor = s->priv; 593 enum image_size isize; 594 int ifmt; 595 struct v4l2_pix_format *pix = &f->fmt.pix; 596 597 isize = tcm825x_find_size(s, pix->width, pix->height); 598 dev_dbg(&sensor->i2c_client->dev, "isize = %d num_capture = %lu\n", 599 isize, (unsigned long)TCM825X_NUM_CAPTURE_FORMATS); 600 601 pix->width = tcm825x_sizes[isize].width; 602 pix->height = tcm825x_sizes[isize].height; 603 604 for (ifmt = 0; ifmt < TCM825X_NUM_CAPTURE_FORMATS; ifmt++) 605 if (pix->pixelformat == tcm825x_formats[ifmt].pixelformat) 606 break; 607 608 if (ifmt == TCM825X_NUM_CAPTURE_FORMATS) 609 ifmt = 0; /* Default = YUV 4:2:2 */ 610 611 pix->pixelformat = tcm825x_formats[ifmt].pixelformat; 612 pix->field = V4L2_FIELD_NONE; 613 pix->bytesperline = pix->width * TCM825X_BYTES_PER_PIXEL; 614 pix->sizeimage = pix->bytesperline * pix->height; 615 pix->priv = 0; 616 dev_dbg(&sensor->i2c_client->dev, "format = 0x%08x\n", 617 pix->pixelformat); 618 619 switch (pix->pixelformat) { 620 case V4L2_PIX_FMT_UYVY: 621 default: 622 pix->colorspace = V4L2_COLORSPACE_JPEG; 623 break; 624 case V4L2_PIX_FMT_RGB565: 625 pix->colorspace = V4L2_COLORSPACE_SRGB; 626 break; 627 } 628 629 return 0; 630} 631 632static int ioctl_s_fmt_cap(struct v4l2_int_device *s, 633 struct v4l2_format *f) 634{ 635 struct tcm825x_sensor *sensor = s->priv; 636 struct v4l2_pix_format *pix = &f->fmt.pix; 637 int rval; 638 639 rval = ioctl_try_fmt_cap(s, f); 640 if (rval) 641 return rval; 642 643 rval = tcm825x_configure(s); 644 645 sensor->pix = *pix; 646 647 return rval; 648} 649 650static int ioctl_g_fmt_cap(struct v4l2_int_device *s, 651 struct v4l2_format *f) 652{ 653 struct tcm825x_sensor *sensor = s->priv; 654 655 f->fmt.pix = sensor->pix; 656 657 return 0; 658} 659 660static int ioctl_g_parm(struct v4l2_int_device *s, 661 struct v4l2_streamparm *a) 662{ 663 struct tcm825x_sensor *sensor = s->priv; 664 struct v4l2_captureparm *cparm = &a->parm.capture; 665 666 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 667 return -EINVAL; 668 669 memset(a, 0, sizeof(*a)); 670 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 671 672 cparm->capability = V4L2_CAP_TIMEPERFRAME; 673 cparm->timeperframe = sensor->timeperframe; 674 675 return 0; 676} 677 678static int ioctl_s_parm(struct v4l2_int_device *s, 679 struct v4l2_streamparm *a) 680{ 681 struct tcm825x_sensor *sensor = s->priv; 682 struct v4l2_fract *timeperframe = &a->parm.capture.timeperframe; 683 u32 tgt_fps; /* target frames per secound */ 684 int rval; 685 686 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 687 return -EINVAL; 688 689 if ((timeperframe->numerator == 0) 690 || (timeperframe->denominator == 0)) { 691 timeperframe->denominator = DEFAULT_FPS; 692 timeperframe->numerator = 1; 693 } 694 695 tgt_fps = timeperframe->denominator / timeperframe->numerator; 696 697 if (tgt_fps > MAX_FPS) { 698 timeperframe->denominator = MAX_FPS; 699 timeperframe->numerator = 1; 700 } else if (tgt_fps < MIN_FPS) { 701 timeperframe->denominator = MIN_FPS; 702 timeperframe->numerator = 1; 703 } 704 705 sensor->timeperframe = *timeperframe; 706 707 rval = tcm825x_configure(s); 708 709 return rval; 710} 711 712static int ioctl_s_power(struct v4l2_int_device *s, int on) 713{ 714 struct tcm825x_sensor *sensor = s->priv; 715 716 return sensor->platform_data->power_set(on); 717} 718 719/* 720 * Given the image capture format in pix, the nominal frame period in 721 * timeperframe, calculate the required xclk frequency. 722 * 723 * TCM825X input frequency characteristics are: 724 * Minimum 11.9 MHz, Typical 24.57 MHz and maximum 25/27 MHz 725 */ 726 727static int ioctl_g_ifparm(struct v4l2_int_device *s, struct v4l2_ifparm *p) 728{ 729 struct tcm825x_sensor *sensor = s->priv; 730 struct v4l2_fract *timeperframe = &sensor->timeperframe; 731 u32 tgt_xclk; /* target xclk */ 732 u32 tgt_fps; /* target frames per secound */ 733 int rval; 734 735 rval = sensor->platform_data->ifparm(p); 736 if (rval) 737 return rval; 738 739 tgt_fps = timeperframe->denominator / timeperframe->numerator; 740 741 tgt_xclk = (tgt_fps <= HIGH_FPS_MODE_LOWER_LIMIT) ? 742 (2457 * tgt_fps) / MAX_HALF_FPS : 743 (2457 * tgt_fps) / MAX_FPS; 744 tgt_xclk *= 10000; 745 746 tgt_xclk = min(tgt_xclk, (u32)TCM825X_XCLK_MAX); 747 tgt_xclk = max(tgt_xclk, (u32)TCM825X_XCLK_MIN); 748 749 p->u.bt656.clock_curr = tgt_xclk; 750 751 return 0; 752} 753 754static int ioctl_g_needs_reset(struct v4l2_int_device *s, void *buf) 755{ 756 struct tcm825x_sensor *sensor = s->priv; 757 758 return sensor->platform_data->needs_reset(s, buf, &sensor->pix); 759} 760 761static int ioctl_reset(struct v4l2_int_device *s) 762{ 763 return -EBUSY; 764} 765 766static int ioctl_init(struct v4l2_int_device *s) 767{ 768 return tcm825x_configure(s); 769} 770 771static int ioctl_dev_exit(struct v4l2_int_device *s) 772{ 773 return 0; 774} 775 776static int ioctl_dev_init(struct v4l2_int_device *s) 777{ 778 struct tcm825x_sensor *sensor = s->priv; 779 int r; 780 781 r = tcm825x_read_reg(sensor->i2c_client, 0x01); 782 if (r < 0) 783 return r; 784 if (r == 0) { 785 dev_err(&sensor->i2c_client->dev, "device not detected\n"); 786 return -EIO; 787 } 788 return 0; 789} 790 791static struct v4l2_int_ioctl_desc tcm825x_ioctl_desc[] = { 792 { vidioc_int_dev_init_num, 793 (v4l2_int_ioctl_func *)ioctl_dev_init }, 794 { vidioc_int_dev_exit_num, 795 (v4l2_int_ioctl_func *)ioctl_dev_exit }, 796 { vidioc_int_s_power_num, 797 (v4l2_int_ioctl_func *)ioctl_s_power }, 798 { vidioc_int_g_ifparm_num, 799 (v4l2_int_ioctl_func *)ioctl_g_ifparm }, 800 { vidioc_int_g_needs_reset_num, 801 (v4l2_int_ioctl_func *)ioctl_g_needs_reset }, 802 { vidioc_int_reset_num, 803 (v4l2_int_ioctl_func *)ioctl_reset }, 804 { vidioc_int_init_num, 805 (v4l2_int_ioctl_func *)ioctl_init }, 806 { vidioc_int_enum_fmt_cap_num, 807 (v4l2_int_ioctl_func *)ioctl_enum_fmt_cap }, 808 { vidioc_int_try_fmt_cap_num, 809 (v4l2_int_ioctl_func *)ioctl_try_fmt_cap }, 810 { vidioc_int_g_fmt_cap_num, 811 (v4l2_int_ioctl_func *)ioctl_g_fmt_cap }, 812 { vidioc_int_s_fmt_cap_num, 813 (v4l2_int_ioctl_func *)ioctl_s_fmt_cap }, 814 { vidioc_int_g_parm_num, 815 (v4l2_int_ioctl_func *)ioctl_g_parm }, 816 { vidioc_int_s_parm_num, 817 (v4l2_int_ioctl_func *)ioctl_s_parm }, 818 { vidioc_int_queryctrl_num, 819 (v4l2_int_ioctl_func *)ioctl_queryctrl }, 820 { vidioc_int_g_ctrl_num, 821 (v4l2_int_ioctl_func *)ioctl_g_ctrl }, 822 { vidioc_int_s_ctrl_num, 823 (v4l2_int_ioctl_func *)ioctl_s_ctrl }, 824}; 825 826static struct v4l2_int_slave tcm825x_slave = { 827 .ioctls = tcm825x_ioctl_desc, 828 .num_ioctls = ARRAY_SIZE(tcm825x_ioctl_desc), 829}; 830 831static struct tcm825x_sensor tcm825x; 832 833static struct v4l2_int_device tcm825x_int_device = { 834 .module = THIS_MODULE, 835 .name = TCM825X_NAME, 836 .priv = &tcm825x, 837 .type = v4l2_int_type_slave, 838 .u = { 839 .slave = &tcm825x_slave, 840 }, 841}; 842 843static int tcm825x_probe(struct i2c_client *client) 844{ 845 struct tcm825x_sensor *sensor = &tcm825x; 846 int rval; 847 848 if (i2c_get_clientdata(client)) 849 return -EBUSY; 850 851 sensor->platform_data = client->dev.platform_data; 852 853 if (sensor->platform_data == NULL 854 || !sensor->platform_data->is_okay()) 855 return -ENODEV; 856 857 sensor->v4l2_int_device = &tcm825x_int_device; 858 859 sensor->i2c_client = client; 860 i2c_set_clientdata(client, sensor); 861 862 /* Make the default capture format QVGA RGB565 */ 863 sensor->pix.width = tcm825x_sizes[QVGA].width; 864 sensor->pix.height = tcm825x_sizes[QVGA].height; 865 sensor->pix.pixelformat = V4L2_PIX_FMT_RGB565; 866 867 rval = v4l2_int_device_register(sensor->v4l2_int_device); 868 if (rval) 869 i2c_set_clientdata(client, NULL); 870 871 return rval; 872} 873 874static int __exit tcm825x_remove(struct i2c_client *client) 875{ 876 struct tcm825x_sensor *sensor = i2c_get_clientdata(client); 877 878 if (!client->adapter) 879 return -ENODEV; /* our client isn't attached */ 880 881 v4l2_int_device_unregister(sensor->v4l2_int_device); 882 i2c_set_clientdata(client, NULL); 883 884 return 0; 885} 886 887static struct i2c_driver tcm825x_i2c_driver = { 888 .driver = { 889 .name = TCM825X_NAME, 890 }, 891 .probe = tcm825x_probe, 892 .remove = __exit_p(tcm825x_remove), 893}; 894 895static struct tcm825x_sensor tcm825x = { 896 .timeperframe = { 897 .numerator = 1, 898 .denominator = DEFAULT_FPS, 899 }, 900}; 901 902static int __init tcm825x_init(void) 903{ 904 int rval; 905 906 rval = i2c_add_driver(&tcm825x_i2c_driver); 907 if (rval) 908 printk(KERN_INFO "%s: failed registering " TCM825X_NAME "\n", 909 __FUNCTION__); 910 911 return rval; 912} 913 914static void __exit tcm825x_exit(void) 915{ 916 i2c_del_driver(&tcm825x_i2c_driver); 917} 918 919/* 920 * FIXME: Menelaus isn't ready (?) at module_init stage, so use 921 * late_initcall for now. 922 */ 923late_initcall(tcm825x_init); 924module_exit(tcm825x_exit); 925 926MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>"); 927MODULE_DESCRIPTION("TCM825x camera sensor driver"); 928MODULE_LICENSE("GPL"); 929