1 /* 2 cx231xx_vbi.c - driver for Conexant Cx23100/101/102 USB video capture devices 3 4 Copyright (C) 2008 <srinivasa.deevi at conexant dot com> 5 Based on cx88 driver 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU 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., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 #include "cx231xx.h" 23 #include <linux/init.h> 24 #include <linux/list.h> 25 #include <linux/module.h> 26 #include <linux/kernel.h> 27 #include <linux/bitmap.h> 28 #include <linux/i2c.h> 29 #include <linux/mm.h> 30 #include <linux/mutex.h> 31 #include <linux/slab.h> 32 33 #include <media/v4l2-common.h> 34 #include <media/v4l2-ioctl.h> 35 #include <media/msp3400.h> 36 #include <media/tuner.h> 37 38 #include "cx231xx-vbi.h" 39 40 static inline void print_err_status(struct cx231xx *dev, int packet, int status) 41 { 42 char *errmsg = "Unknown"; 43 44 switch (status) { 45 case -ENOENT: 46 errmsg = "unlinked synchronuously"; 47 break; 48 case -ECONNRESET: 49 errmsg = "unlinked asynchronuously"; 50 break; 51 case -ENOSR: 52 errmsg = "Buffer error (overrun)"; 53 break; 54 case -EPIPE: 55 errmsg = "Stalled (device not responding)"; 56 break; 57 case -EOVERFLOW: 58 errmsg = "Babble (bad cable?)"; 59 break; 60 case -EPROTO: 61 errmsg = "Bit-stuff error (bad cable?)"; 62 break; 63 case -EILSEQ: 64 errmsg = "CRC/Timeout (could be anything)"; 65 break; 66 case -ETIME: 67 errmsg = "Device does not respond"; 68 break; 69 } 70 if (packet < 0) { 71 dev_err(dev->dev, 72 "URB status %d [%s].\n", status, errmsg); 73 } else { 74 dev_err(dev->dev, 75 "URB packet %d, status %d [%s].\n", 76 packet, status, errmsg); 77 } 78 } 79 80 /* 81 * Controls the isoc copy of each urb packet 82 */ 83 static inline int cx231xx_isoc_vbi_copy(struct cx231xx *dev, struct urb *urb) 84 { 85 struct cx231xx_dmaqueue *dma_q = urb->context; 86 int rc = 1; 87 unsigned char *p_buffer; 88 u32 bytes_parsed = 0, buffer_size = 0; 89 u8 sav_eav = 0; 90 91 if (!dev) 92 return 0; 93 94 if (dev->state & DEV_DISCONNECTED) 95 return 0; 96 97 if (urb->status < 0) { 98 print_err_status(dev, -1, urb->status); 99 if (urb->status == -ENOENT) 100 return 0; 101 } 102 103 /* get buffer pointer and length */ 104 p_buffer = urb->transfer_buffer; 105 buffer_size = urb->actual_length; 106 107 if (buffer_size > 0) { 108 bytes_parsed = 0; 109 110 if (dma_q->is_partial_line) { 111 /* Handle the case where we were working on a partial 112 line */ 113 sav_eav = dma_q->last_sav; 114 } else { 115 /* Check for a SAV/EAV overlapping the 116 buffer boundary */ 117 118 sav_eav = cx231xx_find_boundary_SAV_EAV(p_buffer, 119 dma_q->partial_buf, 120 &bytes_parsed); 121 } 122 123 sav_eav &= 0xF0; 124 /* Get the first line if we have some portion of an SAV/EAV from 125 the last buffer or a partial line */ 126 if (sav_eav) { 127 bytes_parsed += cx231xx_get_vbi_line(dev, dma_q, 128 sav_eav, /* SAV/EAV */ 129 p_buffer + bytes_parsed, /* p_buffer */ 130 buffer_size - bytes_parsed); /* buffer size */ 131 } 132 133 /* Now parse data that is completely in this buffer */ 134 dma_q->is_partial_line = 0; 135 136 while (bytes_parsed < buffer_size) { 137 u32 bytes_used = 0; 138 139 sav_eav = cx231xx_find_next_SAV_EAV( 140 p_buffer + bytes_parsed, /* p_buffer */ 141 buffer_size - bytes_parsed, /* buffer size */ 142 &bytes_used); /* bytes used to get SAV/EAV */ 143 144 bytes_parsed += bytes_used; 145 146 sav_eav &= 0xF0; 147 if (sav_eav && (bytes_parsed < buffer_size)) { 148 bytes_parsed += cx231xx_get_vbi_line(dev, 149 dma_q, sav_eav, /* SAV/EAV */ 150 p_buffer+bytes_parsed, /* p_buffer */ 151 buffer_size-bytes_parsed);/*buf size*/ 152 } 153 } 154 155 /* Save the last four bytes of the buffer so we can 156 check the buffer boundary condition next time */ 157 memcpy(dma_q->partial_buf, p_buffer + buffer_size - 4, 4); 158 bytes_parsed = 0; 159 } 160 161 return rc; 162 } 163 164 /* ------------------------------------------------------------------ 165 Vbi buf operations 166 ------------------------------------------------------------------*/ 167 168 static int 169 vbi_buffer_setup(struct videobuf_queue *vq, unsigned int *count, 170 unsigned int *size) 171 { 172 struct cx231xx_fh *fh = vq->priv_data; 173 struct cx231xx *dev = fh->dev; 174 u32 height = 0; 175 176 height = ((dev->norm & V4L2_STD_625_50) ? 177 PAL_VBI_LINES : NTSC_VBI_LINES); 178 179 *size = (dev->width * height * 2 * 2); 180 if (0 == *count) 181 *count = CX231XX_DEF_VBI_BUF; 182 183 if (*count < CX231XX_MIN_BUF) 184 *count = CX231XX_MIN_BUF; 185 186 return 0; 187 } 188 189 /* This is called *without* dev->slock held; please keep it that way */ 190 static void free_buffer(struct videobuf_queue *vq, struct cx231xx_buffer *buf) 191 { 192 struct cx231xx_fh *fh = vq->priv_data; 193 struct cx231xx *dev = fh->dev; 194 unsigned long flags = 0; 195 if (in_interrupt()) 196 BUG(); 197 198 /* We used to wait for the buffer to finish here, but this didn't work 199 because, as we were keeping the state as VIDEOBUF_QUEUED, 200 videobuf_queue_cancel marked it as finished for us. 201 (Also, it could wedge forever if the hardware was misconfigured.) 202 203 This should be safe; by the time we get here, the buffer isn't 204 queued anymore. If we ever start marking the buffers as 205 VIDEOBUF_ACTIVE, it won't be, though. 206 */ 207 spin_lock_irqsave(&dev->vbi_mode.slock, flags); 208 if (dev->vbi_mode.bulk_ctl.buf == buf) 209 dev->vbi_mode.bulk_ctl.buf = NULL; 210 spin_unlock_irqrestore(&dev->vbi_mode.slock, flags); 211 212 videobuf_vmalloc_free(&buf->vb); 213 buf->vb.state = VIDEOBUF_NEEDS_INIT; 214 } 215 216 static int 217 vbi_buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb, 218 enum v4l2_field field) 219 { 220 struct cx231xx_fh *fh = vq->priv_data; 221 struct cx231xx_buffer *buf = 222 container_of(vb, struct cx231xx_buffer, vb); 223 struct cx231xx *dev = fh->dev; 224 int rc = 0, urb_init = 0; 225 u32 height = 0; 226 227 height = ((dev->norm & V4L2_STD_625_50) ? 228 PAL_VBI_LINES : NTSC_VBI_LINES); 229 buf->vb.size = ((dev->width << 1) * height * 2); 230 231 if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size) 232 return -EINVAL; 233 234 buf->vb.width = dev->width; 235 buf->vb.height = height; 236 buf->vb.field = field; 237 buf->vb.field = V4L2_FIELD_SEQ_TB; 238 239 if (VIDEOBUF_NEEDS_INIT == buf->vb.state) { 240 rc = videobuf_iolock(vq, &buf->vb, NULL); 241 if (rc < 0) 242 goto fail; 243 } 244 245 if (!dev->vbi_mode.bulk_ctl.num_bufs) 246 urb_init = 1; 247 248 if (urb_init) { 249 rc = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS, 250 CX231XX_NUM_VBI_BUFS, 251 dev->vbi_mode.alt_max_pkt_size[0], 252 cx231xx_isoc_vbi_copy); 253 if (rc < 0) 254 goto fail; 255 } 256 257 buf->vb.state = VIDEOBUF_PREPARED; 258 return 0; 259 260 fail: 261 free_buffer(vq, buf); 262 return rc; 263 } 264 265 static void 266 vbi_buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb) 267 { 268 struct cx231xx_buffer *buf = 269 container_of(vb, struct cx231xx_buffer, vb); 270 struct cx231xx_fh *fh = vq->priv_data; 271 struct cx231xx *dev = fh->dev; 272 struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq; 273 274 buf->vb.state = VIDEOBUF_QUEUED; 275 list_add_tail(&buf->vb.queue, &vidq->active); 276 277 } 278 279 static void vbi_buffer_release(struct videobuf_queue *vq, 280 struct videobuf_buffer *vb) 281 { 282 struct cx231xx_buffer *buf = 283 container_of(vb, struct cx231xx_buffer, vb); 284 285 286 free_buffer(vq, buf); 287 } 288 289 struct videobuf_queue_ops cx231xx_vbi_qops = { 290 .buf_setup = vbi_buffer_setup, 291 .buf_prepare = vbi_buffer_prepare, 292 .buf_queue = vbi_buffer_queue, 293 .buf_release = vbi_buffer_release, 294 }; 295 296 /* ------------------------------------------------------------------ 297 URB control 298 ------------------------------------------------------------------*/ 299 300 /* 301 * IRQ callback, called by URB callback 302 */ 303 static void cx231xx_irq_vbi_callback(struct urb *urb) 304 { 305 struct cx231xx_dmaqueue *dma_q = urb->context; 306 struct cx231xx_video_mode *vmode = 307 container_of(dma_q, struct cx231xx_video_mode, vidq); 308 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode); 309 310 switch (urb->status) { 311 case 0: /* success */ 312 case -ETIMEDOUT: /* NAK */ 313 break; 314 case -ECONNRESET: /* kill */ 315 case -ENOENT: 316 case -ESHUTDOWN: 317 return; 318 default: /* error */ 319 dev_err(dev->dev, 320 "urb completition error %d.\n", urb->status); 321 break; 322 } 323 324 /* Copy data from URB */ 325 spin_lock(&dev->vbi_mode.slock); 326 dev->vbi_mode.bulk_ctl.bulk_copy(dev, urb); 327 spin_unlock(&dev->vbi_mode.slock); 328 329 /* Reset status */ 330 urb->status = 0; 331 332 urb->status = usb_submit_urb(urb, GFP_ATOMIC); 333 if (urb->status) { 334 dev_err(dev->dev, "urb resubmit failed (error=%i)\n", 335 urb->status); 336 } 337 } 338 339 /* 340 * Stop and Deallocate URBs 341 */ 342 void cx231xx_uninit_vbi_isoc(struct cx231xx *dev) 343 { 344 struct urb *urb; 345 int i; 346 347 dev_dbg(dev->dev, "called cx231xx_uninit_vbi_isoc\n"); 348 349 dev->vbi_mode.bulk_ctl.nfields = -1; 350 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) { 351 urb = dev->vbi_mode.bulk_ctl.urb[i]; 352 if (urb) { 353 if (!irqs_disabled()) 354 usb_kill_urb(urb); 355 else 356 usb_unlink_urb(urb); 357 358 if (dev->vbi_mode.bulk_ctl.transfer_buffer[i]) { 359 360 kfree(dev->vbi_mode.bulk_ctl. 361 transfer_buffer[i]); 362 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = 363 NULL; 364 } 365 usb_free_urb(urb); 366 dev->vbi_mode.bulk_ctl.urb[i] = NULL; 367 } 368 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = NULL; 369 } 370 371 kfree(dev->vbi_mode.bulk_ctl.urb); 372 kfree(dev->vbi_mode.bulk_ctl.transfer_buffer); 373 374 dev->vbi_mode.bulk_ctl.urb = NULL; 375 dev->vbi_mode.bulk_ctl.transfer_buffer = NULL; 376 dev->vbi_mode.bulk_ctl.num_bufs = 0; 377 378 cx231xx_capture_start(dev, 0, Vbi); 379 } 380 EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc); 381 382 /* 383 * Allocate URBs and start IRQ 384 */ 385 int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets, 386 int num_bufs, int max_pkt_size, 387 int (*bulk_copy) (struct cx231xx *dev, 388 struct urb *urb)) 389 { 390 struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq; 391 int i; 392 int sb_size, pipe; 393 struct urb *urb; 394 int rc; 395 396 dev_dbg(dev->dev, "called cx231xx_vbi_isoc\n"); 397 398 /* De-allocates all pending stuff */ 399 cx231xx_uninit_vbi_isoc(dev); 400 401 /* clear if any halt */ 402 usb_clear_halt(dev->udev, 403 usb_rcvbulkpipe(dev->udev, 404 dev->vbi_mode.end_point_addr)); 405 406 dev->vbi_mode.bulk_ctl.bulk_copy = bulk_copy; 407 dev->vbi_mode.bulk_ctl.num_bufs = num_bufs; 408 dma_q->pos = 0; 409 dma_q->is_partial_line = 0; 410 dma_q->last_sav = 0; 411 dma_q->current_field = -1; 412 dma_q->bytes_left_in_line = dev->width << 1; 413 dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ? 414 PAL_VBI_LINES : NTSC_VBI_LINES); 415 dma_q->lines_completed = 0; 416 for (i = 0; i < 8; i++) 417 dma_q->partial_buf[i] = 0; 418 419 dev->vbi_mode.bulk_ctl.urb = kzalloc(sizeof(void *) * num_bufs, 420 GFP_KERNEL); 421 if (!dev->vbi_mode.bulk_ctl.urb) { 422 dev_err(dev->dev, 423 "cannot alloc memory for usb buffers\n"); 424 return -ENOMEM; 425 } 426 427 dev->vbi_mode.bulk_ctl.transfer_buffer = 428 kzalloc(sizeof(void *) * num_bufs, GFP_KERNEL); 429 if (!dev->vbi_mode.bulk_ctl.transfer_buffer) { 430 dev_err(dev->dev, 431 "cannot allocate memory for usbtransfer\n"); 432 kfree(dev->vbi_mode.bulk_ctl.urb); 433 return -ENOMEM; 434 } 435 436 dev->vbi_mode.bulk_ctl.max_pkt_size = max_pkt_size; 437 dev->vbi_mode.bulk_ctl.buf = NULL; 438 439 sb_size = max_packets * dev->vbi_mode.bulk_ctl.max_pkt_size; 440 441 /* allocate urbs and transfer buffers */ 442 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) { 443 444 urb = usb_alloc_urb(0, GFP_KERNEL); 445 if (!urb) { 446 dev_err(dev->dev, 447 "cannot alloc bulk_ctl.urb %i\n", i); 448 cx231xx_uninit_vbi_isoc(dev); 449 return -ENOMEM; 450 } 451 dev->vbi_mode.bulk_ctl.urb[i] = urb; 452 urb->transfer_flags = 0; 453 454 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = 455 kzalloc(sb_size, GFP_KERNEL); 456 if (!dev->vbi_mode.bulk_ctl.transfer_buffer[i]) { 457 dev_err(dev->dev, 458 "unable to allocate %i bytes for transfer buffer %i%s\n", 459 sb_size, i, 460 in_interrupt() ? " while in int" : ""); 461 cx231xx_uninit_vbi_isoc(dev); 462 return -ENOMEM; 463 } 464 465 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr); 466 usb_fill_bulk_urb(urb, dev->udev, pipe, 467 dev->vbi_mode.bulk_ctl.transfer_buffer[i], 468 sb_size, cx231xx_irq_vbi_callback, dma_q); 469 } 470 471 init_waitqueue_head(&dma_q->wq); 472 473 /* submit urbs and enables IRQ */ 474 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) { 475 rc = usb_submit_urb(dev->vbi_mode.bulk_ctl.urb[i], GFP_ATOMIC); 476 if (rc) { 477 dev_err(dev->dev, 478 "submit of urb %i failed (error=%i)\n", i, rc); 479 cx231xx_uninit_vbi_isoc(dev); 480 return rc; 481 } 482 } 483 484 cx231xx_capture_start(dev, 1, Vbi); 485 486 return 0; 487 } 488 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc); 489 490 u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, 491 u8 sav_eav, u8 *p_buffer, u32 buffer_size) 492 { 493 u32 bytes_copied = 0; 494 int current_field = -1; 495 496 switch (sav_eav) { 497 498 case SAV_VBI_FIELD1: 499 current_field = 1; 500 break; 501 502 case SAV_VBI_FIELD2: 503 current_field = 2; 504 break; 505 default: 506 break; 507 } 508 509 if (current_field < 0) 510 return bytes_copied; 511 512 dma_q->last_sav = sav_eav; 513 514 bytes_copied = 515 cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size, 516 current_field); 517 518 return bytes_copied; 519 } 520 521 /* 522 * Announces that a buffer were filled and request the next 523 */ 524 static inline void vbi_buffer_filled(struct cx231xx *dev, 525 struct cx231xx_dmaqueue *dma_q, 526 struct cx231xx_buffer *buf) 527 { 528 /* Advice that buffer was filled */ 529 /* dev_dbg(dev->dev, "[%p/%d] wakeup\n", buf, buf->vb.i); */ 530 531 buf->vb.state = VIDEOBUF_DONE; 532 buf->vb.field_count++; 533 v4l2_get_timestamp(&buf->vb.ts); 534 535 dev->vbi_mode.bulk_ctl.buf = NULL; 536 537 list_del(&buf->vb.queue); 538 wake_up(&buf->vb.done); 539 } 540 541 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, 542 u8 *p_line, u32 length, int field_number) 543 { 544 u32 bytes_to_copy; 545 struct cx231xx_buffer *buf; 546 u32 _line_size = dev->width * 2; 547 548 if (dma_q->current_field == -1) { 549 /* Just starting up */ 550 cx231xx_reset_vbi_buffer(dev, dma_q); 551 } 552 553 if (dma_q->current_field != field_number) 554 dma_q->lines_completed = 0; 555 556 /* get the buffer pointer */ 557 buf = dev->vbi_mode.bulk_ctl.buf; 558 559 /* Remember the field number for next time */ 560 dma_q->current_field = field_number; 561 562 bytes_to_copy = dma_q->bytes_left_in_line; 563 if (bytes_to_copy > length) 564 bytes_to_copy = length; 565 566 if (dma_q->lines_completed >= dma_q->lines_per_field) { 567 dma_q->bytes_left_in_line -= bytes_to_copy; 568 dma_q->is_partial_line = 569 (dma_q->bytes_left_in_line == 0) ? 0 : 1; 570 return 0; 571 } 572 573 dma_q->is_partial_line = 1; 574 575 /* If we don't have a buffer, just return the number of bytes we would 576 have copied if we had a buffer. */ 577 if (!buf) { 578 dma_q->bytes_left_in_line -= bytes_to_copy; 579 dma_q->is_partial_line = 580 (dma_q->bytes_left_in_line == 0) ? 0 : 1; 581 return bytes_to_copy; 582 } 583 584 /* copy the data to video buffer */ 585 cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy); 586 587 dma_q->pos += bytes_to_copy; 588 dma_q->bytes_left_in_line -= bytes_to_copy; 589 590 if (dma_q->bytes_left_in_line == 0) { 591 592 dma_q->bytes_left_in_line = _line_size; 593 dma_q->lines_completed++; 594 dma_q->is_partial_line = 0; 595 596 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) { 597 598 vbi_buffer_filled(dev, dma_q, buf); 599 600 dma_q->pos = 0; 601 dma_q->lines_completed = 0; 602 cx231xx_reset_vbi_buffer(dev, dma_q); 603 } 604 } 605 606 return bytes_to_copy; 607 } 608 609 /* 610 * video-buf generic routine to get the next available buffer 611 */ 612 static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q, 613 struct cx231xx_buffer **buf) 614 { 615 struct cx231xx_video_mode *vmode = 616 container_of(dma_q, struct cx231xx_video_mode, vidq); 617 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode); 618 char *outp; 619 620 if (list_empty(&dma_q->active)) { 621 dev_err(dev->dev, "No active queue to serve\n"); 622 dev->vbi_mode.bulk_ctl.buf = NULL; 623 *buf = NULL; 624 return; 625 } 626 627 /* Get the next buffer */ 628 *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue); 629 630 /* Cleans up buffer - Useful for testing for frame/URB loss */ 631 outp = videobuf_to_vmalloc(&(*buf)->vb); 632 memset(outp, 0, (*buf)->vb.size); 633 634 dev->vbi_mode.bulk_ctl.buf = *buf; 635 636 return; 637 } 638 639 void cx231xx_reset_vbi_buffer(struct cx231xx *dev, 640 struct cx231xx_dmaqueue *dma_q) 641 { 642 struct cx231xx_buffer *buf; 643 644 buf = dev->vbi_mode.bulk_ctl.buf; 645 646 if (buf == NULL) { 647 /* first try to get the buffer */ 648 get_next_vbi_buf(dma_q, &buf); 649 650 dma_q->pos = 0; 651 dma_q->current_field = -1; 652 } 653 654 dma_q->bytes_left_in_line = dev->width << 1; 655 dma_q->lines_completed = 0; 656 } 657 658 int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, 659 u8 *p_buffer, u32 bytes_to_copy) 660 { 661 u8 *p_out_buffer = NULL; 662 u32 current_line_bytes_copied = 0; 663 struct cx231xx_buffer *buf; 664 u32 _line_size = dev->width << 1; 665 void *startwrite; 666 int offset, lencopy; 667 668 buf = dev->vbi_mode.bulk_ctl.buf; 669 670 if (buf == NULL) 671 return -EINVAL; 672 673 p_out_buffer = videobuf_to_vmalloc(&buf->vb); 674 675 if (dma_q->bytes_left_in_line != _line_size) { 676 current_line_bytes_copied = 677 _line_size - dma_q->bytes_left_in_line; 678 } 679 680 offset = (dma_q->lines_completed * _line_size) + 681 current_line_bytes_copied; 682 683 if (dma_q->current_field == 2) { 684 /* Populate the second half of the frame */ 685 offset += (dev->width * 2 * dma_q->lines_per_field); 686 } 687 688 /* prepare destination address */ 689 startwrite = p_out_buffer + offset; 690 691 lencopy = dma_q->bytes_left_in_line > bytes_to_copy ? 692 bytes_to_copy : dma_q->bytes_left_in_line; 693 694 memcpy(startwrite, p_buffer, lencopy); 695 696 return 0; 697 } 698 699 u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev, 700 struct cx231xx_dmaqueue *dma_q) 701 { 702 u32 height = 0; 703 704 height = ((dev->norm & V4L2_STD_625_50) ? 705 PAL_VBI_LINES : NTSC_VBI_LINES); 706 if (dma_q->lines_completed == height && dma_q->current_field == 2) 707 return 1; 708 else 709 return 0; 710 } 711