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 <linux/init.h> 23 #include <linux/list.h> 24 #include <linux/module.h> 25 #include <linux/kernel.h> 26 #include <linux/bitmap.h> 27 #include <linux/usb.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/v4l2-chip-ident.h> 36 #include <media/msp3400.h> 37 #include <media/tuner.h> 38 39 #include "cx231xx.h" 40 #include "cx231xx-vbi.h" 41 42 static inline void print_err_status(struct cx231xx *dev, int packet, int status) 43 { 44 char *errmsg = "Unknown"; 45 46 switch (status) { 47 case -ENOENT: 48 errmsg = "unlinked synchronuously"; 49 break; 50 case -ECONNRESET: 51 errmsg = "unlinked asynchronuously"; 52 break; 53 case -ENOSR: 54 errmsg = "Buffer error (overrun)"; 55 break; 56 case -EPIPE: 57 errmsg = "Stalled (device not responding)"; 58 break; 59 case -EOVERFLOW: 60 errmsg = "Babble (bad cable?)"; 61 break; 62 case -EPROTO: 63 errmsg = "Bit-stuff error (bad cable?)"; 64 break; 65 case -EILSEQ: 66 errmsg = "CRC/Timeout (could be anything)"; 67 break; 68 case -ETIME: 69 errmsg = "Device does not respond"; 70 break; 71 } 72 if (packet < 0) { 73 cx231xx_err("URB status %d [%s].\n", status, 74 errmsg); 75 } else { 76 cx231xx_err("URB packet %d, status %d [%s].\n", 77 packet, status, errmsg); 78 } 79 } 80 81 /* 82 * Controls the isoc copy of each urb packet 83 */ 84 static inline int cx231xx_isoc_vbi_copy(struct cx231xx *dev, struct urb *urb) 85 { 86 struct cx231xx_dmaqueue *dma_q = urb->context; 87 int rc = 1; 88 unsigned char *p_buffer; 89 u32 bytes_parsed = 0, buffer_size = 0; 90 u8 sav_eav = 0; 91 92 if (!dev) 93 return 0; 94 95 if (dev->state & DEV_DISCONNECTED) 96 return 0; 97 98 if (urb->status < 0) { 99 print_err_status(dev, -1, urb->status); 100 if (urb->status == -ENOENT) 101 return 0; 102 } 103 104 /* get buffer pointer and length */ 105 p_buffer = urb->transfer_buffer; 106 buffer_size = urb->actual_length; 107 108 if (buffer_size > 0) { 109 bytes_parsed = 0; 110 111 if (dma_q->is_partial_line) { 112 /* Handle the case where we were working on a partial 113 line */ 114 sav_eav = dma_q->last_sav; 115 } else { 116 /* Check for a SAV/EAV overlapping the 117 buffer boundary */ 118 119 sav_eav = cx231xx_find_boundary_SAV_EAV(p_buffer, 120 dma_q->partial_buf, 121 &bytes_parsed); 122 } 123 124 sav_eav &= 0xF0; 125 /* Get the first line if we have some portion of an SAV/EAV from 126 the last buffer or a partial line */ 127 if (sav_eav) { 128 bytes_parsed += cx231xx_get_vbi_line(dev, dma_q, 129 sav_eav, /* SAV/EAV */ 130 p_buffer + bytes_parsed, /* p_buffer */ 131 buffer_size - bytes_parsed); /* buffer size */ 132 } 133 134 /* Now parse data that is completely in this buffer */ 135 dma_q->is_partial_line = 0; 136 137 while (bytes_parsed < buffer_size) { 138 u32 bytes_used = 0; 139 140 sav_eav = cx231xx_find_next_SAV_EAV( 141 p_buffer + bytes_parsed, /* p_buffer */ 142 buffer_size - bytes_parsed, /* buffer size */ 143 &bytes_used); /* bytes used to get SAV/EAV */ 144 145 bytes_parsed += bytes_used; 146 147 sav_eav &= 0xF0; 148 if (sav_eav && (bytes_parsed < buffer_size)) { 149 bytes_parsed += cx231xx_get_vbi_line(dev, 150 dma_q, sav_eav, /* SAV/EAV */ 151 p_buffer+bytes_parsed, /* p_buffer */ 152 buffer_size-bytes_parsed);/*buf size*/ 153 } 154 } 155 156 /* Save the last four bytes of the buffer so we can 157 check the buffer boundary condition next time */ 158 memcpy(dma_q->partial_buf, p_buffer + buffer_size - 4, 4); 159 bytes_parsed = 0; 160 } 161 162 return rc; 163 } 164 165 /* ------------------------------------------------------------------ 166 Vbi buf operations 167 ------------------------------------------------------------------*/ 168 169 static int 170 vbi_buffer_setup(struct videobuf_queue *vq, unsigned int *count, 171 unsigned int *size) 172 { 173 struct cx231xx_fh *fh = vq->priv_data; 174 struct cx231xx *dev = fh->dev; 175 u32 height = 0; 176 177 height = ((dev->norm & V4L2_STD_625_50) ? 178 PAL_VBI_LINES : NTSC_VBI_LINES); 179 180 *size = (dev->width * height * 2 * 2); 181 if (0 == *count) 182 *count = CX231XX_DEF_VBI_BUF; 183 184 if (*count < CX231XX_MIN_BUF) 185 *count = CX231XX_MIN_BUF; 186 187 return 0; 188 } 189 190 /* This is called *without* dev->slock held; please keep it that way */ 191 static void free_buffer(struct videobuf_queue *vq, struct cx231xx_buffer *buf) 192 { 193 struct cx231xx_fh *fh = vq->priv_data; 194 struct cx231xx *dev = fh->dev; 195 unsigned long flags = 0; 196 if (in_interrupt()) 197 BUG(); 198 199 /* We used to wait for the buffer to finish here, but this didn't work 200 because, as we were keeping the state as VIDEOBUF_QUEUED, 201 videobuf_queue_cancel marked it as finished for us. 202 (Also, it could wedge forever if the hardware was misconfigured.) 203 204 This should be safe; by the time we get here, the buffer isn't 205 queued anymore. If we ever start marking the buffers as 206 VIDEOBUF_ACTIVE, it won't be, though. 207 */ 208 spin_lock_irqsave(&dev->vbi_mode.slock, flags); 209 if (dev->vbi_mode.bulk_ctl.buf == buf) 210 dev->vbi_mode.bulk_ctl.buf = NULL; 211 spin_unlock_irqrestore(&dev->vbi_mode.slock, flags); 212 213 videobuf_vmalloc_free(&buf->vb); 214 buf->vb.state = VIDEOBUF_NEEDS_INIT; 215 } 216 217 static int 218 vbi_buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb, 219 enum v4l2_field field) 220 { 221 struct cx231xx_fh *fh = vq->priv_data; 222 struct cx231xx_buffer *buf = 223 container_of(vb, struct cx231xx_buffer, vb); 224 struct cx231xx *dev = fh->dev; 225 int rc = 0, urb_init = 0; 226 u32 height = 0; 227 228 height = ((dev->norm & V4L2_STD_625_50) ? 229 PAL_VBI_LINES : NTSC_VBI_LINES); 230 buf->vb.size = ((dev->width << 1) * height * 2); 231 232 if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size) 233 return -EINVAL; 234 235 buf->vb.width = dev->width; 236 buf->vb.height = height; 237 buf->vb.field = field; 238 buf->vb.field = V4L2_FIELD_SEQ_TB; 239 240 if (VIDEOBUF_NEEDS_INIT == buf->vb.state) { 241 rc = videobuf_iolock(vq, &buf->vb, NULL); 242 if (rc < 0) 243 goto fail; 244 } 245 246 if (!dev->vbi_mode.bulk_ctl.num_bufs) 247 urb_init = 1; 248 249 if (urb_init) { 250 rc = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS, 251 CX231XX_NUM_VBI_BUFS, 252 dev->vbi_mode.alt_max_pkt_size[0], 253 cx231xx_isoc_vbi_copy); 254 if (rc < 0) 255 goto fail; 256 } 257 258 buf->vb.state = VIDEOBUF_PREPARED; 259 return 0; 260 261 fail: 262 free_buffer(vq, buf); 263 return rc; 264 } 265 266 static void 267 vbi_buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb) 268 { 269 struct cx231xx_buffer *buf = 270 container_of(vb, struct cx231xx_buffer, vb); 271 struct cx231xx_fh *fh = vq->priv_data; 272 struct cx231xx *dev = fh->dev; 273 struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq; 274 275 buf->vb.state = VIDEOBUF_QUEUED; 276 list_add_tail(&buf->vb.queue, &vidq->active); 277 278 } 279 280 static void vbi_buffer_release(struct videobuf_queue *vq, 281 struct videobuf_buffer *vb) 282 { 283 struct cx231xx_buffer *buf = 284 container_of(vb, struct cx231xx_buffer, vb); 285 286 287 free_buffer(vq, buf); 288 } 289 290 struct videobuf_queue_ops cx231xx_vbi_qops = { 291 .buf_setup = vbi_buffer_setup, 292 .buf_prepare = vbi_buffer_prepare, 293 .buf_queue = vbi_buffer_queue, 294 .buf_release = vbi_buffer_release, 295 }; 296 297 /* ------------------------------------------------------------------ 298 URB control 299 ------------------------------------------------------------------*/ 300 301 /* 302 * IRQ callback, called by URB callback 303 */ 304 static void cx231xx_irq_vbi_callback(struct urb *urb) 305 { 306 struct cx231xx_dmaqueue *dma_q = urb->context; 307 struct cx231xx_video_mode *vmode = 308 container_of(dma_q, struct cx231xx_video_mode, vidq); 309 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode); 310 311 switch (urb->status) { 312 case 0: /* success */ 313 case -ETIMEDOUT: /* NAK */ 314 break; 315 case -ECONNRESET: /* kill */ 316 case -ENOENT: 317 case -ESHUTDOWN: 318 return; 319 default: /* error */ 320 cx231xx_err("urb completition error %d.\n", 321 urb->status); 322 break; 323 } 324 325 /* Copy data from URB */ 326 spin_lock(&dev->vbi_mode.slock); 327 dev->vbi_mode.bulk_ctl.bulk_copy(dev, urb); 328 spin_unlock(&dev->vbi_mode.slock); 329 330 /* Reset status */ 331 urb->status = 0; 332 333 urb->status = usb_submit_urb(urb, GFP_ATOMIC); 334 if (urb->status) { 335 cx231xx_err("urb resubmit failed (error=%i)\n", 336 urb->status); 337 } 338 } 339 340 /* 341 * Stop and Deallocate URBs 342 */ 343 void cx231xx_uninit_vbi_isoc(struct cx231xx *dev) 344 { 345 struct urb *urb; 346 int i; 347 348 cx231xx_info("called cx231xx_uninit_vbi_isoc\n"); 349 350 dev->vbi_mode.bulk_ctl.nfields = -1; 351 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) { 352 urb = dev->vbi_mode.bulk_ctl.urb[i]; 353 if (urb) { 354 if (!irqs_disabled()) 355 usb_kill_urb(urb); 356 else 357 usb_unlink_urb(urb); 358 359 if (dev->vbi_mode.bulk_ctl.transfer_buffer[i]) { 360 361 kfree(dev->vbi_mode.bulk_ctl. 362 transfer_buffer[i]); 363 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = 364 NULL; 365 } 366 usb_free_urb(urb); 367 dev->vbi_mode.bulk_ctl.urb[i] = NULL; 368 } 369 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = NULL; 370 } 371 372 kfree(dev->vbi_mode.bulk_ctl.urb); 373 kfree(dev->vbi_mode.bulk_ctl.transfer_buffer); 374 375 dev->vbi_mode.bulk_ctl.urb = NULL; 376 dev->vbi_mode.bulk_ctl.transfer_buffer = NULL; 377 dev->vbi_mode.bulk_ctl.num_bufs = 0; 378 379 cx231xx_capture_start(dev, 0, Vbi); 380 } 381 EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc); 382 383 /* 384 * Allocate URBs and start IRQ 385 */ 386 int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets, 387 int num_bufs, int max_pkt_size, 388 int (*bulk_copy) (struct cx231xx *dev, 389 struct urb *urb)) 390 { 391 struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq; 392 int i; 393 int sb_size, pipe; 394 struct urb *urb; 395 int rc; 396 397 cx231xx_info("called cx231xx_vbi_isoc\n"); 398 399 /* De-allocates all pending stuff */ 400 cx231xx_uninit_vbi_isoc(dev); 401 402 /* clear if any halt */ 403 usb_clear_halt(dev->udev, 404 usb_rcvbulkpipe(dev->udev, 405 dev->vbi_mode.end_point_addr)); 406 407 dev->vbi_mode.bulk_ctl.bulk_copy = bulk_copy; 408 dev->vbi_mode.bulk_ctl.num_bufs = num_bufs; 409 dma_q->pos = 0; 410 dma_q->is_partial_line = 0; 411 dma_q->last_sav = 0; 412 dma_q->current_field = -1; 413 dma_q->bytes_left_in_line = dev->width << 1; 414 dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ? 415 PAL_VBI_LINES : NTSC_VBI_LINES); 416 dma_q->lines_completed = 0; 417 for (i = 0; i < 8; i++) 418 dma_q->partial_buf[i] = 0; 419 420 dev->vbi_mode.bulk_ctl.urb = kzalloc(sizeof(void *) * num_bufs, 421 GFP_KERNEL); 422 if (!dev->vbi_mode.bulk_ctl.urb) { 423 cx231xx_errdev("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 cx231xx_errdev("cannot allocate memory for usbtransfer\n"); 431 kfree(dev->vbi_mode.bulk_ctl.urb); 432 return -ENOMEM; 433 } 434 435 dev->vbi_mode.bulk_ctl.max_pkt_size = max_pkt_size; 436 dev->vbi_mode.bulk_ctl.buf = NULL; 437 438 sb_size = max_packets * dev->vbi_mode.bulk_ctl.max_pkt_size; 439 440 /* allocate urbs and transfer buffers */ 441 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) { 442 443 urb = usb_alloc_urb(0, GFP_KERNEL); 444 if (!urb) { 445 cx231xx_err("cannot alloc bulk_ctl.urb %i\n", i); 446 cx231xx_uninit_vbi_isoc(dev); 447 return -ENOMEM; 448 } 449 dev->vbi_mode.bulk_ctl.urb[i] = urb; 450 urb->transfer_flags = 0; 451 452 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = 453 kzalloc(sb_size, GFP_KERNEL); 454 if (!dev->vbi_mode.bulk_ctl.transfer_buffer[i]) { 455 cx231xx_err("unable to allocate %i bytes for transfer" 456 " buffer %i%s\n", sb_size, i, 457 in_interrupt() ? " while in int" : ""); 458 cx231xx_uninit_vbi_isoc(dev); 459 return -ENOMEM; 460 } 461 462 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr); 463 usb_fill_bulk_urb(urb, dev->udev, pipe, 464 dev->vbi_mode.bulk_ctl.transfer_buffer[i], 465 sb_size, cx231xx_irq_vbi_callback, dma_q); 466 } 467 468 init_waitqueue_head(&dma_q->wq); 469 470 /* submit urbs and enables IRQ */ 471 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) { 472 rc = usb_submit_urb(dev->vbi_mode.bulk_ctl.urb[i], GFP_ATOMIC); 473 if (rc) { 474 cx231xx_err("submit of urb %i failed (error=%i)\n", i, 475 rc); 476 cx231xx_uninit_vbi_isoc(dev); 477 return rc; 478 } 479 } 480 481 cx231xx_capture_start(dev, 1, Vbi); 482 483 return 0; 484 } 485 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc); 486 487 u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, 488 u8 sav_eav, u8 *p_buffer, u32 buffer_size) 489 { 490 u32 bytes_copied = 0; 491 int current_field = -1; 492 493 switch (sav_eav) { 494 495 case SAV_VBI_FIELD1: 496 current_field = 1; 497 break; 498 499 case SAV_VBI_FIELD2: 500 current_field = 2; 501 break; 502 default: 503 break; 504 } 505 506 if (current_field < 0) 507 return bytes_copied; 508 509 dma_q->last_sav = sav_eav; 510 511 bytes_copied = 512 cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size, 513 current_field); 514 515 return bytes_copied; 516 } 517 518 /* 519 * Announces that a buffer were filled and request the next 520 */ 521 static inline void vbi_buffer_filled(struct cx231xx *dev, 522 struct cx231xx_dmaqueue *dma_q, 523 struct cx231xx_buffer *buf) 524 { 525 /* Advice that buffer was filled */ 526 /* cx231xx_info("[%p/%d] wakeup\n", buf, buf->vb.i); */ 527 528 buf->vb.state = VIDEOBUF_DONE; 529 buf->vb.field_count++; 530 v4l2_get_timestamp(&buf->vb.ts); 531 532 dev->vbi_mode.bulk_ctl.buf = NULL; 533 534 list_del(&buf->vb.queue); 535 wake_up(&buf->vb.done); 536 } 537 538 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, 539 u8 *p_line, u32 length, int field_number) 540 { 541 u32 bytes_to_copy; 542 struct cx231xx_buffer *buf; 543 u32 _line_size = dev->width * 2; 544 545 if (dma_q->current_field == -1) { 546 /* Just starting up */ 547 cx231xx_reset_vbi_buffer(dev, dma_q); 548 } 549 550 if (dma_q->current_field != field_number) 551 dma_q->lines_completed = 0; 552 553 /* get the buffer pointer */ 554 buf = dev->vbi_mode.bulk_ctl.buf; 555 556 /* Remember the field number for next time */ 557 dma_q->current_field = field_number; 558 559 bytes_to_copy = dma_q->bytes_left_in_line; 560 if (bytes_to_copy > length) 561 bytes_to_copy = length; 562 563 if (dma_q->lines_completed >= dma_q->lines_per_field) { 564 dma_q->bytes_left_in_line -= bytes_to_copy; 565 dma_q->is_partial_line = 566 (dma_q->bytes_left_in_line == 0) ? 0 : 1; 567 return 0; 568 } 569 570 dma_q->is_partial_line = 1; 571 572 /* If we don't have a buffer, just return the number of bytes we would 573 have copied if we had a buffer. */ 574 if (!buf) { 575 dma_q->bytes_left_in_line -= bytes_to_copy; 576 dma_q->is_partial_line = 577 (dma_q->bytes_left_in_line == 0) ? 0 : 1; 578 return bytes_to_copy; 579 } 580 581 /* copy the data to video buffer */ 582 cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy); 583 584 dma_q->pos += bytes_to_copy; 585 dma_q->bytes_left_in_line -= bytes_to_copy; 586 587 if (dma_q->bytes_left_in_line == 0) { 588 589 dma_q->bytes_left_in_line = _line_size; 590 dma_q->lines_completed++; 591 dma_q->is_partial_line = 0; 592 593 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) { 594 595 vbi_buffer_filled(dev, dma_q, buf); 596 597 dma_q->pos = 0; 598 dma_q->lines_completed = 0; 599 cx231xx_reset_vbi_buffer(dev, dma_q); 600 } 601 } 602 603 return bytes_to_copy; 604 } 605 606 /* 607 * video-buf generic routine to get the next available buffer 608 */ 609 static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q, 610 struct cx231xx_buffer **buf) 611 { 612 struct cx231xx_video_mode *vmode = 613 container_of(dma_q, struct cx231xx_video_mode, vidq); 614 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode); 615 char *outp; 616 617 if (list_empty(&dma_q->active)) { 618 cx231xx_err("No active queue to serve\n"); 619 dev->vbi_mode.bulk_ctl.buf = NULL; 620 *buf = NULL; 621 return; 622 } 623 624 /* Get the next buffer */ 625 *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue); 626 627 /* Cleans up buffer - Useful for testing for frame/URB loss */ 628 outp = videobuf_to_vmalloc(&(*buf)->vb); 629 memset(outp, 0, (*buf)->vb.size); 630 631 dev->vbi_mode.bulk_ctl.buf = *buf; 632 633 return; 634 } 635 636 void cx231xx_reset_vbi_buffer(struct cx231xx *dev, 637 struct cx231xx_dmaqueue *dma_q) 638 { 639 struct cx231xx_buffer *buf; 640 641 buf = dev->vbi_mode.bulk_ctl.buf; 642 643 if (buf == NULL) { 644 /* first try to get the buffer */ 645 get_next_vbi_buf(dma_q, &buf); 646 647 dma_q->pos = 0; 648 dma_q->current_field = -1; 649 } 650 651 dma_q->bytes_left_in_line = dev->width << 1; 652 dma_q->lines_completed = 0; 653 } 654 655 int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, 656 u8 *p_buffer, u32 bytes_to_copy) 657 { 658 u8 *p_out_buffer = NULL; 659 u32 current_line_bytes_copied = 0; 660 struct cx231xx_buffer *buf; 661 u32 _line_size = dev->width << 1; 662 void *startwrite; 663 int offset, lencopy; 664 665 buf = dev->vbi_mode.bulk_ctl.buf; 666 667 if (buf == NULL) 668 return -EINVAL; 669 670 p_out_buffer = videobuf_to_vmalloc(&buf->vb); 671 672 if (dma_q->bytes_left_in_line != _line_size) { 673 current_line_bytes_copied = 674 _line_size - dma_q->bytes_left_in_line; 675 } 676 677 offset = (dma_q->lines_completed * _line_size) + 678 current_line_bytes_copied; 679 680 if (dma_q->current_field == 2) { 681 /* Populate the second half of the frame */ 682 offset += (dev->width * 2 * dma_q->lines_per_field); 683 } 684 685 /* prepare destination address */ 686 startwrite = p_out_buffer + offset; 687 688 lencopy = dma_q->bytes_left_in_line > bytes_to_copy ? 689 bytes_to_copy : dma_q->bytes_left_in_line; 690 691 memcpy(startwrite, p_buffer, lencopy); 692 693 return 0; 694 } 695 696 u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev, 697 struct cx231xx_dmaqueue *dma_q) 698 { 699 u32 height = 0; 700 701 height = ((dev->norm & V4L2_STD_625_50) ? 702 PAL_VBI_LINES : NTSC_VBI_LINES); 703 if (dma_q->lines_completed == height && dma_q->current_field == 2) 704 return 1; 705 else 706 return 0; 707 } 708