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/msp3400.h> 36 #include <media/tuner.h> 37 38 #include "cx231xx.h" 39 #include "cx231xx-vbi.h" 40 41 static inline void print_err_status(struct cx231xx *dev, int packet, int status) 42 { 43 char *errmsg = "Unknown"; 44 45 switch (status) { 46 case -ENOENT: 47 errmsg = "unlinked synchronuously"; 48 break; 49 case -ECONNRESET: 50 errmsg = "unlinked asynchronuously"; 51 break; 52 case -ENOSR: 53 errmsg = "Buffer error (overrun)"; 54 break; 55 case -EPIPE: 56 errmsg = "Stalled (device not responding)"; 57 break; 58 case -EOVERFLOW: 59 errmsg = "Babble (bad cable?)"; 60 break; 61 case -EPROTO: 62 errmsg = "Bit-stuff error (bad cable?)"; 63 break; 64 case -EILSEQ: 65 errmsg = "CRC/Timeout (could be anything)"; 66 break; 67 case -ETIME: 68 errmsg = "Device does not respond"; 69 break; 70 } 71 if (packet < 0) { 72 cx231xx_err("URB status %d [%s].\n", status, 73 errmsg); 74 } else { 75 cx231xx_err("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 cx231xx_err("urb completition error %d.\n", 320 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 cx231xx_err("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 cx231xx_info("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 cx231xx_info("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 cx231xx_errdev("cannot alloc memory for usb buffers\n"); 423 return -ENOMEM; 424 } 425 426 dev->vbi_mode.bulk_ctl.transfer_buffer = 427 kzalloc(sizeof(void *) * num_bufs, GFP_KERNEL); 428 if (!dev->vbi_mode.bulk_ctl.transfer_buffer) { 429 cx231xx_errdev("cannot allocate memory for usbtransfer\n"); 430 kfree(dev->vbi_mode.bulk_ctl.urb); 431 return -ENOMEM; 432 } 433 434 dev->vbi_mode.bulk_ctl.max_pkt_size = max_pkt_size; 435 dev->vbi_mode.bulk_ctl.buf = NULL; 436 437 sb_size = max_packets * dev->vbi_mode.bulk_ctl.max_pkt_size; 438 439 /* allocate urbs and transfer buffers */ 440 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) { 441 442 urb = usb_alloc_urb(0, GFP_KERNEL); 443 if (!urb) { 444 cx231xx_err("cannot alloc bulk_ctl.urb %i\n", i); 445 cx231xx_uninit_vbi_isoc(dev); 446 return -ENOMEM; 447 } 448 dev->vbi_mode.bulk_ctl.urb[i] = urb; 449 urb->transfer_flags = 0; 450 451 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = 452 kzalloc(sb_size, GFP_KERNEL); 453 if (!dev->vbi_mode.bulk_ctl.transfer_buffer[i]) { 454 cx231xx_err("unable to allocate %i bytes for transfer" 455 " buffer %i%s\n", sb_size, i, 456 in_interrupt() ? " while in int" : ""); 457 cx231xx_uninit_vbi_isoc(dev); 458 return -ENOMEM; 459 } 460 461 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr); 462 usb_fill_bulk_urb(urb, dev->udev, pipe, 463 dev->vbi_mode.bulk_ctl.transfer_buffer[i], 464 sb_size, cx231xx_irq_vbi_callback, dma_q); 465 } 466 467 init_waitqueue_head(&dma_q->wq); 468 469 /* submit urbs and enables IRQ */ 470 for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) { 471 rc = usb_submit_urb(dev->vbi_mode.bulk_ctl.urb[i], GFP_ATOMIC); 472 if (rc) { 473 cx231xx_err("submit of urb %i failed (error=%i)\n", i, 474 rc); 475 cx231xx_uninit_vbi_isoc(dev); 476 return rc; 477 } 478 } 479 480 cx231xx_capture_start(dev, 1, Vbi); 481 482 return 0; 483 } 484 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc); 485 486 u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, 487 u8 sav_eav, u8 *p_buffer, u32 buffer_size) 488 { 489 u32 bytes_copied = 0; 490 int current_field = -1; 491 492 switch (sav_eav) { 493 494 case SAV_VBI_FIELD1: 495 current_field = 1; 496 break; 497 498 case SAV_VBI_FIELD2: 499 current_field = 2; 500 break; 501 default: 502 break; 503 } 504 505 if (current_field < 0) 506 return bytes_copied; 507 508 dma_q->last_sav = sav_eav; 509 510 bytes_copied = 511 cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size, 512 current_field); 513 514 return bytes_copied; 515 } 516 517 /* 518 * Announces that a buffer were filled and request the next 519 */ 520 static inline void vbi_buffer_filled(struct cx231xx *dev, 521 struct cx231xx_dmaqueue *dma_q, 522 struct cx231xx_buffer *buf) 523 { 524 /* Advice that buffer was filled */ 525 /* cx231xx_info("[%p/%d] wakeup\n", buf, buf->vb.i); */ 526 527 buf->vb.state = VIDEOBUF_DONE; 528 buf->vb.field_count++; 529 v4l2_get_timestamp(&buf->vb.ts); 530 531 dev->vbi_mode.bulk_ctl.buf = NULL; 532 533 list_del(&buf->vb.queue); 534 wake_up(&buf->vb.done); 535 } 536 537 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, 538 u8 *p_line, u32 length, int field_number) 539 { 540 u32 bytes_to_copy; 541 struct cx231xx_buffer *buf; 542 u32 _line_size = dev->width * 2; 543 544 if (dma_q->current_field == -1) { 545 /* Just starting up */ 546 cx231xx_reset_vbi_buffer(dev, dma_q); 547 } 548 549 if (dma_q->current_field != field_number) 550 dma_q->lines_completed = 0; 551 552 /* get the buffer pointer */ 553 buf = dev->vbi_mode.bulk_ctl.buf; 554 555 /* Remember the field number for next time */ 556 dma_q->current_field = field_number; 557 558 bytes_to_copy = dma_q->bytes_left_in_line; 559 if (bytes_to_copy > length) 560 bytes_to_copy = length; 561 562 if (dma_q->lines_completed >= dma_q->lines_per_field) { 563 dma_q->bytes_left_in_line -= bytes_to_copy; 564 dma_q->is_partial_line = 565 (dma_q->bytes_left_in_line == 0) ? 0 : 1; 566 return 0; 567 } 568 569 dma_q->is_partial_line = 1; 570 571 /* If we don't have a buffer, just return the number of bytes we would 572 have copied if we had a buffer. */ 573 if (!buf) { 574 dma_q->bytes_left_in_line -= bytes_to_copy; 575 dma_q->is_partial_line = 576 (dma_q->bytes_left_in_line == 0) ? 0 : 1; 577 return bytes_to_copy; 578 } 579 580 /* copy the data to video buffer */ 581 cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy); 582 583 dma_q->pos += bytes_to_copy; 584 dma_q->bytes_left_in_line -= bytes_to_copy; 585 586 if (dma_q->bytes_left_in_line == 0) { 587 588 dma_q->bytes_left_in_line = _line_size; 589 dma_q->lines_completed++; 590 dma_q->is_partial_line = 0; 591 592 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) { 593 594 vbi_buffer_filled(dev, dma_q, buf); 595 596 dma_q->pos = 0; 597 dma_q->lines_completed = 0; 598 cx231xx_reset_vbi_buffer(dev, dma_q); 599 } 600 } 601 602 return bytes_to_copy; 603 } 604 605 /* 606 * video-buf generic routine to get the next available buffer 607 */ 608 static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q, 609 struct cx231xx_buffer **buf) 610 { 611 struct cx231xx_video_mode *vmode = 612 container_of(dma_q, struct cx231xx_video_mode, vidq); 613 struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode); 614 char *outp; 615 616 if (list_empty(&dma_q->active)) { 617 cx231xx_err("No active queue to serve\n"); 618 dev->vbi_mode.bulk_ctl.buf = NULL; 619 *buf = NULL; 620 return; 621 } 622 623 /* Get the next buffer */ 624 *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue); 625 626 /* Cleans up buffer - Useful for testing for frame/URB loss */ 627 outp = videobuf_to_vmalloc(&(*buf)->vb); 628 memset(outp, 0, (*buf)->vb.size); 629 630 dev->vbi_mode.bulk_ctl.buf = *buf; 631 632 return; 633 } 634 635 void cx231xx_reset_vbi_buffer(struct cx231xx *dev, 636 struct cx231xx_dmaqueue *dma_q) 637 { 638 struct cx231xx_buffer *buf; 639 640 buf = dev->vbi_mode.bulk_ctl.buf; 641 642 if (buf == NULL) { 643 /* first try to get the buffer */ 644 get_next_vbi_buf(dma_q, &buf); 645 646 dma_q->pos = 0; 647 dma_q->current_field = -1; 648 } 649 650 dma_q->bytes_left_in_line = dev->width << 1; 651 dma_q->lines_completed = 0; 652 } 653 654 int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, 655 u8 *p_buffer, u32 bytes_to_copy) 656 { 657 u8 *p_out_buffer = NULL; 658 u32 current_line_bytes_copied = 0; 659 struct cx231xx_buffer *buf; 660 u32 _line_size = dev->width << 1; 661 void *startwrite; 662 int offset, lencopy; 663 664 buf = dev->vbi_mode.bulk_ctl.buf; 665 666 if (buf == NULL) 667 return -EINVAL; 668 669 p_out_buffer = videobuf_to_vmalloc(&buf->vb); 670 671 if (dma_q->bytes_left_in_line != _line_size) { 672 current_line_bytes_copied = 673 _line_size - dma_q->bytes_left_in_line; 674 } 675 676 offset = (dma_q->lines_completed * _line_size) + 677 current_line_bytes_copied; 678 679 if (dma_q->current_field == 2) { 680 /* Populate the second half of the frame */ 681 offset += (dev->width * 2 * dma_q->lines_per_field); 682 } 683 684 /* prepare destination address */ 685 startwrite = p_out_buffer + offset; 686 687 lencopy = dma_q->bytes_left_in_line > bytes_to_copy ? 688 bytes_to_copy : dma_q->bytes_left_in_line; 689 690 memcpy(startwrite, p_buffer, lencopy); 691 692 return 0; 693 } 694 695 u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev, 696 struct cx231xx_dmaqueue *dma_q) 697 { 698 u32 height = 0; 699 700 height = ((dev->norm & V4L2_STD_625_50) ? 701 PAL_VBI_LINES : NTSC_VBI_LINES); 702 if (dma_q->lines_completed == height && dma_q->current_field == 2) 703 return 1; 704 else 705 return 0; 706 } 707