drivers/media/usb/cx231xx/cx231xx-vbi.c

   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 }