git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/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
  32 #include <media/v4l2-common.h>
  33 #include <media/v4l2-ioctl.h>
  34 #include <media/v4l2-chip-ident.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(DRIVER_NAME "URB status %d [%s].\n", status,
  73                             errmsg);
  74         } else {
  75                 cx231xx_err(DRIVER_NAME "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_buffer *buf;
  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) || (dev->state & DEV_MISCONFIGURED))
  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         buf = dev->vbi_mode.isoc_ctl.buf;
 105
 106         /* get buffer pointer and length */
 107         p_buffer = urb->transfer_buffer;
 108         buffer_size = urb->actual_length;
 109
 110         if (buffer_size > 0) {
 111                 bytes_parsed = 0;
 112
 113                 if (dma_q->is_partial_line) {
 114                         /* Handle the case where we were working on a partial
 115                            line */
 116                         sav_eav = dma_q->last_sav;
 117                 } else {
 118                         /* Check for a SAV/EAV overlapping the
 119                            buffer boundary */
 120
 121                         sav_eav = cx231xx_find_boundary_SAV_EAV(p_buffer,
 122                                                           dma_q->partial_buf,
 123                                                           &bytes_parsed);
 124                 }
 125
 126                 sav_eav &= 0xF0;
 127                 /* Get the first line if we have some portion of an SAV/EAV from
 128                    the last buffer or a partial line */
 129                 if (sav_eav) {
 130                         bytes_parsed += cx231xx_get_vbi_line(dev, dma_q,
 131                                 sav_eav,                       /* SAV/EAV */
 132                                 p_buffer + bytes_parsed,       /* p_buffer */
 133                                 buffer_size - bytes_parsed);   /* buffer size */
 134                 }
 135
 136                 /* Now parse data that is completely in this buffer */
 137                 dma_q->is_partial_line = 0;
 138
 139                 while (bytes_parsed < buffer_size) {
 140                         u32 bytes_used = 0;
 141
 142                         sav_eav = cx231xx_find_next_SAV_EAV(
 143                                 p_buffer + bytes_parsed,        /* p_buffer */
 144                                 buffer_size - bytes_parsed, /* buffer size */
 145                                 &bytes_used);   /* bytes used to get SAV/EAV */
 146
 147                         bytes_parsed += bytes_used;
 148
 149                         sav_eav &= 0xF0;
 150                         if (sav_eav && (bytes_parsed < buffer_size)) {
 151                                 bytes_parsed += cx231xx_get_vbi_line(dev,
 152                                         dma_q, sav_eav, /* SAV/EAV */
 153                                         p_buffer+bytes_parsed, /* p_buffer */
 154                                         buffer_size-bytes_parsed);/*buf size*/
 155                         }
 156                 }
 157
 158                 /* Save the last four bytes of the buffer so we can
 159                 check the buffer boundary condition next time */
 160                 memcpy(dma_q->partial_buf, p_buffer + buffer_size - 4, 4);
 161                 bytes_parsed = 0;
 162         }
 163
 164         return rc;
 165 }
 166
 167 /* ------------------------------------------------------------------
 168         Vbi buf operations
 169    ------------------------------------------------------------------*/
 170
 171 static int
 172 vbi_buffer_setup(struct videobuf_queue *vq, unsigned int *count,
 173                  unsigned int *size)
 174 {
 175         struct cx231xx_fh *fh = vq->priv_data;
 176         struct cx231xx *dev = fh->dev;
 177         u32 height = 0;
 178
 179         height = ((dev->norm & V4L2_STD_625_50) ?
 180                   PAL_VBI_LINES : NTSC_VBI_LINES);
 181
 182         *size = (dev->width * height * 2);
 183         if (0 == *count)
 184                 *count = CX231XX_DEF_VBI_BUF;
 185
 186         if (*count < CX231XX_MIN_BUF)
 187                 *count = CX231XX_MIN_BUF;
 188
 189         return 0;
 190 }
 191
 192 /* This is called *without* dev->slock held; please keep it that way */
 193 static void free_buffer(struct videobuf_queue *vq, struct cx231xx_buffer *buf)
 194 {
 195         struct cx231xx_fh *fh = vq->priv_data;
 196         struct cx231xx *dev = fh->dev;
 197         unsigned long flags = 0;
 198         if (in_interrupt())
 199                 BUG();
 200
 201         /* We used to wait for the buffer to finish here, but this didn't work
 202            because, as we were keeping the state as VIDEOBUF_QUEUED,
 203            videobuf_queue_cancel marked it as finished for us.
 204            (Also, it could wedge forever if the hardware was misconfigured.)
 205
 206            This should be safe; by the time we get here, the buffer isn't
 207            queued anymore. If we ever start marking the buffers as
 208            VIDEOBUF_ACTIVE, it won't be, though.
 209          */
 210         spin_lock_irqsave(&dev->vbi_mode.slock, flags);
 211         if (dev->vbi_mode.isoc_ctl.buf == buf)
 212                 dev->vbi_mode.isoc_ctl.buf = NULL;
 213         spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
 214
 215         videobuf_vmalloc_free(&buf->vb);
 216         buf->vb.state = VIDEOBUF_NEEDS_INIT;
 217 }
 218
 219 static int
 220 vbi_buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
 221                    enum v4l2_field field)
 222 {
 223         struct cx231xx_fh *fh = vq->priv_data;
 224         struct cx231xx_buffer *buf =
 225             container_of(vb, struct cx231xx_buffer, vb);
 226         struct cx231xx *dev = fh->dev;
 227         int rc = 0, urb_init = 0;
 228         u32 height = 0;
 229
 230         height = ((dev->norm & V4L2_STD_625_50) ?
 231                   PAL_VBI_LINES : NTSC_VBI_LINES);
 232         buf->vb.size = ((dev->width << 1) * height);
 233
 234         if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
 235                 return -EINVAL;
 236
 237         buf->vb.width = dev->width;
 238         buf->vb.height = height;
 239         buf->vb.field = field;
 240         buf->vb.field = V4L2_FIELD_SEQ_TB;
 241
 242         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
 243                 rc = videobuf_iolock(vq, &buf->vb, NULL);
 244                 if (rc < 0)
 245                         goto fail;
 246         }
 247
 248         if (!dev->vbi_mode.isoc_ctl.num_bufs)
 249                 urb_init = 1;
 250
 251         if (urb_init) {
 252                 rc = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS,
 253                                            CX231XX_NUM_VBI_BUFS,
 254                                            dev->vbi_mode.alt_max_pkt_size[0],
 255                                            cx231xx_isoc_vbi_copy);
 256                 if (rc < 0)
 257                         goto fail;
 258         }
 259
 260         buf->vb.state = VIDEOBUF_PREPARED;
 261         return 0;
 262
 263 fail:
 264         free_buffer(vq, buf);
 265         return rc;
 266 }
 267
 268 static void
 269 vbi_buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 270 {
 271         struct cx231xx_buffer *buf =
 272             container_of(vb, struct cx231xx_buffer, vb);
 273         struct cx231xx_fh *fh = vq->priv_data;
 274         struct cx231xx *dev = fh->dev;
 275         struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
 276
 277         buf->vb.state = VIDEOBUF_QUEUED;
 278         list_add_tail(&buf->vb.queue, &vidq->active);
 279
 280 }
 281
 282 static void vbi_buffer_release(struct videobuf_queue *vq,
 283                                struct videobuf_buffer *vb)
 284 {
 285         struct cx231xx_buffer *buf =
 286             container_of(vb, struct cx231xx_buffer, vb);
 287
 288
 289         free_buffer(vq, buf);
 290 }
 291
 292 struct videobuf_queue_ops cx231xx_vbi_qops = {
 293         .buf_setup   = vbi_buffer_setup,
 294         .buf_prepare = vbi_buffer_prepare,
 295         .buf_queue   = vbi_buffer_queue,
 296         .buf_release = vbi_buffer_release,
 297 };
 298
 299 /* ------------------------------------------------------------------
 300         URB control
 301    ------------------------------------------------------------------*/
 302
 303 /*
 304  * IRQ callback, called by URB callback
 305  */
 306 static void cx231xx_irq_vbi_callback(struct urb *urb)
 307 {
 308         struct cx231xx_dmaqueue *dma_q = urb->context;
 309         struct cx231xx_video_mode *vmode =
 310             container_of(dma_q, struct cx231xx_video_mode, vidq);
 311         struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
 312         int rc;
 313
 314         switch (urb->status) {
 315         case 0:         /* success */
 316         case -ETIMEDOUT:        /* NAK */
 317                 break;
 318         case -ECONNRESET:       /* kill */
 319         case -ENOENT:
 320         case -ESHUTDOWN:
 321                 return;
 322         default:                /* error */
 323                 cx231xx_err(DRIVER_NAME "urb completition error %d.\n",
 324                             urb->status);
 325                 break;
 326         }
 327
 328         /* Copy data from URB */
 329         spin_lock(&dev->vbi_mode.slock);
 330         rc = dev->vbi_mode.isoc_ctl.isoc_copy(dev, urb);
 331         spin_unlock(&dev->vbi_mode.slock);
 332
 333         /* Reset status */
 334         urb->status = 0;
 335
 336         urb->status = usb_submit_urb(urb, GFP_ATOMIC);
 337         if (urb->status) {
 338                 cx231xx_err(DRIVER_NAME "urb resubmit failed (error=%i)\n",
 339                             urb->status);
 340         }
 341 }
 342
 343 /*
 344  * Stop and Deallocate URBs
 345  */
 346 void cx231xx_uninit_vbi_isoc(struct cx231xx *dev)
 347 {
 348         struct urb *urb;
 349         int i;
 350
 351         cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_uninit_vbi_isoc\n");
 352
 353         dev->vbi_mode.isoc_ctl.nfields = -1;
 354         for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
 355                 urb = dev->vbi_mode.isoc_ctl.urb[i];
 356                 if (urb) {
 357                         if (!irqs_disabled())
 358                                 usb_kill_urb(urb);
 359                         else
 360                                 usb_unlink_urb(urb);
 361
 362                         if (dev->vbi_mode.isoc_ctl.transfer_buffer[i]) {
 363
 364                                 kfree(dev->vbi_mode.isoc_ctl.
 365                                       transfer_buffer[i]);
 366                                 dev->vbi_mode.isoc_ctl.transfer_buffer[i] =
 367                                     NULL;
 368                         }
 369                         usb_free_urb(urb);
 370                         dev->vbi_mode.isoc_ctl.urb[i] = NULL;
 371                 }
 372                 dev->vbi_mode.isoc_ctl.transfer_buffer[i] = NULL;
 373         }
 374
 375         kfree(dev->vbi_mode.isoc_ctl.urb);
 376         kfree(dev->vbi_mode.isoc_ctl.transfer_buffer);
 377
 378         dev->vbi_mode.isoc_ctl.urb = NULL;
 379         dev->vbi_mode.isoc_ctl.transfer_buffer = NULL;
 380         dev->vbi_mode.isoc_ctl.num_bufs = 0;
 381
 382         cx231xx_capture_start(dev, 0, Vbi);
 383 }
 384 EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc);
 385
 386 /*
 387  * Allocate URBs and start IRQ
 388  */
 389 int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets,
 390                           int num_bufs, int max_pkt_size,
 391                           int (*isoc_copy) (struct cx231xx *dev,
 392                                             struct urb *urb))
 393 {
 394         struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq;
 395         int i;
 396         int sb_size, pipe;
 397         struct urb *urb;
 398         int rc;
 399
 400         cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_prepare_isoc\n");
 401
 402         /* De-allocates all pending stuff */
 403         cx231xx_uninit_vbi_isoc(dev);
 404
 405         /* clear if any halt */
 406         usb_clear_halt(dev->udev,
 407                        usb_rcvbulkpipe(dev->udev,
 408                                        dev->vbi_mode.end_point_addr));
 409
 410         dev->vbi_mode.isoc_ctl.isoc_copy = isoc_copy;
 411         dev->vbi_mode.isoc_ctl.num_bufs = num_bufs;
 412         dma_q->pos = 0;
 413         dma_q->is_partial_line = 0;
 414         dma_q->last_sav = 0;
 415         dma_q->current_field = -1;
 416         dma_q->bytes_left_in_line = dev->width << 1;
 417         dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ?
 418                                   PAL_VBI_LINES : NTSC_VBI_LINES);
 419         dma_q->lines_completed = 0;
 420         for (i = 0; i < 8; i++)
 421                 dma_q->partial_buf[i] = 0;
 422
 423         dev->vbi_mode.isoc_ctl.urb = kzalloc(sizeof(void *) * num_bufs,
 424                                              GFP_KERNEL);
 425         if (!dev->vbi_mode.isoc_ctl.urb) {
 426                 cx231xx_errdev("cannot alloc memory for usb buffers\n");
 427                 return -ENOMEM;
 428         }
 429
 430         dev->vbi_mode.isoc_ctl.transfer_buffer =
 431             kzalloc(sizeof(void *) * num_bufs, GFP_KERNEL);
 432         if (!dev->vbi_mode.isoc_ctl.transfer_buffer) {
 433                 cx231xx_errdev("cannot allocate memory for usbtransfer\n");
 434                 kfree(dev->vbi_mode.isoc_ctl.urb);
 435                 return -ENOMEM;
 436         }
 437
 438         dev->vbi_mode.isoc_ctl.max_pkt_size = max_pkt_size;
 439         dev->vbi_mode.isoc_ctl.buf = NULL;
 440
 441         sb_size = max_packets * dev->vbi_mode.isoc_ctl.max_pkt_size;
 442
 443         /* allocate urbs and transfer buffers */
 444         for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
 445
 446                 urb = usb_alloc_urb(0, GFP_KERNEL);
 447                 if (!urb) {
 448                         cx231xx_err(DRIVER_NAME
 449                                     ": cannot alloc isoc_ctl.urb %i\n", i);
 450                         cx231xx_uninit_vbi_isoc(dev);
 451                         return -ENOMEM;
 452                 }
 453                 dev->vbi_mode.isoc_ctl.urb[i] = urb;
 454                 urb->transfer_flags = 0;
 455
 456                 dev->vbi_mode.isoc_ctl.transfer_buffer[i] =
 457                     kzalloc(sb_size, GFP_KERNEL);
 458                 if (!dev->vbi_mode.isoc_ctl.transfer_buffer[i]) {
 459                         cx231xx_err(DRIVER_NAME
 460                                     ": unable to allocate %i bytes for transfer"
 461                                     " buffer %i%s\n", sb_size, i,
 462                                     in_interrupt() ? " while in int" : "");
 463                         cx231xx_uninit_vbi_isoc(dev);
 464                         return -ENOMEM;
 465                 }
 466
 467                 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr);
 468                 usb_fill_bulk_urb(urb, dev->udev, pipe,
 469                                   dev->vbi_mode.isoc_ctl.transfer_buffer[i],
 470                                   sb_size, cx231xx_irq_vbi_callback, dma_q);
 471         }
 472
 473         init_waitqueue_head(&dma_q->wq);
 474
 475         /* submit urbs and enables IRQ */
 476         for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
 477                 rc = usb_submit_urb(dev->vbi_mode.isoc_ctl.urb[i], GFP_ATOMIC);
 478                 if (rc) {
 479                         cx231xx_err(DRIVER_NAME
 480                                     ": submit of urb %i failed (error=%i)\n", i,
 481                                     rc);
 482                         cx231xx_uninit_vbi_isoc(dev);
 483                         return rc;
 484                 }
 485         }
 486
 487         cx231xx_capture_start(dev, 1, Vbi);
 488
 489         return 0;
 490 }
 491 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc);
 492
 493 u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
 494                          u8 sav_eav, u8 *p_buffer, u32 buffer_size)
 495 {
 496         u32 bytes_copied = 0;
 497         int current_field = -1;
 498
 499         switch (sav_eav) {
 500
 501         case SAV_VBI_FIELD1:
 502                 current_field = 1;
 503                 break;
 504
 505         case SAV_VBI_FIELD2:
 506                 current_field = 2;
 507                 break;
 508         default:
 509                 break;
 510         }
 511
 512         if (current_field < 0)
 513                 return bytes_copied;
 514
 515         dma_q->last_sav = sav_eav;
 516
 517         bytes_copied =
 518             cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size,
 519                                   current_field);
 520
 521         return bytes_copied;
 522 }
 523
 524 /*
 525  * Announces that a buffer were filled and request the next
 526  */
 527 static inline void vbi_buffer_filled(struct cx231xx *dev,
 528                                      struct cx231xx_dmaqueue *dma_q,
 529                                      struct cx231xx_buffer *buf)
 530 {
 531         /* Advice that buffer was filled */
 532         /* cx231xx_info(DRIVER_NAME "[%p/%d] wakeup\n", buf, buf->vb.i); */
 533
 534         buf->vb.state = VIDEOBUF_DONE;
 535         buf->vb.field_count++;
 536         do_gettimeofday(&buf->vb.ts);
 537
 538         dev->vbi_mode.isoc_ctl.buf = NULL;
 539
 540         list_del(&buf->vb.queue);
 541         wake_up(&buf->vb.done);
 542 }
 543
 544 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
 545                           u8 *p_line, u32 length, int field_number)
 546 {
 547         u32 bytes_to_copy;
 548         struct cx231xx_buffer *buf;
 549         u32 _line_size = dev->width * 2;
 550
 551         if (dma_q->current_field != field_number)
 552                 cx231xx_reset_vbi_buffer(dev, dma_q);
 553
 554         /* get the buffer pointer */
 555         buf = dev->vbi_mode.isoc_ctl.buf;
 556
 557         /* Remember the field number for next time */
 558         dma_q->current_field = field_number;
 559
 560         bytes_to_copy = dma_q->bytes_left_in_line;
 561         if (bytes_to_copy > length)
 562                 bytes_to_copy = length;
 563
 564         if (dma_q->lines_completed >= dma_q->lines_per_field) {
 565                 dma_q->bytes_left_in_line -= bytes_to_copy;
 566                 dma_q->is_partial_line =
 567                     (dma_q->bytes_left_in_line == 0) ? 0 : 1;
 568                 return 0;
 569         }
 570
 571         dma_q->is_partial_line = 1;
 572
 573         /* If we don't have a buffer, just return the number of bytes we would
 574            have copied if we had a buffer. */
 575         if (!buf) {
 576                 dma_q->bytes_left_in_line -= bytes_to_copy;
 577                 dma_q->is_partial_line =
 578                     (dma_q->bytes_left_in_line == 0) ? 0 : 1;
 579                 return bytes_to_copy;
 580         }
 581
 582         /* copy the data to video buffer */
 583         cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy);
 584
 585         dma_q->pos += bytes_to_copy;
 586         dma_q->bytes_left_in_line -= bytes_to_copy;
 587
 588         if (dma_q->bytes_left_in_line == 0) {
 589
 590                 dma_q->bytes_left_in_line = _line_size;
 591                 dma_q->lines_completed++;
 592                 dma_q->is_partial_line = 0;
 593
 594                 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) {
 595
 596                         vbi_buffer_filled(dev, dma_q, buf);
 597
 598                         dma_q->pos = 0;
 599                         buf = NULL;
 600                         dma_q->lines_completed = 0;
 601                 }
 602         }
 603
 604         return bytes_to_copy;
 605 }
 606
 607 /*
 608  * video-buf generic routine to get the next available buffer
 609  */
 610 static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q,
 611                                     struct cx231xx_buffer **buf)
 612 {
 613         struct cx231xx_video_mode *vmode =
 614             container_of(dma_q, struct cx231xx_video_mode, vidq);
 615         struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
 616         char *outp;
 617
 618         if (list_empty(&dma_q->active)) {
 619                 cx231xx_err(DRIVER_NAME ": No active queue to serve\n");
 620                 dev->vbi_mode.isoc_ctl.buf = NULL;
 621                 *buf = NULL;
 622                 return;
 623         }
 624
 625         /* Get the next buffer */
 626         *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue);
 627
 628         /* Cleans up buffer - Usefull for testing for frame/URB loss */
 629         outp = videobuf_to_vmalloc(&(*buf)->vb);
 630         memset(outp, 0, (*buf)->vb.size);
 631
 632         dev->vbi_mode.isoc_ctl.buf = *buf;
 633
 634         return;
 635 }
 636
 637 void cx231xx_reset_vbi_buffer(struct cx231xx *dev,
 638                               struct cx231xx_dmaqueue *dma_q)
 639 {
 640         struct cx231xx_buffer *buf;
 641
 642         buf = dev->vbi_mode.isoc_ctl.buf;
 643
 644         if (buf == NULL) {
 645                 /* first try to get the buffer */
 646                 get_next_vbi_buf(dma_q, &buf);
 647
 648                 dma_q->pos = 0;
 649                 dma_q->current_field = -1;
 650         }
 651
 652         dma_q->bytes_left_in_line = dev->width << 1;
 653         dma_q->lines_completed = 0;
 654 }
 655
 656 int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
 657                         u8 *p_buffer, u32 bytes_to_copy)
 658 {
 659         u8 *p_out_buffer = NULL;
 660         u32 current_line_bytes_copied = 0;
 661         struct cx231xx_buffer *buf;
 662         u32 _line_size = dev->width << 1;
 663         void *startwrite;
 664         int offset, lencopy;
 665
 666         buf = dev->vbi_mode.isoc_ctl.buf;
 667
 668         if (buf == NULL)
 669                 return -EINVAL;
 670
 671         p_out_buffer = videobuf_to_vmalloc(&buf->vb);
 672
 673         if (dma_q->bytes_left_in_line != _line_size) {
 674                 current_line_bytes_copied =
 675                     _line_size - dma_q->bytes_left_in_line;
 676         }
 677
 678         offset = (dma_q->lines_completed * _line_size) +
 679                  current_line_bytes_copied;
 680
 681         /* prepare destination address */
 682         startwrite = p_out_buffer + offset;
 683
 684         lencopy = dma_q->bytes_left_in_line > bytes_to_copy ?
 685                   bytes_to_copy : dma_q->bytes_left_in_line;
 686
 687         memcpy(startwrite, p_buffer, lencopy);
 688
 689         return 0;
 690 }
 691
 692 u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev,
 693                               struct cx231xx_dmaqueue *dma_q)
 694 {
 695         u32 height = 0;
 696
 697         height = ((dev->norm & V4L2_STD_625_50) ?
 698                   PAL_VBI_LINES : NTSC_VBI_LINES);
 699         return (dma_q->lines_completed == height) ? 1 : 0;
 700 }