SAFE public projects git trees. - safe/jmp/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/version.h>
  30 #include <linux/mm.h>
  31 #include <linux/mutex.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(DRIVER_NAME "URB status %d [%s].\n", status,
  74                             errmsg);
  75         } else {
  76                 cx231xx_err(DRIVER_NAME "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_buffer *buf;
  87         struct cx231xx_dmaqueue *dma_q = urb->context;
  88         int rc = 1;
  89         unsigned char *p_buffer;
  90         u32 bytes_parsed = 0, buffer_size = 0;
  91         u8 sav_eav = 0;
  92
  93         if (!dev)
  94                 return 0;
  95
  96         if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
  97                 return 0;
  98
  99         if (urb->status < 0) {
 100                 print_err_status(dev, -1, urb->status);
 101                 if (urb->status == -ENOENT)
 102                         return 0;
 103         }
 104
 105         buf = dev->vbi_mode.isoc_ctl.buf;
 106
 107         /* get buffer pointer and length */
 108         p_buffer = urb->transfer_buffer;
 109         buffer_size = urb->actual_length;
 110
 111         if (buffer_size > 0) {
 112
 113                 bytes_parsed = 0;
 114
 115                 if (dma_q->is_partial_line) {
 116                         /* Handle the case where we were working on a partial line */
 117                         sav_eav = dma_q->last_sav;
 118                 } else {
 119                         /* Check for a SAV/EAV overlapping the buffer boundary */
 120                         sav_eav =
 121                             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 the last buffer
 128                    or a partial line */
 129                 if (sav_eav) {
 130                         bytes_parsed += cx231xx_get_vbi_line(dev, dma_q, sav_eav,       /* SAV/EAV */
 131                                                              p_buffer + bytes_parsed,   /* p_buffer */
 132                                                              buffer_size - bytes_parsed);       /* buffer size */
 133                 }
 134
 135                 /* Now parse data that is completely in this buffer */
 136                 dma_q->is_partial_line = 0;
 137
 138                 while (bytes_parsed < buffer_size) {
 139                         u32 bytes_used = 0;
 140
 141                         sav_eav = cx231xx_find_next_SAV_EAV(p_buffer + bytes_parsed,    /* p_buffer */
 142                                                             buffer_size - bytes_parsed, /* buffer size */
 143                                                             &bytes_used);       /* Receives 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, dma_q, sav_eav,       /* SAV/EAV */
 150                                                                      p_buffer + bytes_parsed,   /* p_buffer */
 151                                                                      buffer_size - bytes_parsed);       /* buffer size */
 152                         }
 153                 }
 154
 155                 /* Save the last four bytes of the buffer so we can check the buffer boundary
 156                    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);
 180         if (0 == *count)
 181                 *count = CX231XX_DEF_VBI_BUF;
 182
 183         if (*count < CX231XX_MIN_BUF)
 184                 *count = CX231XX_MIN_BUF;
 185
 186         /* call VBI setup if required */
 187         /* cx231xx_i2c_call_clients(&dev->i2c_bus[1], VIDIOC_S_FREQUENCY, &f);
 188          */
 189
 190         return 0;
 191 }
 192
 193 /* This is called *without* dev->slock held; please keep it that way */
 194 static void free_buffer(struct videobuf_queue *vq, struct cx231xx_buffer *buf)
 195 {
 196         struct cx231xx_fh *fh = vq->priv_data;
 197         struct cx231xx *dev = fh->dev;
 198         unsigned long flags = 0;
 199         if (in_interrupt())
 200                 BUG();
 201
 202         /* We used to wait for the buffer to finish here, but this didn't work
 203            because, as we were keeping the state as VIDEOBUF_QUEUED,
 204            videobuf_queue_cancel marked it as finished for us.
 205            (Also, it could wedge forever if the hardware was misconfigured.)
 206
 207            This should be safe; by the time we get here, the buffer isn't
 208            queued anymore. If we ever start marking the buffers as
 209            VIDEOBUF_ACTIVE, it won't be, though.
 210          */
 211         spin_lock_irqsave(&dev->vbi_mode.slock, flags);
 212         if (dev->vbi_mode.isoc_ctl.buf == buf)
 213                 dev->vbi_mode.isoc_ctl.buf = NULL;
 214         spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
 215
 216         videobuf_vmalloc_free(&buf->vb);
 217         buf->vb.state = VIDEOBUF_NEEDS_INIT;
 218 }
 219
 220 static int
 221 vbi_buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
 222                    enum v4l2_field field)
 223 {
 224         struct cx231xx_fh *fh = vq->priv_data;
 225         struct cx231xx_buffer *buf =
 226             container_of(vb, struct cx231xx_buffer, vb);
 227         struct cx231xx *dev = fh->dev;
 228         int rc = 0, urb_init = 0;
 229         u32 height = 0;
 230
 231         height = ((dev->norm & V4L2_STD_625_50) ?
 232                   PAL_VBI_LINES : NTSC_VBI_LINES);
 233         buf->vb.size = ((dev->width << 1) * height);
 234
 235         if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
 236                 return -EINVAL;
 237
 238         buf->vb.width = dev->width;
 239         buf->vb.height = height;
 240         buf->vb.field = field;
 241         buf->vb.field = V4L2_FIELD_SEQ_TB;
 242
 243         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
 244                 rc = videobuf_iolock(vq, &buf->vb, NULL);
 245                 if (rc < 0)
 246                         goto fail;
 247         }
 248
 249         if (!dev->vbi_mode.isoc_ctl.num_bufs)
 250                 urb_init = 1;
 251
 252         if (urb_init) {
 253                 rc = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS,
 254                                            CX231XX_NUM_VBI_BUFS,
 255                                            dev->vbi_mode.alt_max_pkt_size[0],
 256                                            cx231xx_isoc_vbi_copy);
 257                 if (rc < 0)
 258                         goto fail;
 259         }
 260
 261         buf->vb.state = VIDEOBUF_PREPARED;
 262         return 0;
 263
 264       fail:
 265         free_buffer(vq, buf);
 266         return rc;
 267 }
 268
 269 static void
 270 vbi_buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 271 {
 272         struct cx231xx_buffer *buf =
 273             container_of(vb, struct cx231xx_buffer, vb);
 274         struct cx231xx_fh *fh = vq->priv_data;
 275         struct cx231xx *dev = fh->dev;
 276         struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
 277
 278         buf->vb.state = VIDEOBUF_QUEUED;
 279         list_add_tail(&buf->vb.queue, &vidq->active);
 280
 281 }
 282
 283 static void vbi_buffer_release(struct videobuf_queue *vq,
 284                                struct videobuf_buffer *vb)
 285 {
 286         struct cx231xx_buffer *buf =
 287             container_of(vb, struct cx231xx_buffer, vb);
 288         /*
 289            struct cx231xx_fh       *fh   = vq->priv_data;
 290            struct cx231xx          *dev  = (struct cx231xx *)fh->dev;
 291
 292            cx231xx_info(DRIVER_NAME "cx231xx: called vbi_buffer_release\n");
 293          */
 294
 295         free_buffer(vq, buf);
 296 }
 297
 298 struct videobuf_queue_ops cx231xx_vbi_qops = {
 299         .buf_setup = vbi_buffer_setup,
 300         .buf_prepare = vbi_buffer_prepare,
 301         .buf_queue = vbi_buffer_queue,
 302         .buf_release = vbi_buffer_release,
 303 };
 304
 305 /* ------------------------------------------------------------------
 306         URB control
 307    ------------------------------------------------------------------*/
 308
 309 /*
 310  * IRQ callback, called by URB callback
 311  */
 312 static void cx231xx_irq_vbi_callback(struct urb *urb)
 313 {
 314         struct cx231xx_dmaqueue *dma_q = urb->context;
 315         struct cx231xx_video_mode *vmode =
 316             container_of(dma_q, struct cx231xx_video_mode, vidq);
 317         struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
 318         int rc;
 319
 320         switch (urb->status) {
 321         case 0:         /* success */
 322         case -ETIMEDOUT:        /* NAK */
 323                 break;
 324         case -ECONNRESET:       /* kill */
 325         case -ENOENT:
 326         case -ESHUTDOWN:
 327                 return;
 328         default:                /* error */
 329                 cx231xx_err(DRIVER_NAME "urb completition error %d.\n",
 330                             urb->status);
 331                 break;
 332         }
 333
 334         /* Copy data from URB */
 335         spin_lock(&dev->vbi_mode.slock);
 336         rc = dev->vbi_mode.isoc_ctl.isoc_copy(dev, urb);
 337         spin_unlock(&dev->vbi_mode.slock);
 338
 339         /* Reset status */
 340         urb->status = 0;
 341
 342         urb->status = usb_submit_urb(urb, GFP_ATOMIC);
 343         if (urb->status) {
 344                 cx231xx_err(DRIVER_NAME "urb resubmit failed (error=%i)\n",
 345                             urb->status);
 346         }
 347 }
 348
 349 /*
 350  * Stop and Deallocate URBs
 351  */
 352 void cx231xx_uninit_vbi_isoc(struct cx231xx *dev)
 353 {
 354         struct urb *urb;
 355         int i;
 356
 357         cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_uninit_vbi_isoc\n");
 358
 359         dev->vbi_mode.isoc_ctl.nfields = -1;
 360         for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
 361                 urb = dev->vbi_mode.isoc_ctl.urb[i];
 362                 if (urb) {
 363                         if (!irqs_disabled())
 364                                 usb_kill_urb(urb);
 365                         else
 366                                 usb_unlink_urb(urb);
 367
 368                         if (dev->vbi_mode.isoc_ctl.transfer_buffer[i]) {
 369
 370                                 kfree(dev->vbi_mode.isoc_ctl.
 371                                       transfer_buffer[i]);
 372                                 dev->vbi_mode.isoc_ctl.transfer_buffer[i] =
 373                                     NULL;
 374                         }
 375                         usb_free_urb(urb);
 376                         dev->vbi_mode.isoc_ctl.urb[i] = NULL;
 377                 }
 378                 dev->vbi_mode.isoc_ctl.transfer_buffer[i] = NULL;
 379         }
 380
 381         kfree(dev->vbi_mode.isoc_ctl.urb);
 382         kfree(dev->vbi_mode.isoc_ctl.transfer_buffer);
 383
 384         dev->vbi_mode.isoc_ctl.urb = NULL;
 385         dev->vbi_mode.isoc_ctl.transfer_buffer = NULL;
 386         dev->vbi_mode.isoc_ctl.num_bufs = 0;
 387
 388         cx231xx_capture_start(dev, 0, Vbi);
 389 }
 390
 391 EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc);
 392
 393 /*
 394  * Allocate URBs and start IRQ
 395  */
 396 int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets,
 397                           int num_bufs, int max_pkt_size,
 398                           int (*isoc_copy) (struct cx231xx * dev,
 399                                             struct urb * urb))
 400 {
 401         struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq;
 402         int i;
 403         int sb_size, pipe;
 404         struct urb *urb;
 405         int rc;
 406
 407         cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_prepare_isoc\n");
 408
 409         /* De-allocates all pending stuff */
 410         cx231xx_uninit_vbi_isoc(dev);
 411
 412         /* clear if any halt */
 413         usb_clear_halt(dev->udev,
 414                        usb_rcvbulkpipe(dev->udev,
 415                                        dev->vbi_mode.end_point_addr));
 416
 417         dev->vbi_mode.isoc_ctl.isoc_copy = isoc_copy;
 418         dev->vbi_mode.isoc_ctl.num_bufs = num_bufs;
 419         dma_q->pos = 0;
 420         dma_q->is_partial_line = 0;
 421         dma_q->last_sav = 0;
 422         dma_q->current_field = -1;
 423         dma_q->bytes_left_in_line = dev->width << 1;
 424         dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ?
 425                                   PAL_VBI_LINES : NTSC_VBI_LINES);
 426         dma_q->lines_completed = 0;
 427         for (i = 0; i < 8; i++)
 428                 dma_q->partial_buf[i] = 0;
 429
 430         dev->vbi_mode.isoc_ctl.urb =
 431             kzalloc(sizeof(void *) * num_bufs, GFP_KERNEL);
 432         if (!dev->vbi_mode.isoc_ctl.urb) {
 433                 cx231xx_errdev("cannot alloc memory for usb buffers\n");
 434                 return -ENOMEM;
 435         }
 436
 437         dev->vbi_mode.isoc_ctl.transfer_buffer =
 438             kzalloc(sizeof(void *) * num_bufs, GFP_KERNEL);
 439         if (!dev->vbi_mode.isoc_ctl.transfer_buffer) {
 440                 cx231xx_errdev("cannot allocate memory for usbtransfer\n");
 441                 kfree(dev->vbi_mode.isoc_ctl.urb);
 442                 return -ENOMEM;
 443         }
 444
 445         dev->vbi_mode.isoc_ctl.max_pkt_size = max_pkt_size;
 446         dev->vbi_mode.isoc_ctl.buf = NULL;
 447
 448         sb_size = max_packets * dev->vbi_mode.isoc_ctl.max_pkt_size;
 449
 450         /* allocate urbs and transfer buffers */
 451         for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
 452
 453                 urb = usb_alloc_urb(0, GFP_KERNEL);
 454                 if (!urb) {
 455                         cx231xx_err(DRIVER_NAME
 456                                     ": cannot alloc isoc_ctl.urb %i\n", i);
 457                         cx231xx_uninit_vbi_isoc(dev);
 458                         return -ENOMEM;
 459                 }
 460                 dev->vbi_mode.isoc_ctl.urb[i] = urb;
 461                 urb->transfer_flags = 0;
 462
 463                 dev->vbi_mode.isoc_ctl.transfer_buffer[i] =
 464                     kzalloc(sb_size, GFP_KERNEL);
 465                 if (!dev->vbi_mode.isoc_ctl.transfer_buffer[i]) {
 466                         cx231xx_err(DRIVER_NAME
 467                                     ": unable to allocate %i bytes for transfer"
 468                                     " buffer %i%s\n", sb_size, i,
 469                                     in_interrupt()? " while in int" : "");
 470                         cx231xx_uninit_vbi_isoc(dev);
 471                         return -ENOMEM;
 472                 }
 473
 474                 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr);
 475                 usb_fill_bulk_urb(urb, dev->udev, pipe,
 476                                   dev->vbi_mode.isoc_ctl.transfer_buffer[i],
 477                                   sb_size, cx231xx_irq_vbi_callback, dma_q);
 478         }
 479
 480         init_waitqueue_head(&dma_q->wq);
 481
 482         /* submit urbs and enables IRQ */
 483         for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
 484                 rc = usb_submit_urb(dev->vbi_mode.isoc_ctl.urb[i], GFP_ATOMIC);
 485                 if (rc) {
 486                         cx231xx_err(DRIVER_NAME
 487                                     ": submit of urb %i failed (error=%i)\n", i,
 488                                     rc);
 489                         cx231xx_uninit_vbi_isoc(dev);
 490                         return rc;
 491                 }
 492         }
 493
 494         cx231xx_capture_start(dev, 1, Vbi);
 495
 496         return 0;
 497 }
 498
 499 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc);
 500
 501 u32 cx231xx_get_vbi_line(struct cx231xx * dev, struct cx231xx_dmaqueue * dma_q,
 502                          u8 sav_eav, u8 * p_buffer, u32 buffer_size)
 503 {
 504         u32 bytes_copied = 0;
 505         int current_field = -1;
 506
 507         switch (sav_eav) {
 508
 509         case SAV_VBI_FIELD1:
 510                 current_field = 1;
 511                 break;
 512
 513         case SAV_VBI_FIELD2:
 514                 current_field = 2;
 515                 break;
 516         default:
 517                 break;
 518         }
 519
 520         if (current_field < 0)
 521                 return bytes_copied;
 522
 523         dma_q->last_sav = sav_eav;
 524
 525         bytes_copied =
 526             cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size,
 527                                   current_field);
 528
 529         return bytes_copied;
 530 }
 531
 532 /*
 533  * Announces that a buffer were filled and request the next
 534  */
 535 static inline void vbi_buffer_filled(struct cx231xx *dev,
 536                                      struct cx231xx_dmaqueue *dma_q,
 537                                      struct cx231xx_buffer *buf)
 538 {
 539         /* Advice that buffer was filled */
 540         /* cx231xx_info(DRIVER_NAME "[%p/%d] wakeup\n", buf, buf->vb.i); */
 541
 542         buf->vb.state = VIDEOBUF_DONE;
 543         buf->vb.field_count++;
 544         do_gettimeofday(&buf->vb.ts);
 545
 546         dev->vbi_mode.isoc_ctl.buf = NULL;
 547
 548         list_del(&buf->vb.queue);
 549         wake_up(&buf->vb.done);
 550 }
 551
 552 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
 553                           u8 * p_line, u32 length, int field_number)
 554 {
 555         u32 bytes_to_copy;
 556         struct cx231xx_buffer *buf;
 557         u32 _line_size = dev->width * 2;
 558
 559         if (dma_q->current_field != field_number) {
 560                 cx231xx_reset_vbi_buffer(dev, dma_q);
 561         }
 562
 563         /* get the buffer pointer */
 564         buf = dev->vbi_mode.isoc_ctl.buf;
 565
 566         /* Remember the field number for next time */
 567         dma_q->current_field = field_number;
 568
 569         bytes_to_copy = dma_q->bytes_left_in_line;
 570         if (bytes_to_copy > length)
 571                 bytes_to_copy = length;
 572
 573         if (dma_q->lines_completed >= dma_q->lines_per_field) {
 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 0;
 578         }
 579
 580         dma_q->is_partial_line = 1;
 581
 582         /* If we don't have a buffer, just return the number of bytes we would
 583            have copied if we had a buffer. */
 584         if (!buf) {
 585                 dma_q->bytes_left_in_line -= bytes_to_copy;
 586                 dma_q->is_partial_line =
 587                     (dma_q->bytes_left_in_line == 0) ? 0 : 1;
 588                 return bytes_to_copy;
 589         }
 590
 591         /* copy the data to video buffer */
 592         cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy);
 593
 594         dma_q->pos += bytes_to_copy;
 595         dma_q->bytes_left_in_line -= bytes_to_copy;
 596
 597         if (dma_q->bytes_left_in_line == 0) {
 598
 599                 dma_q->bytes_left_in_line = _line_size;
 600                 dma_q->lines_completed++;
 601                 dma_q->is_partial_line = 0;
 602
 603                 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) {
 604
 605                         vbi_buffer_filled(dev, dma_q, buf);
 606
 607                         dma_q->pos = 0;
 608                         buf = NULL;
 609                         dma_q->lines_completed = 0;
 610                 }
 611         }
 612
 613         return bytes_to_copy;
 614 }
 615
 616 /*
 617  * video-buf generic routine to get the next available buffer
 618  */
 619 static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q,
 620                                     struct cx231xx_buffer **buf)
 621 {
 622         struct cx231xx_video_mode *vmode =
 623             container_of(dma_q, struct cx231xx_video_mode, vidq);
 624         struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
 625         char *outp;
 626
 627         if (list_empty(&dma_q->active)) {
 628                 cx231xx_err(DRIVER_NAME ": No active queue to serve\n");
 629                 dev->vbi_mode.isoc_ctl.buf = NULL;
 630                 *buf = NULL;
 631                 return;
 632         }
 633
 634         /* Get the next buffer */
 635         *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue);
 636
 637         /* Cleans up buffer - Usefull for testing for frame/URB loss */
 638         outp = videobuf_to_vmalloc(&(*buf)->vb);
 639         memset(outp, 0, (*buf)->vb.size);
 640
 641         dev->vbi_mode.isoc_ctl.buf = *buf;
 642
 643         return;
 644 }
 645
 646 void cx231xx_reset_vbi_buffer(struct cx231xx *dev,
 647                               struct cx231xx_dmaqueue *dma_q)
 648 {
 649         struct cx231xx_buffer *buf;
 650
 651         buf = dev->vbi_mode.isoc_ctl.buf;
 652
 653         if (buf == NULL) {
 654
 655                 /* first try to get the buffer */
 656                 get_next_vbi_buf(dma_q, &buf);
 657
 658                 dma_q->pos = 0;
 659                 dma_q->current_field = -1;
 660         }
 661
 662         dma_q->bytes_left_in_line = dev->width << 1;
 663         dma_q->lines_completed = 0;
 664 }
 665
 666 int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
 667                         u8 * p_buffer, u32 bytes_to_copy)
 668 {
 669         u8 *p_out_buffer = NULL;
 670         u32 current_line_bytes_copied = 0;
 671         struct cx231xx_buffer *buf;
 672         u32 _line_size = dev->width << 1;
 673         void *startwrite;
 674         int offset, lencopy;
 675
 676         buf = dev->vbi_mode.isoc_ctl.buf;
 677
 678         if (buf == NULL) {
 679                 return -1;
 680         }
 681
 682         p_out_buffer = videobuf_to_vmalloc(&buf->vb);
 683
 684         if (dma_q->bytes_left_in_line != _line_size) {
 685                 current_line_bytes_copied =
 686                     _line_size - dma_q->bytes_left_in_line;
 687         }
 688
 689         offset =
 690             (dma_q->lines_completed * _line_size) + current_line_bytes_copied;
 691
 692         /* prepare destination address */
 693         startwrite = p_out_buffer + offset;
 694
 695         lencopy =
 696             dma_q->bytes_left_in_line >
 697             bytes_to_copy ? bytes_to_copy : dma_q->bytes_left_in_line;
 698
 699         memcpy(startwrite, p_buffer, lencopy);
 700
 701         return 0;
 702 }
 703
 704 u8 cx231xx_is_vbi_buffer_done(struct cx231xx * dev,
 705                               struct cx231xx_dmaqueue * dma_q)
 706 {
 707         u32 height = 0;
 708
 709         height = ((dev->norm & V4L2_STD_625_50) ?
 710                   PAL_VBI_LINES : NTSC_VBI_LINES);
 711         return (dma_q->lines_completed == height) ? 1 : 0;
 712 }