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                 bytes_parsed = 0;
 113
 114                 if (dma_q->is_partial_line) {
 115                         /* Handle the case where we were working on a partial
 116                            line */
 117                         sav_eav = dma_q->last_sav;
 118                 } else {
 119                         /* Check for a SAV/EAV overlapping the
 120                            buffer boundary */
 121
 122                         sav_eav = cx231xx_find_boundary_SAV_EAV(p_buffer,
 123                                                           dma_q->partial_buf,
 124                                                           &bytes_parsed);
 125                 }
 126
 127                 sav_eav &= 0xF0;
 128                 /* Get the first line if we have some portion of an SAV/EAV from
 129                    the last buffer or a partial line */
 130                 if (sav_eav) {
 131                         bytes_parsed += cx231xx_get_vbi_line(dev, dma_q,
 132                                 sav_eav,                       /* SAV/EAV */
 133                                 p_buffer + bytes_parsed,       /* p_buffer */
 134                                 buffer_size - bytes_parsed);   /* buffer size */
 135                 }
 136
 137                 /* Now parse data that is completely in this buffer */
 138                 dma_q->is_partial_line = 0;
 139
 140                 while (bytes_parsed < buffer_size) {
 141                         u32 bytes_used = 0;
 142
 143                         sav_eav = cx231xx_find_next_SAV_EAV(
 144                                 p_buffer + bytes_parsed,        /* p_buffer */
 145                                 buffer_size - bytes_parsed, /* buffer size */
 146                                 &bytes_used);   /* bytes used to get SAV/EAV */
 147
 148                         bytes_parsed += bytes_used;
 149
 150                         sav_eav &= 0xF0;
 151                         if (sav_eav && (bytes_parsed < buffer_size)) {
 152                                 bytes_parsed += cx231xx_get_vbi_line(dev,
 153                                         dma_q, sav_eav, /* SAV/EAV */
 154                                         p_buffer+bytes_parsed, /* p_buffer */
 155                                         buffer_size-bytes_parsed);/*buf size*/
 156                         }
 157                 }
 158
 159                 /* Save the last four bytes of the buffer so we can
 160                 check the buffer boundary condition next time */
 161                 memcpy(dma_q->partial_buf, p_buffer + buffer_size - 4, 4);
 162                 bytes_parsed = 0;
 163         }
 164
 165         return rc;
 166 }
 167
 168 /* ------------------------------------------------------------------
 169         Vbi buf operations
 170    ------------------------------------------------------------------*/
 171
 172 static int
 173 vbi_buffer_setup(struct videobuf_queue *vq, unsigned int *count,
 174                  unsigned int *size)
 175 {
 176         struct cx231xx_fh *fh = vq->priv_data;
 177         struct cx231xx *dev = fh->dev;
 178         u32 height = 0;
 179
 180         height = ((dev->norm & V4L2_STD_625_50) ?
 181                   PAL_VBI_LINES : NTSC_VBI_LINES);
 182
 183         *size = (dev->width * height * 2);
 184         if (0 == *count)
 185                 *count = CX231XX_DEF_VBI_BUF;
 186
 187         if (*count < CX231XX_MIN_BUF)
 188                 *count = CX231XX_MIN_BUF;
 189
 190         /* call VBI setup if required */
 191         /* cx231xx_i2c_call_clients(&dev->i2c_bus[1], VIDIOC_S_FREQUENCY, &f);
 192          */
 193
 194         return 0;
 195 }
 196
 197 /* This is called *without* dev->slock held; please keep it that way */
 198 static void free_buffer(struct videobuf_queue *vq, struct cx231xx_buffer *buf)
 199 {
 200         struct cx231xx_fh *fh = vq->priv_data;
 201         struct cx231xx *dev = fh->dev;
 202         unsigned long flags = 0;
 203         if (in_interrupt())
 204                 BUG();
 205
 206         /* We used to wait for the buffer to finish here, but this didn't work
 207            because, as we were keeping the state as VIDEOBUF_QUEUED,
 208            videobuf_queue_cancel marked it as finished for us.
 209            (Also, it could wedge forever if the hardware was misconfigured.)
 210
 211            This should be safe; by the time we get here, the buffer isn't
 212            queued anymore. If we ever start marking the buffers as
 213            VIDEOBUF_ACTIVE, it won't be, though.
 214          */
 215         spin_lock_irqsave(&dev->vbi_mode.slock, flags);
 216         if (dev->vbi_mode.isoc_ctl.buf == buf)
 217                 dev->vbi_mode.isoc_ctl.buf = NULL;
 218         spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
 219
 220         videobuf_vmalloc_free(&buf->vb);
 221         buf->vb.state = VIDEOBUF_NEEDS_INIT;
 222 }
 223
 224 static int
 225 vbi_buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
 226                    enum v4l2_field field)
 227 {
 228         struct cx231xx_fh *fh = vq->priv_data;
 229         struct cx231xx_buffer *buf =
 230             container_of(vb, struct cx231xx_buffer, vb);
 231         struct cx231xx *dev = fh->dev;
 232         int rc = 0, urb_init = 0;
 233         u32 height = 0;
 234
 235         height = ((dev->norm & V4L2_STD_625_50) ?
 236                   PAL_VBI_LINES : NTSC_VBI_LINES);
 237         buf->vb.size = ((dev->width << 1) * height);
 238
 239         if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
 240                 return -EINVAL;
 241
 242         buf->vb.width = dev->width;
 243         buf->vb.height = height;
 244         buf->vb.field = field;
 245         buf->vb.field = V4L2_FIELD_SEQ_TB;
 246
 247         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
 248                 rc = videobuf_iolock(vq, &buf->vb, NULL);
 249                 if (rc < 0)
 250                         goto fail;
 251         }
 252
 253         if (!dev->vbi_mode.isoc_ctl.num_bufs)
 254                 urb_init = 1;
 255
 256         if (urb_init) {
 257                 rc = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS,
 258                                            CX231XX_NUM_VBI_BUFS,
 259                                            dev->vbi_mode.alt_max_pkt_size[0],
 260                                            cx231xx_isoc_vbi_copy);
 261                 if (rc < 0)
 262                         goto fail;
 263         }
 264
 265         buf->vb.state = VIDEOBUF_PREPARED;
 266         return 0;
 267
 268 fail:
 269         free_buffer(vq, buf);
 270         return rc;
 271 }
 272
 273 static void
 274 vbi_buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 275 {
 276         struct cx231xx_buffer *buf =
 277             container_of(vb, struct cx231xx_buffer, vb);
 278         struct cx231xx_fh *fh = vq->priv_data;
 279         struct cx231xx *dev = fh->dev;
 280         struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
 281
 282         buf->vb.state = VIDEOBUF_QUEUED;
 283         list_add_tail(&buf->vb.queue, &vidq->active);
 284
 285 }
 286
 287 static void vbi_buffer_release(struct videobuf_queue *vq,
 288                                struct videobuf_buffer *vb)
 289 {
 290         struct cx231xx_buffer *buf =
 291             container_of(vb, struct cx231xx_buffer, vb);
 292
 293
 294         free_buffer(vq, buf);
 295 }
 296
 297 struct videobuf_queue_ops cx231xx_vbi_qops = {
 298         .buf_setup   = vbi_buffer_setup,
 299         .buf_prepare = vbi_buffer_prepare,
 300         .buf_queue   = vbi_buffer_queue,
 301         .buf_release = vbi_buffer_release,
 302 };
 303
 304 /* ------------------------------------------------------------------
 305         URB control
 306    ------------------------------------------------------------------*/
 307
 308 /*
 309  * IRQ callback, called by URB callback
 310  */
 311 static void cx231xx_irq_vbi_callback(struct urb *urb)
 312 {
 313         struct cx231xx_dmaqueue *dma_q = urb->context;
 314         struct cx231xx_video_mode *vmode =
 315             container_of(dma_q, struct cx231xx_video_mode, vidq);
 316         struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
 317         int rc;
 318
 319         switch (urb->status) {
 320         case 0:         /* success */
 321         case -ETIMEDOUT:        /* NAK */
 322                 break;
 323         case -ECONNRESET:       /* kill */
 324         case -ENOENT:
 325         case -ESHUTDOWN:
 326                 return;
 327         default:                /* error */
 328                 cx231xx_err(DRIVER_NAME "urb completition error %d.\n",
 329                             urb->status);
 330                 break;
 331         }
 332
 333         /* Copy data from URB */
 334         spin_lock(&dev->vbi_mode.slock);
 335         rc = dev->vbi_mode.isoc_ctl.isoc_copy(dev, urb);
 336         spin_unlock(&dev->vbi_mode.slock);
 337
 338         /* Reset status */
 339         urb->status = 0;
 340
 341         urb->status = usb_submit_urb(urb, GFP_ATOMIC);
 342         if (urb->status) {
 343                 cx231xx_err(DRIVER_NAME "urb resubmit failed (error=%i)\n",
 344                             urb->status);
 345         }
 346 }
 347
 348 /*
 349  * Stop and Deallocate URBs
 350  */
 351 void cx231xx_uninit_vbi_isoc(struct cx231xx *dev)
 352 {
 353         struct urb *urb;
 354         int i;
 355
 356         cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_uninit_vbi_isoc\n");
 357
 358         dev->vbi_mode.isoc_ctl.nfields = -1;
 359         for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
 360                 urb = dev->vbi_mode.isoc_ctl.urb[i];
 361                 if (urb) {
 362                         if (!irqs_disabled())
 363                                 usb_kill_urb(urb);
 364                         else
 365                                 usb_unlink_urb(urb);
 366
 367                         if (dev->vbi_mode.isoc_ctl.transfer_buffer[i]) {
 368
 369                                 kfree(dev->vbi_mode.isoc_ctl.
 370                                       transfer_buffer[i]);
 371                                 dev->vbi_mode.isoc_ctl.transfer_buffer[i] =
 372                                     NULL;
 373                         }
 374                         usb_free_urb(urb);
 375                         dev->vbi_mode.isoc_ctl.urb[i] = NULL;
 376                 }
 377                 dev->vbi_mode.isoc_ctl.transfer_buffer[i] = NULL;
 378         }
 379
 380         kfree(dev->vbi_mode.isoc_ctl.urb);
 381         kfree(dev->vbi_mode.isoc_ctl.transfer_buffer);
 382
 383         dev->vbi_mode.isoc_ctl.urb = NULL;
 384         dev->vbi_mode.isoc_ctl.transfer_buffer = NULL;
 385         dev->vbi_mode.isoc_ctl.num_bufs = 0;
 386
 387         cx231xx_capture_start(dev, 0, Vbi);
 388 }
 389 EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc);
 390
 391 /*
 392  * Allocate URBs and start IRQ
 393  */
 394 int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets,
 395                           int num_bufs, int max_pkt_size,
 396                           int (*isoc_copy) (struct cx231xx *dev,
 397                                             struct urb *urb))
 398 {
 399         struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq;
 400         int i;
 401         int sb_size, pipe;
 402         struct urb *urb;
 403         int rc;
 404
 405         cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_prepare_isoc\n");
 406
 407         /* De-allocates all pending stuff */
 408         cx231xx_uninit_vbi_isoc(dev);
 409
 410         /* clear if any halt */
 411         usb_clear_halt(dev->udev,
 412                        usb_rcvbulkpipe(dev->udev,
 413                                        dev->vbi_mode.end_point_addr));
 414
 415         dev->vbi_mode.isoc_ctl.isoc_copy = isoc_copy;
 416         dev->vbi_mode.isoc_ctl.num_bufs = num_bufs;
 417         dma_q->pos = 0;
 418         dma_q->is_partial_line = 0;
 419         dma_q->last_sav = 0;
 420         dma_q->current_field = -1;
 421         dma_q->bytes_left_in_line = dev->width << 1;
 422         dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ?
 423                                   PAL_VBI_LINES : NTSC_VBI_LINES);
 424         dma_q->lines_completed = 0;
 425         for (i = 0; i < 8; i++)
 426                 dma_q->partial_buf[i] = 0;
 427
 428         dev->vbi_mode.isoc_ctl.urb = kzalloc(sizeof(void *) * num_bufs,
 429                                              GFP_KERNEL);
 430         if (!dev->vbi_mode.isoc_ctl.urb) {
 431                 cx231xx_errdev("cannot alloc memory for usb buffers\n");
 432                 return -ENOMEM;
 433         }
 434
 435         dev->vbi_mode.isoc_ctl.transfer_buffer =
 436             kzalloc(sizeof(void *) * num_bufs, GFP_KERNEL);
 437         if (!dev->vbi_mode.isoc_ctl.transfer_buffer) {
 438                 cx231xx_errdev("cannot allocate memory for usbtransfer\n");
 439                 kfree(dev->vbi_mode.isoc_ctl.urb);
 440                 return -ENOMEM;
 441         }
 442
 443         dev->vbi_mode.isoc_ctl.max_pkt_size = max_pkt_size;
 444         dev->vbi_mode.isoc_ctl.buf = NULL;
 445
 446         sb_size = max_packets * dev->vbi_mode.isoc_ctl.max_pkt_size;
 447
 448         /* allocate urbs and transfer buffers */
 449         for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
 450
 451                 urb = usb_alloc_urb(0, GFP_KERNEL);
 452                 if (!urb) {
 453                         cx231xx_err(DRIVER_NAME
 454                                     ": cannot alloc isoc_ctl.urb %i\n", i);
 455                         cx231xx_uninit_vbi_isoc(dev);
 456                         return -ENOMEM;
 457                 }
 458                 dev->vbi_mode.isoc_ctl.urb[i] = urb;
 459                 urb->transfer_flags = 0;
 460
 461                 dev->vbi_mode.isoc_ctl.transfer_buffer[i] =
 462                     kzalloc(sb_size, GFP_KERNEL);
 463                 if (!dev->vbi_mode.isoc_ctl.transfer_buffer[i]) {
 464                         cx231xx_err(DRIVER_NAME
 465                                     ": unable to allocate %i bytes for transfer"
 466                                     " buffer %i%s\n", sb_size, i,
 467                                     in_interrupt() ? " while in int" : "");
 468                         cx231xx_uninit_vbi_isoc(dev);
 469                         return -ENOMEM;
 470                 }
 471
 472                 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr);
 473                 usb_fill_bulk_urb(urb, dev->udev, pipe,
 474                                   dev->vbi_mode.isoc_ctl.transfer_buffer[i],
 475                                   sb_size, cx231xx_irq_vbi_callback, dma_q);
 476         }
 477
 478         init_waitqueue_head(&dma_q->wq);
 479
 480         /* submit urbs and enables IRQ */
 481         for (i = 0; i < dev->vbi_mode.isoc_ctl.num_bufs; i++) {
 482                 rc = usb_submit_urb(dev->vbi_mode.isoc_ctl.urb[i], GFP_ATOMIC);
 483                 if (rc) {
 484                         cx231xx_err(DRIVER_NAME
 485                                     ": submit of urb %i failed (error=%i)\n", i,
 486                                     rc);
 487                         cx231xx_uninit_vbi_isoc(dev);
 488                         return rc;
 489                 }
 490         }
 491
 492         cx231xx_capture_start(dev, 1, Vbi);
 493
 494         return 0;
 495 }
 496 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc);
 497
 498 u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
 499                          u8 sav_eav, u8 *p_buffer, u32 buffer_size)
 500 {
 501         u32 bytes_copied = 0;
 502         int current_field = -1;
 503
 504         switch (sav_eav) {
 505
 506         case SAV_VBI_FIELD1:
 507                 current_field = 1;
 508                 break;
 509
 510         case SAV_VBI_FIELD2:
 511                 current_field = 2;
 512                 break;
 513         default:
 514                 break;
 515         }
 516
 517         if (current_field < 0)
 518                 return bytes_copied;
 519
 520         dma_q->last_sav = sav_eav;
 521
 522         bytes_copied =
 523             cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size,
 524                                   current_field);
 525
 526         return bytes_copied;
 527 }
 528
 529 /*
 530  * Announces that a buffer were filled and request the next
 531  */
 532 static inline void vbi_buffer_filled(struct cx231xx *dev,
 533                                      struct cx231xx_dmaqueue *dma_q,
 534                                      struct cx231xx_buffer *buf)
 535 {
 536         /* Advice that buffer was filled */
 537         /* cx231xx_info(DRIVER_NAME "[%p/%d] wakeup\n", buf, buf->vb.i); */
 538
 539         buf->vb.state = VIDEOBUF_DONE;
 540         buf->vb.field_count++;
 541         do_gettimeofday(&buf->vb.ts);
 542
 543         dev->vbi_mode.isoc_ctl.buf = NULL;
 544
 545         list_del(&buf->vb.queue);
 546         wake_up(&buf->vb.done);
 547 }
 548
 549 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
 550                           u8 *p_line, u32 length, int field_number)
 551 {
 552         u32 bytes_to_copy;
 553         struct cx231xx_buffer *buf;
 554         u32 _line_size = dev->width * 2;
 555
 556         if (dma_q->current_field != field_number)
 557                 cx231xx_reset_vbi_buffer(dev, dma_q);
 558
 559         /* get the buffer pointer */
 560         buf = dev->vbi_mode.isoc_ctl.buf;
 561
 562         /* Remember the field number for next time */
 563         dma_q->current_field = field_number;
 564
 565         bytes_to_copy = dma_q->bytes_left_in_line;
 566         if (bytes_to_copy > length)
 567                 bytes_to_copy = length;
 568
 569         if (dma_q->lines_completed >= dma_q->lines_per_field) {
 570                 dma_q->bytes_left_in_line -= bytes_to_copy;
 571                 dma_q->is_partial_line =
 572                     (dma_q->bytes_left_in_line == 0) ? 0 : 1;
 573                 return 0;
 574         }
 575
 576         dma_q->is_partial_line = 1;
 577
 578         /* If we don't have a buffer, just return the number of bytes we would
 579            have copied if we had a buffer. */
 580         if (!buf) {
 581                 dma_q->bytes_left_in_line -= bytes_to_copy;
 582                 dma_q->is_partial_line =
 583                     (dma_q->bytes_left_in_line == 0) ? 0 : 1;
 584                 return bytes_to_copy;
 585         }
 586
 587         /* copy the data to video buffer */
 588         cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy);
 589
 590         dma_q->pos += bytes_to_copy;
 591         dma_q->bytes_left_in_line -= bytes_to_copy;
 592
 593         if (dma_q->bytes_left_in_line == 0) {
 594
 595                 dma_q->bytes_left_in_line = _line_size;
 596                 dma_q->lines_completed++;
 597                 dma_q->is_partial_line = 0;
 598
 599                 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) {
 600
 601                         vbi_buffer_filled(dev, dma_q, buf);
 602
 603                         dma_q->pos = 0;
 604                         buf = NULL;
 605                         dma_q->lines_completed = 0;
 606                 }
 607         }
 608
 609         return bytes_to_copy;
 610 }
 611
 612 /*
 613  * video-buf generic routine to get the next available buffer
 614  */
 615 static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q,
 616                                     struct cx231xx_buffer **buf)
 617 {
 618         struct cx231xx_video_mode *vmode =
 619             container_of(dma_q, struct cx231xx_video_mode, vidq);
 620         struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
 621         char *outp;
 622
 623         if (list_empty(&dma_q->active)) {
 624                 cx231xx_err(DRIVER_NAME ": No active queue to serve\n");
 625                 dev->vbi_mode.isoc_ctl.buf = NULL;
 626                 *buf = NULL;
 627                 return;
 628         }
 629
 630         /* Get the next buffer */
 631         *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue);
 632
 633         /* Cleans up buffer - Usefull for testing for frame/URB loss */
 634         outp = videobuf_to_vmalloc(&(*buf)->vb);
 635         memset(outp, 0, (*buf)->vb.size);
 636
 637         dev->vbi_mode.isoc_ctl.buf = *buf;
 638
 639         return;
 640 }
 641
 642 void cx231xx_reset_vbi_buffer(struct cx231xx *dev,
 643                               struct cx231xx_dmaqueue *dma_q)
 644 {
 645         struct cx231xx_buffer *buf;
 646
 647         buf = dev->vbi_mode.isoc_ctl.buf;
 648
 649         if (buf == NULL) {
 650                 /* first try to get the buffer */
 651                 get_next_vbi_buf(dma_q, &buf);
 652
 653                 dma_q->pos = 0;
 654                 dma_q->current_field = -1;
 655         }
 656
 657         dma_q->bytes_left_in_line = dev->width << 1;
 658         dma_q->lines_completed = 0;
 659 }
 660
 661 int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
 662                         u8 *p_buffer, u32 bytes_to_copy)
 663 {
 664         u8 *p_out_buffer = NULL;
 665         u32 current_line_bytes_copied = 0;
 666         struct cx231xx_buffer *buf;
 667         u32 _line_size = dev->width << 1;
 668         void *startwrite;
 669         int offset, lencopy;
 670
 671         buf = dev->vbi_mode.isoc_ctl.buf;
 672
 673         if (buf == NULL)
 674                 return -EINVAL;
 675
 676         p_out_buffer = videobuf_to_vmalloc(&buf->vb);
 677
 678         if (dma_q->bytes_left_in_line != _line_size) {
 679                 current_line_bytes_copied =
 680                     _line_size - dma_q->bytes_left_in_line;
 681         }
 682
 683         offset = (dma_q->lines_completed * _line_size) +
 684                  current_line_bytes_copied;
 685
 686         /* prepare destination address */
 687         startwrite = p_out_buffer + offset;
 688
 689         lencopy = dma_q->bytes_left_in_line > bytes_to_copy ?
 690                   bytes_to_copy : dma_q->bytes_left_in_line;
 691
 692         memcpy(startwrite, p_buffer, lencopy);
 693
 694         return 0;
 695 }
 696
 697 u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev,
 698                               struct cx231xx_dmaqueue *dma_q)
 699 {
 700         u32 height = 0;
 701
 702         height = ((dev->norm & V4L2_STD_625_50) ?
 703                   PAL_VBI_LINES : NTSC_VBI_LINES);
 704         return (dma_q->lines_completed == height) ? 1 : 0;
 705 }