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