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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3    cx231xx_vbi.c - driver for Conexant Cx23100/101/102 USB video capture devices
   4
   5    Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
   6         Based on cx88 driver
   7
   8  */
   9
  10 #include "cx231xx.h"
  11 #include <linux/init.h>
  12 #include <linux/list.h>
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/bitmap.h>
  16 #include <linux/i2c.h>
  17 #include <linux/mm.h>
  18 #include <linux/mutex.h>
  19 #include <linux/slab.h>
  20
  21 #include <media/v4l2-common.h>
  22 #include <media/v4l2-ioctl.h>
  23 #include <media/drv-intf/msp3400.h>
  24 #include <media/tuner.h>
  25
  26 #include "cx231xx-vbi.h"
  27
  28 static inline void print_err_status(struct cx231xx *dev, int packet, int status)
  29 {
  30         char *errmsg = "Unknown";
  31
  32         switch (status) {
  33         case -ENOENT:
  34                 errmsg = "unlinked synchronously";
  35                 break;
  36         case -ECONNRESET:
  37                 errmsg = "unlinked asynchronously";
  38                 break;
  39         case -ENOSR:
  40                 errmsg = "Buffer error (overrun)";
  41                 break;
  42         case -EPIPE:
  43                 errmsg = "Stalled (device not responding)";
  44                 break;
  45         case -EOVERFLOW:
  46                 errmsg = "Babble (bad cable?)";
  47                 break;
  48         case -EPROTO:
  49                 errmsg = "Bit-stuff error (bad cable?)";
  50                 break;
  51         case -EILSEQ:
  52                 errmsg = "CRC/Timeout (could be anything)";
  53                 break;
  54         case -ETIME:
  55                 errmsg = "Device does not respond";
  56                 break;
  57         }
  58         if (packet < 0) {
  59                 dev_err(dev->dev,
  60                         "URB status %d [%s].\n", status, errmsg);
  61         } else {
  62                 dev_err(dev->dev,
  63                         "URB packet %d, status %d [%s].\n",
  64                         packet, status, errmsg);
  65         }
  66 }
  67
  68 /*
  69  * Controls the isoc copy of each urb packet
  70  */
  71 static inline int cx231xx_isoc_vbi_copy(struct cx231xx *dev, struct urb *urb)
  72 {
  73         struct cx231xx_dmaqueue *dma_q = urb->context;
  74         int rc = 1;
  75         unsigned char *p_buffer;
  76         u32 bytes_parsed = 0, buffer_size = 0;
  77         u8 sav_eav = 0;
  78
  79         if (!dev)
  80                 return 0;
  81
  82         if (dev->state & DEV_DISCONNECTED)
  83                 return 0;
  84
  85         if (urb->status < 0) {
  86                 print_err_status(dev, -1, urb->status);
  87                 if (urb->status == -ENOENT)
  88                         return 0;
  89         }
  90
  91         /* get buffer pointer and length */
  92         p_buffer = urb->transfer_buffer;
  93         buffer_size = urb->actual_length;
  94
  95         if (buffer_size > 0) {
  96                 bytes_parsed = 0;
  97
  98                 if (dma_q->is_partial_line) {
  99                         /* Handle the case where we were working on a partial
 100                            line */
 101                         sav_eav = dma_q->last_sav;
 102                 } else {
 103                         /* Check for a SAV/EAV overlapping the
 104                            buffer boundary */
 105
 106                         sav_eav = cx231xx_find_boundary_SAV_EAV(p_buffer,
 107                                                           dma_q->partial_buf,
 108                                                           &bytes_parsed);
 109                 }
 110
 111                 sav_eav &= 0xF0;
 112                 /* Get the first line if we have some portion of an SAV/EAV from
 113                    the last buffer or a partial line */
 114                 if (sav_eav) {
 115                         bytes_parsed += cx231xx_get_vbi_line(dev, dma_q,
 116                                 sav_eav,                       /* SAV/EAV */
 117                                 p_buffer + bytes_parsed,       /* p_buffer */
 118                                 buffer_size - bytes_parsed);   /* buffer size */
 119                 }
 120
 121                 /* Now parse data that is completely in this buffer */
 122                 dma_q->is_partial_line = 0;
 123
 124                 while (bytes_parsed < buffer_size) {
 125                         u32 bytes_used = 0;
 126
 127                         sav_eav = cx231xx_find_next_SAV_EAV(
 128                                 p_buffer + bytes_parsed,        /* p_buffer */
 129                                 buffer_size - bytes_parsed, /* buffer size */
 130                                 &bytes_used);   /* bytes used to get SAV/EAV */
 131
 132                         bytes_parsed += bytes_used;
 133
 134                         sav_eav &= 0xF0;
 135                         if (sav_eav && (bytes_parsed < buffer_size)) {
 136                                 bytes_parsed += cx231xx_get_vbi_line(dev,
 137                                         dma_q, sav_eav, /* SAV/EAV */
 138                                         p_buffer+bytes_parsed, /* p_buffer */
 139                                         buffer_size-bytes_parsed);/*buf size*/
 140                         }
 141                 }
 142
 143                 /* Save the last four bytes of the buffer so we can
 144                 check the buffer boundary condition next time */
 145                 memcpy(dma_q->partial_buf, p_buffer + buffer_size - 4, 4);
 146                 bytes_parsed = 0;
 147         }
 148
 149         return rc;
 150 }
 151
 152 /* ------------------------------------------------------------------
 153         Vbi buf operations
 154    ------------------------------------------------------------------*/
 155
 156 static int vbi_queue_setup(struct vb2_queue *vq,
 157                            unsigned int *nbuffers, unsigned int *nplanes,
 158                            unsigned int sizes[], struct device *alloc_devs[])
 159 {
 160         struct cx231xx *dev = vb2_get_drv_priv(vq);
 161         u32 height = 0;
 162
 163         height = ((dev->norm & V4L2_STD_625_50) ?
 164                   PAL_VBI_LINES : NTSC_VBI_LINES);
 165
 166         *nplanes = 1;
 167         sizes[0] = (dev->width * height * 2 * 2);
 168         return 0;
 169 }
 170
 171 /* This is called *without* dev->slock held; please keep it that way */
 172 static int vbi_buf_prepare(struct vb2_buffer *vb)
 173 {
 174         struct cx231xx *dev = vb2_get_drv_priv(vb->vb2_queue);
 175         u32 height = 0;
 176         u32 size;
 177
 178         height = ((dev->norm & V4L2_STD_625_50) ?
 179                   PAL_VBI_LINES : NTSC_VBI_LINES);
 180         size = ((dev->width << 1) * height * 2);
 181
 182         if (vb2_plane_size(vb, 0) < size)
 183                 return -EINVAL;
 184         vb2_set_plane_payload(vb, 0, size);
 185         return 0;
 186 }
 187
 188 static void vbi_buf_queue(struct vb2_buffer *vb)
 189 {
 190         struct cx231xx *dev = vb2_get_drv_priv(vb->vb2_queue);
 191         struct cx231xx_buffer *buf =
 192             container_of(vb, struct cx231xx_buffer, vb.vb2_buf);
 193         struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
 194         unsigned long flags;
 195
 196         spin_lock_irqsave(&dev->vbi_mode.slock, flags);
 197         list_add_tail(&buf->list, &vidq->active);
 198         spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
 199 }
 200
 201 static void return_all_buffers(struct cx231xx *dev,
 202                                enum vb2_buffer_state state)
 203 {
 204         struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
 205         struct cx231xx_buffer *buf, *node;
 206         unsigned long flags;
 207
 208         spin_lock_irqsave(&dev->vbi_mode.slock, flags);
 209         dev->vbi_mode.bulk_ctl.buf = NULL;
 210         list_for_each_entry_safe(buf, node, &vidq->active, list) {
 211                 list_del(&buf->list);
 212                 vb2_buffer_done(&buf->vb.vb2_buf, state);
 213         }
 214         spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
 215 }
 216
 217 static int vbi_start_streaming(struct vb2_queue *vq, unsigned int count)
 218 {
 219         struct cx231xx *dev = vb2_get_drv_priv(vq);
 220         struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
 221         int ret;
 222
 223         vidq->sequence = 0;
 224         ret = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS,
 225                                     CX231XX_NUM_VBI_BUFS,
 226                                     dev->vbi_mode.alt_max_pkt_size[0],
 227                                     cx231xx_isoc_vbi_copy);
 228         if (ret)
 229                 return_all_buffers(dev, VB2_BUF_STATE_QUEUED);
 230         return ret;
 231 }
 232
 233 static void vbi_stop_streaming(struct vb2_queue *vq)
 234 {
 235         struct cx231xx *dev = vb2_get_drv_priv(vq);
 236
 237         return_all_buffers(dev, VB2_BUF_STATE_ERROR);
 238 }
 239
 240 struct vb2_ops cx231xx_vbi_qops = {
 241         .queue_setup = vbi_queue_setup,
 242         .buf_prepare = vbi_buf_prepare,
 243         .buf_queue = vbi_buf_queue,
 244         .start_streaming = vbi_start_streaming,
 245         .stop_streaming = vbi_stop_streaming,
 246         .wait_prepare = vb2_ops_wait_prepare,
 247         .wait_finish = vb2_ops_wait_finish,
 248 };
 249
 250 /* ------------------------------------------------------------------
 251         URB control
 252    ------------------------------------------------------------------*/
 253
 254 /*
 255  * IRQ callback, called by URB callback
 256  */
 257 static void cx231xx_irq_vbi_callback(struct urb *urb)
 258 {
 259         struct cx231xx_dmaqueue *dma_q = urb->context;
 260         struct cx231xx_video_mode *vmode =
 261             container_of(dma_q, struct cx231xx_video_mode, vidq);
 262         struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
 263         unsigned long flags;
 264
 265         switch (urb->status) {
 266         case 0:         /* success */
 267         case -ETIMEDOUT:        /* NAK */
 268                 break;
 269         case -ECONNRESET:       /* kill */
 270         case -ENOENT:
 271         case -ESHUTDOWN:
 272                 return;
 273         default:                /* error */
 274                 dev_err(dev->dev,
 275                         "urb completion error %d.\n", urb->status);
 276                 break;
 277         }
 278
 279         /* Copy data from URB */
 280         spin_lock_irqsave(&dev->vbi_mode.slock, flags);
 281         dev->vbi_mode.bulk_ctl.bulk_copy(dev, urb);
 282         spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
 283
 284         /* Reset status */
 285         urb->status = 0;
 286
 287         urb->status = usb_submit_urb(urb, GFP_ATOMIC);
 288         if (urb->status) {
 289                 dev_err(dev->dev, "urb resubmit failed (error=%i)\n",
 290                         urb->status);
 291         }
 292 }
 293
 294 /*
 295  * Stop and Deallocate URBs
 296  */
 297 void cx231xx_uninit_vbi_isoc(struct cx231xx *dev)
 298 {
 299         struct urb *urb;
 300         int i;
 301
 302         dev_dbg(dev->dev, "called cx231xx_uninit_vbi_isoc\n");
 303
 304         dev->vbi_mode.bulk_ctl.nfields = -1;
 305         for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
 306                 urb = dev->vbi_mode.bulk_ctl.urb[i];
 307                 if (urb) {
 308                         if (!irqs_disabled())
 309                                 usb_kill_urb(urb);
 310                         else
 311                                 usb_unlink_urb(urb);
 312
 313                         if (dev->vbi_mode.bulk_ctl.transfer_buffer[i]) {
 314
 315                                 kfree(dev->vbi_mode.bulk_ctl.
 316                                       transfer_buffer[i]);
 317                                 dev->vbi_mode.bulk_ctl.transfer_buffer[i] =
 318                                     NULL;
 319                         }
 320                         usb_free_urb(urb);
 321                         dev->vbi_mode.bulk_ctl.urb[i] = NULL;
 322                 }
 323                 dev->vbi_mode.bulk_ctl.transfer_buffer[i] = NULL;
 324         }
 325
 326         kfree(dev->vbi_mode.bulk_ctl.urb);
 327         kfree(dev->vbi_mode.bulk_ctl.transfer_buffer);
 328
 329         dev->vbi_mode.bulk_ctl.urb = NULL;
 330         dev->vbi_mode.bulk_ctl.transfer_buffer = NULL;
 331         dev->vbi_mode.bulk_ctl.num_bufs = 0;
 332
 333         cx231xx_capture_start(dev, 0, Vbi);
 334 }
 335 EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc);
 336
 337 /*
 338  * Allocate URBs and start IRQ
 339  */
 340 int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets,
 341                           int num_bufs, int max_pkt_size,
 342                           int (*bulk_copy) (struct cx231xx *dev,
 343                                             struct urb *urb))
 344 {
 345         struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq;
 346         int i;
 347         int sb_size, pipe;
 348         struct urb *urb;
 349         int rc;
 350
 351         dev_dbg(dev->dev, "called cx231xx_vbi_isoc\n");
 352
 353         /* De-allocates all pending stuff */
 354         cx231xx_uninit_vbi_isoc(dev);
 355
 356         /* clear if any halt */
 357         usb_clear_halt(dev->udev,
 358                        usb_rcvbulkpipe(dev->udev,
 359                                        dev->vbi_mode.end_point_addr));
 360
 361         dev->vbi_mode.bulk_ctl.bulk_copy = bulk_copy;
 362         dev->vbi_mode.bulk_ctl.num_bufs = num_bufs;
 363         dma_q->pos = 0;
 364         dma_q->is_partial_line = 0;
 365         dma_q->last_sav = 0;
 366         dma_q->current_field = -1;
 367         dma_q->bytes_left_in_line = dev->width << 1;
 368         dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ?
 369                                   PAL_VBI_LINES : NTSC_VBI_LINES);
 370         dma_q->lines_completed = 0;
 371         for (i = 0; i < 8; i++)
 372                 dma_q->partial_buf[i] = 0;
 373
 374         dev->vbi_mode.bulk_ctl.urb = kcalloc(num_bufs, sizeof(void *),
 375                                              GFP_KERNEL);
 376         if (!dev->vbi_mode.bulk_ctl.urb) {
 377                 dev_err(dev->dev,
 378                         "cannot alloc memory for usb buffers\n");
 379                 return -ENOMEM;
 380         }
 381
 382         dev->vbi_mode.bulk_ctl.transfer_buffer =
 383             kcalloc(num_bufs, sizeof(void *), GFP_KERNEL);
 384         if (!dev->vbi_mode.bulk_ctl.transfer_buffer) {
 385                 dev_err(dev->dev,
 386                         "cannot allocate memory for usbtransfer\n");
 387                 kfree(dev->vbi_mode.bulk_ctl.urb);
 388                 return -ENOMEM;
 389         }
 390
 391         dev->vbi_mode.bulk_ctl.max_pkt_size = max_pkt_size;
 392         dev->vbi_mode.bulk_ctl.buf = NULL;
 393
 394         sb_size = max_packets * dev->vbi_mode.bulk_ctl.max_pkt_size;
 395
 396         /* allocate urbs and transfer buffers */
 397         for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
 398
 399                 urb = usb_alloc_urb(0, GFP_KERNEL);
 400                 if (!urb) {
 401                         cx231xx_uninit_vbi_isoc(dev);
 402                         return -ENOMEM;
 403                 }
 404                 dev->vbi_mode.bulk_ctl.urb[i] = urb;
 405                 urb->transfer_flags = 0;
 406
 407                 dev->vbi_mode.bulk_ctl.transfer_buffer[i] =
 408                     kzalloc(sb_size, GFP_KERNEL);
 409                 if (!dev->vbi_mode.bulk_ctl.transfer_buffer[i]) {
 410                         dev_err(dev->dev,
 411                                 "unable to allocate %i bytes for transfer buffer %i\n",
 412                                 sb_size, i);
 413                         cx231xx_uninit_vbi_isoc(dev);
 414                         return -ENOMEM;
 415                 }
 416
 417                 pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr);
 418                 usb_fill_bulk_urb(urb, dev->udev, pipe,
 419                                   dev->vbi_mode.bulk_ctl.transfer_buffer[i],
 420                                   sb_size, cx231xx_irq_vbi_callback, dma_q);
 421         }
 422
 423         init_waitqueue_head(&dma_q->wq);
 424
 425         /* submit urbs and enables IRQ */
 426         for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
 427                 rc = usb_submit_urb(dev->vbi_mode.bulk_ctl.urb[i], GFP_ATOMIC);
 428                 if (rc) {
 429                         dev_err(dev->dev,
 430                                 "submit of urb %i failed (error=%i)\n", i, rc);
 431                         cx231xx_uninit_vbi_isoc(dev);
 432                         return rc;
 433                 }
 434         }
 435
 436         cx231xx_capture_start(dev, 1, Vbi);
 437
 438         return 0;
 439 }
 440 EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc);
 441
 442 u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
 443                          u8 sav_eav, u8 *p_buffer, u32 buffer_size)
 444 {
 445         u32 bytes_copied = 0;
 446         int current_field = -1;
 447
 448         switch (sav_eav) {
 449
 450         case SAV_VBI_FIELD1:
 451                 current_field = 1;
 452                 break;
 453
 454         case SAV_VBI_FIELD2:
 455                 current_field = 2;
 456                 break;
 457         default:
 458                 break;
 459         }
 460
 461         if (current_field < 0)
 462                 return bytes_copied;
 463
 464         dma_q->last_sav = sav_eav;
 465
 466         bytes_copied =
 467             cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size,
 468                                   current_field);
 469
 470         return bytes_copied;
 471 }
 472
 473 /*
 474  * Announces that a buffer were filled and request the next
 475  */
 476 static inline void vbi_buffer_filled(struct cx231xx *dev,
 477                                      struct cx231xx_dmaqueue *dma_q,
 478                                      struct cx231xx_buffer *buf)
 479 {
 480         /* Advice that buffer was filled */
 481         /* dev_dbg(dev->dev, "[%p/%d] wakeup\n", buf, buf->vb.index); */
 482
 483         buf->vb.sequence = dma_q->sequence++;
 484         buf->vb.vb2_buf.timestamp = ktime_get_ns();
 485
 486         dev->vbi_mode.bulk_ctl.buf = NULL;
 487
 488         list_del(&buf->list);
 489         vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
 490 }
 491
 492 u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
 493                           u8 *p_line, u32 length, int field_number)
 494 {
 495         u32 bytes_to_copy;
 496         struct cx231xx_buffer *buf;
 497         u32 _line_size = dev->width * 2;
 498
 499         if (dma_q->current_field == -1) {
 500                 /* Just starting up */
 501                 cx231xx_reset_vbi_buffer(dev, dma_q);
 502         }
 503
 504         if (dma_q->current_field != field_number)
 505                 dma_q->lines_completed = 0;
 506
 507         /* get the buffer pointer */
 508         buf = dev->vbi_mode.bulk_ctl.buf;
 509
 510         /* Remember the field number for next time */
 511         dma_q->current_field = field_number;
 512
 513         bytes_to_copy = dma_q->bytes_left_in_line;
 514         if (bytes_to_copy > length)
 515                 bytes_to_copy = length;
 516
 517         if (dma_q->lines_completed >= dma_q->lines_per_field) {
 518                 dma_q->bytes_left_in_line -= bytes_to_copy;
 519                 dma_q->is_partial_line =
 520                     (dma_q->bytes_left_in_line == 0) ? 0 : 1;
 521                 return 0;
 522         }
 523
 524         dma_q->is_partial_line = 1;
 525
 526         /* If we don't have a buffer, just return the number of bytes we would
 527            have copied if we had a buffer. */
 528         if (!buf) {
 529                 dma_q->bytes_left_in_line -= bytes_to_copy;
 530                 dma_q->is_partial_line =
 531                     (dma_q->bytes_left_in_line == 0) ? 0 : 1;
 532                 return bytes_to_copy;
 533         }
 534
 535         /* copy the data to video buffer */
 536         cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy);
 537
 538         dma_q->pos += bytes_to_copy;
 539         dma_q->bytes_left_in_line -= bytes_to_copy;
 540
 541         if (dma_q->bytes_left_in_line == 0) {
 542
 543                 dma_q->bytes_left_in_line = _line_size;
 544                 dma_q->lines_completed++;
 545                 dma_q->is_partial_line = 0;
 546
 547                 if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) {
 548
 549                         vbi_buffer_filled(dev, dma_q, buf);
 550
 551                         dma_q->pos = 0;
 552                         dma_q->lines_completed = 0;
 553                         cx231xx_reset_vbi_buffer(dev, dma_q);
 554                 }
 555         }
 556
 557         return bytes_to_copy;
 558 }
 559
 560 /*
 561  * video-buf generic routine to get the next available buffer
 562  */
 563 static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q,
 564                                     struct cx231xx_buffer **buf)
 565 {
 566         struct cx231xx_video_mode *vmode =
 567             container_of(dma_q, struct cx231xx_video_mode, vidq);
 568         struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
 569         char *outp;
 570
 571         if (list_empty(&dma_q->active)) {
 572                 dev_err(dev->dev, "No active queue to serve\n");
 573                 dev->vbi_mode.bulk_ctl.buf = NULL;
 574                 *buf = NULL;
 575                 return;
 576         }
 577
 578         /* Get the next buffer */
 579         *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, list);
 580
 581         /* Cleans up buffer - Useful for testing for frame/URB loss */
 582         outp = vb2_plane_vaddr(&(*buf)->vb.vb2_buf, 0);
 583         memset(outp, 0, vb2_plane_size(&(*buf)->vb.vb2_buf, 0));
 584
 585         dev->vbi_mode.bulk_ctl.buf = *buf;
 586
 587         return;
 588 }
 589
 590 void cx231xx_reset_vbi_buffer(struct cx231xx *dev,
 591                               struct cx231xx_dmaqueue *dma_q)
 592 {
 593         struct cx231xx_buffer *buf;
 594
 595         buf = dev->vbi_mode.bulk_ctl.buf;
 596
 597         if (buf == NULL) {
 598                 /* first try to get the buffer */
 599                 get_next_vbi_buf(dma_q, &buf);
 600
 601                 dma_q->pos = 0;
 602                 dma_q->current_field = -1;
 603         }
 604
 605         dma_q->bytes_left_in_line = dev->width << 1;
 606         dma_q->lines_completed = 0;
 607 }
 608
 609 int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
 610                         u8 *p_buffer, u32 bytes_to_copy)
 611 {
 612         u8 *p_out_buffer = NULL;
 613         u32 current_line_bytes_copied = 0;
 614         struct cx231xx_buffer *buf;
 615         u32 _line_size = dev->width << 1;
 616         void *startwrite;
 617         int offset, lencopy;
 618
 619         buf = dev->vbi_mode.bulk_ctl.buf;
 620
 621         if (buf == NULL)
 622                 return -EINVAL;
 623
 624         p_out_buffer = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
 625
 626         if (dma_q->bytes_left_in_line != _line_size) {
 627                 current_line_bytes_copied =
 628                     _line_size - dma_q->bytes_left_in_line;
 629         }
 630
 631         offset = (dma_q->lines_completed * _line_size) +
 632                  current_line_bytes_copied;
 633
 634         if (dma_q->current_field == 2) {
 635                 /* Populate the second half of the frame */
 636                 offset += (dev->width * 2 * dma_q->lines_per_field);
 637         }
 638
 639         /* prepare destination address */
 640         startwrite = p_out_buffer + offset;
 641
 642         lencopy = dma_q->bytes_left_in_line > bytes_to_copy ?
 643                   bytes_to_copy : dma_q->bytes_left_in_line;
 644
 645         memcpy(startwrite, p_buffer, lencopy);
 646
 647         return 0;
 648 }
 649
 650 u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev,
 651                               struct cx231xx_dmaqueue *dma_q)
 652 {
 653         u32 height = 0;
 654
 655         height = ((dev->norm & V4L2_STD_625_50) ?
 656                   PAL_VBI_LINES : NTSC_VBI_LINES);
 657         if (dma_q->lines_completed == height && dma_q->current_field == 2)
 658                 return 1;
 659         else
 660                 return 0;
 661 }