drivers/media/video/cx18/cx18-streams.c

   1 /*
   2  *  cx18 init/start/stop/exit stream functions
   3  *
   4  *  Derived from ivtv-streams.c
   5  *
   6  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  21  *  02111-1307  USA
  22  */
  23
  24 #include "cx18-driver.h"
  25 #include "cx18-io.h"
  26 #include "cx18-fileops.h"
  27 #include "cx18-mailbox.h"
  28 #include "cx18-i2c.h"
  29 #include "cx18-queue.h"
  30 #include "cx18-ioctl.h"
  31 #include "cx18-streams.h"
  32 #include "cx18-cards.h"
  33 #include "cx18-scb.h"
  34 #include "cx18-av-core.h"
  35 #include "cx18-dvb.h"
  36
  37 #define CX18_DSP0_INTERRUPT_MASK        0xd0004C
  38
  39 static struct file_operations cx18_v4l2_enc_fops = {
  40         .owner = THIS_MODULE,
  41         .read = cx18_v4l2_read,
  42         .open = cx18_v4l2_open,
  43         /* FIXME change to video_ioctl2 if serialization lock can be removed */
  44         .ioctl = cx18_v4l2_ioctl,
  45         .compat_ioctl = v4l_compat_ioctl32,
  46         .release = cx18_v4l2_close,
  47         .poll = cx18_v4l2_enc_poll,
  48 };
  49
  50 /* offset from 0 to register ts v4l2 minors on */
  51 #define CX18_V4L2_ENC_TS_OFFSET   16
  52 /* offset from 0 to register pcm v4l2 minors on */
  53 #define CX18_V4L2_ENC_PCM_OFFSET  24
  54 /* offset from 0 to register yuv v4l2 minors on */
  55 #define CX18_V4L2_ENC_YUV_OFFSET  32
  56
  57 static struct {
  58         const char *name;
  59         int vfl_type;
  60         int num_offset;
  61         int dma;
  62         enum v4l2_buf_type buf_type;
  63         struct file_operations *fops;
  64 } cx18_stream_info[] = {
  65         {       /* CX18_ENC_STREAM_TYPE_MPG */
  66                 "encoder MPEG",
  67                 VFL_TYPE_GRABBER, 0,
  68                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  69                 &cx18_v4l2_enc_fops
  70         },
  71         {       /* CX18_ENC_STREAM_TYPE_TS */
  72                 "TS",
  73                 VFL_TYPE_GRABBER, -1,
  74                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  75                 &cx18_v4l2_enc_fops
  76         },
  77         {       /* CX18_ENC_STREAM_TYPE_YUV */
  78                 "encoder YUV",
  79                 VFL_TYPE_GRABBER, CX18_V4L2_ENC_YUV_OFFSET,
  80                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  81                 &cx18_v4l2_enc_fops
  82         },
  83         {       /* CX18_ENC_STREAM_TYPE_VBI */
  84                 "encoder VBI",
  85                 VFL_TYPE_VBI, 0,
  86                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VBI_CAPTURE,
  87                 &cx18_v4l2_enc_fops
  88         },
  89         {       /* CX18_ENC_STREAM_TYPE_PCM */
  90                 "encoder PCM audio",
  91                 VFL_TYPE_GRABBER, CX18_V4L2_ENC_PCM_OFFSET,
  92                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_PRIVATE,
  93                 &cx18_v4l2_enc_fops
  94         },
  95         {       /* CX18_ENC_STREAM_TYPE_IDX */
  96                 "encoder IDX",
  97                 VFL_TYPE_GRABBER, -1,
  98                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  99                 &cx18_v4l2_enc_fops
 100         },
 101         {       /* CX18_ENC_STREAM_TYPE_RAD */
 102                 "encoder radio",
 103                 VFL_TYPE_RADIO, 0,
 104                 PCI_DMA_NONE, V4L2_BUF_TYPE_PRIVATE,
 105                 &cx18_v4l2_enc_fops
 106         },
 107 };
 108
 109 static void cx18_stream_init(struct cx18 *cx, int type)
 110 {
 111         struct cx18_stream *s = &cx->streams[type];
 112         struct video_device *dev = s->v4l2dev;
 113         u32 max_size = cx->options.megabytes[type] * 1024 * 1024;
 114
 115         /* we need to keep v4l2dev, so restore it afterwards */
 116         memset(s, 0, sizeof(*s));
 117         s->v4l2dev = dev;
 118
 119         /* initialize cx18_stream fields */
 120         s->cx = cx;
 121         s->type = type;
 122         s->name = cx18_stream_info[type].name;
 123         s->handle = CX18_INVALID_TASK_HANDLE;
 124
 125         s->dma = cx18_stream_info[type].dma;
 126         s->buf_size = cx->stream_buf_size[type];
 127         if (s->buf_size)
 128                 s->buffers = max_size / s->buf_size;
 129         if (s->buffers > 63) {
 130                 /* Each stream has a maximum of 63 buffers,
 131                    ensure we do not exceed that. */
 132                 s->buffers = 63;
 133                 s->buf_size = (max_size / s->buffers) & ~0xfff;
 134         }
 135         spin_lock_init(&s->qlock);
 136         init_waitqueue_head(&s->waitq);
 137         s->id = -1;
 138         cx18_queue_init(&s->q_free);
 139         cx18_queue_init(&s->q_full);
 140         cx18_queue_init(&s->q_io);
 141 }
 142
 143 static int cx18_prep_dev(struct cx18 *cx, int type)
 144 {
 145         struct cx18_stream *s = &cx->streams[type];
 146         u32 cap = cx->v4l2_cap;
 147         int num_offset = cx18_stream_info[type].num_offset;
 148         int num = cx->num + cx18_first_minor + num_offset;
 149
 150         /* These four fields are always initialized. If v4l2dev == NULL, then
 151            this stream is not in use. In that case no other fields but these
 152            four can be used. */
 153         s->v4l2dev = NULL;
 154         s->cx = cx;
 155         s->type = type;
 156         s->name = cx18_stream_info[type].name;
 157
 158         /* Check whether the radio is supported */
 159         if (type == CX18_ENC_STREAM_TYPE_RAD && !(cap & V4L2_CAP_RADIO))
 160                 return 0;
 161
 162         /* Check whether VBI is supported */
 163         if (type == CX18_ENC_STREAM_TYPE_VBI &&
 164             !(cap & (V4L2_CAP_VBI_CAPTURE | V4L2_CAP_SLICED_VBI_CAPTURE)))
 165                 return 0;
 166
 167         /* User explicitly selected 0 buffers for these streams, so don't
 168            create them. */
 169         if (cx18_stream_info[type].dma != PCI_DMA_NONE &&
 170             cx->options.megabytes[type] == 0) {
 171                 CX18_INFO("Disabled %s device\n", cx18_stream_info[type].name);
 172                 return 0;
 173         }
 174
 175         cx18_stream_init(cx, type);
 176
 177         if (num_offset == -1)
 178                 return 0;
 179
 180         /* allocate and initialize the v4l2 video device structure */
 181         s->v4l2dev = video_device_alloc();
 182         if (s->v4l2dev == NULL) {
 183                 CX18_ERR("Couldn't allocate v4l2 video_device for %s\n",
 184                                 s->name);
 185                 return -ENOMEM;
 186         }
 187
 188         snprintf(s->v4l2dev->name, sizeof(s->v4l2dev->name), "cx18-%d",
 189                         cx->num);
 190
 191         s->v4l2dev->num = num;
 192         s->v4l2dev->parent = &cx->dev->dev;
 193         s->v4l2dev->fops = cx18_stream_info[type].fops;
 194         s->v4l2dev->release = video_device_release;
 195         s->v4l2dev->tvnorms = V4L2_STD_ALL;
 196         cx18_set_funcs(s->v4l2dev);
 197         return 0;
 198 }
 199
 200 /* Initialize v4l2 variables and register v4l2 devices */
 201 int cx18_streams_setup(struct cx18 *cx)
 202 {
 203         int type;
 204
 205         /* Setup V4L2 Devices */
 206         for (type = 0; type < CX18_MAX_STREAMS; type++) {
 207                 /* Prepare device */
 208                 if (cx18_prep_dev(cx, type))
 209                         break;
 210
 211                 /* Allocate Stream */
 212                 if (cx18_stream_alloc(&cx->streams[type]))
 213                         break;
 214         }
 215         if (type == CX18_MAX_STREAMS)
 216                 return 0;
 217
 218         /* One or more streams could not be initialized. Clean 'em all up. */
 219         cx18_streams_cleanup(cx, 0);
 220         return -ENOMEM;
 221 }
 222
 223 static int cx18_reg_dev(struct cx18 *cx, int type)
 224 {
 225         struct cx18_stream *s = &cx->streams[type];
 226         int vfl_type = cx18_stream_info[type].vfl_type;
 227         int num;
 228
 229         /* TODO: Shouldn't this be a VFL_TYPE_TRANSPORT or something?
 230          * We need a VFL_TYPE_TS defined.
 231          */
 232         if (strcmp("TS", s->name) == 0) {
 233                 /* just return if no DVB is supported */
 234                 if ((cx->card->hw_all & CX18_HW_DVB) == 0)
 235                         return 0;
 236                 if (cx18_dvb_register(s) < 0) {
 237                         CX18_ERR("DVB failed to register\n");
 238                         return -EINVAL;
 239                 }
 240         }
 241
 242         if (s->v4l2dev == NULL)
 243                 return 0;
 244
 245         num = s->v4l2dev->num;
 246         /* card number + user defined offset + device offset */
 247         if (type != CX18_ENC_STREAM_TYPE_MPG) {
 248                 struct cx18_stream *s_mpg = &cx->streams[CX18_ENC_STREAM_TYPE_MPG];
 249
 250                 if (s_mpg->v4l2dev)
 251                         num = s_mpg->v4l2dev->num + cx18_stream_info[type].num_offset;
 252         }
 253
 254         /* Register device. First try the desired minor, then any free one. */
 255         if (video_register_device(s->v4l2dev, vfl_type, num)) {
 256                 CX18_ERR("Couldn't register v4l2 device for %s kernel number %d\n",
 257                         s->name, num);
 258                 video_device_release(s->v4l2dev);
 259                 s->v4l2dev = NULL;
 260                 return -ENOMEM;
 261         }
 262         num = s->v4l2dev->num;
 263
 264         switch (vfl_type) {
 265         case VFL_TYPE_GRABBER:
 266                 CX18_INFO("Registered device video%d for %s (%d MB)\n",
 267                         num, s->name, cx->options.megabytes[type]);
 268                 break;
 269
 270         case VFL_TYPE_RADIO:
 271                 CX18_INFO("Registered device radio%d for %s\n",
 272                         num, s->name);
 273                 break;
 274
 275         case VFL_TYPE_VBI:
 276                 if (cx->options.megabytes[type])
 277                         CX18_INFO("Registered device vbi%d for %s (%d MB)\n",
 278                                 num,
 279                                 s->name, cx->options.megabytes[type]);
 280                 else
 281                         CX18_INFO("Registered device vbi%d for %s\n",
 282                                 num, s->name);
 283                 break;
 284         }
 285
 286         return 0;
 287 }
 288
 289 /* Register v4l2 devices */
 290 int cx18_streams_register(struct cx18 *cx)
 291 {
 292         int type;
 293         int err = 0;
 294
 295         /* Register V4L2 devices */
 296         for (type = 0; type < CX18_MAX_STREAMS; type++)
 297                 err |= cx18_reg_dev(cx, type);
 298
 299         if (err == 0)
 300                 return 0;
 301
 302         /* One or more streams could not be initialized. Clean 'em all up. */
 303         cx18_streams_cleanup(cx, 1);
 304         return -ENOMEM;
 305 }
 306
 307 /* Unregister v4l2 devices */
 308 void cx18_streams_cleanup(struct cx18 *cx, int unregister)
 309 {
 310         struct video_device *vdev;
 311         int type;
 312
 313         /* Teardown all streams */
 314         for (type = 0; type < CX18_MAX_STREAMS; type++) {
 315                 if (cx->streams[type].dvb.enabled) {
 316                         cx18_dvb_unregister(&cx->streams[type]);
 317                         cx->streams[type].dvb.enabled = false;
 318                 }
 319
 320                 vdev = cx->streams[type].v4l2dev;
 321
 322                 cx->streams[type].v4l2dev = NULL;
 323                 if (vdev == NULL)
 324                         continue;
 325
 326                 cx18_stream_free(&cx->streams[type]);
 327
 328                 /* Unregister or release device */
 329                 if (unregister)
 330                         video_unregister_device(vdev);
 331                 else
 332                         video_device_release(vdev);
 333         }
 334 }
 335
 336 static void cx18_vbi_setup(struct cx18_stream *s)
 337 {
 338         struct cx18 *cx = s->cx;
 339         int raw = cx->vbi.sliced_in->service_set == 0;
 340         u32 data[CX2341X_MBOX_MAX_DATA];
 341         int lines;
 342
 343         if (cx->is_60hz) {
 344                 cx->vbi.count = 12;
 345                 cx->vbi.start[0] = 10;
 346                 cx->vbi.start[1] = 273;
 347         } else {        /* PAL/SECAM */
 348                 cx->vbi.count = 18;
 349                 cx->vbi.start[0] = 6;
 350                 cx->vbi.start[1] = 318;
 351         }
 352
 353         /* setup VBI registers */
 354         cx18_av_cmd(cx, VIDIOC_S_FMT, &cx->vbi.in);
 355
 356         /* determine number of lines and total number of VBI bytes.
 357            A raw line takes 1443 bytes: 2 * 720 + 4 byte frame header - 1
 358            The '- 1' byte is probably an unused U or V byte. Or something...
 359            A sliced line takes 51 bytes: 4 byte frame header, 4 byte internal
 360            header, 42 data bytes + checksum (to be confirmed) */
 361         if (raw) {
 362                 lines = cx->vbi.count * 2;
 363         } else {
 364                 lines = cx->is_60hz ? 24 : 38;
 365                 if (cx->is_60hz)
 366                         lines += 2;
 367         }
 368
 369         cx->vbi.enc_size = lines *
 370                 (raw ? cx->vbi.raw_size : cx->vbi.sliced_size);
 371
 372         data[0] = s->handle;
 373         /* Lines per field */
 374         data[1] = (lines / 2) | ((lines / 2) << 16);
 375         /* bytes per line */
 376         data[2] = (raw ? cx->vbi.raw_size : cx->vbi.sliced_size);
 377         /* Every X number of frames a VBI interrupt arrives
 378            (frames as in 25 or 30 fps) */
 379         data[3] = 1;
 380         /* Setup VBI for the cx25840 digitizer */
 381         if (raw) {
 382                 data[4] = 0x20602060;
 383                 data[5] = 0x30703070;
 384         } else {
 385                 data[4] = 0xB0F0B0F0;
 386                 data[5] = 0xA0E0A0E0;
 387         }
 388
 389         CX18_DEBUG_INFO("Setup VBI h: %d lines %x bpl %d fr %d %x %x\n",
 390                         data[0], data[1], data[2], data[3], data[4], data[5]);
 391
 392         if (s->type == CX18_ENC_STREAM_TYPE_VBI)
 393                 cx18_api(cx, CX18_CPU_SET_RAW_VBI_PARAM, 6, data);
 394 }
 395
 396 int cx18_start_v4l2_encode_stream(struct cx18_stream *s)
 397 {
 398         u32 data[MAX_MB_ARGUMENTS];
 399         struct cx18 *cx = s->cx;
 400         struct list_head *p;
 401         int ts = 0;
 402         int captype = 0;
 403
 404         if (s->v4l2dev == NULL && s->dvb.enabled == 0)
 405                 return -EINVAL;
 406
 407         CX18_DEBUG_INFO("Start encoder stream %s\n", s->name);
 408
 409         switch (s->type) {
 410         case CX18_ENC_STREAM_TYPE_MPG:
 411                 captype = CAPTURE_CHANNEL_TYPE_MPEG;
 412                 cx->mpg_data_received = cx->vbi_data_inserted = 0;
 413                 cx->dualwatch_jiffies = jiffies;
 414                 cx->dualwatch_stereo_mode = cx->params.audio_properties & 0x300;
 415                 cx->search_pack_header = 0;
 416                 break;
 417
 418         case CX18_ENC_STREAM_TYPE_TS:
 419                 captype = CAPTURE_CHANNEL_TYPE_TS;
 420                 ts = 1;
 421                 break;
 422         case CX18_ENC_STREAM_TYPE_YUV:
 423                 captype = CAPTURE_CHANNEL_TYPE_YUV;
 424                 break;
 425         case CX18_ENC_STREAM_TYPE_PCM:
 426                 captype = CAPTURE_CHANNEL_TYPE_PCM;
 427                 break;
 428         case CX18_ENC_STREAM_TYPE_VBI:
 429                 captype = cx->vbi.sliced_in->service_set ?
 430                     CAPTURE_CHANNEL_TYPE_SLICED_VBI : CAPTURE_CHANNEL_TYPE_VBI;
 431                 cx->vbi.frame = 0;
 432                 cx->vbi.inserted_frame = 0;
 433                 memset(cx->vbi.sliced_mpeg_size,
 434                         0, sizeof(cx->vbi.sliced_mpeg_size));
 435                 break;
 436         default:
 437                 return -EINVAL;
 438         }
 439
 440         /* mute/unmute video */
 441         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2,
 442                   s->handle, !!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags));
 443
 444         /* Clear Streamoff flags in case left from last capture */
 445         clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 446
 447         cx18_vapi_result(cx, data, CX18_CREATE_TASK, 1, CPU_CMD_MASK_CAPTURE);
 448         s->handle = data[0];
 449         cx18_vapi(cx, CX18_CPU_SET_CHANNEL_TYPE, 2, s->handle, captype);
 450
 451         if (atomic_read(&cx->ana_capturing) == 0 && !ts) {
 452                 /* Stuff from Windows, we don't know what it is */
 453                 cx18_vapi(cx, CX18_CPU_SET_VER_CROP_LINE, 2, s->handle, 0);
 454                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 3, 1);
 455                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 8, 0);
 456                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 4, 1);
 457                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, s->handle, 12);
 458
 459                 cx18_vapi(cx, CX18_CPU_SET_CAPTURE_LINE_NO, 3,
 460                                s->handle, cx->digitizer, cx->digitizer);
 461
 462                 /* Setup VBI */
 463                 if (cx->v4l2_cap & V4L2_CAP_VBI_CAPTURE)
 464                         cx18_vbi_setup(s);
 465
 466                 /* assign program index info.
 467                    Mask 7: select I/P/B, Num_req: 400 max */
 468                 cx18_vapi_result(cx, data, CX18_CPU_SET_INDEXTABLE, 1, 0);
 469
 470                 /* Setup API for Stream */
 471                 cx2341x_update(cx, cx18_api_func, NULL, &cx->params);
 472         }
 473
 474         if (atomic_read(&cx->tot_capturing) == 0) {
 475                 clear_bit(CX18_F_I_EOS, &cx->i_flags);
 476                 cx18_write_reg(cx, 7, CX18_DSP0_INTERRUPT_MASK);
 477         }
 478
 479         cx18_vapi(cx, CX18_CPU_DE_SET_MDL_ACK, 3, s->handle,
 480                 (void __iomem *)&cx->scb->cpu_mdl_ack[s->type][0] - cx->enc_mem,
 481                 (void __iomem *)&cx->scb->cpu_mdl_ack[s->type][1] - cx->enc_mem);
 482
 483         list_for_each(p, &s->q_free.list) {
 484                 struct cx18_buffer *buf = list_entry(p, struct cx18_buffer, list);
 485
 486                 cx18_writel(cx, buf->dma_handle,
 487                                         &cx->scb->cpu_mdl[buf->id].paddr);
 488                 cx18_writel(cx, s->buf_size, &cx->scb->cpu_mdl[buf->id].length);
 489                 cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5, s->handle,
 490                         (void __iomem *)&cx->scb->cpu_mdl[buf->id] - cx->enc_mem,
 491                         1, buf->id, s->buf_size);
 492         }
 493         /* begin_capture */
 494         if (cx18_vapi(cx, CX18_CPU_CAPTURE_START, 1, s->handle)) {
 495                 CX18_DEBUG_WARN("Error starting capture!\n");
 496                 /* Ensure we're really not capturing before releasing MDLs */
 497                 if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 498                         cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 2, s->handle, 1);
 499                 else
 500                         cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 1, s->handle);
 501                 cx18_vapi(cx, CX18_CPU_DE_RELEASE_MDL, 1, s->handle);
 502                 cx18_vapi(cx, CX18_DESTROY_TASK, 1, s->handle);
 503                 /* FIXME - clean-up DSP0_INT mask, i_flags, s_flags, etc. */
 504                 return -EINVAL;
 505         }
 506
 507         /* you're live! sit back and await interrupts :) */
 508         if (!ts)
 509                 atomic_inc(&cx->ana_capturing);
 510         atomic_inc(&cx->tot_capturing);
 511         return 0;
 512 }
 513
 514 void cx18_stop_all_captures(struct cx18 *cx)
 515 {
 516         int i;
 517
 518         for (i = CX18_MAX_STREAMS - 1; i >= 0; i--) {
 519                 struct cx18_stream *s = &cx->streams[i];
 520
 521                 if (s->v4l2dev == NULL && s->dvb.enabled == 0)
 522                         continue;
 523                 if (test_bit(CX18_F_S_STREAMING, &s->s_flags))
 524                         cx18_stop_v4l2_encode_stream(s, 0);
 525         }
 526 }
 527
 528 int cx18_stop_v4l2_encode_stream(struct cx18_stream *s, int gop_end)
 529 {
 530         struct cx18 *cx = s->cx;
 531         unsigned long then;
 532
 533         if (s->v4l2dev == NULL && s->dvb.enabled == 0)
 534                 return -EINVAL;
 535
 536         /* This function assumes that you are allowed to stop the capture
 537            and that we are actually capturing */
 538
 539         CX18_DEBUG_INFO("Stop Capture\n");
 540
 541         if (atomic_read(&cx->tot_capturing) == 0)
 542                 return 0;
 543
 544         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 545                 cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 2, s->handle, !gop_end);
 546         else
 547                 cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 1, s->handle);
 548
 549         then = jiffies;
 550
 551         if (s->type == CX18_ENC_STREAM_TYPE_MPG && gop_end) {
 552                 CX18_INFO("ignoring gop_end: not (yet?) supported by the firmware\n");
 553         }
 554
 555         /* Tell the CX23418 it can't use our buffers anymore */
 556         cx18_vapi(cx, CX18_CPU_DE_RELEASE_MDL, 1, s->handle);
 557
 558         if (s->type != CX18_ENC_STREAM_TYPE_TS)
 559                 atomic_dec(&cx->ana_capturing);
 560         atomic_dec(&cx->tot_capturing);
 561
 562         /* Clear capture and no-read bits */
 563         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 564
 565         cx18_vapi(cx, CX18_DESTROY_TASK, 1, s->handle);
 566         s->handle = CX18_INVALID_TASK_HANDLE;
 567
 568         if (atomic_read(&cx->tot_capturing) > 0)
 569                 return 0;
 570
 571         cx18_write_reg(cx, 5, CX18_DSP0_INTERRUPT_MASK);
 572         wake_up(&s->waitq);
 573
 574         return 0;
 575 }
 576
 577 u32 cx18_find_handle(struct cx18 *cx)
 578 {
 579         int i;
 580
 581         /* find first available handle to be used for global settings */
 582         for (i = 0; i < CX18_MAX_STREAMS; i++) {
 583                 struct cx18_stream *s = &cx->streams[i];
 584
 585                 if (s->v4l2dev && (s->handle != CX18_INVALID_TASK_HANDLE))
 586                         return s->handle;
 587         }
 588         return CX18_INVALID_TASK_HANDLE;
 589 }